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