strbuf.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "string-list.h"
   4 #include "utf8.h"
   5
   6 int starts_with(const char *str, const char *prefix)
   7 {
   8         for (; ; str++, prefix++)
   9                 if (!*prefix)
  10                         return 1;
  11                 else if (*str != *prefix)
  12                         return 0;
  13 }
  14
  15 int istarts_with(const char *str, const char *prefix)
  16 {
  17         for (; ; str++, prefix++)
  18                 if (!*prefix)
  19                         return 1;
  20                 else if (tolower(*str) != tolower(*prefix))
  21                         return 0;
  22 }
  23
  24 int skip_to_optional_arg_default(const char *str, const char *prefix,
  25                                  const char **arg, const char *def)
  26 {
  27         const char *p;
  28
  29         if (!skip_prefix(str, prefix, &p))
  30                 return 0;
  31
  32         if (!*p) {
  33                 if (arg)
  34                         *arg = def;
  35                 return 1;
  36         }
  37
  38         if (*p != '=')
  39                 return 0;
  40
  41         if (arg)
  42                 *arg = p + 1;
  43         return 1;
  44 }
  45
  46 /*
  47  * Used as the default ->buf value, so that people can always assume
  48  * buf is non NULL and ->buf is NUL terminated even for a freshly
  49  * initialized strbuf.
  50  */
  51 char strbuf_slopbuf[1];
  52
  53 void strbuf_init(struct strbuf *sb, size_t hint)
  54 {
  55         sb->alloc = sb->len = 0;
  56         sb->buf = strbuf_slopbuf;
  57         if (hint)
  58                 strbuf_grow(sb, hint);
  59 }
  60
  61 void strbuf_release(struct strbuf *sb)
  62 {
  63         if (sb->alloc) {
  64                 free(sb->buf);
  65                 strbuf_init(sb, 0);
  66         }
  67 }
  68
  69 char *strbuf_detach(struct strbuf *sb, size_t *sz)
  70 {
  71         char *res;
  72         strbuf_grow(sb, 0);
  73         res = sb->buf;
  74         if (sz)
  75                 *sz = sb->len;
  76         strbuf_init(sb, 0);
  77         return res;
  78 }
  79
  80 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  81 {
  82         strbuf_release(sb);
  83         sb->buf   = buf;
  84         sb->len   = len;
  85         sb->alloc = alloc;
  86         strbuf_grow(sb, 0);
  87         sb->buf[sb->len] = '\0';
  88 }
  89
  90 void strbuf_grow(struct strbuf *sb, size_t extra)
  91 {
  92         int new_buf = !sb->alloc;
  93         if (unsigned_add_overflows(extra, 1) ||
  94             unsigned_add_overflows(sb->len, extra + 1))
  95                 die("you want to use way too much memory");
  96         if (new_buf)
  97                 sb->buf = NULL;
  98         ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
  99         if (new_buf)
 100                 sb->buf[0] = '\0';
 101 }
 102
 103 void strbuf_trim(struct strbuf *sb)
 104 {
 105         strbuf_rtrim(sb);
 106         strbuf_ltrim(sb);
 107 }
 108
 109 void strbuf_rtrim(struct strbuf *sb)
 110 {
 111         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
 112                 sb->len--;
 113         sb->buf[sb->len] = '\0';
 114 }
 115
 116 void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
 117 {
 118         while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
 119                 sb->len--;
 120         sb->buf[sb->len] = '\0';
 121 }
 122
 123 void strbuf_trim_trailing_newline(struct strbuf *sb)
 124 {
 125         if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
 126                 if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
 127                         --sb->len;
 128                 sb->buf[sb->len] = '\0';
 129         }
 130 }
 131
 132 void strbuf_ltrim(struct strbuf *sb)
 133 {
 134         char *b = sb->buf;
 135         while (sb->len > 0 && isspace(*b)) {
 136                 b++;
 137                 sb->len--;
 138         }
 139         memmove(sb->buf, b, sb->len);
 140         sb->buf[sb->len] = '\0';
 141 }
 142
 143 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
 144 {
 145         char *out;
 146         size_t len;
 147
 148         if (same_encoding(from, to))
 149                 return 0;
 150
 151         out = reencode_string_len(sb->buf, sb->len, to, from, &len);
 152         if (!out)
 153                 return -1;
 154
 155         strbuf_attach(sb, out, len, len);
 156         return 0;
 157 }
 158
 159 void strbuf_tolower(struct strbuf *sb)
 160 {
 161         char *p = sb->buf, *end = sb->buf + sb->len;
 162         for (; p < end; p++)
 163                 *p = tolower(*p);
 164 }
 165
 166 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
 167                                  int terminator, int max)
 168 {
 169         struct strbuf **ret = NULL;
 170         size_t nr = 0, alloc = 0;
 171         struct strbuf *t;
 172
 173         while (slen) {
 174                 int len = slen;
 175                 if (max <= 0 || nr + 1 < max) {
 176                         const char *end = memchr(str, terminator, slen);
 177                         if (end)
 178                                 len = end - str + 1;
 179                 }
 180                 t = xmalloc(sizeof(struct strbuf));
 181                 strbuf_init(t, len);
 182                 strbuf_add(t, str, len);
 183                 ALLOC_GROW(ret, nr + 2, alloc);
 184                 ret[nr++] = t;
 185                 str += len;
 186                 slen -= len;
 187         }
 188         ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
 189         ret[nr] = NULL;
 190         return ret;
 191 }
 192
 193 void strbuf_add_separated_string_list(struct strbuf *str,
 194                                       const char *sep,
 195                                       struct string_list *slist)
 196 {
 197         struct string_list_item *item;
 198         int sep_needed = 0;
 199
 200         for_each_string_list_item(item, slist) {
 201                 if (sep_needed)
 202                         strbuf_addstr(str, sep);
 203                 strbuf_addstr(str, item->string);
 204                 sep_needed = 1;
 205         }
 206 }
 207
 208 void strbuf_list_free(struct strbuf **sbs)
 209 {
 210         struct strbuf **s = sbs;
 211
 212         while (*s) {
 213                 strbuf_release(*s);
 214                 free(*s++);
 215         }
 216         free(sbs);
 217 }
 218
 219 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 220 {
 221         size_t len = a->len < b->len ? a->len: b->len;
 222         int cmp = memcmp(a->buf, b->buf, len);
 223         if (cmp)
 224                 return cmp;
 225         return a->len < b->len ? -1: a->len != b->len;
 226 }
 227
 228 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 229                                    const void *data, size_t dlen)
 230 {
 231         if (unsigned_add_overflows(pos, len))
 232                 die("you want to use way too much memory");
 233         if (pos > sb->len)
 234                 die("`pos' is too far after the end of the buffer");
 235         if (pos + len > sb->len)
 236                 die("`pos + len' is too far after the end of the buffer");
 237
 238         if (dlen >= len)
 239                 strbuf_grow(sb, dlen - len);
 240         memmove(sb->buf + pos + dlen,
 241                         sb->buf + pos + len,
 242                         sb->len - pos - len);
 243         memcpy(sb->buf + pos, data, dlen);
 244         strbuf_setlen(sb, sb->len + dlen - len);
 245 }
 246
 247 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 248 {
 249         strbuf_splice(sb, pos, 0, data, len);
 250 }
 251
 252 void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
 253 {
 254         int len, len2;
 255         char save;
 256         va_list cp;
 257
 258         if (pos > sb->len)
 259                 die("`pos' is too far after the end of the buffer");
 260         va_copy(cp, ap);
 261         len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
 262         va_end(cp);
 263         if (len < 0)
 264                 BUG("your vsnprintf is broken (returned %d)", len);
 265         if (!len)
 266                 return; /* nothing to do */
 267         if (unsigned_add_overflows(sb->len, len))
 268                 die("you want to use way too much memory");
 269         strbuf_grow(sb, len);
 270         memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
 271         /* vsnprintf() will append a NUL, overwriting one of our characters */
 272         save = sb->buf[pos + len];
 273         len2 = vsnprintf(sb->buf + pos, len + 1, fmt, ap);
 274         sb->buf[pos + len] = save;
 275         if (len2 != len)
 276                 BUG("your vsnprintf is broken (returns inconsistent lengths)");
 277         strbuf_setlen(sb, sb->len + len);
 278 }
 279
 280 void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
 281 {
 282         va_list ap;
 283         va_start(ap, fmt);
 284         strbuf_vinsertf(sb, pos, fmt, ap);
 285         va_end(ap);
 286 }
 287
 288 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 289 {
 290         strbuf_splice(sb, pos, len, "", 0);
 291 }
 292
 293 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 294 {
 295         strbuf_grow(sb, len);
 296         memcpy(sb->buf + sb->len, data, len);
 297         strbuf_setlen(sb, sb->len + len);
 298 }
 299
 300 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 301 {
 302         strbuf_grow(sb, sb2->len);
 303         memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
 304         strbuf_setlen(sb, sb->len + sb2->len);
 305 }
 306
 307 const char *strbuf_join_argv(struct strbuf *buf,
 308                              int argc, const char **argv, char delim)
 309 {
 310         if (!argc)
 311                 return buf->buf;
 312
 313         strbuf_addstr(buf, *argv);
 314         while (--argc) {
 315                 strbuf_addch(buf, delim);
 316                 strbuf_addstr(buf, *(++argv));
 317         }
 318
 319         return buf->buf;
 320 }
 321
 322 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 323 {
 324         strbuf_grow(sb, n);
 325         memset(sb->buf + sb->len, c, n);
 326         strbuf_setlen(sb, sb->len + n);
 327 }
 328
 329 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 330 {
 331         va_list ap;
 332         va_start(ap, fmt);
 333         strbuf_vaddf(sb, fmt, ap);
 334         va_end(ap);
 335 }
 336
 337 static void add_lines(struct strbuf *out,
 338                         const char *prefix1,
 339                         const char *prefix2,
 340                         const char *buf, size_t size)
 341 {
 342         while (size) {
 343                 const char *prefix;
 344                 const char *next = memchr(buf, '\n', size);
 345                 next = next ? (next + 1) : (buf + size);
 346
 347                 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
 348                           ? prefix2 : prefix1);
 349                 strbuf_addstr(out, prefix);
 350                 strbuf_add(out, buf, next - buf);
 351                 size -= next - buf;
 352                 buf = next;
 353         }
 354         strbuf_complete_line(out);
 355 }
 356
 357 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
 358 {
 359         static char prefix1[3];
 360         static char prefix2[2];
 361
 362         if (prefix1[0] != comment_line_char) {
 363                 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
 364                 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
 365         }
 366         add_lines(out, prefix1, prefix2, buf, size);
 367 }
 368
 369 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
 370 {
 371         va_list params;
 372         struct strbuf buf = STRBUF_INIT;
 373         int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
 374
 375         va_start(params, fmt);
 376         strbuf_vaddf(&buf, fmt, params);
 377         va_end(params);
 378
 379         strbuf_add_commented_lines(sb, buf.buf, buf.len);
 380         if (incomplete_line)
 381                 sb->buf[--sb->len] = '\0';
 382
 383         strbuf_release(&buf);
 384 }
 385
 386 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 387 {
 388         int len;
 389         va_list cp;
 390
 391         if (!strbuf_avail(sb))
 392                 strbuf_grow(sb, 64);
 393         va_copy(cp, ap);
 394         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 395         va_end(cp);
 396         if (len < 0)
 397                 BUG("your vsnprintf is broken (returned %d)", len);
 398         if (len > strbuf_avail(sb)) {
 399                 strbuf_grow(sb, len);
 400                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 401                 if (len > strbuf_avail(sb))
 402                         BUG("your vsnprintf is broken (insatiable)");
 403         }
 404         strbuf_setlen(sb, sb->len + len);
 405 }
 406
 407 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 408                    void *context)
 409 {
 410         for (;;) {
 411                 const char *percent;
 412                 size_t consumed;
 413
 414                 percent = strchrnul(format, '%');
 415                 strbuf_add(sb, format, percent - format);
 416                 if (!*percent)
 417                         break;
 418                 format = percent + 1;
 419
 420                 if (*format == '%') {
 421                         strbuf_addch(sb, '%');
 422                         format++;
 423                         continue;
 424                 }
 425
 426                 consumed = fn(sb, format, context);
 427                 if (consumed)
 428                         format += consumed;
 429                 else
 430                         strbuf_addch(sb, '%');
 431         }
 432 }
 433
 434 size_t strbuf_expand_literal_cb(struct strbuf *sb,
 435                                 const char *placeholder,
 436                                 void *context)
 437 {
 438         int ch;
 439
 440         switch (placeholder[0]) {
 441         case 'n':               /* newline */
 442                 strbuf_addch(sb, '\n');
 443                 return 1;
 444         case 'x':
 445                 /* %x00 == NUL, %x0a == LF, etc. */
 446                 ch = hex2chr(placeholder + 1);
 447                 if (ch < 0)
 448                         return 0;
 449                 strbuf_addch(sb, ch);
 450                 return 3;
 451         }
 452         return 0;
 453 }
 454
 455 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 456                 void *context)
 457 {
 458         struct strbuf_expand_dict_entry *e = context;
 459         size_t len;
 460
 461         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 462                 if (!strncmp(placeholder, e->placeholder, len)) {
 463                         if (e->value)
 464                                 strbuf_addstr(sb, e->value);
 465                         return len;
 466                 }
 467         }
 468         return 0;
 469 }
 470
 471 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 472 {
 473         size_t i, len = src->len;
 474
 475         for (i = 0; i < len; i++) {
 476                 if (src->buf[i] == '%')
 477                         strbuf_addch(dst, '%');
 478                 strbuf_addch(dst, src->buf[i]);
 479         }
 480 }
 481
 482 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 483 {
 484         size_t res;
 485         size_t oldalloc = sb->alloc;
 486
 487         strbuf_grow(sb, size);
 488         res = fread(sb->buf + sb->len, 1, size, f);
 489         if (res > 0)
 490                 strbuf_setlen(sb, sb->len + res);
 491         else if (oldalloc == 0)
 492                 strbuf_release(sb);
 493         return res;
 494 }
 495
 496 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 497 {
 498         size_t oldlen = sb->len;
 499         size_t oldalloc = sb->alloc;
 500
 501         strbuf_grow(sb, hint ? hint : 8192);
 502         for (;;) {
 503                 ssize_t want = sb->alloc - sb->len - 1;
 504                 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
 505
 506                 if (got < 0) {
 507                         if (oldalloc == 0)
 508                                 strbuf_release(sb);
 509                         else
 510                                 strbuf_setlen(sb, oldlen);
 511                         return -1;
 512                 }
 513                 sb->len += got;
 514                 if (got < want)
 515                         break;
 516                 strbuf_grow(sb, 8192);
 517         }
 518
 519         sb->buf[sb->len] = '\0';
 520         return sb->len - oldlen;
 521 }
 522
 523 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 524 {
 525         size_t oldalloc = sb->alloc;
 526         ssize_t cnt;
 527
 528         strbuf_grow(sb, hint ? hint : 8192);
 529         cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 530         if (cnt > 0)
 531                 strbuf_setlen(sb, sb->len + cnt);
 532         else if (oldalloc == 0)
 533                 strbuf_release(sb);
 534         return cnt;
 535 }
 536
 537 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 538 {
 539         return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 540 }
 541
 542
 543 #define STRBUF_MAXLINK (2*PATH_MAX)
 544
 545 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 546 {
 547         size_t oldalloc = sb->alloc;
 548
 549         if (hint < 32)
 550                 hint = 32;
 551
 552         while (hint < STRBUF_MAXLINK) {
 553                 ssize_t len;
 554
 555                 strbuf_grow(sb, hint);
 556                 len = readlink(path, sb->buf, hint);
 557                 if (len < 0) {
 558                         if (errno != ERANGE)
 559                                 break;
 560                 } else if (len < hint) {
 561                         strbuf_setlen(sb, len);
 562                         return 0;
 563                 }
 564
 565                 /* .. the buffer was too small - try again */
 566                 hint *= 2;
 567         }
 568         if (oldalloc == 0)
 569                 strbuf_release(sb);
 570         return -1;
 571 }
 572
 573 int strbuf_getcwd(struct strbuf *sb)
 574 {
 575         size_t oldalloc = sb->alloc;
 576         size_t guessed_len = 128;
 577
 578         for (;; guessed_len *= 2) {
 579                 strbuf_grow(sb, guessed_len);
 580                 if (getcwd(sb->buf, sb->alloc)) {
 581                         strbuf_setlen(sb, strlen(sb->buf));
 582                         return 0;
 583                 }
 584
 585                 /*
 586                  * If getcwd(3) is implemented as a syscall that falls
 587                  * back to a regular lookup using readdir(3) etc. then
 588                  * we may be able to avoid EACCES by providing enough
 589                  * space to the syscall as it's not necessarily bound
 590                  * to the same restrictions as the fallback.
 591                  */
 592                 if (errno == EACCES && guessed_len < PATH_MAX)
 593                         continue;
 594
 595                 if (errno != ERANGE)
 596                         break;
 597         }
 598         if (oldalloc == 0)
 599                 strbuf_release(sb);
 600         else
 601                 strbuf_reset(sb);
 602         return -1;
 603 }
 604
 605 #ifdef HAVE_GETDELIM
 606 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 607 {
 608         ssize_t r;
 609
 610         if (feof(fp))
 611                 return EOF;
 612
 613         strbuf_reset(sb);
 614
 615         /* Translate slopbuf to NULL, as we cannot call realloc on it */
 616         if (!sb->alloc)
 617                 sb->buf = NULL;
 618         errno = 0;
 619         r = getdelim(&sb->buf, &sb->alloc, term, fp);
 620
 621         if (r > 0) {
 622                 sb->len = r;
 623                 return 0;
 624         }
 625         assert(r == -1);
 626
 627         /*
 628          * Normally we would have called xrealloc, which will try to free
 629          * memory and recover. But we have no way to tell getdelim() to do so.
 630          * Worse, we cannot try to recover ENOMEM ourselves, because we have
 631          * no idea how many bytes were read by getdelim.
 632          *
 633          * Dying here is reasonable. It mirrors what xrealloc would do on
 634          * catastrophic memory failure. We skip the opportunity to free pack
 635          * memory and retry, but that's unlikely to help for a malloc small
 636          * enough to hold a single line of input, anyway.
 637          */
 638         if (errno == ENOMEM)
 639                 die("Out of memory, getdelim failed");
 640
 641         /*
 642          * Restore strbuf invariants; if getdelim left us with a NULL pointer,
 643          * we can just re-init, but otherwise we should make sure that our
 644          * length is empty, and that the result is NUL-terminated.
 645          */
 646         if (!sb->buf)
 647                 strbuf_init(sb, 0);
 648         else
 649                 strbuf_reset(sb);
 650         return EOF;
 651 }
 652 #else
 653 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 654 {
 655         int ch;
 656
 657         if (feof(fp))
 658                 return EOF;
 659
 660         strbuf_reset(sb);
 661         flockfile(fp);
 662         while ((ch = getc_unlocked(fp)) != EOF) {
 663                 if (!strbuf_avail(sb))
 664                         strbuf_grow(sb, 1);
 665                 sb->buf[sb->len++] = ch;
 666                 if (ch == term)
 667                         break;
 668         }
 669         funlockfile(fp);
 670         if (ch == EOF && sb->len == 0)
 671                 return EOF;
 672
 673         sb->buf[sb->len] = '\0';
 674         return 0;
 675 }
 676 #endif
 677
 678 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
 679 {
 680         if (strbuf_getwholeline(sb, fp, term))
 681                 return EOF;
 682         if (sb->buf[sb->len - 1] == term)
 683                 strbuf_setlen(sb, sb->len - 1);
 684         return 0;
 685 }
 686
 687 int strbuf_getline(struct strbuf *sb, FILE *fp)
 688 {
 689         if (strbuf_getwholeline(sb, fp, '\n'))
 690                 return EOF;
 691         if (sb->buf[sb->len - 1] == '\n') {
 692                 strbuf_setlen(sb, sb->len - 1);
 693                 if (sb->len && sb->buf[sb->len - 1] == '\r')
 694                         strbuf_setlen(sb, sb->len - 1);
 695         }
 696         return 0;
 697 }
 698
 699 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 700 {
 701         return strbuf_getdelim(sb, fp, '\n');
 702 }
 703
 704 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 705 {
 706         return strbuf_getdelim(sb, fp, '\0');
 707 }
 708
 709 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 710 {
 711         strbuf_reset(sb);
 712
 713         while (1) {
 714                 char ch;
 715                 ssize_t len = xread(fd, &ch, 1);
 716                 if (len <= 0)
 717                         return EOF;
 718                 strbuf_addch(sb, ch);
 719                 if (ch == term)
 720                         break;
 721         }
 722         return 0;
 723 }
 724
 725 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 726 {
 727         int fd;
 728         ssize_t len;
 729         int saved_errno;
 730
 731         fd = open(path, O_RDONLY);
 732         if (fd < 0)
 733                 return -1;
 734         len = strbuf_read(sb, fd, hint);
 735         saved_errno = errno;
 736         close(fd);
 737         if (len < 0) {
 738                 errno = saved_errno;
 739                 return -1;
 740         }
 741
 742         return len;
 743 }
 744
 745 void strbuf_add_lines(struct strbuf *out, const char *prefix,
 746                       const char *buf, size_t size)
 747 {
 748         add_lines(out, prefix, NULL, buf, size);
 749 }
 750
 751 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
 752 {
 753         while (*s) {
 754                 size_t len = strcspn(s, "\"<>&");
 755                 strbuf_add(buf, s, len);
 756                 s += len;
 757                 switch (*s) {
 758                 case '"':
 759                         strbuf_addstr(buf, "&quot;");
 760                         break;
 761                 case '<':
 762                         strbuf_addstr(buf, "&lt;");
 763                         break;
 764                 case '>':
 765                         strbuf_addstr(buf, "&gt;");
 766                         break;
 767                 case '&':
 768                         strbuf_addstr(buf, "&amp;");
 769                         break;
 770                 case 0:
 771                         return;
 772                 }
 773                 s++;
 774         }
 775 }
 776
 777 static int is_rfc3986_reserved(char ch)
 778 {
 779         switch (ch) {
 780                 case '!': case '*': case '\'': case '(': case ')': case ';':
 781                 case ':': case '@': case '&': case '=': case '+': case '$':
 782                 case ',': case '/': case '?': case '#': case '[': case ']':
 783                         return 1;
 784         }
 785         return 0;
 786 }
 787
 788 static int is_rfc3986_unreserved(char ch)
 789 {
 790         return isalnum(ch) ||
 791                 ch == '-' || ch == '_' || ch == '.' || ch == '~';
 792 }
 793
 794 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 795                                  int reserved)
 796 {
 797         strbuf_grow(sb, len);
 798         while (len--) {
 799                 char ch = *s++;
 800                 if (is_rfc3986_unreserved(ch) ||
 801                     (!reserved && is_rfc3986_reserved(ch)))
 802                         strbuf_addch(sb, ch);
 803                 else
 804                         strbuf_addf(sb, "%%%02x", (unsigned char)ch);
 805         }
 806 }
 807
 808 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 809                              int reserved)
 810 {
 811         strbuf_add_urlencode(sb, s, strlen(s), reserved);
 812 }
 813
 814 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
 815 {
 816         if (bytes > 1 << 30) {
 817                 strbuf_addf(buf, "%u.%2.2u GiB",
 818                             (unsigned)(bytes >> 30),
 819                             (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
 820         } else if (bytes > 1 << 20) {
 821                 unsigned x = bytes + 5243;  /* for rounding */
 822                 strbuf_addf(buf, "%u.%2.2u MiB",
 823                             x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 824         } else if (bytes > 1 << 10) {
 825                 unsigned x = bytes + 5;  /* for rounding */
 826                 strbuf_addf(buf, "%u.%2.2u KiB",
 827                             x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 828         } else {
 829                 strbuf_addf(buf, "%u bytes", (unsigned)bytes);
 830         }
 831 }
 832
 833 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
 834 {
 835         if (!*path)
 836                 die("The empty string is not a valid path");
 837         if (!is_absolute_path(path)) {
 838                 struct stat cwd_stat, pwd_stat;
 839                 size_t orig_len = sb->len;
 840                 char *cwd = xgetcwd();
 841                 char *pwd = getenv("PWD");
 842                 if (pwd && strcmp(pwd, cwd) &&
 843                     !stat(cwd, &cwd_stat) &&
 844                     (cwd_stat.st_dev || cwd_stat.st_ino) &&
 845                     !stat(pwd, &pwd_stat) &&
 846                     pwd_stat.st_dev == cwd_stat.st_dev &&
 847                     pwd_stat.st_ino == cwd_stat.st_ino)
 848                         strbuf_addstr(sb, pwd);
 849                 else
 850                         strbuf_addstr(sb, cwd);
 851                 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
 852                         strbuf_addch(sb, '/');
 853                 free(cwd);
 854         }
 855         strbuf_addstr(sb, path);
 856 }
 857
 858 void strbuf_add_real_path(struct strbuf *sb, const char *path)
 859 {
 860         if (sb->len) {
 861                 struct strbuf resolved = STRBUF_INIT;
 862                 strbuf_realpath(&resolved, path, 1);
 863                 strbuf_addbuf(sb, &resolved);
 864                 strbuf_release(&resolved);
 865         } else
 866                 strbuf_realpath(sb, path, 1);
 867 }
 868
 869 int printf_ln(const char *fmt, ...)
 870 {
 871         int ret;
 872         va_list ap;
 873         va_start(ap, fmt);
 874         ret = vprintf(fmt, ap);
 875         va_end(ap);
 876         if (ret < 0 || putchar('\n') == EOF)
 877                 return -1;
 878         return ret + 1;
 879 }
 880
 881 int fprintf_ln(FILE *fp, const char *fmt, ...)
 882 {
 883         int ret;
 884         va_list ap;
 885         va_start(ap, fmt);
 886         ret = vfprintf(fp, fmt, ap);
 887         va_end(ap);
 888         if (ret < 0 || putc('\n', fp) == EOF)
 889                 return -1;
 890         return ret + 1;
 891 }
 892
 893 char *xstrdup_tolower(const char *string)
 894 {
 895         char *result;
 896         size_t len, i;
 897
 898         len = strlen(string);
 899         result = xmallocz(len);
 900         for (i = 0; i < len; i++)
 901                 result[i] = tolower(string[i]);
 902         return result;
 903 }
 904
 905 char *xstrdup_toupper(const char *string)
 906 {
 907         char *result;
 908         size_t len, i;
 909
 910         len = strlen(string);
 911         result = xmallocz(len);
 912         for (i = 0; i < len; i++)
 913                 result[i] = toupper(string[i]);
 914         return result;
 915 }
 916
 917 char *xstrvfmt(const char *fmt, va_list ap)
 918 {
 919         struct strbuf buf = STRBUF_INIT;
 920         strbuf_vaddf(&buf, fmt, ap);
 921         return strbuf_detach(&buf, NULL);
 922 }
 923
 924 char *xstrfmt(const char *fmt, ...)
 925 {
 926         va_list ap;
 927         char *ret;
 928
 929         va_start(ap, fmt);
 930         ret = xstrvfmt(fmt, ap);
 931         va_end(ap);
 932
 933         return ret;
 934 }
 935
 936 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 937                      int tz_offset, int suppress_tz_name)
 938 {
 939         struct strbuf munged_fmt = STRBUF_INIT;
 940         size_t hint = 128;
 941         size_t len;
 942
 943         if (!*fmt)
 944                 return;
 945
 946         /*
 947          * There is no portable way to pass timezone information to
 948          * strftime, so we handle %z and %Z here.
 949          */
 950         for (;;) {
 951                 const char *percent = strchrnul(fmt, '%');
 952                 strbuf_add(&munged_fmt, fmt, percent - fmt);
 953                 if (!*percent)
 954                         break;
 955                 fmt = percent + 1;
 956                 switch (*fmt) {
 957                 case '%':
 958                         strbuf_addstr(&munged_fmt, "%%");
 959                         fmt++;
 960                         break;
 961                 case 'z':
 962                         strbuf_addf(&munged_fmt, "%+05d", tz_offset);
 963                         fmt++;
 964                         break;
 965                 case 'Z':
 966                         if (suppress_tz_name) {
 967                                 fmt++;
 968                                 break;
 969                         }
 970                         /* FALLTHROUGH */
 971                 default:
 972                         strbuf_addch(&munged_fmt, '%');
 973                 }
 974         }
 975         fmt = munged_fmt.buf;
 976
 977         strbuf_grow(sb, hint);
 978         len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
 979
 980         if (!len) {
 981                 /*
 982                  * strftime reports "0" if it could not fit the result in the buffer.
 983                  * Unfortunately, it also reports "0" if the requested time string
 984                  * takes 0 bytes. So our strategy is to munge the format so that the
 985                  * output contains at least one character, and then drop the extra
 986                  * character before returning.
 987                  */
 988                 strbuf_addch(&munged_fmt, ' ');
 989                 while (!len) {
 990                         hint *= 2;
 991                         strbuf_grow(sb, hint);
 992                         len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
 993                                        munged_fmt.buf, tm);
 994                 }
 995                 len--; /* drop munged space */
 996         }
 997         strbuf_release(&munged_fmt);
 998         strbuf_setlen(sb, sb->len + len);
 999 }
1000
1001 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
1002                               int abbrev_len)
1003 {
1004         int r;
1005         strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
1006         r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
1007         strbuf_setlen(sb, sb->len + r);
1008 }
1009
1010 /*
1011  * Returns the length of a line, without trailing spaces.
1012  *
1013  * If the line ends with newline, it will be removed too.
1014  */
1015 static size_t cleanup(char *line, size_t len)
1016 {
1017         while (len) {
1018                 unsigned char c = line[len - 1];
1019                 if (!isspace(c))
1020                         break;
1021                 len--;
1022         }
1023
1024         return len;
1025 }
1026
1027 /*
1028  * Remove empty lines from the beginning and end
1029  * and also trailing spaces from every line.
1030  *
1031  * Turn multiple consecutive empty lines between paragraphs
1032  * into just one empty line.
1033  *
1034  * If the input has only empty lines and spaces,
1035  * no output will be produced.
1036  *
1037  * If last line does not have a newline at the end, one is added.
1038  *
1039  * Enable skip_comments to skip every line starting with comment
1040  * character.
1041  */
1042 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
1043 {
1044         size_t empties = 0;
1045         size_t i, j, len, newlen;
1046         char *eol;
1047
1048         /* We may have to add a newline. */
1049         strbuf_grow(sb, 1);
1050
1051         for (i = j = 0; i < sb->len; i += len, j += newlen) {
1052                 eol = memchr(sb->buf + i, '\n', sb->len - i);
1053                 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
1054
1055                 if (skip_comments && len && sb->buf[i] == comment_line_char) {
1056                         newlen = 0;
1057                         continue;
1058                 }
1059                 newlen = cleanup(sb->buf + i, len);
1060
1061                 /* Not just an empty line? */
1062                 if (newlen) {
1063                         if (empties > 0 && j > 0)
1064                                 sb->buf[j++] = '\n';
1065                         empties = 0;
1066                         memmove(sb->buf + j, sb->buf + i, newlen);
1067                         sb->buf[newlen + j++] = '\n';
1068                 } else {
1069                         empties++;
1070                 }
1071         }
1072
1073         strbuf_setlen(sb, j);
1074 }
1075
1076 int strbuf_normalize_path(struct strbuf *src)
1077 {
1078         struct strbuf dst = STRBUF_INIT;
1079
1080         strbuf_grow(&dst, src->len);
1081         if (normalize_path_copy(dst.buf, src->buf) < 0) {
1082                 strbuf_release(&dst);
1083                 return -1;
1084         }
1085
1086         /*
1087          * normalize_path does not tell us the new length, so we have to
1088          * compute it by looking for the new NUL it placed
1089          */
1090         strbuf_setlen(&dst, strlen(dst.buf));
1091         strbuf_swap(src, &dst);
1092         strbuf_release(&dst);
1093         return 0;
1094 }