Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit Merge branch 'jk/maint-fetch-status-table' into maint-1.7.6 (52b195f)
   1#include "cache.h"
   2#include "refs.h"
   3
   4int 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
  13int 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 */
  27char strbuf_slopbuf[1];
  28
  29void 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
  39void strbuf_release(struct strbuf *sb)
  40{
  41        if (sb->alloc) {
  42                free(sb->buf);
  43                strbuf_init(sb, 0);
  44        }
  45}
  46
  47char *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
  56void 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
  66void 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
  76void 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}
  88void 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
  95void 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
 106struct 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
 138void 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
 149int 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
 158void 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
 177void 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
 182void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 183{
 184        strbuf_splice(sb, pos, len, NULL, 0);
 185}
 186
 187void 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
 194void 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
 201void 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
 209void 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
 230void 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
 257size_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
 273void 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
 284size_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
 298ssize_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
 327int 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
 355int 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
 377int 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
 386int 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}