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 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 196 {
 197         int len;
 198         va_list ap;
 199
 200         if (!strbuf_avail(sb))
 201                 strbuf_grow(sb, 64);
 202         va_start(ap, fmt);
 203         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 204         va_end(ap);
 205         if (len < 0)
 206                 die("your vsnprintf is broken");
 207         if (len > strbuf_avail(sb)) {
 208                 strbuf_grow(sb, len);
 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 > strbuf_avail(sb)) {
 213                         die("this should not happen, your snprintf is broken");
 214                 }
 215         }
 216         strbuf_setlen(sb, sb->len + len);
 217 }
 218
 219 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 220                    void *context)
 221 {
 222         for (;;) {
 223                 const char *percent;
 224                 size_t consumed;
 225
 226                 percent = strchrnul(format, '%');
 227                 strbuf_add(sb, format, percent - format);
 228                 if (!*percent)
 229                         break;
 230                 format = percent + 1;
 231
 232                 if (*format == '%') {
 233                         strbuf_addch(sb, '%');
 234                         format++;
 235                         continue;
 236                 }
 237
 238                 consumed = fn(sb, format, context);
 239                 if (consumed)
 240                         format += consumed;
 241                 else
 242                         strbuf_addch(sb, '%');
 243         }
 244 }
 245
 246 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 247                 void *context)
 248 {
 249         struct strbuf_expand_dict_entry *e = context;
 250         size_t len;
 251
 252         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 253                 if (!strncmp(placeholder, e->placeholder, len)) {
 254                         if (e->value)
 255                                 strbuf_addstr(sb, e->value);
 256                         return len;
 257                 }
 258         }
 259         return 0;
 260 }
 261
 262 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 263 {
 264         int i, len = src->len;
 265
 266         for (i = 0; i < len; i++) {
 267                 if (src->buf[i] == '%')
 268                         strbuf_addch(dst, '%');
 269                 strbuf_addch(dst, src->buf[i]);
 270         }
 271 }
 272
 273 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 274 {
 275         size_t res;
 276         size_t oldalloc = sb->alloc;
 277
 278         strbuf_grow(sb, size);
 279         res = fread(sb->buf + sb->len, 1, size, f);
 280         if (res > 0)
 281                 strbuf_setlen(sb, sb->len + res);
 282         else if (oldalloc == 0)
 283                 strbuf_release(sb);
 284         return res;
 285 }
 286
 287 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 288 {
 289         size_t oldlen = sb->len;
 290         size_t oldalloc = sb->alloc;
 291
 292         strbuf_grow(sb, hint ? hint : 8192);
 293         for (;;) {
 294                 ssize_t cnt;
 295
 296                 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 297                 if (cnt < 0) {
 298                         if (oldalloc == 0)
 299                                 strbuf_release(sb);
 300                         else
 301                                 strbuf_setlen(sb, oldlen);
 302                         return -1;
 303                 }
 304                 if (!cnt)
 305                         break;
 306                 sb->len += cnt;
 307                 strbuf_grow(sb, 8192);
 308         }
 309
 310         sb->buf[sb->len] = '\0';
 311         return sb->len - oldlen;
 312 }
 313
 314 #define STRBUF_MAXLINK (2*PATH_MAX)
 315
 316 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 317 {
 318         size_t oldalloc = sb->alloc;
 319
 320         if (hint < 32)
 321                 hint = 32;
 322
 323         while (hint < STRBUF_MAXLINK) {
 324                 int len;
 325
 326                 strbuf_grow(sb, hint);
 327                 len = readlink(path, sb->buf, hint);
 328                 if (len < 0) {
 329                         if (errno != ERANGE)
 330                                 break;
 331                 } else if (len < hint) {
 332                         strbuf_setlen(sb, len);
 333                         return 0;
 334                 }
 335
 336                 /* .. the buffer was too small - try again */
 337                 hint *= 2;
 338         }
 339         if (oldalloc == 0)
 340                 strbuf_release(sb);
 341         return -1;
 342 }
 343
 344 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 345 {
 346         int ch;
 347
 348         strbuf_grow(sb, 0);
 349         if (feof(fp))
 350                 return EOF;
 351
 352         strbuf_reset(sb);
 353         while ((ch = fgetc(fp)) != EOF) {
 354                 strbuf_grow(sb, 1);
 355                 sb->buf[sb->len++] = ch;
 356                 if (ch == term)
 357                         break;
 358         }
 359         if (ch == EOF && sb->len == 0)
 360                 return EOF;
 361
 362         sb->buf[sb->len] = '\0';
 363         return 0;
 364 }
 365
 366 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 367 {
 368         if (strbuf_getwholeline(sb, fp, term))
 369                 return EOF;
 370         if (sb->buf[sb->len-1] == term)
 371                 strbuf_setlen(sb, sb->len-1);
 372         return 0;
 373 }
 374
 375 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 376 {
 377         int fd, len;
 378
 379         fd = open(path, O_RDONLY);
 380         if (fd < 0)
 381                 return -1;
 382         len = strbuf_read(sb, fd, hint);
 383         close(fd);
 384         if (len < 0)
 385                 return -1;
 386
 387         return len;
 388 }
 389
 390 int strbuf_branchname(struct strbuf *sb, const char *name)
 391 {
 392         int len = strlen(name);
 393         if (interpret_branch_name(name, sb) == len)
 394                 return 0;
 395         strbuf_add(sb, name, len);
 396         return len;
 397 }
 398
 399 int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 400 {
 401         strbuf_branchname(sb, name);
 402         if (name[0] == '-')
 403                 return CHECK_REF_FORMAT_ERROR;
 404         strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 405         return check_ref_format(sb->buf);
 406 }