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                 sb->buf[0] = '\0';
  36         }
  37 }
  38
  39 void strbuf_release(struct strbuf *sb)
  40 {
  41         if (sb->alloc) {
  42                 free(sb->buf);
  43                 strbuf_init(sb, 0);
  44         }
  45 }
  46
  47 char *strbuf_detach(struct strbuf *sb, size_t *sz)
  48 {
  49         char *res = sb->alloc ? sb->buf : NULL;
  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         if (sb->len + extra + 1 <= sb->len)
  69                 die("you want to use way too much memory");
  70         if (!sb->alloc)
  71                 sb->buf = NULL;
  72         ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  73 }
  74
  75 void strbuf_trim(struct strbuf *sb)
  76 {
  77         char *b = sb->buf;
  78         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  79                 sb->len--;
  80         while (sb->len > 0 && isspace(*b)) {
  81                 b++;
  82                 sb->len--;
  83         }
  84         memmove(sb->buf, b, sb->len);
  85         sb->buf[sb->len] = '\0';
  86 }
  87 void strbuf_rtrim(struct strbuf *sb)
  88 {
  89         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  90                 sb->len--;
  91         sb->buf[sb->len] = '\0';
  92 }
  93
  94 void strbuf_ltrim(struct strbuf *sb)
  95 {
  96         char *b = sb->buf;
  97         while (sb->len > 0 && isspace(*b)) {
  98                 b++;
  99                 sb->len--;
 100         }
 101         memmove(sb->buf, b, sb->len);
 102         sb->buf[sb->len] = '\0';
 103 }
 104
 105 struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
 106 {
 107         int alloc = 2, pos = 0;
 108         char *n, *p;
 109         struct strbuf **ret;
 110         struct strbuf *t;
 111
 112         ret = xcalloc(alloc, sizeof(struct strbuf *));
 113         p = n = sb->buf;
 114         while (n < sb->buf + sb->len) {
 115                 int len;
 116                 n = memchr(n, delim, sb->len - (n - sb->buf));
 117                 if (pos + 1 >= alloc) {
 118                         alloc = alloc * 2;
 119                         ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 120                 }
 121                 if (!n)
 122                         n = sb->buf + sb->len - 1;
 123                 len = n - p + 1;
 124                 t = xmalloc(sizeof(struct strbuf));
 125                 strbuf_init(t, len);
 126                 strbuf_add(t, p, len);
 127                 ret[pos] = t;
 128                 ret[++pos] = NULL;
 129                 p = ++n;
 130         }
 131         return ret;
 132 }
 133
 134 void strbuf_list_free(struct strbuf **sbs)
 135 {
 136         struct strbuf **s = sbs;
 137
 138         while (*s) {
 139                 strbuf_release(*s);
 140                 free(*s++);
 141         }
 142         free(sbs);
 143 }
 144
 145 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 146 {
 147         int len = a->len < b->len ? a->len: b->len;
 148         int cmp = memcmp(a->buf, b->buf, len);
 149         if (cmp)
 150                 return cmp;
 151         return a->len < b->len ? -1: a->len != b->len;
 152 }
 153
 154 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 155                                    const void *data, size_t dlen)
 156 {
 157         if (pos + len < pos)
 158                 die("you want to use way too much memory");
 159         if (pos > sb->len)
 160                 die("`pos' is too far after the end of the buffer");
 161         if (pos + len > sb->len)
 162                 die("`pos + len' is too far after the end of the buffer");
 163
 164         if (dlen >= len)
 165                 strbuf_grow(sb, dlen - len);
 166         memmove(sb->buf + pos + dlen,
 167                         sb->buf + pos + len,
 168                         sb->len - pos - len);
 169         memcpy(sb->buf + pos, data, dlen);
 170         strbuf_setlen(sb, sb->len + dlen - len);
 171 }
 172
 173 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 174 {
 175         strbuf_splice(sb, pos, 0, data, len);
 176 }
 177
 178 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 179 {
 180         strbuf_splice(sb, pos, len, NULL, 0);
 181 }
 182
 183 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 184 {
 185         strbuf_grow(sb, len);
 186         memcpy(sb->buf + sb->len, data, len);
 187         strbuf_setlen(sb, sb->len + len);
 188 }
 189
 190 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 191 {
 192         strbuf_grow(sb, len);
 193         memcpy(sb->buf + sb->len, sb->buf + pos, len);
 194         strbuf_setlen(sb, sb->len + len);
 195 }
 196
 197 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 198 {
 199         int len;
 200         va_list ap;
 201
 202         if (!strbuf_avail(sb))
 203                 strbuf_grow(sb, 64);
 204         va_start(ap, fmt);
 205         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 206         va_end(ap);
 207         if (len < 0)
 208                 die("your vsnprintf is broken");
 209         if (len > strbuf_avail(sb)) {
 210                 strbuf_grow(sb, len);
 211                 va_start(ap, fmt);
 212                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 213                 va_end(ap);
 214                 if (len > strbuf_avail(sb)) {
 215                         die("this should not happen, your snprintf is broken");
 216                 }
 217         }
 218         strbuf_setlen(sb, sb->len + len);
 219 }
 220
 221 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 222                    void *context)
 223 {
 224         for (;;) {
 225                 const char *percent;
 226                 size_t consumed;
 227
 228                 percent = strchrnul(format, '%');
 229                 strbuf_add(sb, format, percent - format);
 230                 if (!*percent)
 231                         break;
 232                 format = percent + 1;
 233
 234                 if (*format == '%') {
 235                         strbuf_addch(sb, '%');
 236                         format++;
 237                         continue;
 238                 }
 239
 240                 consumed = fn(sb, format, context);
 241                 if (consumed)
 242                         format += consumed;
 243                 else
 244                         strbuf_addch(sb, '%');
 245         }
 246 }
 247
 248 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 249                 void *context)
 250 {
 251         struct strbuf_expand_dict_entry *e = context;
 252         size_t len;
 253
 254         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 255                 if (!strncmp(placeholder, e->placeholder, len)) {
 256                         if (e->value)
 257                                 strbuf_addstr(sb, e->value);
 258                         return len;
 259                 }
 260         }
 261         return 0;
 262 }
 263
 264 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 265 {
 266         int i, len = src->len;
 267
 268         for (i = 0; i < len; i++) {
 269                 if (src->buf[i] == '%')
 270                         strbuf_addch(dst, '%');
 271                 strbuf_addch(dst, src->buf[i]);
 272         }
 273 }
 274
 275 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 276 {
 277         size_t res;
 278         size_t oldalloc = sb->alloc;
 279
 280         strbuf_grow(sb, size);
 281         res = fread(sb->buf + sb->len, 1, size, f);
 282         if (res > 0)
 283                 strbuf_setlen(sb, sb->len + res);
 284         else if (oldalloc == 0)
 285                 strbuf_release(sb);
 286         return res;
 287 }
 288
 289 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 290 {
 291         size_t oldlen = sb->len;
 292         size_t oldalloc = sb->alloc;
 293
 294         strbuf_grow(sb, hint ? hint : 8192);
 295         for (;;) {
 296                 ssize_t cnt;
 297
 298                 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 299                 if (cnt < 0) {
 300                         if (oldalloc == 0)
 301                                 strbuf_release(sb);
 302                         else
 303                                 strbuf_setlen(sb, oldlen);
 304                         return -1;
 305                 }
 306                 if (!cnt)
 307                         break;
 308                 sb->len += cnt;
 309                 strbuf_grow(sb, 8192);
 310         }
 311
 312         sb->buf[sb->len] = '\0';
 313         return sb->len - oldlen;
 314 }
 315
 316 #define STRBUF_MAXLINK (2*PATH_MAX)
 317
 318 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 319 {
 320         size_t oldalloc = sb->alloc;
 321
 322         if (hint < 32)
 323                 hint = 32;
 324
 325         while (hint < STRBUF_MAXLINK) {
 326                 int len;
 327
 328                 strbuf_grow(sb, hint);
 329                 len = readlink(path, sb->buf, hint);
 330                 if (len < 0) {
 331                         if (errno != ERANGE)
 332                                 break;
 333                 } else if (len < hint) {
 334                         strbuf_setlen(sb, len);
 335                         return 0;
 336                 }
 337
 338                 /* .. the buffer was too small - try again */
 339                 hint *= 2;
 340         }
 341         if (oldalloc == 0)
 342                 strbuf_release(sb);
 343         return -1;
 344 }
 345
 346 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 347 {
 348         int ch;
 349
 350         strbuf_grow(sb, 0);
 351         if (feof(fp))
 352                 return EOF;
 353
 354         strbuf_reset(sb);
 355         while ((ch = fgetc(fp)) != EOF) {
 356                 strbuf_grow(sb, 1);
 357                 sb->buf[sb->len++] = ch;
 358                 if (ch == term)
 359                         break;
 360         }
 361         if (ch == EOF && sb->len == 0)
 362                 return EOF;
 363
 364         sb->buf[sb->len] = '\0';
 365         return 0;
 366 }
 367
 368 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 369 {
 370         if (strbuf_getwholeline(sb, fp, term))
 371                 return EOF;
 372         if (sb->buf[sb->len-1] == term)
 373                 strbuf_setlen(sb, sb->len-1);
 374         return 0;
 375 }
 376
 377 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 378 {
 379         int fd, len;
 380
 381         fd = open(path, O_RDONLY);
 382         if (fd < 0)
 383                 return -1;
 384         len = strbuf_read(sb, fd, hint);
 385         close(fd);
 386         if (len < 0)
 387                 return -1;
 388
 389         return len;
 390 }
 391
 392 int strbuf_branchname(struct strbuf *sb, const char *name)
 393 {
 394         int len = strlen(name);
 395         if (interpret_branch_name(name, sb) == len)
 396                 return 0;
 397         strbuf_add(sb, name, len);
 398         return len;
 399 }
 400
 401 int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 402 {
 403         strbuf_branchname(sb, name);
 404         strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 405         return check_ref_format(sb->buf);
 406 }