Andrew's git - gitweb.git/blob

c7cd529b3b46e2ea0fc58f2bad89a290cf4e5546
   1#include "cache.h"
   2#include "refs.h"
   3
   4int prefixcmp(const char *str, const char *prefix)
   5{
   6        for (; ; str++, prefix++)
   7                if (!*prefix)
   8                        return 0;
   9                else if (*str != *prefix)
  10                        return (unsigned char)*prefix - (unsigned char)*str;
  11}
  12
  13int suffixcmp(const char *str, const char *suffix)
  14{
  15        int len = strlen(str), suflen = strlen(suffix);
  16        if (len < suflen)
  17                return -1;
  18        else
  19                return strcmp(str + len - suflen, suffix);
  20}
  21
  22/*
  23 * Used as the default ->buf value, so that people can always assume
  24 * buf is non NULL and ->buf is NUL terminated even for a freshly
  25 * initialized strbuf.
  26 */
  27char strbuf_slopbuf[1];
  28
  29void strbuf_init(struct strbuf *sb, size_t hint)
  30{
  31        sb->alloc = sb->len = 0;
  32        sb->buf = strbuf_slopbuf;
  33        if (hint)
  34                strbuf_grow(sb, hint);
  35}
  36
  37void strbuf_release(struct strbuf *sb)
  38{
  39        if (sb->alloc) {
  40                free(sb->buf);
  41                strbuf_init(sb, 0);
  42        }
  43}
  44
  45char *strbuf_detach(struct strbuf *sb, size_t *sz)
  46{
  47        char *res;
  48        strbuf_grow(sb, 0);
  49        res = sb->buf;
  50        if (sz)
  51                *sz = sb->len;
  52        strbuf_init(sb, 0);
  53        return res;
  54}
  55
  56void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  57{
  58        strbuf_release(sb);
  59        sb->buf   = buf;
  60        sb->len   = len;
  61        sb->alloc = alloc;
  62        strbuf_grow(sb, 0);
  63        sb->buf[sb->len] = '\0';
  64}
  65
  66void strbuf_grow(struct strbuf *sb, size_t extra)
  67{
  68        int new_buf = !sb->alloc;
  69        if (unsigned_add_overflows(extra, 1) ||
  70            unsigned_add_overflows(sb->len, extra + 1))
  71                die("you want to use way too much memory");
  72        if (new_buf)
  73                sb->buf = NULL;
  74        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  75        if (new_buf)
  76                sb->buf[0] = '\0';
  77}
  78
  79void strbuf_trim(struct strbuf *sb)
  80{
  81        char *b = sb->buf;
  82        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  83                sb->len--;
  84        while (sb->len > 0 && isspace(*b)) {
  85                b++;
  86                sb->len--;
  87        }
  88        memmove(sb->buf, b, sb->len);
  89        sb->buf[sb->len] = '\0';
  90}
  91void strbuf_rtrim(struct strbuf *sb)
  92{
  93        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  94                sb->len--;
  95        sb->buf[sb->len] = '\0';
  96}
  97
  98void strbuf_ltrim(struct strbuf *sb)
  99{
 100        char *b = sb->buf;
 101        while (sb->len > 0 && isspace(*b)) {
 102                b++;
 103                sb->len--;
 104        }
 105        memmove(sb->buf, b, sb->len);
 106        sb->buf[sb->len] = '\0';
 107}
 108
 109struct strbuf **strbuf_split_buf(const char *str, size_t slen, int delim, int max)
 110{
 111        struct strbuf **ret = NULL;
 112        size_t nr = 0, alloc = 0;
 113        struct strbuf *t;
 114
 115        while (slen) {
 116                int len = slen;
 117                if (max <= 0 || nr + 1 < max) {
 118                        const char *end = memchr(str, delim, slen);
 119                        if (end)
 120                                len = end - str + 1;
 121                }
 122                t = xmalloc(sizeof(struct strbuf));
 123                strbuf_init(t, len);
 124                strbuf_add(t, str, len);
 125                ALLOC_GROW(ret, nr + 2, alloc);
 126                ret[nr++] = t;
 127                str += len;
 128                slen -= len;
 129        }
 130        ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
 131        ret[nr] = NULL;
 132        return ret;
 133}
 134
 135void strbuf_list_free(struct strbuf **sbs)
 136{
 137        struct strbuf **s = sbs;
 138
 139        while (*s) {
 140                strbuf_release(*s);
 141                free(*s++);
 142        }
 143        free(sbs);
 144}
 145
 146int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 147{
 148        int len = a->len < b->len ? a->len: b->len;
 149        int cmp = memcmp(a->buf, b->buf, len);
 150        if (cmp)
 151                return cmp;
 152        return a->len < b->len ? -1: a->len != b->len;
 153}
 154
 155void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 156                                   const void *data, size_t dlen)
 157{
 158        if (unsigned_add_overflows(pos, len))
 159                die("you want to use way too much memory");
 160        if (pos > sb->len)
 161                die("`pos' is too far after the end of the buffer");
 162        if (pos + len > sb->len)
 163                die("`pos + len' is too far after the end of the buffer");
 164
 165        if (dlen >= len)
 166                strbuf_grow(sb, dlen - len);
 167        memmove(sb->buf + pos + dlen,
 168                        sb->buf + pos + len,
 169                        sb->len - pos - len);
 170        memcpy(sb->buf + pos, data, dlen);
 171        strbuf_setlen(sb, sb->len + dlen - len);
 172}
 173
 174void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 175{
 176        strbuf_splice(sb, pos, 0, data, len);
 177}
 178
 179void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 180{
 181        strbuf_splice(sb, pos, len, NULL, 0);
 182}
 183
 184void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 185{
 186        strbuf_grow(sb, len);
 187        memcpy(sb->buf + sb->len, data, len);
 188        strbuf_setlen(sb, sb->len + len);
 189}
 190
 191void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 192{
 193        strbuf_grow(sb, len);
 194        memcpy(sb->buf + sb->len, sb->buf + pos, len);
 195        strbuf_setlen(sb, sb->len + len);
 196}
 197
 198void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 199{
 200        va_list ap;
 201        va_start(ap, fmt);
 202        strbuf_vaddf(sb, fmt, ap);
 203        va_end(ap);
 204}
 205
 206void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 207{
 208        int len;
 209        va_list cp;
 210
 211        if (!strbuf_avail(sb))
 212                strbuf_grow(sb, 64);
 213        va_copy(cp, ap);
 214        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 215        va_end(cp);
 216        if (len < 0)
 217                die("BUG: your vsnprintf is broken (returned %d)", len);
 218        if (len > strbuf_avail(sb)) {
 219                strbuf_grow(sb, len);
 220                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 221                if (len > strbuf_avail(sb))
 222                        die("BUG: your vsnprintf is broken (insatiable)");
 223        }
 224        strbuf_setlen(sb, sb->len + len);
 225}
 226
 227void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 228                   void *context)
 229{
 230        for (;;) {
 231                const char *percent;
 232                size_t consumed;
 233
 234                percent = strchrnul(format, '%');
 235                strbuf_add(sb, format, percent - format);
 236                if (!*percent)
 237                        break;
 238                format = percent + 1;
 239
 240                if (*format == '%') {
 241                        strbuf_addch(sb, '%');
 242                        format++;
 243                        continue;
 244                }
 245
 246                consumed = fn(sb, format, context);
 247                if (consumed)
 248                        format += consumed;
 249                else
 250                        strbuf_addch(sb, '%');
 251        }
 252}
 253
 254size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 255                void *context)
 256{
 257        struct strbuf_expand_dict_entry *e = context;
 258        size_t len;
 259
 260        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 261                if (!strncmp(placeholder, e->placeholder, len)) {
 262                        if (e->value)
 263                                strbuf_addstr(sb, e->value);
 264                        return len;
 265                }
 266        }
 267        return 0;
 268}
 269
 270void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 271{
 272        int i, len = src->len;
 273
 274        for (i = 0; i < len; i++) {
 275                if (src->buf[i] == '%')
 276                        strbuf_addch(dst, '%');
 277                strbuf_addch(dst, src->buf[i]);
 278        }
 279}
 280
 281size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 282{
 283        size_t res;
 284        size_t oldalloc = sb->alloc;
 285
 286        strbuf_grow(sb, size);
 287        res = fread(sb->buf + sb->len, 1, size, f);
 288        if (res > 0)
 289                strbuf_setlen(sb, sb->len + res);
 290        else if (oldalloc == 0)
 291                strbuf_release(sb);
 292        return res;
 293}
 294
 295ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 296{
 297        size_t oldlen = sb->len;
 298        size_t oldalloc = sb->alloc;
 299
 300        strbuf_grow(sb, hint ? hint : 8192);
 301        for (;;) {
 302                ssize_t cnt;
 303
 304                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 305                if (cnt < 0) {
 306                        if (oldalloc == 0)
 307                                strbuf_release(sb);
 308                        else
 309                                strbuf_setlen(sb, oldlen);
 310                        return -1;
 311                }
 312                if (!cnt)
 313                        break;
 314                sb->len += cnt;
 315                strbuf_grow(sb, 8192);
 316        }
 317
 318        sb->buf[sb->len] = '\0';
 319        return sb->len - oldlen;
 320}
 321
 322#define STRBUF_MAXLINK (2*PATH_MAX)
 323
 324int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 325{
 326        size_t oldalloc = sb->alloc;
 327
 328        if (hint < 32)
 329                hint = 32;
 330
 331        while (hint < STRBUF_MAXLINK) {
 332                int len;
 333
 334                strbuf_grow(sb, hint);
 335                len = readlink(path, sb->buf, hint);
 336                if (len < 0) {
 337                        if (errno != ERANGE)
 338                                break;
 339                } else if (len < hint) {
 340                        strbuf_setlen(sb, len);
 341                        return 0;
 342                }
 343
 344                /* .. the buffer was too small - try again */
 345                hint *= 2;
 346        }
 347        if (oldalloc == 0)
 348                strbuf_release(sb);
 349        return -1;
 350}
 351
 352int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 353{
 354        int ch;
 355
 356        if (feof(fp))
 357                return EOF;
 358
 359        strbuf_reset(sb);
 360        while ((ch = fgetc(fp)) != EOF) {
 361                strbuf_grow(sb, 1);
 362                sb->buf[sb->len++] = ch;
 363                if (ch == term)
 364                        break;
 365        }
 366        if (ch == EOF && sb->len == 0)
 367                return EOF;
 368
 369        sb->buf[sb->len] = '\0';
 370        return 0;
 371}
 372
 373int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 374{
 375        if (strbuf_getwholeline(sb, fp, term))
 376                return EOF;
 377        if (sb->buf[sb->len-1] == term)
 378                strbuf_setlen(sb, sb->len-1);
 379        return 0;
 380}
 381
 382int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 383{
 384        strbuf_reset(sb);
 385
 386        while (1) {
 387                char ch;
 388                ssize_t len = xread(fd, &ch, 1);
 389                if (len <= 0)
 390                        return EOF;
 391                strbuf_addch(sb, ch);
 392                if (ch == term)
 393                        break;
 394        }
 395        return 0;
 396}
 397
 398int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 399{
 400        int fd, len;
 401
 402        fd = open(path, O_RDONLY);
 403        if (fd < 0)
 404                return -1;
 405        len = strbuf_read(sb, fd, hint);
 406        close(fd);
 407        if (len < 0)
 408                return -1;
 409
 410        return len;
 411}
 412
 413void strbuf_add_lines(struct strbuf *out, const char *prefix,
 414                      const char *buf, size_t size)
 415{
 416        while (size) {
 417                const char *next = memchr(buf, '\n', size);
 418                next = next ? (next + 1) : (buf + size);
 419                strbuf_addstr(out, prefix);
 420                strbuf_add(out, buf, next - buf);
 421                size -= next - buf;
 422                buf = next;
 423        }
 424        strbuf_complete_line(out);
 425}
 426
 427static int is_rfc3986_reserved(char ch)
 428{
 429        switch (ch) {
 430                case '!': case '*': case '\'': case '(': case ')': case ';':
 431                case ':': case '@': case '&': case '=': case '+': case '$':
 432                case ',': case '/': case '?': case '#': case '[': case ']':
 433                        return 1;
 434        }
 435        return 0;
 436}
 437
 438static int is_rfc3986_unreserved(char ch)
 439{
 440        return isalnum(ch) ||
 441                ch == '-' || ch == '_' || ch == '.' || ch == '~';
 442}
 443
 444static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 445                                 int reserved)
 446{
 447        strbuf_grow(sb, len);
 448        while (len--) {
 449                char ch = *s++;
 450                if (is_rfc3986_unreserved(ch) ||
 451                    (!reserved && is_rfc3986_reserved(ch)))
 452                        strbuf_addch(sb, ch);
 453                else
 454                        strbuf_addf(sb, "%%%02x", ch);
 455        }
 456}
 457
 458void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 459                             int reserved)
 460{
 461        strbuf_add_urlencode(sb, s, strlen(s), reserved);
 462}
 463
 464int printf_ln(const char *fmt, ...)
 465{
 466        int ret;
 467        va_list ap;
 468        va_start(ap, fmt);
 469        ret = vprintf(fmt, ap);
 470        va_end(ap);
 471        if (ret < 0 || putchar('\n') == EOF)
 472                return -1;
 473        return ret + 1;
 474}
 475
 476int fprintf_ln(FILE *fp, const char *fmt, ...)
 477{
 478        int ret;
 479        va_list ap;
 480        va_start(ap, fmt);
 481        ret = vfprintf(fp, fmt, ap);
 482        va_end(ap);
 483        if (ret < 0 || putc('\n', fp) == EOF)
 484                return -1;
 485        return ret + 1;
 486}