config.con commit Merge branch 'sp/stream-clean-filter' (f0d8900)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12#include "hashmap.h"
  13#include "string-list.h"
  14
  15struct config_source {
  16        struct config_source *prev;
  17        union {
  18                FILE *file;
  19                struct config_buf {
  20                        const char *buf;
  21                        size_t len;
  22                        size_t pos;
  23                } buf;
  24        } u;
  25        const char *name;
  26        const char *path;
  27        int die_on_error;
  28        int linenr;
  29        int eof;
  30        struct strbuf value;
  31        struct strbuf var;
  32
  33        int (*do_fgetc)(struct config_source *c);
  34        int (*do_ungetc)(int c, struct config_source *conf);
  35        long (*do_ftell)(struct config_source *c);
  36};
  37
  38static struct config_source *cf;
  39
  40static int zlib_compression_seen;
  41
  42/*
  43 * Default config_set that contains key-value pairs from the usual set of config
  44 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  45 * config file and the global /etc/gitconfig)
  46 */
  47static struct config_set the_config_set;
  48
  49static int config_file_fgetc(struct config_source *conf)
  50{
  51        return fgetc(conf->u.file);
  52}
  53
  54static int config_file_ungetc(int c, struct config_source *conf)
  55{
  56        return ungetc(c, conf->u.file);
  57}
  58
  59static long config_file_ftell(struct config_source *conf)
  60{
  61        return ftell(conf->u.file);
  62}
  63
  64
  65static int config_buf_fgetc(struct config_source *conf)
  66{
  67        if (conf->u.buf.pos < conf->u.buf.len)
  68                return conf->u.buf.buf[conf->u.buf.pos++];
  69
  70        return EOF;
  71}
  72
  73static int config_buf_ungetc(int c, struct config_source *conf)
  74{
  75        if (conf->u.buf.pos > 0)
  76                return conf->u.buf.buf[--conf->u.buf.pos];
  77
  78        return EOF;
  79}
  80
  81static long config_buf_ftell(struct config_source *conf)
  82{
  83        return conf->u.buf.pos;
  84}
  85
  86#define MAX_INCLUDE_DEPTH 10
  87static const char include_depth_advice[] =
  88"exceeded maximum include depth (%d) while including\n"
  89"       %s\n"
  90"from\n"
  91"       %s\n"
  92"Do you have circular includes?";
  93static int handle_path_include(const char *path, struct config_include_data *inc)
  94{
  95        int ret = 0;
  96        struct strbuf buf = STRBUF_INIT;
  97        char *expanded;
  98
  99        if (!path)
 100                return config_error_nonbool("include.path");
 101
 102        expanded = expand_user_path(path);
 103        if (!expanded)
 104                return error("Could not expand include path '%s'", path);
 105        path = expanded;
 106
 107        /*
 108         * Use an absolute path as-is, but interpret relative paths
 109         * based on the including config file.
 110         */
 111        if (!is_absolute_path(path)) {
 112                char *slash;
 113
 114                if (!cf || !cf->path)
 115                        return error("relative config includes must come from files");
 116
 117                slash = find_last_dir_sep(cf->path);
 118                if (slash)
 119                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 120                strbuf_addstr(&buf, path);
 121                path = buf.buf;
 122        }
 123
 124        if (!access_or_die(path, R_OK, 0)) {
 125                if (++inc->depth > MAX_INCLUDE_DEPTH)
 126                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 127                            cf && cf->name ? cf->name : "the command line");
 128                ret = git_config_from_file(git_config_include, path, inc);
 129                inc->depth--;
 130        }
 131        strbuf_release(&buf);
 132        free(expanded);
 133        return ret;
 134}
 135
 136int git_config_include(const char *var, const char *value, void *data)
 137{
 138        struct config_include_data *inc = data;
 139        int ret;
 140
 141        /*
 142         * Pass along all values, including "include" directives; this makes it
 143         * possible to query information on the includes themselves.
 144         */
 145        ret = inc->fn(var, value, inc->data);
 146        if (ret < 0)
 147                return ret;
 148
 149        if (!strcmp(var, "include.path"))
 150                ret = handle_path_include(value, inc);
 151        return ret;
 152}
 153
 154void git_config_push_parameter(const char *text)
 155{
 156        struct strbuf env = STRBUF_INIT;
 157        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 158        if (old) {
 159                strbuf_addstr(&env, old);
 160                strbuf_addch(&env, ' ');
 161        }
 162        sq_quote_buf(&env, text);
 163        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 164        strbuf_release(&env);
 165}
 166
 167int git_config_parse_parameter(const char *text,
 168                               config_fn_t fn, void *data)
 169{
 170        const char *value;
 171        struct strbuf **pair;
 172
 173        pair = strbuf_split_str(text, '=', 2);
 174        if (!pair[0])
 175                return error("bogus config parameter: %s", text);
 176
 177        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 178                strbuf_setlen(pair[0], pair[0]->len - 1);
 179                value = pair[1] ? pair[1]->buf : "";
 180        } else {
 181                value = NULL;
 182        }
 183
 184        strbuf_trim(pair[0]);
 185        if (!pair[0]->len) {
 186                strbuf_list_free(pair);
 187                return error("bogus config parameter: %s", text);
 188        }
 189        strbuf_tolower(pair[0]);
 190        if (fn(pair[0]->buf, value, data) < 0) {
 191                strbuf_list_free(pair);
 192                return -1;
 193        }
 194        strbuf_list_free(pair);
 195        return 0;
 196}
 197
 198int git_config_from_parameters(config_fn_t fn, void *data)
 199{
 200        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 201        char *envw;
 202        const char **argv = NULL;
 203        int nr = 0, alloc = 0;
 204        int i;
 205
 206        if (!env)
 207                return 0;
 208        /* sq_dequote will write over it */
 209        envw = xstrdup(env);
 210
 211        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 212                free(envw);
 213                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 214        }
 215
 216        for (i = 0; i < nr; i++) {
 217                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 218                        free(argv);
 219                        free(envw);
 220                        return -1;
 221                }
 222        }
 223
 224        free(argv);
 225        free(envw);
 226        return nr > 0;
 227}
 228
 229static int get_next_char(void)
 230{
 231        int c = cf->do_fgetc(cf);
 232
 233        if (c == '\r') {
 234                /* DOS like systems */
 235                c = cf->do_fgetc(cf);
 236                if (c != '\n') {
 237                        cf->do_ungetc(c, cf);
 238                        c = '\r';
 239                }
 240        }
 241        if (c == '\n')
 242                cf->linenr++;
 243        if (c == EOF) {
 244                cf->eof = 1;
 245                cf->linenr++;
 246                c = '\n';
 247        }
 248        return c;
 249}
 250
 251static char *parse_value(void)
 252{
 253        int quote = 0, comment = 0, space = 0;
 254
 255        strbuf_reset(&cf->value);
 256        for (;;) {
 257                int c = get_next_char();
 258                if (c == '\n') {
 259                        if (quote) {
 260                                cf->linenr--;
 261                                return NULL;
 262                        }
 263                        return cf->value.buf;
 264                }
 265                if (comment)
 266                        continue;
 267                if (isspace(c) && !quote) {
 268                        if (cf->value.len)
 269                                space++;
 270                        continue;
 271                }
 272                if (!quote) {
 273                        if (c == ';' || c == '#') {
 274                                comment = 1;
 275                                continue;
 276                        }
 277                }
 278                for (; space; space--)
 279                        strbuf_addch(&cf->value, ' ');
 280                if (c == '\\') {
 281                        c = get_next_char();
 282                        switch (c) {
 283                        case '\n':
 284                                continue;
 285                        case 't':
 286                                c = '\t';
 287                                break;
 288                        case 'b':
 289                                c = '\b';
 290                                break;
 291                        case 'n':
 292                                c = '\n';
 293                                break;
 294                        /* Some characters escape as themselves */
 295                        case '\\': case '"':
 296                                break;
 297                        /* Reject unknown escape sequences */
 298                        default:
 299                                return NULL;
 300                        }
 301                        strbuf_addch(&cf->value, c);
 302                        continue;
 303                }
 304                if (c == '"') {
 305                        quote = 1-quote;
 306                        continue;
 307                }
 308                strbuf_addch(&cf->value, c);
 309        }
 310}
 311
 312static inline int iskeychar(int c)
 313{
 314        return isalnum(c) || c == '-';
 315}
 316
 317static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 318{
 319        int c;
 320        char *value;
 321        int ret;
 322
 323        /* Get the full name */
 324        for (;;) {
 325                c = get_next_char();
 326                if (cf->eof)
 327                        break;
 328                if (!iskeychar(c))
 329                        break;
 330                strbuf_addch(name, tolower(c));
 331        }
 332
 333        while (c == ' ' || c == '\t')
 334                c = get_next_char();
 335
 336        value = NULL;
 337        if (c != '\n') {
 338                if (c != '=')
 339                        return -1;
 340                value = parse_value();
 341                if (!value)
 342                        return -1;
 343        }
 344        /*
 345         * We already consumed the \n, but we need linenr to point to
 346         * the line we just parsed during the call to fn to get
 347         * accurate line number in error messages.
 348         */
 349        cf->linenr--;
 350        ret = fn(name->buf, value, data);
 351        cf->linenr++;
 352        return ret;
 353}
 354
 355static int get_extended_base_var(struct strbuf *name, int c)
 356{
 357        do {
 358                if (c == '\n')
 359                        goto error_incomplete_line;
 360                c = get_next_char();
 361        } while (isspace(c));
 362
 363        /* We require the format to be '[base "extension"]' */
 364        if (c != '"')
 365                return -1;
 366        strbuf_addch(name, '.');
 367
 368        for (;;) {
 369                int c = get_next_char();
 370                if (c == '\n')
 371                        goto error_incomplete_line;
 372                if (c == '"')
 373                        break;
 374                if (c == '\\') {
 375                        c = get_next_char();
 376                        if (c == '\n')
 377                                goto error_incomplete_line;
 378                }
 379                strbuf_addch(name, c);
 380        }
 381
 382        /* Final ']' */
 383        if (get_next_char() != ']')
 384                return -1;
 385        return 0;
 386error_incomplete_line:
 387        cf->linenr--;
 388        return -1;
 389}
 390
 391static int get_base_var(struct strbuf *name)
 392{
 393        for (;;) {
 394                int c = get_next_char();
 395                if (cf->eof)
 396                        return -1;
 397                if (c == ']')
 398                        return 0;
 399                if (isspace(c))
 400                        return get_extended_base_var(name, c);
 401                if (!iskeychar(c) && c != '.')
 402                        return -1;
 403                strbuf_addch(name, tolower(c));
 404        }
 405}
 406
 407static int git_parse_source(config_fn_t fn, void *data)
 408{
 409        int comment = 0;
 410        int baselen = 0;
 411        struct strbuf *var = &cf->var;
 412
 413        /* U+FEFF Byte Order Mark in UTF8 */
 414        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 415        const unsigned char *bomptr = utf8_bom;
 416
 417        for (;;) {
 418                int c = get_next_char();
 419                if (bomptr && *bomptr) {
 420                        /* We are at the file beginning; skip UTF8-encoded BOM
 421                         * if present. Sane editors won't put this in on their
 422                         * own, but e.g. Windows Notepad will do it happily. */
 423                        if ((unsigned char) c == *bomptr) {
 424                                bomptr++;
 425                                continue;
 426                        } else {
 427                                /* Do not tolerate partial BOM. */
 428                                if (bomptr != utf8_bom)
 429                                        break;
 430                                /* No BOM at file beginning. Cool. */
 431                                bomptr = NULL;
 432                        }
 433                }
 434                if (c == '\n') {
 435                        if (cf->eof)
 436                                return 0;
 437                        comment = 0;
 438                        continue;
 439                }
 440                if (comment || isspace(c))
 441                        continue;
 442                if (c == '#' || c == ';') {
 443                        comment = 1;
 444                        continue;
 445                }
 446                if (c == '[') {
 447                        /* Reset prior to determining a new stem */
 448                        strbuf_reset(var);
 449                        if (get_base_var(var) < 0 || var->len < 1)
 450                                break;
 451                        strbuf_addch(var, '.');
 452                        baselen = var->len;
 453                        continue;
 454                }
 455                if (!isalpha(c))
 456                        break;
 457                /*
 458                 * Truncate the var name back to the section header
 459                 * stem prior to grabbing the suffix part of the name
 460                 * and the value.
 461                 */
 462                strbuf_setlen(var, baselen);
 463                strbuf_addch(var, tolower(c));
 464                if (get_value(fn, data, var) < 0)
 465                        break;
 466        }
 467        if (cf->die_on_error)
 468                die(_("bad config file line %d in %s"), cf->linenr, cf->name);
 469        else
 470                return error(_("bad config file line %d in %s"), cf->linenr, cf->name);
 471}
 472
 473static int parse_unit_factor(const char *end, uintmax_t *val)
 474{
 475        if (!*end)
 476                return 1;
 477        else if (!strcasecmp(end, "k")) {
 478                *val *= 1024;
 479                return 1;
 480        }
 481        else if (!strcasecmp(end, "m")) {
 482                *val *= 1024 * 1024;
 483                return 1;
 484        }
 485        else if (!strcasecmp(end, "g")) {
 486                *val *= 1024 * 1024 * 1024;
 487                return 1;
 488        }
 489        return 0;
 490}
 491
 492static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 493{
 494        if (value && *value) {
 495                char *end;
 496                intmax_t val;
 497                uintmax_t uval;
 498                uintmax_t factor = 1;
 499
 500                errno = 0;
 501                val = strtoimax(value, &end, 0);
 502                if (errno == ERANGE)
 503                        return 0;
 504                if (!parse_unit_factor(end, &factor)) {
 505                        errno = EINVAL;
 506                        return 0;
 507                }
 508                uval = abs(val);
 509                uval *= factor;
 510                if (uval > max || abs(val) > uval) {
 511                        errno = ERANGE;
 512                        return 0;
 513                }
 514                val *= factor;
 515                *ret = val;
 516                return 1;
 517        }
 518        errno = EINVAL;
 519        return 0;
 520}
 521
 522static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 523{
 524        if (value && *value) {
 525                char *end;
 526                uintmax_t val;
 527                uintmax_t oldval;
 528
 529                errno = 0;
 530                val = strtoumax(value, &end, 0);
 531                if (errno == ERANGE)
 532                        return 0;
 533                oldval = val;
 534                if (!parse_unit_factor(end, &val)) {
 535                        errno = EINVAL;
 536                        return 0;
 537                }
 538                if (val > max || oldval > val) {
 539                        errno = ERANGE;
 540                        return 0;
 541                }
 542                *ret = val;
 543                return 1;
 544        }
 545        errno = EINVAL;
 546        return 0;
 547}
 548
 549static int git_parse_int(const char *value, int *ret)
 550{
 551        intmax_t tmp;
 552        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 553                return 0;
 554        *ret = tmp;
 555        return 1;
 556}
 557
 558static int git_parse_int64(const char *value, int64_t *ret)
 559{
 560        intmax_t tmp;
 561        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 562                return 0;
 563        *ret = tmp;
 564        return 1;
 565}
 566
 567int git_parse_ulong(const char *value, unsigned long *ret)
 568{
 569        uintmax_t tmp;
 570        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 571                return 0;
 572        *ret = tmp;
 573        return 1;
 574}
 575
 576NORETURN
 577static void die_bad_number(const char *name, const char *value)
 578{
 579        const char *reason = errno == ERANGE ?
 580                             "out of range" :
 581                             "invalid unit";
 582        if (!value)
 583                value = "";
 584
 585        if (cf && cf->name)
 586                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 587                    value, name, cf->name, reason);
 588        die(_("bad numeric config value '%s' for '%s': %s"), value, name, reason);
 589}
 590
 591int git_config_int(const char *name, const char *value)
 592{
 593        int ret;
 594        if (!git_parse_int(value, &ret))
 595                die_bad_number(name, value);
 596        return ret;
 597}
 598
 599int64_t git_config_int64(const char *name, const char *value)
 600{
 601        int64_t ret;
 602        if (!git_parse_int64(value, &ret))
 603                die_bad_number(name, value);
 604        return ret;
 605}
 606
 607unsigned long git_config_ulong(const char *name, const char *value)
 608{
 609        unsigned long ret;
 610        if (!git_parse_ulong(value, &ret))
 611                die_bad_number(name, value);
 612        return ret;
 613}
 614
 615static int git_config_maybe_bool_text(const char *name, const char *value)
 616{
 617        if (!value)
 618                return 1;
 619        if (!*value)
 620                return 0;
 621        if (!strcasecmp(value, "true")
 622            || !strcasecmp(value, "yes")
 623            || !strcasecmp(value, "on"))
 624                return 1;
 625        if (!strcasecmp(value, "false")
 626            || !strcasecmp(value, "no")
 627            || !strcasecmp(value, "off"))
 628                return 0;
 629        return -1;
 630}
 631
 632int git_config_maybe_bool(const char *name, const char *value)
 633{
 634        int v = git_config_maybe_bool_text(name, value);
 635        if (0 <= v)
 636                return v;
 637        if (git_parse_int(value, &v))
 638                return !!v;
 639        return -1;
 640}
 641
 642int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 643{
 644        int v = git_config_maybe_bool_text(name, value);
 645        if (0 <= v) {
 646                *is_bool = 1;
 647                return v;
 648        }
 649        *is_bool = 0;
 650        return git_config_int(name, value);
 651}
 652
 653int git_config_bool(const char *name, const char *value)
 654{
 655        int discard;
 656        return !!git_config_bool_or_int(name, value, &discard);
 657}
 658
 659int git_config_string(const char **dest, const char *var, const char *value)
 660{
 661        if (!value)
 662                return config_error_nonbool(var);
 663        *dest = xstrdup(value);
 664        return 0;
 665}
 666
 667int git_config_pathname(const char **dest, const char *var, const char *value)
 668{
 669        if (!value)
 670                return config_error_nonbool(var);
 671        *dest = expand_user_path(value);
 672        if (!*dest)
 673                die(_("failed to expand user dir in: '%s'"), value);
 674        return 0;
 675}
 676
 677static int git_default_core_config(const char *var, const char *value)
 678{
 679        /* This needs a better name */
 680        if (!strcmp(var, "core.filemode")) {
 681                trust_executable_bit = git_config_bool(var, value);
 682                return 0;
 683        }
 684        if (!strcmp(var, "core.trustctime")) {
 685                trust_ctime = git_config_bool(var, value);
 686                return 0;
 687        }
 688        if (!strcmp(var, "core.checkstat")) {
 689                if (!strcasecmp(value, "default"))
 690                        check_stat = 1;
 691                else if (!strcasecmp(value, "minimal"))
 692                        check_stat = 0;
 693        }
 694
 695        if (!strcmp(var, "core.quotepath")) {
 696                quote_path_fully = git_config_bool(var, value);
 697                return 0;
 698        }
 699
 700        if (!strcmp(var, "core.symlinks")) {
 701                has_symlinks = git_config_bool(var, value);
 702                return 0;
 703        }
 704
 705        if (!strcmp(var, "core.ignorecase")) {
 706                ignore_case = git_config_bool(var, value);
 707                return 0;
 708        }
 709
 710        if (!strcmp(var, "core.attributesfile"))
 711                return git_config_pathname(&git_attributes_file, var, value);
 712
 713        if (!strcmp(var, "core.bare")) {
 714                is_bare_repository_cfg = git_config_bool(var, value);
 715                return 0;
 716        }
 717
 718        if (!strcmp(var, "core.ignorestat")) {
 719                assume_unchanged = git_config_bool(var, value);
 720                return 0;
 721        }
 722
 723        if (!strcmp(var, "core.prefersymlinkrefs")) {
 724                prefer_symlink_refs = git_config_bool(var, value);
 725                return 0;
 726        }
 727
 728        if (!strcmp(var, "core.logallrefupdates")) {
 729                log_all_ref_updates = git_config_bool(var, value);
 730                return 0;
 731        }
 732
 733        if (!strcmp(var, "core.warnambiguousrefs")) {
 734                warn_ambiguous_refs = git_config_bool(var, value);
 735                return 0;
 736        }
 737
 738        if (!strcmp(var, "core.abbrev")) {
 739                int abbrev = git_config_int(var, value);
 740                if (abbrev < minimum_abbrev || abbrev > 40)
 741                        return -1;
 742                default_abbrev = abbrev;
 743                return 0;
 744        }
 745
 746        if (!strcmp(var, "core.loosecompression")) {
 747                int level = git_config_int(var, value);
 748                if (level == -1)
 749                        level = Z_DEFAULT_COMPRESSION;
 750                else if (level < 0 || level > Z_BEST_COMPRESSION)
 751                        die(_("bad zlib compression level %d"), level);
 752                zlib_compression_level = level;
 753                zlib_compression_seen = 1;
 754                return 0;
 755        }
 756
 757        if (!strcmp(var, "core.compression")) {
 758                int level = git_config_int(var, value);
 759                if (level == -1)
 760                        level = Z_DEFAULT_COMPRESSION;
 761                else if (level < 0 || level > Z_BEST_COMPRESSION)
 762                        die(_("bad zlib compression level %d"), level);
 763                core_compression_level = level;
 764                core_compression_seen = 1;
 765                if (!zlib_compression_seen)
 766                        zlib_compression_level = level;
 767                return 0;
 768        }
 769
 770        if (!strcmp(var, "core.packedgitwindowsize")) {
 771                int pgsz_x2 = getpagesize() * 2;
 772                packed_git_window_size = git_config_ulong(var, value);
 773
 774                /* This value must be multiple of (pagesize * 2) */
 775                packed_git_window_size /= pgsz_x2;
 776                if (packed_git_window_size < 1)
 777                        packed_git_window_size = 1;
 778                packed_git_window_size *= pgsz_x2;
 779                return 0;
 780        }
 781
 782        if (!strcmp(var, "core.bigfilethreshold")) {
 783                big_file_threshold = git_config_ulong(var, value);
 784                return 0;
 785        }
 786
 787        if (!strcmp(var, "core.packedgitlimit")) {
 788                packed_git_limit = git_config_ulong(var, value);
 789                return 0;
 790        }
 791
 792        if (!strcmp(var, "core.deltabasecachelimit")) {
 793                delta_base_cache_limit = git_config_ulong(var, value);
 794                return 0;
 795        }
 796
 797        if (!strcmp(var, "core.autocrlf")) {
 798                if (value && !strcasecmp(value, "input")) {
 799                        if (core_eol == EOL_CRLF)
 800                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 801                        auto_crlf = AUTO_CRLF_INPUT;
 802                        return 0;
 803                }
 804                auto_crlf = git_config_bool(var, value);
 805                return 0;
 806        }
 807
 808        if (!strcmp(var, "core.safecrlf")) {
 809                if (value && !strcasecmp(value, "warn")) {
 810                        safe_crlf = SAFE_CRLF_WARN;
 811                        return 0;
 812                }
 813                safe_crlf = git_config_bool(var, value);
 814                return 0;
 815        }
 816
 817        if (!strcmp(var, "core.eol")) {
 818                if (value && !strcasecmp(value, "lf"))
 819                        core_eol = EOL_LF;
 820                else if (value && !strcasecmp(value, "crlf"))
 821                        core_eol = EOL_CRLF;
 822                else if (value && !strcasecmp(value, "native"))
 823                        core_eol = EOL_NATIVE;
 824                else
 825                        core_eol = EOL_UNSET;
 826                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 827                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 828                return 0;
 829        }
 830
 831        if (!strcmp(var, "core.notesref")) {
 832                notes_ref_name = xstrdup(value);
 833                return 0;
 834        }
 835
 836        if (!strcmp(var, "core.pager"))
 837                return git_config_string(&pager_program, var, value);
 838
 839        if (!strcmp(var, "core.editor"))
 840                return git_config_string(&editor_program, var, value);
 841
 842        if (!strcmp(var, "core.commentchar")) {
 843                if (!value)
 844                        return config_error_nonbool(var);
 845                else if (!strcasecmp(value, "auto"))
 846                        auto_comment_line_char = 1;
 847                else if (value[0] && !value[1]) {
 848                        comment_line_char = value[0];
 849                        auto_comment_line_char = 0;
 850                } else
 851                        return error("core.commentChar should only be one character");
 852                return 0;
 853        }
 854
 855        if (!strcmp(var, "core.askpass"))
 856                return git_config_string(&askpass_program, var, value);
 857
 858        if (!strcmp(var, "core.excludesfile"))
 859                return git_config_pathname(&excludes_file, var, value);
 860
 861        if (!strcmp(var, "core.whitespace")) {
 862                if (!value)
 863                        return config_error_nonbool(var);
 864                whitespace_rule_cfg = parse_whitespace_rule(value);
 865                return 0;
 866        }
 867
 868        if (!strcmp(var, "core.fsyncobjectfiles")) {
 869                fsync_object_files = git_config_bool(var, value);
 870                return 0;
 871        }
 872
 873        if (!strcmp(var, "core.preloadindex")) {
 874                core_preload_index = git_config_bool(var, value);
 875                return 0;
 876        }
 877
 878        if (!strcmp(var, "core.createobject")) {
 879                if (!strcmp(value, "rename"))
 880                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 881                else if (!strcmp(value, "link"))
 882                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 883                else
 884                        die(_("invalid mode for object creation: %s"), value);
 885                return 0;
 886        }
 887
 888        if (!strcmp(var, "core.sparsecheckout")) {
 889                core_apply_sparse_checkout = git_config_bool(var, value);
 890                return 0;
 891        }
 892
 893        if (!strcmp(var, "core.precomposeunicode")) {
 894                precomposed_unicode = git_config_bool(var, value);
 895                return 0;
 896        }
 897
 898        /* Add other config variables here and to Documentation/config.txt. */
 899        return 0;
 900}
 901
 902static int git_default_i18n_config(const char *var, const char *value)
 903{
 904        if (!strcmp(var, "i18n.commitencoding"))
 905                return git_config_string(&git_commit_encoding, var, value);
 906
 907        if (!strcmp(var, "i18n.logoutputencoding"))
 908                return git_config_string(&git_log_output_encoding, var, value);
 909
 910        /* Add other config variables here and to Documentation/config.txt. */
 911        return 0;
 912}
 913
 914static int git_default_branch_config(const char *var, const char *value)
 915{
 916        if (!strcmp(var, "branch.autosetupmerge")) {
 917                if (value && !strcasecmp(value, "always")) {
 918                        git_branch_track = BRANCH_TRACK_ALWAYS;
 919                        return 0;
 920                }
 921                git_branch_track = git_config_bool(var, value);
 922                return 0;
 923        }
 924        if (!strcmp(var, "branch.autosetuprebase")) {
 925                if (!value)
 926                        return config_error_nonbool(var);
 927                else if (!strcmp(value, "never"))
 928                        autorebase = AUTOREBASE_NEVER;
 929                else if (!strcmp(value, "local"))
 930                        autorebase = AUTOREBASE_LOCAL;
 931                else if (!strcmp(value, "remote"))
 932                        autorebase = AUTOREBASE_REMOTE;
 933                else if (!strcmp(value, "always"))
 934                        autorebase = AUTOREBASE_ALWAYS;
 935                else
 936                        return error("Malformed value for %s", var);
 937                return 0;
 938        }
 939
 940        /* Add other config variables here and to Documentation/config.txt. */
 941        return 0;
 942}
 943
 944static int git_default_push_config(const char *var, const char *value)
 945{
 946        if (!strcmp(var, "push.default")) {
 947                if (!value)
 948                        return config_error_nonbool(var);
 949                else if (!strcmp(value, "nothing"))
 950                        push_default = PUSH_DEFAULT_NOTHING;
 951                else if (!strcmp(value, "matching"))
 952                        push_default = PUSH_DEFAULT_MATCHING;
 953                else if (!strcmp(value, "simple"))
 954                        push_default = PUSH_DEFAULT_SIMPLE;
 955                else if (!strcmp(value, "upstream"))
 956                        push_default = PUSH_DEFAULT_UPSTREAM;
 957                else if (!strcmp(value, "tracking")) /* deprecated */
 958                        push_default = PUSH_DEFAULT_UPSTREAM;
 959                else if (!strcmp(value, "current"))
 960                        push_default = PUSH_DEFAULT_CURRENT;
 961                else {
 962                        error("Malformed value for %s: %s", var, value);
 963                        return error("Must be one of nothing, matching, simple, "
 964                                     "upstream or current.");
 965                }
 966                return 0;
 967        }
 968
 969        /* Add other config variables here and to Documentation/config.txt. */
 970        return 0;
 971}
 972
 973static int git_default_mailmap_config(const char *var, const char *value)
 974{
 975        if (!strcmp(var, "mailmap.file"))
 976                return git_config_pathname(&git_mailmap_file, var, value);
 977        if (!strcmp(var, "mailmap.blob"))
 978                return git_config_string(&git_mailmap_blob, var, value);
 979
 980        /* Add other config variables here and to Documentation/config.txt. */
 981        return 0;
 982}
 983
 984int git_default_config(const char *var, const char *value, void *dummy)
 985{
 986        if (starts_with(var, "core."))
 987                return git_default_core_config(var, value);
 988
 989        if (starts_with(var, "user."))
 990                return git_ident_config(var, value, dummy);
 991
 992        if (starts_with(var, "i18n."))
 993                return git_default_i18n_config(var, value);
 994
 995        if (starts_with(var, "branch."))
 996                return git_default_branch_config(var, value);
 997
 998        if (starts_with(var, "push."))
 999                return git_default_push_config(var, value);
1000
1001        if (starts_with(var, "mailmap."))
1002                return git_default_mailmap_config(var, value);
1003
1004        if (starts_with(var, "advice."))
1005                return git_default_advice_config(var, value);
1006
1007        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1008                pager_use_color = git_config_bool(var,value);
1009                return 0;
1010        }
1011
1012        if (!strcmp(var, "pack.packsizelimit")) {
1013                pack_size_limit_cfg = git_config_ulong(var, value);
1014                return 0;
1015        }
1016        /* Add other config variables here and to Documentation/config.txt. */
1017        return 0;
1018}
1019
1020/*
1021 * All source specific fields in the union, die_on_error, name and the callbacks
1022 * fgetc, ungetc, ftell of top need to be initialized before calling
1023 * this function.
1024 */
1025static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1026{
1027        int ret;
1028
1029        /* push config-file parsing state stack */
1030        top->prev = cf;
1031        top->linenr = 1;
1032        top->eof = 0;
1033        strbuf_init(&top->value, 1024);
1034        strbuf_init(&top->var, 1024);
1035        cf = top;
1036
1037        ret = git_parse_source(fn, data);
1038
1039        /* pop config-file parsing state stack */
1040        strbuf_release(&top->value);
1041        strbuf_release(&top->var);
1042        cf = top->prev;
1043
1044        return ret;
1045}
1046
1047static int do_config_from_file(config_fn_t fn,
1048                const char *name, const char *path, FILE *f, void *data)
1049{
1050        struct config_source top;
1051
1052        top.u.file = f;
1053        top.name = name;
1054        top.path = path;
1055        top.die_on_error = 1;
1056        top.do_fgetc = config_file_fgetc;
1057        top.do_ungetc = config_file_ungetc;
1058        top.do_ftell = config_file_ftell;
1059
1060        return do_config_from(&top, fn, data);
1061}
1062
1063static int git_config_from_stdin(config_fn_t fn, void *data)
1064{
1065        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1066}
1067
1068int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1069{
1070        int ret = -1;
1071        FILE *f;
1072
1073        f = fopen(filename, "r");
1074        if (f) {
1075                ret = do_config_from_file(fn, filename, filename, f, data);
1076                fclose(f);
1077        }
1078        return ret;
1079}
1080
1081int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1082                        size_t len, void *data)
1083{
1084        struct config_source top;
1085
1086        top.u.buf.buf = buf;
1087        top.u.buf.len = len;
1088        top.u.buf.pos = 0;
1089        top.name = name;
1090        top.path = NULL;
1091        top.die_on_error = 0;
1092        top.do_fgetc = config_buf_fgetc;
1093        top.do_ungetc = config_buf_ungetc;
1094        top.do_ftell = config_buf_ftell;
1095
1096        return do_config_from(&top, fn, data);
1097}
1098
1099static int git_config_from_blob_sha1(config_fn_t fn,
1100                                     const char *name,
1101                                     const unsigned char *sha1,
1102                                     void *data)
1103{
1104        enum object_type type;
1105        char *buf;
1106        unsigned long size;
1107        int ret;
1108
1109        buf = read_sha1_file(sha1, &type, &size);
1110        if (!buf)
1111                return error("unable to load config blob object '%s'", name);
1112        if (type != OBJ_BLOB) {
1113                free(buf);
1114                return error("reference '%s' does not point to a blob", name);
1115        }
1116
1117        ret = git_config_from_buf(fn, name, buf, size, data);
1118        free(buf);
1119
1120        return ret;
1121}
1122
1123static int git_config_from_blob_ref(config_fn_t fn,
1124                                    const char *name,
1125                                    void *data)
1126{
1127        unsigned char sha1[20];
1128
1129        if (get_sha1(name, sha1) < 0)
1130                return error("unable to resolve config blob '%s'", name);
1131        return git_config_from_blob_sha1(fn, name, sha1, data);
1132}
1133
1134const char *git_etc_gitconfig(void)
1135{
1136        static const char *system_wide;
1137        if (!system_wide)
1138                system_wide = system_path(ETC_GITCONFIG);
1139        return system_wide;
1140}
1141
1142/*
1143 * Parse environment variable 'k' as a boolean (in various
1144 * possible spellings); if missing, use the default value 'def'.
1145 */
1146int git_env_bool(const char *k, int def)
1147{
1148        const char *v = getenv(k);
1149        return v ? git_config_bool(k, v) : def;
1150}
1151
1152/*
1153 * Parse environment variable 'k' as ulong with possibly a unit
1154 * suffix; if missing, use the default value 'val'.
1155 */
1156unsigned long git_env_ulong(const char *k, unsigned long val)
1157{
1158        const char *v = getenv(k);
1159        if (v && !git_parse_ulong(v, &val))
1160                die("failed to parse %s", k);
1161        return val;
1162}
1163
1164int git_config_system(void)
1165{
1166        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1167}
1168
1169int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1170{
1171        int ret = 0, found = 0;
1172        char *xdg_config = NULL;
1173        char *user_config = NULL;
1174
1175        home_config_paths(&user_config, &xdg_config, "config");
1176
1177        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1178                ret += git_config_from_file(fn, git_etc_gitconfig(),
1179                                            data);
1180                found += 1;
1181        }
1182
1183        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1184                ret += git_config_from_file(fn, xdg_config, data);
1185                found += 1;
1186        }
1187
1188        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1189                ret += git_config_from_file(fn, user_config, data);
1190                found += 1;
1191        }
1192
1193        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1194                ret += git_config_from_file(fn, repo_config, data);
1195                found += 1;
1196        }
1197
1198        switch (git_config_from_parameters(fn, data)) {
1199        case -1: /* error */
1200                die(_("unable to parse command-line config"));
1201                break;
1202        case 0: /* found nothing */
1203                break;
1204        default: /* found at least one item */
1205                found++;
1206                break;
1207        }
1208
1209        free(xdg_config);
1210        free(user_config);
1211        return ret == 0 ? found : ret;
1212}
1213
1214int git_config_with_options(config_fn_t fn, void *data,
1215                            struct git_config_source *config_source,
1216                            int respect_includes)
1217{
1218        char *repo_config = NULL;
1219        int ret;
1220        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1221
1222        if (respect_includes) {
1223                inc.fn = fn;
1224                inc.data = data;
1225                fn = git_config_include;
1226                data = &inc;
1227        }
1228
1229        /*
1230         * If we have a specific filename, use it. Otherwise, follow the
1231         * regular lookup sequence.
1232         */
1233        if (config_source && config_source->use_stdin)
1234                return git_config_from_stdin(fn, data);
1235        else if (config_source && config_source->file)
1236                return git_config_from_file(fn, config_source->file, data);
1237        else if (config_source && config_source->blob)
1238                return git_config_from_blob_ref(fn, config_source->blob, data);
1239
1240        repo_config = git_pathdup("config");
1241        ret = git_config_early(fn, data, repo_config);
1242        if (repo_config)
1243                free(repo_config);
1244        return ret;
1245}
1246
1247static void git_config_raw(config_fn_t fn, void *data)
1248{
1249        if (git_config_with_options(fn, data, NULL, 1) < 0)
1250                /*
1251                 * git_config_with_options() normally returns only
1252                 * positive values, as most errors are fatal, and
1253                 * non-fatal potential errors are guarded by "if"
1254                 * statements that are entered only when no error is
1255                 * possible.
1256                 *
1257                 * If we ever encounter a non-fatal error, it means
1258                 * something went really wrong and we should stop
1259                 * immediately.
1260                 */
1261                die(_("unknown error occured while reading the configuration files"));
1262}
1263
1264static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1265{
1266        int i, value_index;
1267        struct string_list *values;
1268        struct config_set_element *entry;
1269        struct configset_list *list = &cs->list;
1270        struct key_value_info *kv_info;
1271
1272        for (i = 0; i < list->nr; i++) {
1273                entry = list->items[i].e;
1274                value_index = list->items[i].value_index;
1275                values = &entry->value_list;
1276                if (fn(entry->key, values->items[value_index].string, data) < 0) {
1277                        kv_info = values->items[value_index].util;
1278                        git_die_config_linenr(entry->key, kv_info->filename, kv_info->linenr);
1279                }
1280        }
1281}
1282
1283static void git_config_check_init(void);
1284
1285void git_config(config_fn_t fn, void *data)
1286{
1287        git_config_check_init();
1288        configset_iter(&the_config_set, fn, data);
1289}
1290
1291static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1292{
1293        struct config_set_element k;
1294        struct config_set_element *found_entry;
1295        char *normalized_key;
1296        int ret;
1297        /*
1298         * `key` may come from the user, so normalize it before using it
1299         * for querying entries from the hashmap.
1300         */
1301        ret = git_config_parse_key(key, &normalized_key, NULL);
1302
1303        if (ret)
1304                return NULL;
1305
1306        hashmap_entry_init(&k, strhash(normalized_key));
1307        k.key = normalized_key;
1308        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1309        free(normalized_key);
1310        return found_entry;
1311}
1312
1313static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1314{
1315        struct config_set_element *e;
1316        struct string_list_item *si;
1317        struct configset_list_item *l_item;
1318        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1319
1320        e = configset_find_element(cs, key);
1321        /*
1322         * Since the keys are being fed by git_config*() callback mechanism, they
1323         * are already normalized. So simply add them without any further munging.
1324         */
1325        if (!e) {
1326                e = xmalloc(sizeof(*e));
1327                hashmap_entry_init(e, strhash(key));
1328                e->key = xstrdup(key);
1329                string_list_init(&e->value_list, 1);
1330                hashmap_add(&cs->config_hash, e);
1331        }
1332        si = string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1333
1334        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1335        l_item = &cs->list.items[cs->list.nr++];
1336        l_item->e = e;
1337        l_item->value_index = e->value_list.nr - 1;
1338
1339        if (cf) {
1340                kv_info->filename = strintern(cf->name);
1341                kv_info->linenr = cf->linenr;
1342        } else {
1343                /* for values read from `git_config_from_parameters()` */
1344                kv_info->filename = NULL;
1345                kv_info->linenr = -1;
1346        }
1347        si->util = kv_info;
1348
1349        return 0;
1350}
1351
1352static int config_set_element_cmp(const struct config_set_element *e1,
1353                                 const struct config_set_element *e2, const void *unused)
1354{
1355        return strcmp(e1->key, e2->key);
1356}
1357
1358void git_configset_init(struct config_set *cs)
1359{
1360        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1361        cs->hash_initialized = 1;
1362        cs->list.nr = 0;
1363        cs->list.alloc = 0;
1364        cs->list.items = NULL;
1365}
1366
1367void git_configset_clear(struct config_set *cs)
1368{
1369        struct config_set_element *entry;
1370        struct hashmap_iter iter;
1371        if (!cs->hash_initialized)
1372                return;
1373
1374        hashmap_iter_init(&cs->config_hash, &iter);
1375        while ((entry = hashmap_iter_next(&iter))) {
1376                free(entry->key);
1377                string_list_clear(&entry->value_list, 1);
1378        }
1379        hashmap_free(&cs->config_hash, 1);
1380        cs->hash_initialized = 0;
1381        free(cs->list.items);
1382        cs->list.nr = 0;
1383        cs->list.alloc = 0;
1384        cs->list.items = NULL;
1385}
1386
1387static int config_set_callback(const char *key, const char *value, void *cb)
1388{
1389        struct config_set *cs = cb;
1390        configset_add_value(cs, key, value);
1391        return 0;
1392}
1393
1394int git_configset_add_file(struct config_set *cs, const char *filename)
1395{
1396        return git_config_from_file(config_set_callback, filename, cs);
1397}
1398
1399int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1400{
1401        const struct string_list *values = NULL;
1402        /*
1403         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1404         * queried key in the files of the configset, the value returned will be the last
1405         * value in the value list for that key.
1406         */
1407        values = git_configset_get_value_multi(cs, key);
1408
1409        if (!values)
1410                return 1;
1411        assert(values->nr > 0);
1412        *value = values->items[values->nr - 1].string;
1413        return 0;
1414}
1415
1416const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1417{
1418        struct config_set_element *e = configset_find_element(cs, key);
1419        return e ? &e->value_list : NULL;
1420}
1421
1422int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1423{
1424        const char *value;
1425        if (!git_configset_get_value(cs, key, &value))
1426                return git_config_string(dest, key, value);
1427        else
1428                return 1;
1429}
1430
1431int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1432{
1433        return git_configset_get_string_const(cs, key, (const char **)dest);
1434}
1435
1436int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1437{
1438        const char *value;
1439        if (!git_configset_get_value(cs, key, &value)) {
1440                *dest = git_config_int(key, value);
1441                return 0;
1442        } else
1443                return 1;
1444}
1445
1446int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1447{
1448        const char *value;
1449        if (!git_configset_get_value(cs, key, &value)) {
1450                *dest = git_config_ulong(key, value);
1451                return 0;
1452        } else
1453                return 1;
1454}
1455
1456int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1457{
1458        const char *value;
1459        if (!git_configset_get_value(cs, key, &value)) {
1460                *dest = git_config_bool(key, value);
1461                return 0;
1462        } else
1463                return 1;
1464}
1465
1466int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1467                                int *is_bool, int *dest)
1468{
1469        const char *value;
1470        if (!git_configset_get_value(cs, key, &value)) {
1471                *dest = git_config_bool_or_int(key, value, is_bool);
1472                return 0;
1473        } else
1474                return 1;
1475}
1476
1477int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1478{
1479        const char *value;
1480        if (!git_configset_get_value(cs, key, &value)) {
1481                *dest = git_config_maybe_bool(key, value);
1482                if (*dest == -1)
1483                        return -1;
1484                return 0;
1485        } else
1486                return 1;
1487}
1488
1489int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1490{
1491        const char *value;
1492        if (!git_configset_get_value(cs, key, &value))
1493                return git_config_pathname(dest, key, value);
1494        else
1495                return 1;
1496}
1497
1498static void git_config_check_init(void)
1499{
1500        if (the_config_set.hash_initialized)
1501                return;
1502        git_configset_init(&the_config_set);
1503        git_config_raw(config_set_callback, &the_config_set);
1504}
1505
1506void git_config_clear(void)
1507{
1508        if (!the_config_set.hash_initialized)
1509                return;
1510        git_configset_clear(&the_config_set);
1511}
1512
1513int git_config_get_value(const char *key, const char **value)
1514{
1515        git_config_check_init();
1516        return git_configset_get_value(&the_config_set, key, value);
1517}
1518
1519const struct string_list *git_config_get_value_multi(const char *key)
1520{
1521        git_config_check_init();
1522        return git_configset_get_value_multi(&the_config_set, key);
1523}
1524
1525int git_config_get_string_const(const char *key, const char **dest)
1526{
1527        int ret;
1528        git_config_check_init();
1529        ret = git_configset_get_string_const(&the_config_set, key, dest);
1530        if (ret < 0)
1531                git_die_config(key, NULL);
1532        return ret;
1533}
1534
1535int git_config_get_string(const char *key, char **dest)
1536{
1537        git_config_check_init();
1538        return git_config_get_string_const(key, (const char **)dest);
1539}
1540
1541int git_config_get_int(const char *key, int *dest)
1542{
1543        git_config_check_init();
1544        return git_configset_get_int(&the_config_set, key, dest);
1545}
1546
1547int git_config_get_ulong(const char *key, unsigned long *dest)
1548{
1549        git_config_check_init();
1550        return git_configset_get_ulong(&the_config_set, key, dest);
1551}
1552
1553int git_config_get_bool(const char *key, int *dest)
1554{
1555        git_config_check_init();
1556        return git_configset_get_bool(&the_config_set, key, dest);
1557}
1558
1559int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1560{
1561        git_config_check_init();
1562        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1563}
1564
1565int git_config_get_maybe_bool(const char *key, int *dest)
1566{
1567        git_config_check_init();
1568        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1569}
1570
1571int git_config_get_pathname(const char *key, const char **dest)
1572{
1573        int ret;
1574        git_config_check_init();
1575        ret = git_configset_get_pathname(&the_config_set, key, dest);
1576        if (ret < 0)
1577                git_die_config(key, NULL);
1578        return ret;
1579}
1580
1581NORETURN
1582void git_die_config_linenr(const char *key, const char *filename, int linenr)
1583{
1584        if (!filename)
1585                die(_("unable to parse '%s' from command-line config"), key);
1586        else
1587                die(_("bad config variable '%s' in file '%s' at line %d"),
1588                    key, filename, linenr);
1589}
1590
1591NORETURN __attribute__((format(printf, 2, 3)))
1592void git_die_config(const char *key, const char *err, ...)
1593{
1594        const struct string_list *values;
1595        struct key_value_info *kv_info;
1596
1597        if (err) {
1598                va_list params;
1599                va_start(params, err);
1600                vreportf("error: ", err, params);
1601                va_end(params);
1602        }
1603        values = git_config_get_value_multi(key);
1604        kv_info = values->items[values->nr - 1].util;
1605        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1606}
1607
1608/*
1609 * Find all the stuff for git_config_set() below.
1610 */
1611
1612static struct {
1613        int baselen;
1614        char *key;
1615        int do_not_match;
1616        regex_t *value_regex;
1617        int multi_replace;
1618        size_t *offset;
1619        unsigned int offset_alloc;
1620        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1621        int seen;
1622} store;
1623
1624static int matches(const char *key, const char *value)
1625{
1626        if (strcmp(key, store.key))
1627                return 0; /* not ours */
1628        if (!store.value_regex)
1629                return 1; /* always matches */
1630        if (store.value_regex == CONFIG_REGEX_NONE)
1631                return 0; /* never matches */
1632
1633        return store.do_not_match ^
1634                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1635}
1636
1637static int store_aux(const char *key, const char *value, void *cb)
1638{
1639        const char *ep;
1640        size_t section_len;
1641
1642        switch (store.state) {
1643        case KEY_SEEN:
1644                if (matches(key, value)) {
1645                        if (store.seen == 1 && store.multi_replace == 0) {
1646                                warning(_("%s has multiple values"), key);
1647                        }
1648
1649                        ALLOC_GROW(store.offset, store.seen + 1,
1650                                   store.offset_alloc);
1651
1652                        store.offset[store.seen] = cf->do_ftell(cf);
1653                        store.seen++;
1654                }
1655                break;
1656        case SECTION_SEEN:
1657                /*
1658                 * What we are looking for is in store.key (both
1659                 * section and var), and its section part is baselen
1660                 * long.  We found key (again, both section and var).
1661                 * We would want to know if this key is in the same
1662                 * section as what we are looking for.  We already
1663                 * know we are in the same section as what should
1664                 * hold store.key.
1665                 */
1666                ep = strrchr(key, '.');
1667                section_len = ep - key;
1668
1669                if ((section_len != store.baselen) ||
1670                    memcmp(key, store.key, section_len+1)) {
1671                        store.state = SECTION_END_SEEN;
1672                        break;
1673                }
1674
1675                /*
1676                 * Do not increment matches: this is no match, but we
1677                 * just made sure we are in the desired section.
1678                 */
1679                ALLOC_GROW(store.offset, store.seen + 1,
1680                           store.offset_alloc);
1681                store.offset[store.seen] = cf->do_ftell(cf);
1682                /* fallthru */
1683        case SECTION_END_SEEN:
1684        case START:
1685                if (matches(key, value)) {
1686                        ALLOC_GROW(store.offset, store.seen + 1,
1687                                   store.offset_alloc);
1688                        store.offset[store.seen] = cf->do_ftell(cf);
1689                        store.state = KEY_SEEN;
1690                        store.seen++;
1691                } else {
1692                        if (strrchr(key, '.') - key == store.baselen &&
1693                              !strncmp(key, store.key, store.baselen)) {
1694                                        store.state = SECTION_SEEN;
1695                                        ALLOC_GROW(store.offset,
1696                                                   store.seen + 1,
1697                                                   store.offset_alloc);
1698                                        store.offset[store.seen] = cf->do_ftell(cf);
1699                        }
1700                }
1701        }
1702        return 0;
1703}
1704
1705static int write_error(const char *filename)
1706{
1707        error("failed to write new configuration file %s", filename);
1708
1709        /* Same error code as "failed to rename". */
1710        return 4;
1711}
1712
1713static int store_write_section(int fd, const char *key)
1714{
1715        const char *dot;
1716        int i, success;
1717        struct strbuf sb = STRBUF_INIT;
1718
1719        dot = memchr(key, '.', store.baselen);
1720        if (dot) {
1721                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1722                for (i = dot - key + 1; i < store.baselen; i++) {
1723                        if (key[i] == '"' || key[i] == '\\')
1724                                strbuf_addch(&sb, '\\');
1725                        strbuf_addch(&sb, key[i]);
1726                }
1727                strbuf_addstr(&sb, "\"]\n");
1728        } else {
1729                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1730        }
1731
1732        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1733        strbuf_release(&sb);
1734
1735        return success;
1736}
1737
1738static int store_write_pair(int fd, const char *key, const char *value)
1739{
1740        int i, success;
1741        int length = strlen(key + store.baselen + 1);
1742        const char *quote = "";
1743        struct strbuf sb = STRBUF_INIT;
1744
1745        /*
1746         * Check to see if the value needs to be surrounded with a dq pair.
1747         * Note that problematic characters are always backslash-quoted; this
1748         * check is about not losing leading or trailing SP and strings that
1749         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1750         * configuration parser.
1751         */
1752        if (value[0] == ' ')
1753                quote = "\"";
1754        for (i = 0; value[i]; i++)
1755                if (value[i] == ';' || value[i] == '#')
1756                        quote = "\"";
1757        if (i && value[i - 1] == ' ')
1758                quote = "\"";
1759
1760        strbuf_addf(&sb, "\t%.*s = %s",
1761                    length, key + store.baselen + 1, quote);
1762
1763        for (i = 0; value[i]; i++)
1764                switch (value[i]) {
1765                case '\n':
1766                        strbuf_addstr(&sb, "\\n");
1767                        break;
1768                case '\t':
1769                        strbuf_addstr(&sb, "\\t");
1770                        break;
1771                case '"':
1772                case '\\':
1773                        strbuf_addch(&sb, '\\');
1774                default:
1775                        strbuf_addch(&sb, value[i]);
1776                        break;
1777                }
1778        strbuf_addf(&sb, "%s\n", quote);
1779
1780        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1781        strbuf_release(&sb);
1782
1783        return success;
1784}
1785
1786static ssize_t find_beginning_of_line(const char *contents, size_t size,
1787        size_t offset_, int *found_bracket)
1788{
1789        size_t equal_offset = size, bracket_offset = size;
1790        ssize_t offset;
1791
1792contline:
1793        for (offset = offset_-2; offset > 0
1794                        && contents[offset] != '\n'; offset--)
1795                switch (contents[offset]) {
1796                        case '=': equal_offset = offset; break;
1797                        case ']': bracket_offset = offset; break;
1798                }
1799        if (offset > 0 && contents[offset-1] == '\\') {
1800                offset_ = offset;
1801                goto contline;
1802        }
1803        if (bracket_offset < equal_offset) {
1804                *found_bracket = 1;
1805                offset = bracket_offset+1;
1806        } else
1807                offset++;
1808
1809        return offset;
1810}
1811
1812int git_config_set_in_file(const char *config_filename,
1813                        const char *key, const char *value)
1814{
1815        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1816}
1817
1818int git_config_set(const char *key, const char *value)
1819{
1820        return git_config_set_multivar(key, value, NULL, 0);
1821}
1822
1823/*
1824 * Auxiliary function to sanity-check and split the key into the section
1825 * identifier and variable name.
1826 *
1827 * Returns 0 on success, -1 when there is an invalid character in the key and
1828 * -2 if there is no section name in the key.
1829 *
1830 * store_key - pointer to char* which will hold a copy of the key with
1831 *             lowercase section and variable name
1832 * baselen - pointer to int which will hold the length of the
1833 *           section + subsection part, can be NULL
1834 */
1835int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1836{
1837        int i, dot, baselen;
1838        const char *last_dot = strrchr(key, '.');
1839
1840        /*
1841         * Since "key" actually contains the section name and the real
1842         * key name separated by a dot, we have to know where the dot is.
1843         */
1844
1845        if (last_dot == NULL || last_dot == key) {
1846                error("key does not contain a section: %s", key);
1847                return -CONFIG_NO_SECTION_OR_NAME;
1848        }
1849
1850        if (!last_dot[1]) {
1851                error("key does not contain variable name: %s", key);
1852                return -CONFIG_NO_SECTION_OR_NAME;
1853        }
1854
1855        baselen = last_dot - key;
1856        if (baselen_)
1857                *baselen_ = baselen;
1858
1859        /*
1860         * Validate the key and while at it, lower case it for matching.
1861         */
1862        *store_key = xmalloc(strlen(key) + 1);
1863
1864        dot = 0;
1865        for (i = 0; key[i]; i++) {
1866                unsigned char c = key[i];
1867                if (c == '.')
1868                        dot = 1;
1869                /* Leave the extended basename untouched.. */
1870                if (!dot || i > baselen) {
1871                        if (!iskeychar(c) ||
1872                            (i == baselen + 1 && !isalpha(c))) {
1873                                error("invalid key: %s", key);
1874                                goto out_free_ret_1;
1875                        }
1876                        c = tolower(c);
1877                } else if (c == '\n') {
1878                        error("invalid key (newline): %s", key);
1879                        goto out_free_ret_1;
1880                }
1881                (*store_key)[i] = c;
1882        }
1883        (*store_key)[i] = 0;
1884
1885        return 0;
1886
1887out_free_ret_1:
1888        free(*store_key);
1889        *store_key = NULL;
1890        return -CONFIG_INVALID_KEY;
1891}
1892
1893/*
1894 * If value==NULL, unset in (remove from) config,
1895 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1896 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
1897 *     (only add a new one)
1898 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1899 *     else all matching key/values (regardless how many) are removed,
1900 *     before the new pair is written.
1901 *
1902 * Returns 0 on success.
1903 *
1904 * This function does this:
1905 *
1906 * - it locks the config file by creating ".git/config.lock"
1907 *
1908 * - it then parses the config using store_aux() as validator to find
1909 *   the position on the key/value pair to replace. If it is to be unset,
1910 *   it must be found exactly once.
1911 *
1912 * - the config file is mmap()ed and the part before the match (if any) is
1913 *   written to the lock file, then the changed part and the rest.
1914 *
1915 * - the config file is removed and the lock file rename()d to it.
1916 *
1917 */
1918int git_config_set_multivar_in_file(const char *config_filename,
1919                                const char *key, const char *value,
1920                                const char *value_regex, int multi_replace)
1921{
1922        int fd = -1, in_fd;
1923        int ret;
1924        struct lock_file *lock = NULL;
1925        char *filename_buf = NULL;
1926
1927        /* parse-key returns negative; flip the sign to feed exit(3) */
1928        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1929        if (ret)
1930                goto out_free;
1931
1932        store.multi_replace = multi_replace;
1933
1934        if (!config_filename)
1935                config_filename = filename_buf = git_pathdup("config");
1936
1937        /*
1938         * The lock serves a purpose in addition to locking: the new
1939         * contents of .git/config will be written into it.
1940         */
1941        lock = xcalloc(1, sizeof(struct lock_file));
1942        fd = hold_lock_file_for_update(lock, config_filename, 0);
1943        if (fd < 0) {
1944                error("could not lock config file %s: %s", config_filename, strerror(errno));
1945                free(store.key);
1946                ret = CONFIG_NO_LOCK;
1947                goto out_free;
1948        }
1949
1950        /*
1951         * If .git/config does not exist yet, write a minimal version.
1952         */
1953        in_fd = open(config_filename, O_RDONLY);
1954        if ( in_fd < 0 ) {
1955                free(store.key);
1956
1957                if ( ENOENT != errno ) {
1958                        error("opening %s: %s", config_filename,
1959                              strerror(errno));
1960                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1961                        goto out_free;
1962                }
1963                /* if nothing to unset, error out */
1964                if (value == NULL) {
1965                        ret = CONFIG_NOTHING_SET;
1966                        goto out_free;
1967                }
1968
1969                store.key = (char *)key;
1970                if (!store_write_section(fd, key) ||
1971                    !store_write_pair(fd, key, value))
1972                        goto write_err_out;
1973        } else {
1974                struct stat st;
1975                char *contents;
1976                size_t contents_sz, copy_begin, copy_end;
1977                int i, new_line = 0;
1978
1979                if (value_regex == NULL)
1980                        store.value_regex = NULL;
1981                else if (value_regex == CONFIG_REGEX_NONE)
1982                        store.value_regex = CONFIG_REGEX_NONE;
1983                else {
1984                        if (value_regex[0] == '!') {
1985                                store.do_not_match = 1;
1986                                value_regex++;
1987                        } else
1988                                store.do_not_match = 0;
1989
1990                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1991                        if (regcomp(store.value_regex, value_regex,
1992                                        REG_EXTENDED)) {
1993                                error("invalid pattern: %s", value_regex);
1994                                free(store.value_regex);
1995                                ret = CONFIG_INVALID_PATTERN;
1996                                goto out_free;
1997                        }
1998                }
1999
2000                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2001                store.offset[0] = 0;
2002                store.state = START;
2003                store.seen = 0;
2004
2005                /*
2006                 * After this, store.offset will contain the *end* offset
2007                 * of the last match, or remain at 0 if no match was found.
2008                 * As a side effect, we make sure to transform only a valid
2009                 * existing config file.
2010                 */
2011                if (git_config_from_file(store_aux, config_filename, NULL)) {
2012                        error("invalid config file %s", config_filename);
2013                        free(store.key);
2014                        if (store.value_regex != NULL &&
2015                            store.value_regex != CONFIG_REGEX_NONE) {
2016                                regfree(store.value_regex);
2017                                free(store.value_regex);
2018                        }
2019                        ret = CONFIG_INVALID_FILE;
2020                        goto out_free;
2021                }
2022
2023                free(store.key);
2024                if (store.value_regex != NULL &&
2025                    store.value_regex != CONFIG_REGEX_NONE) {
2026                        regfree(store.value_regex);
2027                        free(store.value_regex);
2028                }
2029
2030                /* if nothing to unset, or too many matches, error out */
2031                if ((store.seen == 0 && value == NULL) ||
2032                                (store.seen > 1 && multi_replace == 0)) {
2033                        ret = CONFIG_NOTHING_SET;
2034                        goto out_free;
2035                }
2036
2037                fstat(in_fd, &st);
2038                contents_sz = xsize_t(st.st_size);
2039                contents = xmmap(NULL, contents_sz, PROT_READ,
2040                        MAP_PRIVATE, in_fd, 0);
2041                close(in_fd);
2042
2043                if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2044                        error("chmod on %s failed: %s",
2045                                lock->filename, strerror(errno));
2046                        ret = CONFIG_NO_WRITE;
2047                        goto out_free;
2048                }
2049
2050                if (store.seen == 0)
2051                        store.seen = 1;
2052
2053                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2054                        if (store.offset[i] == 0) {
2055                                store.offset[i] = copy_end = contents_sz;
2056                        } else if (store.state != KEY_SEEN) {
2057                                copy_end = store.offset[i];
2058                        } else
2059                                copy_end = find_beginning_of_line(
2060                                        contents, contents_sz,
2061                                        store.offset[i]-2, &new_line);
2062
2063                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2064                                new_line = 1;
2065
2066                        /* write the first part of the config */
2067                        if (copy_end > copy_begin) {
2068                                if (write_in_full(fd, contents + copy_begin,
2069                                                  copy_end - copy_begin) <
2070                                    copy_end - copy_begin)
2071                                        goto write_err_out;
2072                                if (new_line &&
2073                                    write_str_in_full(fd, "\n") != 1)
2074                                        goto write_err_out;
2075                        }
2076                        copy_begin = store.offset[i];
2077                }
2078
2079                /* write the pair (value == NULL means unset) */
2080                if (value != NULL) {
2081                        if (store.state == START) {
2082                                if (!store_write_section(fd, key))
2083                                        goto write_err_out;
2084                        }
2085                        if (!store_write_pair(fd, key, value))
2086                                goto write_err_out;
2087                }
2088
2089                /* write the rest of the config */
2090                if (copy_begin < contents_sz)
2091                        if (write_in_full(fd, contents + copy_begin,
2092                                          contents_sz - copy_begin) <
2093                            contents_sz - copy_begin)
2094                                goto write_err_out;
2095
2096                munmap(contents, contents_sz);
2097        }
2098
2099        if (commit_lock_file(lock) < 0) {
2100                error("could not commit config file %s", config_filename);
2101                ret = CONFIG_NO_WRITE;
2102                goto out_free;
2103        }
2104
2105        /*
2106         * lock is committed, so don't try to roll it back below.
2107         * NOTE: Since lockfile.c keeps a linked list of all created
2108         * lock_file structures, it isn't safe to free(lock).  It's
2109         * better to just leave it hanging around.
2110         */
2111        lock = NULL;
2112        ret = 0;
2113
2114        /* Invalidate the config cache */
2115        git_config_clear();
2116
2117out_free:
2118        if (lock)
2119                rollback_lock_file(lock);
2120        free(filename_buf);
2121        return ret;
2122
2123write_err_out:
2124        ret = write_error(lock->filename);
2125        goto out_free;
2126
2127}
2128
2129int git_config_set_multivar(const char *key, const char *value,
2130                        const char *value_regex, int multi_replace)
2131{
2132        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
2133                                               multi_replace);
2134}
2135
2136static int section_name_match (const char *buf, const char *name)
2137{
2138        int i = 0, j = 0, dot = 0;
2139        if (buf[i] != '[')
2140                return 0;
2141        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2142                if (!dot && isspace(buf[i])) {
2143                        dot = 1;
2144                        if (name[j++] != '.')
2145                                break;
2146                        for (i++; isspace(buf[i]); i++)
2147                                ; /* do nothing */
2148                        if (buf[i] != '"')
2149                                break;
2150                        continue;
2151                }
2152                if (buf[i] == '\\' && dot)
2153                        i++;
2154                else if (buf[i] == '"' && dot) {
2155                        for (i++; isspace(buf[i]); i++)
2156                                ; /* do_nothing */
2157                        break;
2158                }
2159                if (buf[i] != name[j++])
2160                        break;
2161        }
2162        if (buf[i] == ']' && name[j] == 0) {
2163                /*
2164                 * We match, now just find the right length offset by
2165                 * gobbling up any whitespace after it, as well
2166                 */
2167                i++;
2168                for (; buf[i] && isspace(buf[i]); i++)
2169                        ; /* do nothing */
2170                return i;
2171        }
2172        return 0;
2173}
2174
2175static int section_name_is_ok(const char *name)
2176{
2177        /* Empty section names are bogus. */
2178        if (!*name)
2179                return 0;
2180
2181        /*
2182         * Before a dot, we must be alphanumeric or dash. After the first dot,
2183         * anything goes, so we can stop checking.
2184         */
2185        for (; *name && *name != '.'; name++)
2186                if (*name != '-' && !isalnum(*name))
2187                        return 0;
2188        return 1;
2189}
2190
2191/* if new_name == NULL, the section is removed instead */
2192int git_config_rename_section_in_file(const char *config_filename,
2193                                      const char *old_name, const char *new_name)
2194{
2195        int ret = 0, remove = 0;
2196        char *filename_buf = NULL;
2197        struct lock_file *lock;
2198        int out_fd;
2199        char buf[1024];
2200        FILE *config_file;
2201        struct stat st;
2202
2203        if (new_name && !section_name_is_ok(new_name)) {
2204                ret = error("invalid section name: %s", new_name);
2205                goto out;
2206        }
2207
2208        if (!config_filename)
2209                config_filename = filename_buf = git_pathdup("config");
2210
2211        lock = xcalloc(1, sizeof(struct lock_file));
2212        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2213        if (out_fd < 0) {
2214                ret = error("could not lock config file %s", config_filename);
2215                goto out;
2216        }
2217
2218        if (!(config_file = fopen(config_filename, "rb"))) {
2219                /* no config file means nothing to rename, no error */
2220                goto unlock_and_out;
2221        }
2222
2223        fstat(fileno(config_file), &st);
2224
2225        if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2226                ret = error("chmod on %s failed: %s",
2227                                lock->filename, strerror(errno));
2228                goto out;
2229        }
2230
2231        while (fgets(buf, sizeof(buf), config_file)) {
2232                int i;
2233                int length;
2234                char *output = buf;
2235                for (i = 0; buf[i] && isspace(buf[i]); i++)
2236                        ; /* do nothing */
2237                if (buf[i] == '[') {
2238                        /* it's a section */
2239                        int offset = section_name_match(&buf[i], old_name);
2240                        if (offset > 0) {
2241                                ret++;
2242                                if (new_name == NULL) {
2243                                        remove = 1;
2244                                        continue;
2245                                }
2246                                store.baselen = strlen(new_name);
2247                                if (!store_write_section(out_fd, new_name)) {
2248                                        ret = write_error(lock->filename);
2249                                        goto out;
2250                                }
2251                                /*
2252                                 * We wrote out the new section, with
2253                                 * a newline, now skip the old
2254                                 * section's length
2255                                 */
2256                                output += offset + i;
2257                                if (strlen(output) > 0) {
2258                                        /*
2259                                         * More content means there's
2260                                         * a declaration to put on the
2261                                         * next line; indent with a
2262                                         * tab
2263                                         */
2264                                        output -= 1;
2265                                        output[0] = '\t';
2266                                }
2267                        }
2268                        remove = 0;
2269                }
2270                if (remove)
2271                        continue;
2272                length = strlen(output);
2273                if (write_in_full(out_fd, output, length) != length) {
2274                        ret = write_error(lock->filename);
2275                        goto out;
2276                }
2277        }
2278        fclose(config_file);
2279unlock_and_out:
2280        if (commit_lock_file(lock) < 0)
2281                ret = error("could not commit config file %s", config_filename);
2282out:
2283        free(filename_buf);
2284        return ret;
2285}
2286
2287int git_config_rename_section(const char *old_name, const char *new_name)
2288{
2289        return git_config_rename_section_in_file(NULL, old_name, new_name);
2290}
2291
2292/*
2293 * Call this to report error for your variable that should not
2294 * get a boolean value (i.e. "[my] var" means "true").
2295 */
2296#undef config_error_nonbool
2297int config_error_nonbool(const char *var)
2298{
2299        return error("Missing value for '%s'", var);
2300}
2301
2302int parse_config_key(const char *var,
2303                     const char *section,
2304                     const char **subsection, int *subsection_len,
2305                     const char **key)
2306{
2307        int section_len = strlen(section);
2308        const char *dot;
2309
2310        /* Does it start with "section." ? */
2311        if (!starts_with(var, section) || var[section_len] != '.')
2312                return -1;
2313
2314        /*
2315         * Find the key; we don't know yet if we have a subsection, but we must
2316         * parse backwards from the end, since the subsection may have dots in
2317         * it, too.
2318         */
2319        dot = strrchr(var, '.');
2320        *key = dot + 1;
2321
2322        /* Did we have a subsection at all? */
2323        if (dot == var + section_len) {
2324                *subsection = NULL;
2325                *subsection_len = 0;
2326        }
2327        else {
2328                *subsection = var + section_len + 1;
2329                *subsection_len = dot - *subsection;
2330        }
2331
2332        return 0;
2333}