strbuf.c

   1 #include "cache.h"
   2 #include "refs.h"
   3
   4 int 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
  13 int 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  */
  27 char strbuf_slopbuf[1];
  28
  29 void 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
  37 void strbuf_release(struct strbuf *sb)
  38 {
  39         if (sb->alloc) {
  40                 free(sb->buf);
  41                 strbuf_init(sb, 0);
  42         }
  43 }
  44
  45 char *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
  56 void 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
  66 void 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
  79 void 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 }
  91 void 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
  98 void 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
 109 struct strbuf **strbuf_split_buf(const char *str, size_t slen, int delim, int max)
 110 {
 111         int alloc = 2, pos = 0;
 112         const char *n, *p;
 113         struct strbuf **ret;
 114         struct strbuf *t;
 115
 116         ret = xcalloc(alloc, sizeof(struct strbuf *));
 117         p = n = str;
 118         while (n < str + slen) {
 119                 int len;
 120                 if (max <= 0 || pos + 1 < max)
 121                         n = memchr(n, delim, slen - (n - str));
 122                 else
 123                         n = NULL;
 124                 if (pos + 1 >= alloc) {
 125                         alloc = alloc * 2;
 126                         ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 127                 }
 128                 if (!n)
 129                         n = str + slen - 1;
 130                 len = n - p + 1;
 131                 t = xmalloc(sizeof(struct strbuf));
 132                 strbuf_init(t, len);
 133                 strbuf_add(t, p, len);
 134                 ret[pos] = t;
 135                 ret[++pos] = NULL;
 136                 p = ++n;
 137         }
 138         return ret;
 139 }
 140
 141 void strbuf_list_free(struct strbuf **sbs)
 142 {
 143         struct strbuf **s = sbs;
 144
 145         while (*s) {
 146                 strbuf_release(*s);
 147                 free(*s++);
 148         }
 149         free(sbs);
 150 }
 151
 152 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 153 {
 154         int len = a->len < b->len ? a->len: b->len;
 155         int cmp = memcmp(a->buf, b->buf, len);
 156         if (cmp)
 157                 return cmp;
 158         return a->len < b->len ? -1: a->len != b->len;
 159 }
 160
 161 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 162                                    const void *data, size_t dlen)
 163 {
 164         if (unsigned_add_overflows(pos, len))
 165                 die("you want to use way too much memory");
 166         if (pos > sb->len)
 167                 die("`pos' is too far after the end of the buffer");
 168         if (pos + len > sb->len)
 169                 die("`pos + len' is too far after the end of the buffer");
 170
 171         if (dlen >= len)
 172                 strbuf_grow(sb, dlen - len);
 173         memmove(sb->buf + pos + dlen,
 174                         sb->buf + pos + len,
 175                         sb->len - pos - len);
 176         memcpy(sb->buf + pos, data, dlen);
 177         strbuf_setlen(sb, sb->len + dlen - len);
 178 }
 179
 180 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 181 {
 182         strbuf_splice(sb, pos, 0, data, len);
 183 }
 184
 185 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 186 {
 187         strbuf_splice(sb, pos, len, NULL, 0);
 188 }
 189
 190 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 191 {
 192         strbuf_grow(sb, len);
 193         memcpy(sb->buf + sb->len, data, len);
 194         strbuf_setlen(sb, sb->len + len);
 195 }
 196
 197 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 198 {
 199         strbuf_grow(sb, len);
 200         memcpy(sb->buf + sb->len, sb->buf + pos, len);
 201         strbuf_setlen(sb, sb->len + len);
 202 }
 203
 204 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 205 {
 206         va_list ap;
 207         va_start(ap, fmt);
 208         strbuf_vaddf(sb, fmt, ap);
 209         va_end(ap);
 210 }
 211
 212 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 213 {
 214         int len;
 215         va_list cp;
 216
 217         if (!strbuf_avail(sb))
 218                 strbuf_grow(sb, 64);
 219         va_copy(cp, ap);
 220         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 221         va_end(cp);
 222         if (len < 0)
 223                 die("BUG: your vsnprintf is broken (returned %d)", len);
 224         if (len > strbuf_avail(sb)) {
 225                 strbuf_grow(sb, len);
 226                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 227                 if (len > strbuf_avail(sb))
 228                         die("BUG: your vsnprintf is broken (insatiable)");
 229         }
 230         strbuf_setlen(sb, sb->len + len);
 231 }
 232
 233 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 234                    void *context)
 235 {
 236         for (;;) {
 237                 const char *percent;
 238                 size_t consumed;
 239
 240                 percent = strchrnul(format, '%');
 241                 strbuf_add(sb, format, percent - format);
 242                 if (!*percent)
 243                         break;
 244                 format = percent + 1;
 245
 246                 if (*format == '%') {
 247                         strbuf_addch(sb, '%');
 248                         format++;
 249                         continue;
 250                 }
 251
 252                 consumed = fn(sb, format, context);
 253                 if (consumed)
 254                         format += consumed;
 255                 else
 256                         strbuf_addch(sb, '%');
 257         }
 258 }
 259
 260 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 261                 void *context)
 262 {
 263         struct strbuf_expand_dict_entry *e = context;
 264         size_t len;
 265
 266         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 267                 if (!strncmp(placeholder, e->placeholder, len)) {
 268                         if (e->value)
 269                                 strbuf_addstr(sb, e->value);
 270                         return len;
 271                 }
 272         }
 273         return 0;
 274 }
 275
 276 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 277 {
 278         int i, len = src->len;
 279
 280         for (i = 0; i < len; i++) {
 281                 if (src->buf[i] == '%')
 282                         strbuf_addch(dst, '%');
 283                 strbuf_addch(dst, src->buf[i]);
 284         }
 285 }
 286
 287 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 288 {
 289         size_t res;
 290         size_t oldalloc = sb->alloc;
 291
 292         strbuf_grow(sb, size);
 293         res = fread(sb->buf + sb->len, 1, size, f);
 294         if (res > 0)
 295                 strbuf_setlen(sb, sb->len + res);
 296         else if (oldalloc == 0)
 297                 strbuf_release(sb);
 298         return res;
 299 }
 300
 301 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 302 {
 303         size_t oldlen = sb->len;
 304         size_t oldalloc = sb->alloc;
 305
 306         strbuf_grow(sb, hint ? hint : 8192);
 307         for (;;) {
 308                 ssize_t cnt;
 309
 310                 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 311                 if (cnt < 0) {
 312                         if (oldalloc == 0)
 313                                 strbuf_release(sb);
 314                         else
 315                                 strbuf_setlen(sb, oldlen);
 316                         return -1;
 317                 }
 318                 if (!cnt)
 319                         break;
 320                 sb->len += cnt;
 321                 strbuf_grow(sb, 8192);
 322         }
 323
 324         sb->buf[sb->len] = '\0';
 325         return sb->len - oldlen;
 326 }
 327
 328 #define STRBUF_MAXLINK (2*PATH_MAX)
 329
 330 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 331 {
 332         size_t oldalloc = sb->alloc;
 333
 334         if (hint < 32)
 335                 hint = 32;
 336
 337         while (hint < STRBUF_MAXLINK) {
 338                 int len;
 339
 340                 strbuf_grow(sb, hint);
 341                 len = readlink(path, sb->buf, hint);
 342                 if (len < 0) {
 343                         if (errno != ERANGE)
 344                                 break;
 345                 } else if (len < hint) {
 346                         strbuf_setlen(sb, len);
 347                         return 0;
 348                 }
 349
 350                 /* .. the buffer was too small - try again */
 351                 hint *= 2;
 352         }
 353         if (oldalloc == 0)
 354                 strbuf_release(sb);
 355         return -1;
 356 }
 357
 358 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 359 {
 360         int ch;
 361
 362         if (feof(fp))
 363                 return EOF;
 364
 365         strbuf_reset(sb);
 366         while ((ch = fgetc(fp)) != EOF) {
 367                 strbuf_grow(sb, 1);
 368                 sb->buf[sb->len++] = ch;
 369                 if (ch == term)
 370                         break;
 371         }
 372         if (ch == EOF && sb->len == 0)
 373                 return EOF;
 374
 375         sb->buf[sb->len] = '\0';
 376         return 0;
 377 }
 378
 379 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 380 {
 381         if (strbuf_getwholeline(sb, fp, term))
 382                 return EOF;
 383         if (sb->buf[sb->len-1] == term)
 384                 strbuf_setlen(sb, sb->len-1);
 385         return 0;
 386 }
 387
 388 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 389 {
 390         strbuf_reset(sb);
 391
 392         while (1) {
 393                 char ch;
 394                 ssize_t len = xread(fd, &ch, 1);
 395                 if (len <= 0)
 396                         return EOF;
 397                 strbuf_addch(sb, ch);
 398                 if (ch == term)
 399                         break;
 400         }
 401         return 0;
 402 }
 403
 404 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 405 {
 406         int fd, len;
 407
 408         fd = open(path, O_RDONLY);
 409         if (fd < 0)
 410                 return -1;
 411         len = strbuf_read(sb, fd, hint);
 412         close(fd);
 413         if (len < 0)
 414                 return -1;
 415
 416         return len;
 417 }
 418
 419 void strbuf_add_lines(struct strbuf *out, const char *prefix,
 420                       const char *buf, size_t size)
 421 {
 422         while (size) {
 423                 const char *next = memchr(buf, '\n', size);
 424                 next = next ? (next + 1) : (buf + size);
 425                 strbuf_addstr(out, prefix);
 426                 strbuf_add(out, buf, next - buf);
 427                 size -= next - buf;
 428                 buf = next;
 429         }
 430         strbuf_complete_line(out);
 431 }
 432
 433 static int is_rfc3986_reserved(char ch)
 434 {
 435         switch (ch) {
 436                 case '!': case '*': case '\'': case '(': case ')': case ';':
 437                 case ':': case '@': case '&': case '=': case '+': case '$':
 438                 case ',': case '/': case '?': case '#': case '[': case ']':
 439                         return 1;
 440         }
 441         return 0;
 442 }
 443
 444 static int is_rfc3986_unreserved(char ch)
 445 {
 446         return isalnum(ch) ||
 447                 ch == '-' || ch == '_' || ch == '.' || ch == '~';
 448 }
 449
 450 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 451                                  int reserved)
 452 {
 453         strbuf_grow(sb, len);
 454         while (len--) {
 455                 char ch = *s++;
 456                 if (is_rfc3986_unreserved(ch) ||
 457                     (!reserved && is_rfc3986_reserved(ch)))
 458                         strbuf_addch(sb, ch);
 459                 else
 460                         strbuf_addf(sb, "%%%02x", ch);
 461         }
 462 }
 463
 464 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 465                              int reserved)
 466 {
 467         strbuf_add_urlencode(sb, s, strlen(s), reserved);
 468 }
 469
 470 int printf_ln(const char *fmt, ...)
 471 {
 472         int ret;
 473         va_list ap;
 474         va_start(ap, fmt);
 475         ret = vprintf(fmt, ap);
 476         va_end(ap);
 477         if (ret < 0 || putchar('\n') == EOF)
 478                 return -1;
 479         return ret + 1;
 480 }
 481
 482 int fprintf_ln(FILE *fp, const char *fmt, ...)
 483 {
 484         int ret;
 485         va_list ap;
 486         va_start(ap, fmt);
 487         ret = vfprintf(fp, fmt, ap);
 488         va_end(ap);
 489         if (ret < 0 || putc('\n', fp) == EOF)
 490                 return -1;
 491         return ret + 1;
 492 }