Andrew's git - gitweb.git/blob

   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
  13/*
  14 * Used as the default ->buf value, so that people can always assume
  15 * buf is non NULL and ->buf is NUL terminated even for a freshly
  16 * initialized strbuf.
  17 */
  18char strbuf_slopbuf[1];
  19
  20void strbuf_init(struct strbuf *sb, size_t hint)
  21{
  22        sb->alloc = sb->len = 0;
  23        sb->buf = strbuf_slopbuf;
  24        if (hint)
  25                strbuf_grow(sb, hint);
  26}
  27
  28void strbuf_release(struct strbuf *sb)
  29{
  30        if (sb->alloc) {
  31                free(sb->buf);
  32                strbuf_init(sb, 0);
  33        }
  34}
  35
  36char *strbuf_detach(struct strbuf *sb, size_t *sz)
  37{
  38        char *res = sb->alloc ? sb->buf : NULL;
  39        if (sz)
  40                *sz = sb->len;
  41        strbuf_init(sb, 0);
  42        return res;
  43}
  44
  45void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  46{
  47        strbuf_release(sb);
  48        sb->buf   = buf;
  49        sb->len   = len;
  50        sb->alloc = alloc;
  51        strbuf_grow(sb, 0);
  52        sb->buf[sb->len] = '\0';
  53}
  54
  55void strbuf_grow(struct strbuf *sb, size_t extra)
  56{
  57        if (sb->len + extra + 1 <= sb->len)
  58                die("you want to use way too much memory");
  59        if (!sb->alloc)
  60                sb->buf = NULL;
  61        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  62}
  63
  64void strbuf_trim(struct strbuf *sb)
  65{
  66        char *b = sb->buf;
  67        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  68                sb->len--;
  69        while (sb->len > 0 && isspace(*b)) {
  70                b++;
  71                sb->len--;
  72        }
  73        memmove(sb->buf, b, sb->len);
  74        sb->buf[sb->len] = '\0';
  75}
  76void strbuf_rtrim(struct strbuf *sb)
  77{
  78        while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
  79                sb->len--;
  80        sb->buf[sb->len] = '\0';
  81}
  82
  83void strbuf_ltrim(struct strbuf *sb)
  84{
  85        char *b = sb->buf;
  86        while (sb->len > 0 && isspace(*b)) {
  87                b++;
  88                sb->len--;
  89        }
  90        memmove(sb->buf, b, sb->len);
  91        sb->buf[sb->len] = '\0';
  92}
  93
  94struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
  95{
  96        int alloc = 2, pos = 0;
  97        char *n, *p;
  98        struct strbuf **ret;
  99        struct strbuf *t;
 100
 101        ret = xcalloc(alloc, sizeof(struct strbuf *));
 102        p = n = sb->buf;
 103        while (n < sb->buf + sb->len) {
 104                int len;
 105                n = memchr(n, delim, sb->len - (n - sb->buf));
 106                if (pos + 1 >= alloc) {
 107                        alloc = alloc * 2;
 108                        ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 109                }
 110                if (!n)
 111                        n = sb->buf + sb->len - 1;
 112                len = n - p + 1;
 113                t = xmalloc(sizeof(struct strbuf));
 114                strbuf_init(t, len);
 115                strbuf_add(t, p, len);
 116                ret[pos] = t;
 117                ret[++pos] = NULL;
 118                p = ++n;
 119        }
 120        return ret;
 121}
 122
 123void strbuf_list_free(struct strbuf **sbs)
 124{
 125        struct strbuf **s = sbs;
 126
 127        while (*s) {
 128                strbuf_release(*s);
 129                free(*s++);
 130        }
 131        free(sbs);
 132}
 133
 134int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 135{
 136        int len = a->len < b->len ? a->len: b->len;
 137        int cmp = memcmp(a->buf, b->buf, len);
 138        if (cmp)
 139                return cmp;
 140        return a->len < b->len ? -1: a->len != b->len;
 141}
 142
 143void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 144                                   const void *data, size_t dlen)
 145{
 146        if (pos + len < pos)
 147                die("you want to use way too much memory");
 148        if (pos > sb->len)
 149                die("`pos' is too far after the end of the buffer");
 150        if (pos + len > sb->len)
 151                die("`pos + len' is too far after the end of the buffer");
 152
 153        if (dlen >= len)
 154                strbuf_grow(sb, dlen - len);
 155        memmove(sb->buf + pos + dlen,
 156                        sb->buf + pos + len,
 157                        sb->len - pos - len);
 158        memcpy(sb->buf + pos, data, dlen);
 159        strbuf_setlen(sb, sb->len + dlen - len);
 160}
 161
 162void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 163{
 164        strbuf_splice(sb, pos, 0, data, len);
 165}
 166
 167void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 168{
 169        strbuf_splice(sb, pos, len, NULL, 0);
 170}
 171
 172void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 173{
 174        strbuf_grow(sb, len);
 175        memcpy(sb->buf + sb->len, data, len);
 176        strbuf_setlen(sb, sb->len + len);
 177}
 178
 179void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 180{
 181        strbuf_grow(sb, len);
 182        memcpy(sb->buf + sb->len, sb->buf + pos, len);
 183        strbuf_setlen(sb, sb->len + len);
 184}
 185
 186void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 187{
 188        int len;
 189        va_list ap;
 190
 191        if (!strbuf_avail(sb))
 192                strbuf_grow(sb, 64);
 193        va_start(ap, fmt);
 194        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 195        va_end(ap);
 196        if (len < 0)
 197                die("your vsnprintf is broken");
 198        if (len > strbuf_avail(sb)) {
 199                strbuf_grow(sb, len);
 200                va_start(ap, fmt);
 201                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 202                va_end(ap);
 203                if (len > strbuf_avail(sb)) {
 204                        die("this should not happen, your snprintf is broken");
 205                }
 206        }
 207        strbuf_setlen(sb, sb->len + len);
 208}
 209
 210void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 211                   void *context)
 212{
 213        for (;;) {
 214                const char *percent;
 215                size_t consumed;
 216
 217                percent = strchrnul(format, '%');
 218                strbuf_add(sb, format, percent - format);
 219                if (!*percent)
 220                        break;
 221                format = percent + 1;
 222
 223                consumed = fn(sb, format, context);
 224                if (consumed)
 225                        format += consumed;
 226                else
 227                        strbuf_addch(sb, '%');
 228        }
 229}
 230
 231size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 232                void *context)
 233{
 234        struct strbuf_expand_dict_entry *e = context;
 235        size_t len;
 236
 237        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 238                if (!strncmp(placeholder, e->placeholder, len)) {
 239                        if (e->value)
 240                                strbuf_addstr(sb, e->value);
 241                        return len;
 242                }
 243        }
 244        return 0;
 245}
 246
 247size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 248{
 249        size_t res;
 250        size_t oldalloc = sb->alloc;
 251
 252        strbuf_grow(sb, size);
 253        res = fread(sb->buf + sb->len, 1, size, f);
 254        if (res > 0)
 255                strbuf_setlen(sb, sb->len + res);
 256        else if (oldalloc == 0)
 257                strbuf_release(sb);
 258        return res;
 259}
 260
 261ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 262{
 263        size_t oldlen = sb->len;
 264        size_t oldalloc = sb->alloc;
 265
 266        strbuf_grow(sb, hint ? hint : 8192);
 267        for (;;) {
 268                ssize_t cnt;
 269
 270                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 271                if (cnt < 0) {
 272                        if (oldalloc == 0)
 273                                strbuf_release(sb);
 274                        else
 275                                strbuf_setlen(sb, oldlen);
 276                        return -1;
 277                }
 278                if (!cnt)
 279                        break;
 280                sb->len += cnt;
 281                strbuf_grow(sb, 8192);
 282        }
 283
 284        sb->buf[sb->len] = '\0';
 285        return sb->len - oldlen;
 286}
 287
 288#define STRBUF_MAXLINK (2*PATH_MAX)
 289
 290int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 291{
 292        size_t oldalloc = sb->alloc;
 293
 294        if (hint < 32)
 295                hint = 32;
 296
 297        while (hint < STRBUF_MAXLINK) {
 298                int len;
 299
 300                strbuf_grow(sb, hint);
 301                len = readlink(path, sb->buf, hint);
 302                if (len < 0) {
 303                        if (errno != ERANGE)
 304                                break;
 305                } else if (len < hint) {
 306                        strbuf_setlen(sb, len);
 307                        return 0;
 308                }
 309
 310                /* .. the buffer was too small - try again */
 311                hint *= 2;
 312        }
 313        if (oldalloc == 0)
 314                strbuf_release(sb);
 315        return -1;
 316}
 317
 318int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 319{
 320        int ch;
 321
 322        strbuf_grow(sb, 0);
 323        if (feof(fp))
 324                return EOF;
 325
 326        strbuf_reset(sb);
 327        while ((ch = fgetc(fp)) != EOF) {
 328                strbuf_grow(sb, 1);
 329                sb->buf[sb->len++] = ch;
 330                if (ch == term)
 331                        break;
 332        }
 333        if (ch == EOF && sb->len == 0)
 334                return EOF;
 335
 336        sb->buf[sb->len] = '\0';
 337        return 0;
 338}
 339
 340int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 341{
 342        if (strbuf_getwholeline(sb, fp, term))
 343                return EOF;
 344        if (sb->buf[sb->len-1] == term)
 345                strbuf_setlen(sb, sb->len-1);
 346        return 0;
 347}
 348
 349int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 350{
 351        int fd, len;
 352
 353        fd = open(path, O_RDONLY);
 354        if (fd < 0)
 355                return -1;
 356        len = strbuf_read(sb, fd, hint);
 357        close(fd);
 358        if (len < 0)
 359                return -1;
 360
 361        return len;
 362}
 363
 364int strbuf_branchname(struct strbuf *sb, const char *name)
 365{
 366        int len = strlen(name);
 367        if (interpret_branch_name(name, sb) == len)
 368                return 0;
 369        strbuf_add(sb, name, len);
 370        return len;
 371}
 372
 373int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 374{
 375        strbuf_branchname(sb, name);
 376        strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 377        return check_ref_format(sb->buf);
 378}