Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2
   3int prefixcmp(const char *str, const char *prefix)
   4{
   5        for (; ; str++, prefix++)
   6                if (!*prefix)
   7                        return 0;
   8                else if (*str != *prefix)
   9                        return (unsigned char)*prefix - (unsigned char)*str;
  10}
  11
  12/*
  13 * Used as the default ->buf value, so that people can always assume
  14 * buf is non NULL and ->buf is NUL terminated even for a freshly
  15 * initialized strbuf.
  16 */
  17char strbuf_slopbuf[1];
  18
  19void strbuf_init(struct strbuf *sb, size_t hint)
  20{
  21        sb->alloc = sb->len = 0;
  22        sb->buf = strbuf_slopbuf;
  23        if (hint)
  24                strbuf_grow(sb, hint);
  25}
  26
  27void strbuf_release(struct strbuf *sb)
  28{
  29        if (sb->alloc) {
  30                free(sb->buf);
  31                strbuf_init(sb, 0);
  32        }
  33}
  34
  35char *strbuf_detach(struct strbuf *sb, size_t *sz)
  36{
  37        char *res = sb->alloc ? sb->buf : NULL;
  38        if (sz)
  39                *sz = sb->len;
  40        strbuf_init(sb, 0);
  41        return res;
  42}
  43
  44void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  45{
  46        strbuf_release(sb);
  47        sb->buf   = buf;
  48        sb->len   = len;
  49        sb->alloc = alloc;
  50        strbuf_grow(sb, 0);
  51        sb->buf[sb->len] = '\0';
  52}
  53
  54void strbuf_grow(struct strbuf *sb, size_t extra)
  55{
  56        if (sb->len + extra + 1 <= sb->len)
  57                die("you want to use way too much memory");
  58        if (!sb->alloc)
  59                sb->buf = NULL;
  60        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  61}
  62
  63void strbuf_trim(struct strbuf *sb)
  64{
  65        char *b = sb->buf;
  66        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  67                sb->len--;
  68        while (sb->len > 0 && isspace(*b)) {
  69                b++;
  70                sb->len--;
  71        }
  72        memmove(sb->buf, b, sb->len);
  73        sb->buf[sb->len] = '\0';
  74}
  75void strbuf_rtrim(struct strbuf *sb)
  76{
  77        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  78                sb->len--;
  79        sb->buf[sb->len] = '\0';
  80}
  81
  82void strbuf_ltrim(struct strbuf *sb)
  83{
  84        char *b = sb->buf;
  85        while (sb->len > 0 && isspace(*b)) {
  86                b++;
  87                sb->len--;
  88        }
  89        memmove(sb->buf, b, sb->len);
  90        sb->buf[sb->len] = '\0';
  91}
  92
  93void strbuf_tolower(struct strbuf *sb)
  94{
  95        int i;
  96        for (i = 0; i < sb->len; i++)
  97                sb->buf[i] = tolower(sb->buf[i]);
  98}
  99
 100struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
 101{
 102        int alloc = 2, pos = 0;
 103        char *n, *p;
 104        struct strbuf **ret;
 105        struct strbuf *t;
 106
 107        ret = xcalloc(alloc, sizeof(struct strbuf *));
 108        p = n = sb->buf;
 109        while (n < sb->buf + sb->len) {
 110                int len;
 111                n = memchr(n, delim, sb->len - (n - sb->buf));
 112                if (pos + 1 >= alloc) {
 113                        alloc = alloc * 2;
 114                        ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 115                }
 116                if (!n)
 117                        n = sb->buf + sb->len - 1;
 118                len = n - p + 1;
 119                t = xmalloc(sizeof(struct strbuf));
 120                strbuf_init(t, len);
 121                strbuf_add(t, p, len);
 122                ret[pos] = t;
 123                ret[++pos] = NULL;
 124                p = ++n;
 125        }
 126        return ret;
 127}
 128
 129void strbuf_list_free(struct strbuf **sbs)
 130{
 131        struct strbuf **s = sbs;
 132
 133        while (*s) {
 134                strbuf_release(*s);
 135                free(*s++);
 136        }
 137        free(sbs);
 138}
 139
 140int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 141{
 142        int len = a->len < b->len ? a->len: b->len;
 143        int cmp = memcmp(a->buf, b->buf, len);
 144        if (cmp)
 145                return cmp;
 146        return a->len < b->len ? -1: a->len != b->len;
 147}
 148
 149void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 150                                   const void *data, size_t dlen)
 151{
 152        if (pos + len < pos)
 153                die("you want to use way too much memory");
 154        if (pos > sb->len)
 155                die("`pos' is too far after the end of the buffer");
 156        if (pos + len > sb->len)
 157                die("`pos + len' is too far after the end of the buffer");
 158
 159        if (dlen >= len)
 160                strbuf_grow(sb, dlen - len);
 161        memmove(sb->buf + pos + dlen,
 162                        sb->buf + pos + len,
 163                        sb->len - pos - len);
 164        memcpy(sb->buf + pos, data, dlen);
 165        strbuf_setlen(sb, sb->len + dlen - len);
 166}
 167
 168void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 169{
 170        strbuf_splice(sb, pos, 0, data, len);
 171}
 172
 173void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 174{
 175        strbuf_splice(sb, pos, len, NULL, 0);
 176}
 177
 178void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 179{
 180        strbuf_grow(sb, len);
 181        memcpy(sb->buf + sb->len, data, len);
 182        strbuf_setlen(sb, sb->len + len);
 183}
 184
 185void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 186{
 187        strbuf_grow(sb, len);
 188        memcpy(sb->buf + sb->len, sb->buf + pos, len);
 189        strbuf_setlen(sb, sb->len + len);
 190}
 191
 192void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 193{
 194        int len;
 195        va_list ap;
 196
 197        if (!strbuf_avail(sb))
 198                strbuf_grow(sb, 64);
 199        va_start(ap, fmt);
 200        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 201        va_end(ap);
 202        if (len < 0)
 203                die("your vsnprintf is broken");
 204        if (len > strbuf_avail(sb)) {
 205                strbuf_grow(sb, len);
 206                va_start(ap, fmt);
 207                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 208                va_end(ap);
 209                if (len > strbuf_avail(sb)) {
 210                        die("this should not happen, your snprintf is broken");
 211                }
 212        }
 213        strbuf_setlen(sb, sb->len + len);
 214}
 215
 216void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 217                   void *context)
 218{
 219        for (;;) {
 220                const char *percent;
 221                size_t consumed;
 222
 223                percent = strchrnul(format, '%');
 224                strbuf_add(sb, format, percent - format);
 225                if (!*percent)
 226                        break;
 227                format = percent + 1;
 228
 229                consumed = fn(sb, format, context);
 230                if (consumed)
 231                        format += consumed;
 232                else
 233                        strbuf_addch(sb, '%');
 234        }
 235}
 236
 237size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 238                void *context)
 239{
 240        struct strbuf_expand_dict_entry *e = context;
 241        size_t len;
 242
 243        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 244                if (!strncmp(placeholder, e->placeholder, len)) {
 245                        if (e->value)
 246                                strbuf_addstr(sb, e->value);
 247                        return len;
 248                }
 249        }
 250        return 0;
 251}
 252
 253size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 254{
 255        size_t res;
 256        size_t oldalloc = sb->alloc;
 257
 258        strbuf_grow(sb, size);
 259        res = fread(sb->buf + sb->len, 1, size, f);
 260        if (res > 0)
 261                strbuf_setlen(sb, sb->len + res);
 262        else if (res < 0 && oldalloc == 0)
 263                strbuf_release(sb);
 264        return res;
 265}
 266
 267ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 268{
 269        size_t oldlen = sb->len;
 270        size_t oldalloc = sb->alloc;
 271
 272        strbuf_grow(sb, hint ? hint : 8192);
 273        for (;;) {
 274                ssize_t cnt;
 275
 276                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 277                if (cnt < 0) {
 278                        if (oldalloc == 0)
 279                                strbuf_release(sb);
 280                        else
 281                                strbuf_setlen(sb, oldlen);
 282                        return -1;
 283                }
 284                if (!cnt)
 285                        break;
 286                sb->len += cnt;
 287                strbuf_grow(sb, 8192);
 288        }
 289
 290        sb->buf[sb->len] = '\0';
 291        return sb->len - oldlen;
 292}
 293
 294#define STRBUF_MAXLINK (2*PATH_MAX)
 295
 296int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 297{
 298        size_t oldalloc = sb->alloc;
 299
 300        if (hint < 32)
 301                hint = 32;
 302
 303        while (hint < STRBUF_MAXLINK) {
 304                int len;
 305
 306                strbuf_grow(sb, hint);
 307                len = readlink(path, sb->buf, hint);
 308                if (len < 0) {
 309                        if (errno != ERANGE)
 310                                break;
 311                } else if (len < hint) {
 312                        strbuf_setlen(sb, len);
 313                        return 0;
 314                }
 315
 316                /* .. the buffer was too small - try again */
 317                hint *= 2;
 318        }
 319        if (oldalloc == 0)
 320                strbuf_release(sb);
 321        return -1;
 322}
 323
 324int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 325{
 326        int ch;
 327
 328        strbuf_grow(sb, 0);
 329        if (feof(fp))
 330                return EOF;
 331
 332        strbuf_reset(sb);
 333        while ((ch = fgetc(fp)) != EOF) {
 334                if (ch == term)
 335                        break;
 336                strbuf_grow(sb, 1);
 337                sb->buf[sb->len++] = ch;
 338        }
 339        if (ch == EOF && sb->len == 0)
 340                return EOF;
 341
 342        sb->buf[sb->len] = '\0';
 343        return 0;
 344}
 345
 346int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 347{
 348        int fd, len;
 349
 350        fd = open(path, O_RDONLY);
 351        if (fd < 0)
 352                return -1;
 353        len = strbuf_read(sb, fd, hint);
 354        close(fd);
 355        if (len < 0)
 356                return -1;
 357
 358        return len;
 359}