Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit git-checkout.txt: spell out --no-option (d333f67)
   1#include "cache.h"
   2#include "refs.h"
   3#include "string-list.h"
   4#include "utf8.h"
   5
   6int starts_with(const char *str, const char *prefix)
   7{
   8        for (; ; str++, prefix++)
   9                if (!*prefix)
  10                        return 1;
  11                else if (*str != *prefix)
  12                        return 0;
  13}
  14
  15int istarts_with(const char *str, const char *prefix)
  16{
  17        for (; ; str++, prefix++)
  18                if (!*prefix)
  19                        return 1;
  20                else if (tolower(*str) != tolower(*prefix))
  21                        return 0;
  22}
  23
  24int skip_to_optional_arg_default(const char *str, const char *prefix,
  25                                 const char **arg, const char *def)
  26{
  27        const char *p;
  28
  29        if (!skip_prefix(str, prefix, &p))
  30                return 0;
  31
  32        if (!*p) {
  33                if (arg)
  34                        *arg = def;
  35                return 1;
  36        }
  37
  38        if (*p != '=')
  39                return 0;
  40
  41        if (arg)
  42                *arg = p + 1;
  43        return 1;
  44}
  45
  46/*
  47 * Used as the default ->buf value, so that people can always assume
  48 * buf is non NULL and ->buf is NUL terminated even for a freshly
  49 * initialized strbuf.
  50 */
  51char strbuf_slopbuf[1];
  52
  53void strbuf_init(struct strbuf *sb, size_t hint)
  54{
  55        sb->alloc = sb->len = 0;
  56        sb->buf = strbuf_slopbuf;
  57        if (hint)
  58                strbuf_grow(sb, hint);
  59}
  60
  61void strbuf_release(struct strbuf *sb)
  62{
  63        if (sb->alloc) {
  64                free(sb->buf);
  65                strbuf_init(sb, 0);
  66        }
  67}
  68
  69char *strbuf_detach(struct strbuf *sb, size_t *sz)
  70{
  71        char *res;
  72        strbuf_grow(sb, 0);
  73        res = sb->buf;
  74        if (sz)
  75                *sz = sb->len;
  76        strbuf_init(sb, 0);
  77        return res;
  78}
  79
  80void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  81{
  82        strbuf_release(sb);
  83        sb->buf   = buf;
  84        sb->len   = len;
  85        sb->alloc = alloc;
  86        strbuf_grow(sb, 0);
  87        sb->buf[sb->len] = '\0';
  88}
  89
  90void strbuf_grow(struct strbuf *sb, size_t extra)
  91{
  92        int new_buf = !sb->alloc;
  93        if (unsigned_add_overflows(extra, 1) ||
  94            unsigned_add_overflows(sb->len, extra + 1))
  95                die("you want to use way too much memory");
  96        if (new_buf)
  97                sb->buf = NULL;
  98        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  99        if (new_buf)
 100                sb->buf[0] = '\0';
 101}
 102
 103void strbuf_trim(struct strbuf *sb)
 104{
 105        strbuf_rtrim(sb);
 106        strbuf_ltrim(sb);
 107}
 108
 109void strbuf_rtrim(struct strbuf *sb)
 110{
 111        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
 112                sb->len--;
 113        sb->buf[sb->len] = '\0';
 114}
 115
 116void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
 117{
 118        while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
 119                sb->len--;
 120        sb->buf[sb->len] = '\0';
 121}
 122
 123void strbuf_trim_trailing_newline(struct strbuf *sb)
 124{
 125        if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
 126                if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
 127                        --sb->len;
 128                sb->buf[sb->len] = '\0';
 129        }
 130}
 131
 132void strbuf_ltrim(struct strbuf *sb)
 133{
 134        char *b = sb->buf;
 135        while (sb->len > 0 && isspace(*b)) {
 136                b++;
 137                sb->len--;
 138        }
 139        memmove(sb->buf, b, sb->len);
 140        sb->buf[sb->len] = '\0';
 141}
 142
 143int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
 144{
 145        char *out;
 146        size_t len;
 147
 148        if (same_encoding(from, to))
 149                return 0;
 150
 151        out = reencode_string_len(sb->buf, sb->len, to, from, &len);
 152        if (!out)
 153                return -1;
 154
 155        strbuf_attach(sb, out, len, len);
 156        return 0;
 157}
 158
 159void strbuf_tolower(struct strbuf *sb)
 160{
 161        char *p = sb->buf, *end = sb->buf + sb->len;
 162        for (; p < end; p++)
 163                *p = tolower(*p);
 164}
 165
 166struct strbuf **strbuf_split_buf(const char *str, size_t slen,
 167                                 int terminator, int max)
 168{
 169        struct strbuf **ret = NULL;
 170        size_t nr = 0, alloc = 0;
 171        struct strbuf *t;
 172
 173        while (slen) {
 174                int len = slen;
 175                if (max <= 0 || nr + 1 < max) {
 176                        const char *end = memchr(str, terminator, slen);
 177                        if (end)
 178                                len = end - str + 1;
 179                }
 180                t = xmalloc(sizeof(struct strbuf));
 181                strbuf_init(t, len);
 182                strbuf_add(t, str, len);
 183                ALLOC_GROW(ret, nr + 2, alloc);
 184                ret[nr++] = t;
 185                str += len;
 186                slen -= len;
 187        }
 188        ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
 189        ret[nr] = NULL;
 190        return ret;
 191}
 192
 193void strbuf_add_separated_string_list(struct strbuf *str,
 194                                      const char *sep,
 195                                      struct string_list *slist)
 196{
 197        struct string_list_item *item;
 198        int sep_needed = 0;
 199
 200        for_each_string_list_item(item, slist) {
 201                if (sep_needed)
 202                        strbuf_addstr(str, sep);
 203                strbuf_addstr(str, item->string);
 204                sep_needed = 1;
 205        }
 206}
 207
 208void strbuf_list_free(struct strbuf **sbs)
 209{
 210        struct strbuf **s = sbs;
 211
 212        while (*s) {
 213                strbuf_release(*s);
 214                free(*s++);
 215        }
 216        free(sbs);
 217}
 218
 219int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 220{
 221        size_t len = a->len < b->len ? a->len: b->len;
 222        int cmp = memcmp(a->buf, b->buf, len);
 223        if (cmp)
 224                return cmp;
 225        return a->len < b->len ? -1: a->len != b->len;
 226}
 227
 228void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 229                                   const void *data, size_t dlen)
 230{
 231        if (unsigned_add_overflows(pos, len))
 232                die("you want to use way too much memory");
 233        if (pos > sb->len)
 234                die("`pos' is too far after the end of the buffer");
 235        if (pos + len > sb->len)
 236                die("`pos + len' is too far after the end of the buffer");
 237
 238        if (dlen >= len)
 239                strbuf_grow(sb, dlen - len);
 240        memmove(sb->buf + pos + dlen,
 241                        sb->buf + pos + len,
 242                        sb->len - pos - len);
 243        memcpy(sb->buf + pos, data, dlen);
 244        strbuf_setlen(sb, sb->len + dlen - len);
 245}
 246
 247void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 248{
 249        strbuf_splice(sb, pos, 0, data, len);
 250}
 251
 252void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 253{
 254        strbuf_splice(sb, pos, len, "", 0);
 255}
 256
 257void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 258{
 259        strbuf_grow(sb, len);
 260        memcpy(sb->buf + sb->len, data, len);
 261        strbuf_setlen(sb, sb->len + len);
 262}
 263
 264void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 265{
 266        strbuf_grow(sb, sb2->len);
 267        memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
 268        strbuf_setlen(sb, sb->len + sb2->len);
 269}
 270
 271void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 272{
 273        strbuf_grow(sb, n);
 274        memset(sb->buf + sb->len, c, n);
 275        strbuf_setlen(sb, sb->len + n);
 276}
 277
 278void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 279{
 280        va_list ap;
 281        va_start(ap, fmt);
 282        strbuf_vaddf(sb, fmt, ap);
 283        va_end(ap);
 284}
 285
 286static void add_lines(struct strbuf *out,
 287                        const char *prefix1,
 288                        const char *prefix2,
 289                        const char *buf, size_t size)
 290{
 291        while (size) {
 292                const char *prefix;
 293                const char *next = memchr(buf, '\n', size);
 294                next = next ? (next + 1) : (buf + size);
 295
 296                prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
 297                          ? prefix2 : prefix1);
 298                strbuf_addstr(out, prefix);
 299                strbuf_add(out, buf, next - buf);
 300                size -= next - buf;
 301                buf = next;
 302        }
 303        strbuf_complete_line(out);
 304}
 305
 306void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
 307{
 308        static char prefix1[3];
 309        static char prefix2[2];
 310
 311        if (prefix1[0] != comment_line_char) {
 312                xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
 313                xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
 314        }
 315        add_lines(out, prefix1, prefix2, buf, size);
 316}
 317
 318void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
 319{
 320        va_list params;
 321        struct strbuf buf = STRBUF_INIT;
 322        int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
 323
 324        va_start(params, fmt);
 325        strbuf_vaddf(&buf, fmt, params);
 326        va_end(params);
 327
 328        strbuf_add_commented_lines(sb, buf.buf, buf.len);
 329        if (incomplete_line)
 330                sb->buf[--sb->len] = '\0';
 331
 332        strbuf_release(&buf);
 333}
 334
 335void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 336{
 337        int len;
 338        va_list cp;
 339
 340        if (!strbuf_avail(sb))
 341                strbuf_grow(sb, 64);
 342        va_copy(cp, ap);
 343        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 344        va_end(cp);
 345        if (len < 0)
 346                BUG("your vsnprintf is broken (returned %d)", len);
 347        if (len > strbuf_avail(sb)) {
 348                strbuf_grow(sb, len);
 349                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 350                if (len > strbuf_avail(sb))
 351                        BUG("your vsnprintf is broken (insatiable)");
 352        }
 353        strbuf_setlen(sb, sb->len + len);
 354}
 355
 356void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 357                   void *context)
 358{
 359        for (;;) {
 360                const char *percent;
 361                size_t consumed;
 362
 363                percent = strchrnul(format, '%');
 364                strbuf_add(sb, format, percent - format);
 365                if (!*percent)
 366                        break;
 367                format = percent + 1;
 368
 369                if (*format == '%') {
 370                        strbuf_addch(sb, '%');
 371                        format++;
 372                        continue;
 373                }
 374
 375                consumed = fn(sb, format, context);
 376                if (consumed)
 377                        format += consumed;
 378                else
 379                        strbuf_addch(sb, '%');
 380        }
 381}
 382
 383size_t strbuf_expand_literal_cb(struct strbuf *sb,
 384                                const char *placeholder,
 385                                void *context)
 386{
 387        int ch;
 388
 389        switch (placeholder[0]) {
 390        case 'n':               /* newline */
 391                strbuf_addch(sb, '\n');
 392                return 1;
 393        case 'x':
 394                /* %x00 == NUL, %x0a == LF, etc. */
 395                ch = hex2chr(placeholder + 1);
 396                if (ch < 0)
 397                        return 0;
 398                strbuf_addch(sb, ch);
 399                return 3;
 400        }
 401        return 0;
 402}
 403
 404size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 405                void *context)
 406{
 407        struct strbuf_expand_dict_entry *e = context;
 408        size_t len;
 409
 410        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 411                if (!strncmp(placeholder, e->placeholder, len)) {
 412                        if (e->value)
 413                                strbuf_addstr(sb, e->value);
 414                        return len;
 415                }
 416        }
 417        return 0;
 418}
 419
 420void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 421{
 422        size_t i, len = src->len;
 423
 424        for (i = 0; i < len; i++) {
 425                if (src->buf[i] == '%')
 426                        strbuf_addch(dst, '%');
 427                strbuf_addch(dst, src->buf[i]);
 428        }
 429}
 430
 431size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 432{
 433        size_t res;
 434        size_t oldalloc = sb->alloc;
 435
 436        strbuf_grow(sb, size);
 437        res = fread(sb->buf + sb->len, 1, size, f);
 438        if (res > 0)
 439                strbuf_setlen(sb, sb->len + res);
 440        else if (oldalloc == 0)
 441                strbuf_release(sb);
 442        return res;
 443}
 444
 445ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 446{
 447        size_t oldlen = sb->len;
 448        size_t oldalloc = sb->alloc;
 449
 450        strbuf_grow(sb, hint ? hint : 8192);
 451        for (;;) {
 452                ssize_t want = sb->alloc - sb->len - 1;
 453                ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
 454
 455                if (got < 0) {
 456                        if (oldalloc == 0)
 457                                strbuf_release(sb);
 458                        else
 459                                strbuf_setlen(sb, oldlen);
 460                        return -1;
 461                }
 462                sb->len += got;
 463                if (got < want)
 464                        break;
 465                strbuf_grow(sb, 8192);
 466        }
 467
 468        sb->buf[sb->len] = '\0';
 469        return sb->len - oldlen;
 470}
 471
 472ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 473{
 474        size_t oldalloc = sb->alloc;
 475        ssize_t cnt;
 476
 477        strbuf_grow(sb, hint ? hint : 8192);
 478        cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 479        if (cnt > 0)
 480                strbuf_setlen(sb, sb->len + cnt);
 481        else if (oldalloc == 0)
 482                strbuf_release(sb);
 483        return cnt;
 484}
 485
 486ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 487{
 488        return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 489}
 490
 491
 492#define STRBUF_MAXLINK (2*PATH_MAX)
 493
 494int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 495{
 496        size_t oldalloc = sb->alloc;
 497
 498        if (hint < 32)
 499                hint = 32;
 500
 501        while (hint < STRBUF_MAXLINK) {
 502                ssize_t len;
 503
 504                strbuf_grow(sb, hint);
 505                len = readlink(path, sb->buf, hint);
 506                if (len < 0) {
 507                        if (errno != ERANGE)
 508                                break;
 509                } else if (len < hint) {
 510                        strbuf_setlen(sb, len);
 511                        return 0;
 512                }
 513
 514                /* .. the buffer was too small - try again */
 515                hint *= 2;
 516        }
 517        if (oldalloc == 0)
 518                strbuf_release(sb);
 519        return -1;
 520}
 521
 522int strbuf_getcwd(struct strbuf *sb)
 523{
 524        size_t oldalloc = sb->alloc;
 525        size_t guessed_len = 128;
 526
 527        for (;; guessed_len *= 2) {
 528                strbuf_grow(sb, guessed_len);
 529                if (getcwd(sb->buf, sb->alloc)) {
 530                        strbuf_setlen(sb, strlen(sb->buf));
 531                        return 0;
 532                }
 533
 534                /*
 535                 * If getcwd(3) is implemented as a syscall that falls
 536                 * back to a regular lookup using readdir(3) etc. then
 537                 * we may be able to avoid EACCES by providing enough
 538                 * space to the syscall as it's not necessarily bound
 539                 * to the same restrictions as the fallback.
 540                 */
 541                if (errno == EACCES && guessed_len < PATH_MAX)
 542                        continue;
 543
 544                if (errno != ERANGE)
 545                        break;
 546        }
 547        if (oldalloc == 0)
 548                strbuf_release(sb);
 549        else
 550                strbuf_reset(sb);
 551        return -1;
 552}
 553
 554#ifdef HAVE_GETDELIM
 555int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 556{
 557        ssize_t r;
 558
 559        if (feof(fp))
 560                return EOF;
 561
 562        strbuf_reset(sb);
 563
 564        /* Translate slopbuf to NULL, as we cannot call realloc on it */
 565        if (!sb->alloc)
 566                sb->buf = NULL;
 567        errno = 0;
 568        r = getdelim(&sb->buf, &sb->alloc, term, fp);
 569
 570        if (r > 0) {
 571                sb->len = r;
 572                return 0;
 573        }
 574        assert(r == -1);
 575
 576        /*
 577         * Normally we would have called xrealloc, which will try to free
 578         * memory and recover. But we have no way to tell getdelim() to do so.
 579         * Worse, we cannot try to recover ENOMEM ourselves, because we have
 580         * no idea how many bytes were read by getdelim.
 581         *
 582         * Dying here is reasonable. It mirrors what xrealloc would do on
 583         * catastrophic memory failure. We skip the opportunity to free pack
 584         * memory and retry, but that's unlikely to help for a malloc small
 585         * enough to hold a single line of input, anyway.
 586         */
 587        if (errno == ENOMEM)
 588                die("Out of memory, getdelim failed");
 589
 590        /*
 591         * Restore strbuf invariants; if getdelim left us with a NULL pointer,
 592         * we can just re-init, but otherwise we should make sure that our
 593         * length is empty, and that the result is NUL-terminated.
 594         */
 595        if (!sb->buf)
 596                strbuf_init(sb, 0);
 597        else
 598                strbuf_reset(sb);
 599        return EOF;
 600}
 601#else
 602int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 603{
 604        int ch;
 605
 606        if (feof(fp))
 607                return EOF;
 608
 609        strbuf_reset(sb);
 610        flockfile(fp);
 611        while ((ch = getc_unlocked(fp)) != EOF) {
 612                if (!strbuf_avail(sb))
 613                        strbuf_grow(sb, 1);
 614                sb->buf[sb->len++] = ch;
 615                if (ch == term)
 616                        break;
 617        }
 618        funlockfile(fp);
 619        if (ch == EOF && sb->len == 0)
 620                return EOF;
 621
 622        sb->buf[sb->len] = '\0';
 623        return 0;
 624}
 625#endif
 626
 627static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
 628{
 629        if (strbuf_getwholeline(sb, fp, term))
 630                return EOF;
 631        if (sb->buf[sb->len - 1] == term)
 632                strbuf_setlen(sb, sb->len - 1);
 633        return 0;
 634}
 635
 636int strbuf_getline(struct strbuf *sb, FILE *fp)
 637{
 638        if (strbuf_getwholeline(sb, fp, '\n'))
 639                return EOF;
 640        if (sb->buf[sb->len - 1] == '\n') {
 641                strbuf_setlen(sb, sb->len - 1);
 642                if (sb->len && sb->buf[sb->len - 1] == '\r')
 643                        strbuf_setlen(sb, sb->len - 1);
 644        }
 645        return 0;
 646}
 647
 648int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 649{
 650        return strbuf_getdelim(sb, fp, '\n');
 651}
 652
 653int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 654{
 655        return strbuf_getdelim(sb, fp, '\0');
 656}
 657
 658int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 659{
 660        strbuf_reset(sb);
 661
 662        while (1) {
 663                char ch;
 664                ssize_t len = xread(fd, &ch, 1);
 665                if (len <= 0)
 666                        return EOF;
 667                strbuf_addch(sb, ch);
 668                if (ch == term)
 669                        break;
 670        }
 671        return 0;
 672}
 673
 674ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 675{
 676        int fd;
 677        ssize_t len;
 678        int saved_errno;
 679
 680        fd = open(path, O_RDONLY);
 681        if (fd < 0)
 682                return -1;
 683        len = strbuf_read(sb, fd, hint);
 684        saved_errno = errno;
 685        close(fd);
 686        if (len < 0) {
 687                errno = saved_errno;
 688                return -1;
 689        }
 690
 691        return len;
 692}
 693
 694void strbuf_add_lines(struct strbuf *out, const char *prefix,
 695                      const char *buf, size_t size)
 696{
 697        add_lines(out, prefix, NULL, buf, size);
 698}
 699
 700void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
 701{
 702        while (*s) {
 703                size_t len = strcspn(s, "\"<>&");
 704                strbuf_add(buf, s, len);
 705                s += len;
 706                switch (*s) {
 707                case '"':
 708                        strbuf_addstr(buf, "&quot;");
 709                        break;
 710                case '<':
 711                        strbuf_addstr(buf, "&lt;");
 712                        break;
 713                case '>':
 714                        strbuf_addstr(buf, "&gt;");
 715                        break;
 716                case '&':
 717                        strbuf_addstr(buf, "&amp;");
 718                        break;
 719                case 0:
 720                        return;
 721                }
 722                s++;
 723        }
 724}
 725
 726static int is_rfc3986_reserved(char ch)
 727{
 728        switch (ch) {
 729                case '!': case '*': case '\'': case '(': case ')': case ';':
 730                case ':': case '@': case '&': case '=': case '+': case '$':
 731                case ',': case '/': case '?': case '#': case '[': case ']':
 732                        return 1;
 733        }
 734        return 0;
 735}
 736
 737static int is_rfc3986_unreserved(char ch)
 738{
 739        return isalnum(ch) ||
 740                ch == '-' || ch == '_' || ch == '.' || ch == '~';
 741}
 742
 743static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 744                                 int reserved)
 745{
 746        strbuf_grow(sb, len);
 747        while (len--) {
 748                char ch = *s++;
 749                if (is_rfc3986_unreserved(ch) ||
 750                    (!reserved && is_rfc3986_reserved(ch)))
 751                        strbuf_addch(sb, ch);
 752                else
 753                        strbuf_addf(sb, "%%%02x", (unsigned char)ch);
 754        }
 755}
 756
 757void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 758                             int reserved)
 759{
 760        strbuf_add_urlencode(sb, s, strlen(s), reserved);
 761}
 762
 763void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
 764{
 765        if (bytes > 1 << 30) {
 766                strbuf_addf(buf, "%u.%2.2u GiB",
 767                            (unsigned)(bytes >> 30),
 768                            (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
 769        } else if (bytes > 1 << 20) {
 770                unsigned x = bytes + 5243;  /* for rounding */
 771                strbuf_addf(buf, "%u.%2.2u MiB",
 772                            x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 773        } else if (bytes > 1 << 10) {
 774                unsigned x = bytes + 5;  /* for rounding */
 775                strbuf_addf(buf, "%u.%2.2u KiB",
 776                            x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 777        } else {
 778                strbuf_addf(buf, "%u bytes", (unsigned)bytes);
 779        }
 780}
 781
 782void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
 783{
 784        if (!*path)
 785                die("The empty string is not a valid path");
 786        if (!is_absolute_path(path)) {
 787                struct stat cwd_stat, pwd_stat;
 788                size_t orig_len = sb->len;
 789                char *cwd = xgetcwd();
 790                char *pwd = getenv("PWD");
 791                if (pwd && strcmp(pwd, cwd) &&
 792                    !stat(cwd, &cwd_stat) &&
 793                    (cwd_stat.st_dev || cwd_stat.st_ino) &&
 794                    !stat(pwd, &pwd_stat) &&
 795                    pwd_stat.st_dev == cwd_stat.st_dev &&
 796                    pwd_stat.st_ino == cwd_stat.st_ino)
 797                        strbuf_addstr(sb, pwd);
 798                else
 799                        strbuf_addstr(sb, cwd);
 800                if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
 801                        strbuf_addch(sb, '/');
 802                free(cwd);
 803        }
 804        strbuf_addstr(sb, path);
 805}
 806
 807void strbuf_add_real_path(struct strbuf *sb, const char *path)
 808{
 809        if (sb->len) {
 810                struct strbuf resolved = STRBUF_INIT;
 811                strbuf_realpath(&resolved, path, 1);
 812                strbuf_addbuf(sb, &resolved);
 813                strbuf_release(&resolved);
 814        } else
 815                strbuf_realpath(sb, path, 1);
 816}
 817
 818int printf_ln(const char *fmt, ...)
 819{
 820        int ret;
 821        va_list ap;
 822        va_start(ap, fmt);
 823        ret = vprintf(fmt, ap);
 824        va_end(ap);
 825        if (ret < 0 || putchar('\n') == EOF)
 826                return -1;
 827        return ret + 1;
 828}
 829
 830int fprintf_ln(FILE *fp, const char *fmt, ...)
 831{
 832        int ret;
 833        va_list ap;
 834        va_start(ap, fmt);
 835        ret = vfprintf(fp, fmt, ap);
 836        va_end(ap);
 837        if (ret < 0 || putc('\n', fp) == EOF)
 838                return -1;
 839        return ret + 1;
 840}
 841
 842char *xstrdup_tolower(const char *string)
 843{
 844        char *result;
 845        size_t len, i;
 846
 847        len = strlen(string);
 848        result = xmallocz(len);
 849        for (i = 0; i < len; i++)
 850                result[i] = tolower(string[i]);
 851        return result;
 852}
 853
 854char *xstrdup_toupper(const char *string)
 855{
 856        char *result;
 857        size_t len, i;
 858
 859        len = strlen(string);
 860        result = xmallocz(len);
 861        for (i = 0; i < len; i++)
 862                result[i] = toupper(string[i]);
 863        return result;
 864}
 865
 866char *xstrvfmt(const char *fmt, va_list ap)
 867{
 868        struct strbuf buf = STRBUF_INIT;
 869        strbuf_vaddf(&buf, fmt, ap);
 870        return strbuf_detach(&buf, NULL);
 871}
 872
 873char *xstrfmt(const char *fmt, ...)
 874{
 875        va_list ap;
 876        char *ret;
 877
 878        va_start(ap, fmt);
 879        ret = xstrvfmt(fmt, ap);
 880        va_end(ap);
 881
 882        return ret;
 883}
 884
 885void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 886                     int tz_offset, int suppress_tz_name)
 887{
 888        struct strbuf munged_fmt = STRBUF_INIT;
 889        size_t hint = 128;
 890        size_t len;
 891
 892        if (!*fmt)
 893                return;
 894
 895        /*
 896         * There is no portable way to pass timezone information to
 897         * strftime, so we handle %z and %Z here.
 898         */
 899        for (;;) {
 900                const char *percent = strchrnul(fmt, '%');
 901                strbuf_add(&munged_fmt, fmt, percent - fmt);
 902                if (!*percent)
 903                        break;
 904                fmt = percent + 1;
 905                switch (*fmt) {
 906                case '%':
 907                        strbuf_addstr(&munged_fmt, "%%");
 908                        fmt++;
 909                        break;
 910                case 'z':
 911                        strbuf_addf(&munged_fmt, "%+05d", tz_offset);
 912                        fmt++;
 913                        break;
 914                case 'Z':
 915                        if (suppress_tz_name) {
 916                                fmt++;
 917                                break;
 918                        }
 919                        /* FALLTHROUGH */
 920                default:
 921                        strbuf_addch(&munged_fmt, '%');
 922                }
 923        }
 924        fmt = munged_fmt.buf;
 925
 926        strbuf_grow(sb, hint);
 927        len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
 928
 929        if (!len) {
 930                /*
 931                 * strftime reports "0" if it could not fit the result in the buffer.
 932                 * Unfortunately, it also reports "0" if the requested time string
 933                 * takes 0 bytes. So our strategy is to munge the format so that the
 934                 * output contains at least one character, and then drop the extra
 935                 * character before returning.
 936                 */
 937                strbuf_addch(&munged_fmt, ' ');
 938                while (!len) {
 939                        hint *= 2;
 940                        strbuf_grow(sb, hint);
 941                        len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
 942                                       munged_fmt.buf, tm);
 943                }
 944                len--; /* drop munged space */
 945        }
 946        strbuf_release(&munged_fmt);
 947        strbuf_setlen(sb, sb->len + len);
 948}
 949
 950void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 951                              int abbrev_len)
 952{
 953        int r;
 954        strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
 955        r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
 956        strbuf_setlen(sb, sb->len + r);
 957}
 958
 959/*
 960 * Returns the length of a line, without trailing spaces.
 961 *
 962 * If the line ends with newline, it will be removed too.
 963 */
 964static size_t cleanup(char *line, size_t len)
 965{
 966        while (len) {
 967                unsigned char c = line[len - 1];
 968                if (!isspace(c))
 969                        break;
 970                len--;
 971        }
 972
 973        return len;
 974}
 975
 976/*
 977 * Remove empty lines from the beginning and end
 978 * and also trailing spaces from every line.
 979 *
 980 * Turn multiple consecutive empty lines between paragraphs
 981 * into just one empty line.
 982 *
 983 * If the input has only empty lines and spaces,
 984 * no output will be produced.
 985 *
 986 * If last line does not have a newline at the end, one is added.
 987 *
 988 * Enable skip_comments to skip every line starting with comment
 989 * character.
 990 */
 991void strbuf_stripspace(struct strbuf *sb, int skip_comments)
 992{
 993        size_t empties = 0;
 994        size_t i, j, len, newlen;
 995        char *eol;
 996
 997        /* We may have to add a newline. */
 998        strbuf_grow(sb, 1);
 999
1000        for (i = j = 0; i < sb->len; i += len, j += newlen) {
1001                eol = memchr(sb->buf + i, '\n', sb->len - i);
1002                len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
1003
1004                if (skip_comments && len && sb->buf[i] == comment_line_char) {
1005                        newlen = 0;
1006                        continue;
1007                }
1008                newlen = cleanup(sb->buf + i, len);
1009
1010                /* Not just an empty line? */
1011                if (newlen) {
1012                        if (empties > 0 && j > 0)
1013                                sb->buf[j++] = '\n';
1014                        empties = 0;
1015                        memmove(sb->buf + j, sb->buf + i, newlen);
1016                        sb->buf[newlen + j++] = '\n';
1017                } else {
1018                        empties++;
1019                }
1020        }
1021
1022        strbuf_setlen(sb, j);
1023}
1024
1025int strbuf_normalize_path(struct strbuf *src)
1026{
1027        struct strbuf dst = STRBUF_INIT;
1028
1029        strbuf_grow(&dst, src->len);
1030        if (normalize_path_copy(dst.buf, src->buf) < 0) {
1031                strbuf_release(&dst);
1032                return -1;
1033        }
1034
1035        /*
1036         * normalize_path does not tell us the new length, so we have to
1037         * compute it by looking for the new NUL it placed
1038         */
1039        strbuf_setlen(&dst, strlen(dst.buf));
1040        strbuf_swap(src, &dst);
1041        strbuf_release(&dst);
1042        return 0;
1043}