Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit strbuf: add strbuf_addbuf_percentquote (361df5d)
   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
  94void strbuf_tolower(struct strbuf *sb)
  95{
  96        int i;
  97        for (i = 0; i < sb->len; i++)
  98                sb->buf[i] = tolower(sb->buf[i]);
  99}
 100
 101struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
 102{
 103        int alloc = 2, pos = 0;
 104        char *n, *p;
 105        struct strbuf **ret;
 106        struct strbuf *t;
 107
 108        ret = xcalloc(alloc, sizeof(struct strbuf *));
 109        p = n = sb->buf;
 110        while (n < sb->buf + sb->len) {
 111                int len;
 112                n = memchr(n, delim, sb->len - (n - sb->buf));
 113                if (pos + 1 >= alloc) {
 114                        alloc = alloc * 2;
 115                        ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 116                }
 117                if (!n)
 118                        n = sb->buf + sb->len - 1;
 119                len = n - p + 1;
 120                t = xmalloc(sizeof(struct strbuf));
 121                strbuf_init(t, len);
 122                strbuf_add(t, p, len);
 123                ret[pos] = t;
 124                ret[++pos] = NULL;
 125                p = ++n;
 126        }
 127        return ret;
 128}
 129
 130void strbuf_list_free(struct strbuf **sbs)
 131{
 132        struct strbuf **s = sbs;
 133
 134        while (*s) {
 135                strbuf_release(*s);
 136                free(*s++);
 137        }
 138        free(sbs);
 139}
 140
 141int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 142{
 143        int len = a->len < b->len ? a->len: b->len;
 144        int cmp = memcmp(a->buf, b->buf, len);
 145        if (cmp)
 146                return cmp;
 147        return a->len < b->len ? -1: a->len != b->len;
 148}
 149
 150void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 151                                   const void *data, size_t dlen)
 152{
 153        if (pos + len < pos)
 154                die("you want to use way too much memory");
 155        if (pos > sb->len)
 156                die("`pos' is too far after the end of the buffer");
 157        if (pos + len > sb->len)
 158                die("`pos + len' is too far after the end of the buffer");
 159
 160        if (dlen >= len)
 161                strbuf_grow(sb, dlen - len);
 162        memmove(sb->buf + pos + dlen,
 163                        sb->buf + pos + len,
 164                        sb->len - pos - len);
 165        memcpy(sb->buf + pos, data, dlen);
 166        strbuf_setlen(sb, sb->len + dlen - len);
 167}
 168
 169void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 170{
 171        strbuf_splice(sb, pos, 0, data, len);
 172}
 173
 174void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 175{
 176        strbuf_splice(sb, pos, len, NULL, 0);
 177}
 178
 179void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 180{
 181        strbuf_grow(sb, len);
 182        memcpy(sb->buf + sb->len, data, len);
 183        strbuf_setlen(sb, sb->len + len);
 184}
 185
 186void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 187{
 188        strbuf_grow(sb, len);
 189        memcpy(sb->buf + sb->len, sb->buf + pos, len);
 190        strbuf_setlen(sb, sb->len + len);
 191}
 192
 193void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 194{
 195        int len;
 196        va_list ap;
 197
 198        if (!strbuf_avail(sb))
 199                strbuf_grow(sb, 64);
 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 < 0)
 204                die("your vsnprintf is broken");
 205        if (len > strbuf_avail(sb)) {
 206                strbuf_grow(sb, len);
 207                va_start(ap, fmt);
 208                len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 209                va_end(ap);
 210                if (len > strbuf_avail(sb)) {
 211                        die("this should not happen, your snprintf is broken");
 212                }
 213        }
 214        strbuf_setlen(sb, sb->len + len);
 215}
 216
 217void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 218                   void *context)
 219{
 220        for (;;) {
 221                const char *percent;
 222                size_t consumed;
 223
 224                percent = strchrnul(format, '%');
 225                strbuf_add(sb, format, percent - format);
 226                if (!*percent)
 227                        break;
 228                format = percent + 1;
 229
 230                if (*format == '%') {
 231                        strbuf_addch(sb, '%');
 232                        format++;
 233                        continue;
 234                }
 235
 236                consumed = fn(sb, format, context);
 237                if (consumed)
 238                        format += consumed;
 239                else
 240                        strbuf_addch(sb, '%');
 241        }
 242}
 243
 244size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 245                void *context)
 246{
 247        struct strbuf_expand_dict_entry *e = context;
 248        size_t len;
 249
 250        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 251                if (!strncmp(placeholder, e->placeholder, len)) {
 252                        if (e->value)
 253                                strbuf_addstr(sb, e->value);
 254                        return len;
 255                }
 256        }
 257        return 0;
 258}
 259
 260void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 261{
 262        int i, len = src->len;
 263
 264        for (i = 0; i < len; i++) {
 265                if (src->buf[i] == '%')
 266                        strbuf_addch(dst, '%');
 267                strbuf_addch(dst, src->buf[i]);
 268        }
 269}
 270
 271size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 272{
 273        size_t res;
 274        size_t oldalloc = sb->alloc;
 275
 276        strbuf_grow(sb, size);
 277        res = fread(sb->buf + sb->len, 1, size, f);
 278        if (res > 0)
 279                strbuf_setlen(sb, sb->len + res);
 280        else if (oldalloc == 0)
 281                strbuf_release(sb);
 282        return res;
 283}
 284
 285ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 286{
 287        size_t oldlen = sb->len;
 288        size_t oldalloc = sb->alloc;
 289
 290        strbuf_grow(sb, hint ? hint : 8192);
 291        for (;;) {
 292                ssize_t cnt;
 293
 294                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 295                if (cnt < 0) {
 296                        if (oldalloc == 0)
 297                                strbuf_release(sb);
 298                        else
 299                                strbuf_setlen(sb, oldlen);
 300                        return -1;
 301                }
 302                if (!cnt)
 303                        break;
 304                sb->len += cnt;
 305                strbuf_grow(sb, 8192);
 306        }
 307
 308        sb->buf[sb->len] = '\0';
 309        return sb->len - oldlen;
 310}
 311
 312#define STRBUF_MAXLINK (2*PATH_MAX)
 313
 314int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 315{
 316        size_t oldalloc = sb->alloc;
 317
 318        if (hint < 32)
 319                hint = 32;
 320
 321        while (hint < STRBUF_MAXLINK) {
 322                int len;
 323
 324                strbuf_grow(sb, hint);
 325                len = readlink(path, sb->buf, hint);
 326                if (len < 0) {
 327                        if (errno != ERANGE)
 328                                break;
 329                } else if (len < hint) {
 330                        strbuf_setlen(sb, len);
 331                        return 0;
 332                }
 333
 334                /* .. the buffer was too small - try again */
 335                hint *= 2;
 336        }
 337        if (oldalloc == 0)
 338                strbuf_release(sb);
 339        return -1;
 340}
 341
 342int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 343{
 344        int ch;
 345
 346        strbuf_grow(sb, 0);
 347        if (feof(fp))
 348                return EOF;
 349
 350        strbuf_reset(sb);
 351        while ((ch = fgetc(fp)) != EOF) {
 352                strbuf_grow(sb, 1);
 353                sb->buf[sb->len++] = ch;
 354                if (ch == term)
 355                        break;
 356        }
 357        if (ch == EOF && sb->len == 0)
 358                return EOF;
 359
 360        sb->buf[sb->len] = '\0';
 361        return 0;
 362}
 363
 364int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 365{
 366        if (strbuf_getwholeline(sb, fp, term))
 367                return EOF;
 368        if (sb->buf[sb->len-1] == term)
 369                strbuf_setlen(sb, sb->len-1);
 370        return 0;
 371}
 372
 373int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 374{
 375        int fd, len;
 376
 377        fd = open(path, O_RDONLY);
 378        if (fd < 0)
 379                return -1;
 380        len = strbuf_read(sb, fd, hint);
 381        close(fd);
 382        if (len < 0)
 383                return -1;
 384
 385        return len;
 386}
 387
 388int strbuf_branchname(struct strbuf *sb, const char *name)
 389{
 390        int len = strlen(name);
 391        if (interpret_branch_name(name, sb) == len)
 392                return 0;
 393        strbuf_add(sb, name, len);
 394        return len;
 395}
 396
 397int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 398{
 399        strbuf_branchname(sb, name);
 400        strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 401        return check_ref_format(sb->buf);
 402}