Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit config: support values longer than 1023 bytes (e96c19c)
   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 (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
  75void 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}
  87void 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
  94void 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
 105struct 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
 134void 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
 145int 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
 154void 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
 173void 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
 178void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 179{
 180        strbuf_splice(sb, pos, len, NULL, 0);
 181}
 182
 183void 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
 190void 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
 197void 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
 221void 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
 248size_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
 264void 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
 275size_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
 289ssize_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
 318int 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
 346int 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
 368int 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
 377int 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
 392int 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
 401int 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}