Andrew's git / gitweb.git / strbuf.c
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strbuf.con commit lstat_cache(): print a warning if doing ping-pong between cache types (7734f04)
   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 cmp;
 143        if (a->len < b->len) {
 144                cmp = memcmp(a->buf, b->buf, a->len);
 145                return cmp ? cmp : -1;
 146        } else {
 147                cmp = memcmp(a->buf, b->buf, b->len);
 148                return cmp ? cmp : a->len != b->len;
 149        }
 150}
 151
 152void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 153                                   const void *data, size_t dlen)
 154{
 155        if (pos + len < pos)
 156                die("you want to use way too much memory");
 157        if (pos > sb->len)
 158                die("`pos' is too far after the end of the buffer");
 159        if (pos + len > sb->len)
 160                die("`pos + len' is too far after the end of the buffer");
 161
 162        if (dlen >= len)
 163                strbuf_grow(sb, dlen - len);
 164        memmove(sb->buf + pos + dlen,
 165                        sb->buf + pos + len,
 166                        sb->len - pos - len);
 167        memcpy(sb->buf + pos, data, dlen);
 168        strbuf_setlen(sb, sb->len + dlen - len);
 169}
 170
 171void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 172{
 173        strbuf_splice(sb, pos, 0, data, len);
 174}
 175
 176void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 177{
 178        strbuf_splice(sb, pos, len, NULL, 0);
 179}
 180
 181void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 182{
 183        strbuf_grow(sb, len);
 184        memcpy(sb->buf + sb->len, data, len);
 185        strbuf_setlen(sb, sb->len + len);
 186}
 187
 188void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
 189{
 190        strbuf_grow(sb, len);
 191        memcpy(sb->buf + sb->len, sb->buf + pos, len);
 192        strbuf_setlen(sb, sb->len + len);
 193}
 194
 195void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 196{
 197        int len;
 198        va_list ap;
 199
 200        if (!strbuf_avail(sb))
 201                strbuf_grow(sb, 64);
 202        va_start(ap, fmt);
 203        len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 204        va_end(ap);
 205        if (len < 0)
 206                die("your vsnprintf is broken");
 207        if (len > strbuf_avail(sb)) {
 208                strbuf_grow(sb, len);
 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 > strbuf_avail(sb)) {
 213                        die("this should not happen, your snprintf is broken");
 214                }
 215        }
 216        strbuf_setlen(sb, sb->len + len);
 217}
 218
 219void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 220                   void *context)
 221{
 222        for (;;) {
 223                const char *percent;
 224                size_t consumed;
 225
 226                percent = strchrnul(format, '%');
 227                strbuf_add(sb, format, percent - format);
 228                if (!*percent)
 229                        break;
 230                format = percent + 1;
 231
 232                consumed = fn(sb, format, context);
 233                if (consumed)
 234                        format += consumed;
 235                else
 236                        strbuf_addch(sb, '%');
 237        }
 238}
 239
 240size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 241                void *context)
 242{
 243        struct strbuf_expand_dict_entry *e = context;
 244        size_t len;
 245
 246        for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 247                if (!strncmp(placeholder, e->placeholder, len)) {
 248                        if (e->value)
 249                                strbuf_addstr(sb, e->value);
 250                        return len;
 251                }
 252        }
 253        return 0;
 254}
 255
 256size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 257{
 258        size_t res;
 259        size_t oldalloc = sb->alloc;
 260
 261        strbuf_grow(sb, size);
 262        res = fread(sb->buf + sb->len, 1, size, f);
 263        if (res > 0)
 264                strbuf_setlen(sb, sb->len + res);
 265        else if (res < 0 && oldalloc == 0)
 266                strbuf_release(sb);
 267        return res;
 268}
 269
 270ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 271{
 272        size_t oldlen = sb->len;
 273        size_t oldalloc = sb->alloc;
 274
 275        strbuf_grow(sb, hint ? hint : 8192);
 276        for (;;) {
 277                ssize_t cnt;
 278
 279                cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 280                if (cnt < 0) {
 281                        if (oldalloc == 0)
 282                                strbuf_release(sb);
 283                        else
 284                                strbuf_setlen(sb, oldlen);
 285                        return -1;
 286                }
 287                if (!cnt)
 288                        break;
 289                sb->len += cnt;
 290                strbuf_grow(sb, 8192);
 291        }
 292
 293        sb->buf[sb->len] = '\0';
 294        return sb->len - oldlen;
 295}
 296
 297#define STRBUF_MAXLINK (2*PATH_MAX)
 298
 299int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 300{
 301        size_t oldalloc = sb->alloc;
 302
 303        if (hint < 32)
 304                hint = 32;
 305
 306        while (hint < STRBUF_MAXLINK) {
 307                int len;
 308
 309                strbuf_grow(sb, hint);
 310                len = readlink(path, sb->buf, hint);
 311                if (len < 0) {
 312                        if (errno != ERANGE)
 313                                break;
 314                } else if (len < hint) {
 315                        strbuf_setlen(sb, len);
 316                        return 0;
 317                }
 318
 319                /* .. the buffer was too small - try again */
 320                hint *= 2;
 321        }
 322        if (oldalloc == 0)
 323                strbuf_release(sb);
 324        return -1;
 325}
 326
 327int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 328{
 329        int ch;
 330
 331        strbuf_grow(sb, 0);
 332        if (feof(fp))
 333                return EOF;
 334
 335        strbuf_reset(sb);
 336        while ((ch = fgetc(fp)) != EOF) {
 337                if (ch == term)
 338                        break;
 339                strbuf_grow(sb, 1);
 340                sb->buf[sb->len++] = ch;
 341        }
 342        if (ch == EOF && sb->len == 0)
 343                return EOF;
 344
 345        sb->buf[sb->len] = '\0';
 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}