Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit pull: Fix parsing of -X<option> (14e5d40)
   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}
  36
  37void strbuf_release(struct strbuf *sb)
  38{
  39        if (sb->alloc) {
  40                free(sb->buf);
  41                strbuf_init(sb, 0);
  42        }
  43}
  44
  45char *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
  54void 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
  64void 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
  73void 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}
  85void 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
  92void 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
 103void 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
 110struct 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
 139void 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
 150int 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
 159void 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
 178void 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
 183void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 184{
 185        strbuf_splice(sb, pos, len, NULL, 0);
 186}
 187
 188void 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
 195void 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
 202void 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
 226void 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
 247size_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
 263size_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
 277ssize_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
 306int 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
 334int 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
 356int 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
 365int 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
 380int 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
 389int 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}