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