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 = sb->alloc ? sb->buf : NULL;
  48         if (sz)
  49                 *sz = sb->len;
  50         strbuf_init(sb, 0);
  51         return res;
  52 }
  53
  54 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  55 {
  56         strbuf_release(sb);
  57         sb->buf   = buf;
  58         sb->len   = len;
  59         sb->alloc = alloc;
  60         strbuf_grow(sb, 0);
  61         sb->buf[sb->len] = '\0';
  62 }
  63
  64 void strbuf_grow(struct strbuf *sb, size_t extra)
  65 {
  66         if (sb->len + extra + 1 <= sb->len)
  67                 die("you want to use way too much memory");
  68         if (!sb->alloc)
  69                 sb->buf = NULL;
  70         ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  71 }
  72
  73 void strbuf_trim(struct strbuf *sb)
  74 {
  75         char *b = sb->buf;
  76         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  77                 sb->len--;
  78         while (sb->len > 0 && isspace(*b)) {
  79                 b++;
  80                 sb->len--;
  81         }
  82         memmove(sb->buf, b, sb->len);
  83         sb->buf[sb->len] = '\0';
  84 }
  85 void strbuf_rtrim(struct strbuf *sb)
  86 {
  87         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  88                 sb->len--;
  89         sb->buf[sb->len] = '\0';
  90 }
  91
  92 void strbuf_ltrim(struct strbuf *sb)
  93 {
  94         char *b = sb->buf;
  95         while (sb->len > 0 && isspace(*b)) {
  96                 b++;
  97                 sb->len--;
  98         }
  99         memmove(sb->buf, b, sb->len);
 100         sb->buf[sb->len] = '\0';
 101 }
 102
 103 struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
 104 {
 105         int alloc = 2, pos = 0;
 106         char *n, *p;
 107         struct strbuf **ret;
 108         struct strbuf *t;
 109
 110         ret = xcalloc(alloc, sizeof(struct strbuf *));
 111         p = n = sb->buf;
 112         while (n < sb->buf + sb->len) {
 113                 int len;
 114                 n = memchr(n, delim, sb->len - (n - sb->buf));
 115                 if (pos + 1 >= alloc) {
 116                         alloc = alloc * 2;
 117                         ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 118                 }
 119                 if (!n)
 120                         n = sb->buf + sb->len - 1;
 121                 len = n - p + 1;
 122                 t = xmalloc(sizeof(struct strbuf));
 123                 strbuf_init(t, len);
 124                 strbuf_add(t, p, len);
 125                 ret[pos] = t;
 126                 ret[++pos] = NULL;
 127                 p = ++n;
 128         }
 129         return ret;
 130 }
 131
 132 void strbuf_list_free(struct strbuf **sbs)
 133 {
 134         struct strbuf **s = sbs;
 135
 136         while (*s) {
 137                 strbuf_release(*s);
 138                 free(*s++);
 139         }
 140         free(sbs);
 141 }
 142
 143 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 144 {
 145         int len = a->len < b->len ? a->len: b->len;
 146         int cmp = memcmp(a->buf, b->buf, len);
 147         if (cmp)
 148                 return cmp;
 149         return a->len < b->len ? -1: a->len != b->len;
 150 }
 151
 152 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 153                                    const void *data, size_t dlen)
 154 {
 155         if (pos + len < pos)
 156                 die("you want to use way too much memory");
 157         if (pos > sb->len)
 158                 die("`pos' is too far after the end of the buffer");
 159         if (pos + len > sb->len)
 160                 die("`pos + len' is too far after the end of the buffer");
 161
 162         if (dlen >= len)
 163                 strbuf_grow(sb, dlen - len);
 164         memmove(sb->buf + pos + dlen,
 165                         sb->buf + pos + len,
 166                         sb->len - pos - len);
 167         memcpy(sb->buf + pos, data, dlen);
 168         strbuf_setlen(sb, sb->len + dlen - len);
 169 }
 170
 171 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 172 {
 173         strbuf_splice(sb, pos, 0, data, len);
 174 }
 175
 176 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 177 {
 178         strbuf_splice(sb, pos, len, NULL, 0);
 179 }
 180
 181 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 182 {
 183         strbuf_grow(sb, len);
 184         memcpy(sb->buf + sb->len, data, len);
 185         strbuf_setlen(sb, sb->len + len);
 186 }
 187
 188 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 189 {
 190         strbuf_grow(sb, len);
 191         memcpy(sb->buf + sb->len, sb->buf + pos, len);
 192         strbuf_setlen(sb, sb->len + len);
 193 }
 194
 195 static int number_length(unsigned long number, long base)
 196 {
 197         int length = 1;
 198         while (number >= base) {
 199                 number /= base;
 200                 length++;
 201         }
 202         return length;
 203 }
 204
 205 /*
 206  * Only supports %u, %i, %d, %l, %o, %x and %X with size indicators
 207  *   '<number>', '0<number>', '-<number>' and ' <number>',
 208  * as well as %c,
 209  * and %s with size indicators '<number>', ' <number>' and '.*'.
 210  */
 211 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 212 {
 213         while (*fmt) {
 214                 char fill = '\0';
 215                 int size = -1, max_size = -1, left_align = 0;
 216                 char *p = (char *)fmt;
 217
 218                 if (*p != '%') {
 219                         p = strchrnul(fmt, '%');
 220                         strbuf_add(sb, fmt, p - fmt);
 221                         fmt = p;
 222                         continue;
 223                 }
 224
 225                 if (*(++p) == '%') {
 226                         strbuf_addch(sb, *p++);
 227                         fmt = p;
 228                         continue;
 229                 }
 230                 if (*p == '-') {
 231                         p++;
 232                         left_align = 1;
 233                 }
 234                 if (*p == ' ' || *p == '0')
 235                         fill = *p++;
 236                 if (isdigit(*p))
 237                         size = (int)strtol(p, &p, 10);
 238                 else if (*p == '.' && p[1] == '*') {
 239                         max_size = va_arg(ap, int);
 240                         p += 2;
 241                 }
 242                 else if (*p == '*') {
 243                         if (!fill)
 244                                 fill = ' ';
 245                         size = va_arg(ap, int);
 246                         p++;
 247                 }
 248
 249                 switch (*p) {
 250                 case 's': {
 251                         const char *s = va_arg(ap, const char *);
 252                         if (fill && !left_align) {
 253                                 int len = size - strlen(s);
 254                                 while (len-- > 0)
 255                                         strbuf_addch(sb, fill);
 256                         }
 257                         while (*s && max_size--)
 258                                 strbuf_addch(sb, *s++);
 259                         if (fill && left_align) {
 260                                 int len = size - strlen(s);
 261                                 while (len-- > 0)
 262                                         strbuf_addch(sb, ' ');
 263                         }
 264                         break;
 265                 }
 266                 case 'c':
 267                         strbuf_addch(sb, va_arg(ap, int));
 268                         break;
 269                 case 'u':
 270                 case 'i':
 271                 case 'l':
 272                 case 'd':
 273                 case 'o':
 274                 case 'x':
 275                 case 'X': {
 276                         int base = *p == 'x' || *p == 'X' ? 16 :
 277                                 *p == 'o' ? 8 : 10;
 278                         int negative = 0, len;
 279                         unsigned long number, power;
 280
 281                         if (*p == 'u')
 282                                 number = va_arg(ap, unsigned int);
 283                         else {
 284                                 long signed_number;
 285                                 if (*p == 'l')
 286                                         signed_number = va_arg(ap, long);
 287                                 else
 288                                         signed_number = va_arg(ap, int);
 289                                 if (signed_number < 0) {
 290                                         negative = 1;
 291                                         number = -signed_number;
 292                                 } else
 293                                         number = signed_number;
 294                         }
 295
 296                         /* pad */
 297                         len = number_length(number, base);
 298                         while (size-- > len + negative)
 299                                 strbuf_addch(sb, fill ? fill : ' ');
 300                         if (negative)
 301                                 strbuf_addch(sb, '-');
 302
 303                         /* output number */
 304                         power = 1;
 305                         while (len-- > 1)
 306                                 power *= base;
 307                         while (power) {
 308                                 int digit = number / power;
 309                                 strbuf_addch(sb, digit < 10 ? '0' + digit
 310                                         : *p + 'A' - 'X' + digit - 10);
 311                                 number -= digit * power;
 312                                 power /= base;
 313                         }
 314
 315                         break;
 316                 }
 317                 case '\0':
 318                         break;
 319                 default:
 320                         /* unknown / invalid format: copy verbatim */
 321                         strbuf_insert(sb, sb->len, fmt, p - fmt + 1);
 322                 }
 323                 fmt = p + (*p != '\0');
 324         }
 325 }
 326
 327 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 328 {
 329         va_list ap;
 330
 331         va_start(ap, fmt);
 332         strbuf_vaddf(sb, fmt, ap);
 333         va_end(ap);
 334 }
 335
 336 void strbuf_initf(struct strbuf *sb, const char *fmt, ...)
 337 {
 338         va_list ap;
 339
 340         strbuf_init(sb, strlen(fmt) + 64);
 341         va_start(ap, fmt);
 342         strbuf_vaddf(sb, fmt, ap);
 343         va_end(ap);
 344 }
 345
 346 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 347                    void *context)
 348 {
 349         for (;;) {
 350                 const char *percent;
 351                 size_t consumed;
 352
 353                 percent = strchrnul(format, '%');
 354                 strbuf_add(sb, format, percent - format);
 355                 if (!*percent)
 356                         break;
 357                 format = percent + 1;
 358
 359                 if (*format == '%') {
 360                         strbuf_addch(sb, '%');
 361                         format++;
 362                         continue;
 363                 }
 364
 365                 consumed = fn(sb, format, context);
 366                 if (consumed)
 367                         format += consumed;
 368                 else
 369                         strbuf_addch(sb, '%');
 370         }
 371 }
 372
 373 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 374                 void *context)
 375 {
 376         struct strbuf_expand_dict_entry *e = context;
 377         size_t len;
 378
 379         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 380                 if (!strncmp(placeholder, e->placeholder, len)) {
 381                         if (e->value)
 382                                 strbuf_addstr(sb, e->value);
 383                         return len;
 384                 }
 385         }
 386         return 0;
 387 }
 388
 389 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 390 {
 391         int i, len = src->len;
 392
 393         for (i = 0; i < len; i++) {
 394                 if (src->buf[i] == '%')
 395                         strbuf_addch(dst, '%');
 396                 strbuf_addch(dst, src->buf[i]);
 397         }
 398 }
 399
 400 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 401 {
 402         size_t res;
 403         size_t oldalloc = sb->alloc;
 404
 405         strbuf_grow(sb, size);
 406         res = fread(sb->buf + sb->len, 1, size, f);
 407         if (res > 0)
 408                 strbuf_setlen(sb, sb->len + res);
 409         else if (oldalloc == 0)
 410                 strbuf_release(sb);
 411         return res;
 412 }
 413
 414 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 415 {
 416         size_t oldlen = sb->len;
 417         size_t oldalloc = sb->alloc;
 418
 419         strbuf_grow(sb, hint ? hint : 8192);
 420         for (;;) {
 421                 ssize_t cnt;
 422
 423                 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 424                 if (cnt < 0) {
 425                         if (oldalloc == 0)
 426                                 strbuf_release(sb);
 427                         else
 428                                 strbuf_setlen(sb, oldlen);
 429                         return -1;
 430                 }
 431                 if (!cnt)
 432                         break;
 433                 sb->len += cnt;
 434                 strbuf_grow(sb, 8192);
 435         }
 436
 437         sb->buf[sb->len] = '\0';
 438         return sb->len - oldlen;
 439 }
 440
 441 #define STRBUF_MAXLINK (2*PATH_MAX)
 442
 443 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 444 {
 445         size_t oldalloc = sb->alloc;
 446
 447         if (hint < 32)
 448                 hint = 32;
 449
 450         while (hint < STRBUF_MAXLINK) {
 451                 int len;
 452
 453                 strbuf_grow(sb, hint);
 454                 len = readlink(path, sb->buf, hint);
 455                 if (len < 0) {
 456                         if (errno != ERANGE)
 457                                 break;
 458                 } else if (len < hint) {
 459                         strbuf_setlen(sb, len);
 460                         return 0;
 461                 }
 462
 463                 /* .. the buffer was too small - try again */
 464                 hint *= 2;
 465         }
 466         if (oldalloc == 0)
 467                 strbuf_release(sb);
 468         return -1;
 469 }
 470
 471 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 472 {
 473         int ch;
 474
 475         strbuf_grow(sb, 0);
 476         if (feof(fp))
 477                 return EOF;
 478
 479         strbuf_reset(sb);
 480         while ((ch = fgetc(fp)) != EOF) {
 481                 strbuf_grow(sb, 1);
 482                 sb->buf[sb->len++] = ch;
 483                 if (ch == term)
 484                         break;
 485         }
 486         if (ch == EOF && sb->len == 0)
 487                 return EOF;
 488
 489         sb->buf[sb->len] = '\0';
 490         return 0;
 491 }
 492
 493 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 494 {
 495         if (strbuf_getwholeline(sb, fp, term))
 496                 return EOF;
 497         if (sb->buf[sb->len-1] == term)
 498                 strbuf_setlen(sb, sb->len-1);
 499         return 0;
 500 }
 501
 502 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 503 {
 504         int fd, len;
 505
 506         fd = open(path, O_RDONLY);
 507         if (fd < 0)
 508                 return -1;
 509         len = strbuf_read(sb, fd, hint);
 510         close(fd);
 511         if (len < 0)
 512                 return -1;
 513
 514         return len;
 515 }
 516
 517 int strbuf_branchname(struct strbuf *sb, const char *name)
 518 {
 519         int len = strlen(name);
 520         if (interpret_branch_name(name, sb) == len)
 521                 return 0;
 522         strbuf_add(sb, name, len);
 523         return len;
 524 }
 525
 526 int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 527 {
 528         strbuf_branchname(sb, name);
 529         strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 530         return check_ref_format(sb->buf);
 531 }