strbuf.c

   1 #include "git-compat-util.h"
   2 #include "gettext.h"
   3 #include "hex-ll.h"
   4 #include "strbuf.h"
   5 #include "string-list.h"
   6 #include "utf8.h"
   7 #include "date.h"
   8
   9 int starts_with(const char *str, const char *prefix)
  10 {
  11         for (; ; str++, prefix++)
  12                 if (!*prefix)
  13                         return 1;
  14                 else if (*str != *prefix)
  15                         return 0;
  16 }
  17
  18 int istarts_with(const char *str, const char *prefix)
  19 {
  20         for (; ; str++, prefix++)
  21                 if (!*prefix)
  22                         return 1;
  23                 else if (tolower(*str) != tolower(*prefix))
  24                         return 0;
  25 }
  26
  27 int skip_to_optional_arg_default(const char *str, const char *prefix,
  28                                  const char **arg, const char *def)
  29 {
  30         const char *p;
  31
  32         if (!skip_prefix(str, prefix, &p))
  33                 return 0;
  34
  35         if (!*p) {
  36                 if (arg)
  37                         *arg = def;
  38                 return 1;
  39         }
  40
  41         if (*p != '=')
  42                 return 0;
  43
  44         if (arg)
  45                 *arg = p + 1;
  46         return 1;
  47 }
  48
  49 /*
  50  * Used as the default ->buf value, so that people can always assume
  51  * buf is non NULL and ->buf is NUL terminated even for a freshly
  52  * initialized strbuf.
  53  */
  54 char strbuf_slopbuf[1];
  55
  56 void strbuf_init(struct strbuf *sb, size_t hint)
  57 {
  58         struct strbuf blank = STRBUF_INIT;
  59         memcpy(sb, &blank, sizeof(*sb));
  60         if (hint)
  61                 strbuf_grow(sb, hint);
  62 }
  63
  64 void strbuf_release(struct strbuf *sb)
  65 {
  66         if (sb->alloc) {
  67                 free(sb->buf);
  68                 strbuf_init(sb, 0);
  69         }
  70 }
  71
  72 char *strbuf_detach(struct strbuf *sb, size_t *sz)
  73 {
  74         char *res;
  75         strbuf_grow(sb, 0);
  76         res = sb->buf;
  77         if (sz)
  78                 *sz = sb->len;
  79         strbuf_init(sb, 0);
  80         return res;
  81 }
  82
  83 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  84 {
  85         strbuf_release(sb);
  86         sb->buf   = buf;
  87         sb->len   = len;
  88         sb->alloc = alloc;
  89         strbuf_grow(sb, 0);
  90         sb->buf[sb->len] = '\0';
  91 }
  92
  93 void strbuf_grow(struct strbuf *sb, size_t extra)
  94 {
  95         int new_buf = !sb->alloc;
  96         if (unsigned_add_overflows(extra, 1) ||
  97             unsigned_add_overflows(sb->len, extra + 1))
  98                 die("you want to use way too much memory");
  99         if (new_buf)
 100                 sb->buf = NULL;
 101         ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
 102         if (new_buf)
 103                 sb->buf[0] = '\0';
 104 }
 105
 106 void strbuf_trim(struct strbuf *sb)
 107 {
 108         strbuf_rtrim(sb);
 109         strbuf_ltrim(sb);
 110 }
 111
 112 void strbuf_rtrim(struct strbuf *sb)
 113 {
 114         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
 115                 sb->len--;
 116         sb->buf[sb->len] = '\0';
 117 }
 118
 119 void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
 120 {
 121         while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
 122                 sb->len--;
 123         sb->buf[sb->len] = '\0';
 124 }
 125
 126 void strbuf_trim_trailing_newline(struct strbuf *sb)
 127 {
 128         if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
 129                 if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
 130                         --sb->len;
 131                 sb->buf[sb->len] = '\0';
 132         }
 133 }
 134
 135 void strbuf_ltrim(struct strbuf *sb)
 136 {
 137         char *b = sb->buf;
 138         while (sb->len > 0 && isspace(*b)) {
 139                 b++;
 140                 sb->len--;
 141         }
 142         memmove(sb->buf, b, sb->len);
 143         sb->buf[sb->len] = '\0';
 144 }
 145
 146 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
 147 {
 148         char *out;
 149         size_t len;
 150
 151         if (same_encoding(from, to))
 152                 return 0;
 153
 154         out = reencode_string_len(sb->buf, sb->len, to, from, &len);
 155         if (!out)
 156                 return -1;
 157
 158         strbuf_attach(sb, out, len, len);
 159         return 0;
 160 }
 161
 162 void strbuf_tolower(struct strbuf *sb)
 163 {
 164         char *p = sb->buf, *end = sb->buf + sb->len;
 165         for (; p < end; p++)
 166                 *p = tolower(*p);
 167 }
 168
 169 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
 170                                  int terminator, int max)
 171 {
 172         struct strbuf **ret = NULL;
 173         size_t nr = 0, alloc = 0;
 174         struct strbuf *t;
 175
 176         while (slen) {
 177                 int len = slen;
 178                 if (max <= 0 || nr + 1 < max) {
 179                         const char *end = memchr(str, terminator, slen);
 180                         if (end)
 181                                 len = end - str + 1;
 182                 }
 183                 t = xmalloc(sizeof(struct strbuf));
 184                 strbuf_init(t, len);
 185                 strbuf_add(t, str, len);
 186                 ALLOC_GROW(ret, nr + 2, alloc);
 187                 ret[nr++] = t;
 188                 str += len;
 189                 slen -= len;
 190         }
 191         ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
 192         ret[nr] = NULL;
 193         return ret;
 194 }
 195
 196 void strbuf_add_separated_string_list(struct strbuf *str,
 197                                       const char *sep,
 198                                       struct string_list *slist)
 199 {
 200         struct string_list_item *item;
 201         int sep_needed = 0;
 202
 203         for_each_string_list_item(item, slist) {
 204                 if (sep_needed)
 205                         strbuf_addstr(str, sep);
 206                 strbuf_addstr(str, item->string);
 207                 sep_needed = 1;
 208         }
 209 }
 210
 211 void strbuf_list_free(struct strbuf **sbs)
 212 {
 213         struct strbuf **s = sbs;
 214
 215         if (!s)
 216                 return;
 217         while (*s) {
 218                 strbuf_release(*s);
 219                 free(*s++);
 220         }
 221         free(sbs);
 222 }
 223
 224 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 225 {
 226         size_t len = a->len < b->len ? a->len: b->len;
 227         int cmp = memcmp(a->buf, b->buf, len);
 228         if (cmp)
 229                 return cmp;
 230         return a->len < b->len ? -1: a->len != b->len;
 231 }
 232
 233 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 234                                    const void *data, size_t dlen)
 235 {
 236         if (unsigned_add_overflows(pos, len))
 237                 die("you want to use way too much memory");
 238         if (pos > sb->len)
 239                 die("`pos' is too far after the end of the buffer");
 240         if (pos + len > sb->len)
 241                 die("`pos + len' is too far after the end of the buffer");
 242
 243         if (dlen >= len)
 244                 strbuf_grow(sb, dlen - len);
 245         memmove(sb->buf + pos + dlen,
 246                         sb->buf + pos + len,
 247                         sb->len - pos - len);
 248         memcpy(sb->buf + pos, data, dlen);
 249         strbuf_setlen(sb, sb->len + dlen - len);
 250 }
 251
 252 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 253 {
 254         strbuf_splice(sb, pos, 0, data, len);
 255 }
 256
 257 void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
 258 {
 259         int len, len2;
 260         char save;
 261         va_list cp;
 262
 263         if (pos > sb->len)
 264                 die("`pos' is too far after the end of the buffer");
 265         va_copy(cp, ap);
 266         len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
 267         va_end(cp);
 268         if (len < 0)
 269                 BUG("your vsnprintf is broken (returned %d)", len);
 270         if (!len)
 271                 return; /* nothing to do */
 272         if (unsigned_add_overflows(sb->len, len))
 273                 die("you want to use way too much memory");
 274         strbuf_grow(sb, len);
 275         memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
 276         /* vsnprintf() will append a NUL, overwriting one of our characters */
 277         save = sb->buf[pos + len];
 278         len2 = vsnprintf(sb->buf + pos, len + 1, fmt, ap);
 279         sb->buf[pos + len] = save;
 280         if (len2 != len)
 281                 BUG("your vsnprintf is broken (returns inconsistent lengths)");
 282         strbuf_setlen(sb, sb->len + len);
 283 }
 284
 285 void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
 286 {
 287         va_list ap;
 288         va_start(ap, fmt);
 289         strbuf_vinsertf(sb, pos, fmt, ap);
 290         va_end(ap);
 291 }
 292
 293 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 294 {
 295         strbuf_splice(sb, pos, len, "", 0);
 296 }
 297
 298 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 299 {
 300         strbuf_grow(sb, len);
 301         memcpy(sb->buf + sb->len, data, len);
 302         strbuf_setlen(sb, sb->len + len);
 303 }
 304
 305 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 306 {
 307         strbuf_grow(sb, sb2->len);
 308         memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
 309         strbuf_setlen(sb, sb->len + sb2->len);
 310 }
 311
 312 const char *strbuf_join_argv(struct strbuf *buf,
 313                              int argc, const char **argv, char delim)
 314 {
 315         if (!argc)
 316                 return buf->buf;
 317
 318         strbuf_addstr(buf, *argv);
 319         while (--argc) {
 320                 strbuf_addch(buf, delim);
 321                 strbuf_addstr(buf, *(++argv));
 322         }
 323
 324         return buf->buf;
 325 }
 326
 327 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 328 {
 329         strbuf_grow(sb, n);
 330         memset(sb->buf + sb->len, c, n);
 331         strbuf_setlen(sb, sb->len + n);
 332 }
 333
 334 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 335 {
 336         va_list ap;
 337         va_start(ap, fmt);
 338         strbuf_vaddf(sb, fmt, ap);
 339         va_end(ap);
 340 }
 341
 342 static void add_lines(struct strbuf *out,
 343                         const char *prefix1,
 344                         const char *prefix2,
 345                         const char *buf, size_t size)
 346 {
 347         while (size) {
 348                 const char *prefix;
 349                 const char *next = memchr(buf, '\n', size);
 350                 next = next ? (next + 1) : (buf + size);
 351
 352                 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
 353                           ? prefix2 : prefix1);
 354                 strbuf_addstr(out, prefix);
 355                 strbuf_add(out, buf, next - buf);
 356                 size -= next - buf;
 357                 buf = next;
 358         }
 359         strbuf_complete_line(out);
 360 }
 361
 362 void strbuf_add_commented_lines(struct strbuf *out, const char *buf,
 363                                 size_t size, char comment_line_char)
 364 {
 365         static char prefix1[3];
 366         static char prefix2[2];
 367
 368         if (prefix1[0] != comment_line_char) {
 369                 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
 370                 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
 371         }
 372         add_lines(out, prefix1, prefix2, buf, size);
 373 }
 374
 375 void strbuf_commented_addf(struct strbuf *sb, char comment_line_char,
 376                            const char *fmt, ...)
 377 {
 378         va_list params;
 379         struct strbuf buf = STRBUF_INIT;
 380         int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
 381
 382         va_start(params, fmt);
 383         strbuf_vaddf(&buf, fmt, params);
 384         va_end(params);
 385
 386         strbuf_add_commented_lines(sb, buf.buf, buf.len, comment_line_char);
 387         if (incomplete_line)
 388                 sb->buf[--sb->len] = '\0';
 389
 390         strbuf_release(&buf);
 391 }
 392
 393 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 394 {
 395         int len;
 396         va_list cp;
 397
 398         if (!strbuf_avail(sb))
 399                 strbuf_grow(sb, 64);
 400         va_copy(cp, ap);
 401         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 402         va_end(cp);
 403         if (len < 0)
 404                 BUG("your vsnprintf is broken (returned %d)", len);
 405         if (len > strbuf_avail(sb)) {
 406                 strbuf_grow(sb, len);
 407                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 408                 if (len > strbuf_avail(sb))
 409                         BUG("your vsnprintf is broken (insatiable)");
 410         }
 411         strbuf_setlen(sb, sb->len + len);
 412 }
 413
 414 int strbuf_expand_step(struct strbuf *sb, const char **formatp)
 415 {
 416         const char *format = *formatp;
 417         const char *percent = strchrnul(format, '%');
 418
 419         strbuf_add(sb, format, percent - format);
 420         if (!*percent)
 421                 return 0;
 422         *formatp = percent + 1;
 423         return 1;
 424 }
 425
 426 size_t strbuf_expand_literal(struct strbuf *sb, const char *placeholder)
 427 {
 428         int ch;
 429
 430         switch (placeholder[0]) {
 431         case 'n':               /* newline */
 432                 strbuf_addch(sb, '\n');
 433                 return 1;
 434         case 'x':
 435                 /* %x00 == NUL, %x0a == LF, etc. */
 436                 ch = hex2chr(placeholder + 1);
 437                 if (ch < 0)
 438                         return 0;
 439                 strbuf_addch(sb, ch);
 440                 return 3;
 441         }
 442         return 0;
 443 }
 444
 445 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 446 {
 447         size_t i, len = src->len;
 448
 449         for (i = 0; i < len; i++) {
 450                 if (src->buf[i] == '%')
 451                         strbuf_addch(dst, '%');
 452                 strbuf_addch(dst, src->buf[i]);
 453         }
 454 }
 455
 456 #define URL_UNSAFE_CHARS " <>\"%{}|\\^`:?#[]@!$&'()*+,;="
 457
 458 void strbuf_add_percentencode(struct strbuf *dst, const char *src, int flags)
 459 {
 460         size_t i, len = strlen(src);
 461
 462         for (i = 0; i < len; i++) {
 463                 unsigned char ch = src[i];
 464                 if (ch <= 0x1F || ch >= 0x7F ||
 465                     (ch == '/' && (flags & STRBUF_ENCODE_SLASH)) ||
 466                     strchr(URL_UNSAFE_CHARS, ch))
 467                         strbuf_addf(dst, "%%%02X", (unsigned char)ch);
 468                 else
 469                         strbuf_addch(dst, ch);
 470         }
 471 }
 472
 473 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 474 {
 475         size_t res;
 476         size_t oldalloc = sb->alloc;
 477
 478         strbuf_grow(sb, size);
 479         res = fread(sb->buf + sb->len, 1, size, f);
 480         if (res > 0)
 481                 strbuf_setlen(sb, sb->len + res);
 482         else if (oldalloc == 0)
 483                 strbuf_release(sb);
 484         return res;
 485 }
 486
 487 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 488 {
 489         size_t oldlen = sb->len;
 490         size_t oldalloc = sb->alloc;
 491
 492         strbuf_grow(sb, hint ? hint : 8192);
 493         for (;;) {
 494                 ssize_t want = sb->alloc - sb->len - 1;
 495                 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
 496
 497                 if (got < 0) {
 498                         if (oldalloc == 0)
 499                                 strbuf_release(sb);
 500                         else
 501                                 strbuf_setlen(sb, oldlen);
 502                         return -1;
 503                 }
 504                 sb->len += got;
 505                 if (got < want)
 506                         break;
 507                 strbuf_grow(sb, 8192);
 508         }
 509
 510         sb->buf[sb->len] = '\0';
 511         return sb->len - oldlen;
 512 }
 513
 514 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 515 {
 516         size_t oldalloc = sb->alloc;
 517         ssize_t cnt;
 518
 519         strbuf_grow(sb, hint ? hint : 8192);
 520         cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 521         if (cnt > 0)
 522                 strbuf_setlen(sb, sb->len + cnt);
 523         else if (oldalloc == 0)
 524                 strbuf_release(sb);
 525         return cnt;
 526 }
 527
 528 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 529 {
 530         return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 531 }
 532
 533 #define STRBUF_MAXLINK (2*PATH_MAX)
 534
 535 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 536 {
 537         size_t oldalloc = sb->alloc;
 538
 539         if (hint < 32)
 540                 hint = 32;
 541
 542         while (hint < STRBUF_MAXLINK) {
 543                 ssize_t len;
 544
 545                 strbuf_grow(sb, hint);
 546                 len = readlink(path, sb->buf, hint);
 547                 if (len < 0) {
 548                         if (errno != ERANGE)
 549                                 break;
 550                 } else if (len < hint) {
 551                         strbuf_setlen(sb, len);
 552                         return 0;
 553                 }
 554
 555                 /* .. the buffer was too small - try again */
 556                 hint *= 2;
 557         }
 558         if (oldalloc == 0)
 559                 strbuf_release(sb);
 560         return -1;
 561 }
 562
 563 int strbuf_getcwd(struct strbuf *sb)
 564 {
 565         size_t oldalloc = sb->alloc;
 566         size_t guessed_len = 128;
 567
 568         for (;; guessed_len *= 2) {
 569                 strbuf_grow(sb, guessed_len);
 570                 if (getcwd(sb->buf, sb->alloc)) {
 571                         strbuf_setlen(sb, strlen(sb->buf));
 572                         return 0;
 573                 }
 574
 575                 /*
 576                  * If getcwd(3) is implemented as a syscall that falls
 577                  * back to a regular lookup using readdir(3) etc. then
 578                  * we may be able to avoid EACCES by providing enough
 579                  * space to the syscall as it's not necessarily bound
 580                  * to the same restrictions as the fallback.
 581                  */
 582                 if (errno == EACCES && guessed_len < PATH_MAX)
 583                         continue;
 584
 585                 if (errno != ERANGE)
 586                         break;
 587         }
 588         if (oldalloc == 0)
 589                 strbuf_release(sb);
 590         else
 591                 strbuf_reset(sb);
 592         return -1;
 593 }
 594
 595 #ifdef HAVE_GETDELIM
 596 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 597 {
 598         ssize_t r;
 599
 600         if (feof(fp))
 601                 return EOF;
 602
 603         strbuf_reset(sb);
 604
 605         /* Translate slopbuf to NULL, as we cannot call realloc on it */
 606         if (!sb->alloc)
 607                 sb->buf = NULL;
 608         errno = 0;
 609         r = getdelim(&sb->buf, &sb->alloc, term, fp);
 610
 611         if (r > 0) {
 612                 sb->len = r;
 613                 return 0;
 614         }
 615         assert(r == -1);
 616
 617         /*
 618          * Normally we would have called xrealloc, which will try to free
 619          * memory and recover. But we have no way to tell getdelim() to do so.
 620          * Worse, we cannot try to recover ENOMEM ourselves, because we have
 621          * no idea how many bytes were read by getdelim.
 622          *
 623          * Dying here is reasonable. It mirrors what xrealloc would do on
 624          * catastrophic memory failure. We skip the opportunity to free pack
 625          * memory and retry, but that's unlikely to help for a malloc small
 626          * enough to hold a single line of input, anyway.
 627          */
 628         if (errno == ENOMEM)
 629                 die("Out of memory, getdelim failed");
 630
 631         /*
 632          * Restore strbuf invariants; if getdelim left us with a NULL pointer,
 633          * we can just re-init, but otherwise we should make sure that our
 634          * length is empty, and that the result is NUL-terminated.
 635          */
 636         if (!sb->buf)
 637                 strbuf_init(sb, 0);
 638         else
 639                 strbuf_reset(sb);
 640         return EOF;
 641 }
 642 #else
 643 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 644 {
 645         int ch;
 646
 647         if (feof(fp))
 648                 return EOF;
 649
 650         strbuf_reset(sb);
 651         flockfile(fp);
 652         while ((ch = getc_unlocked(fp)) != EOF) {
 653                 if (!strbuf_avail(sb))
 654                         strbuf_grow(sb, 1);
 655                 sb->buf[sb->len++] = ch;
 656                 if (ch == term)
 657                         break;
 658         }
 659         funlockfile(fp);
 660         if (ch == EOF && sb->len == 0)
 661                 return EOF;
 662
 663         sb->buf[sb->len] = '\0';
 664         return 0;
 665 }
 666 #endif
 667
 668 int strbuf_appendwholeline(struct strbuf *sb, FILE *fp, int term)
 669 {
 670         struct strbuf line = STRBUF_INIT;
 671         if (strbuf_getwholeline(&line, fp, term))
 672                 return EOF;
 673         strbuf_addbuf(sb, &line);
 674         strbuf_release(&line);
 675         return 0;
 676 }
 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_getdelim_strip_crlf(struct strbuf *sb, FILE *fp, int term)
 688 {
 689         if (strbuf_getwholeline(sb, fp, term))
 690                 return EOF;
 691         if (term == '\n' && 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(struct strbuf *sb, FILE *fp)
 700 {
 701         return strbuf_getdelim_strip_crlf(sb, fp, '\n');
 702 }
 703
 704 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 705 {
 706         return strbuf_getdelim(sb, fp, '\n');
 707 }
 708
 709 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 710 {
 711         return strbuf_getdelim(sb, fp, '\0');
 712 }
 713
 714 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 715 {
 716         strbuf_reset(sb);
 717
 718         while (1) {
 719                 char ch;
 720                 ssize_t len = xread(fd, &ch, 1);
 721                 if (len <= 0)
 722                         return EOF;
 723                 strbuf_addch(sb, ch);
 724                 if (ch == term)
 725                         break;
 726         }
 727         return 0;
 728 }
 729
 730 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 731 {
 732         int fd;
 733         ssize_t len;
 734         int saved_errno;
 735
 736         fd = open(path, O_RDONLY);
 737         if (fd < 0)
 738                 return -1;
 739         len = strbuf_read(sb, fd, hint);
 740         saved_errno = errno;
 741         close(fd);
 742         if (len < 0) {
 743                 errno = saved_errno;
 744                 return -1;
 745         }
 746
 747         return len;
 748 }
 749
 750 void strbuf_add_lines(struct strbuf *out, const char *prefix,
 751                       const char *buf, size_t size)
 752 {
 753         add_lines(out, prefix, NULL, buf, size);
 754 }
 755
 756 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
 757 {
 758         while (*s) {
 759                 size_t len = strcspn(s, "\"<>&");
 760                 strbuf_add(buf, s, len);
 761                 s += len;
 762                 switch (*s) {
 763                 case '"':
 764                         strbuf_addstr(buf, "&quot;");
 765                         break;
 766                 case '<':
 767                         strbuf_addstr(buf, "&lt;");
 768                         break;
 769                 case '>':
 770                         strbuf_addstr(buf, "&gt;");
 771                         break;
 772                 case '&':
 773                         strbuf_addstr(buf, "&amp;");
 774                         break;
 775                 case 0:
 776                         return;
 777                 }
 778                 s++;
 779         }
 780 }
 781
 782 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 783                                  char_predicate allow_unencoded_fn)
 784 {
 785         strbuf_grow(sb, len);
 786         while (len--) {
 787                 char ch = *s++;
 788                 if (allow_unencoded_fn(ch))
 789                         strbuf_addch(sb, ch);
 790                 else
 791                         strbuf_addf(sb, "%%%02x", (unsigned char)ch);
 792         }
 793 }
 794
 795 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 796                              char_predicate allow_unencoded_fn)
 797 {
 798         strbuf_add_urlencode(sb, s, strlen(s), allow_unencoded_fn);
 799 }
 800
 801 static void strbuf_humanise(struct strbuf *buf, off_t bytes,
 802                                  int humanise_rate)
 803 {
 804         if (bytes > 1 << 30) {
 805                 strbuf_addf(buf,
 806                                 humanise_rate == 0 ?
 807                                         /* TRANSLATORS: IEC 80000-13:2008 gibibyte */
 808                                         _("%u.%2.2u GiB") :
 809                                         /* TRANSLATORS: IEC 80000-13:2008 gibibyte/second */
 810                                         _("%u.%2.2u GiB/s"),
 811                             (unsigned)(bytes >> 30),
 812                             (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
 813         } else if (bytes > 1 << 20) {
 814                 unsigned x = bytes + 5243;  /* for rounding */
 815                 strbuf_addf(buf,
 816                                 humanise_rate == 0 ?
 817                                         /* TRANSLATORS: IEC 80000-13:2008 mebibyte */
 818                                         _("%u.%2.2u MiB") :
 819                                         /* TRANSLATORS: IEC 80000-13:2008 mebibyte/second */
 820                                         _("%u.%2.2u MiB/s"),
 821                             x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 822         } else if (bytes > 1 << 10) {
 823                 unsigned x = bytes + 5;  /* for rounding */
 824                 strbuf_addf(buf,
 825                                 humanise_rate == 0 ?
 826                                         /* TRANSLATORS: IEC 80000-13:2008 kibibyte */
 827                                         _("%u.%2.2u KiB") :
 828                                         /* TRANSLATORS: IEC 80000-13:2008 kibibyte/second */
 829                                         _("%u.%2.2u KiB/s"),
 830                             x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 831         } else {
 832                 strbuf_addf(buf,
 833                                 humanise_rate == 0 ?
 834                                         /* TRANSLATORS: IEC 80000-13:2008 byte */
 835                                         Q_("%u byte", "%u bytes", bytes) :
 836                                         /* TRANSLATORS: IEC 80000-13:2008 byte/second */
 837                                         Q_("%u byte/s", "%u bytes/s", bytes),
 838                                 (unsigned)bytes);
 839         }
 840 }
 841
 842 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
 843 {
 844         strbuf_humanise(buf, bytes, 0);
 845 }
 846
 847 void strbuf_humanise_rate(struct strbuf *buf, off_t bytes)
 848 {
 849         strbuf_humanise(buf, bytes, 1);
 850 }
 851
 852 int printf_ln(const char *fmt, ...)
 853 {
 854         int ret;
 855         va_list ap;
 856         va_start(ap, fmt);
 857         ret = vprintf(fmt, ap);
 858         va_end(ap);
 859         if (ret < 0 || putchar('\n') == EOF)
 860                 return -1;
 861         return ret + 1;
 862 }
 863
 864 int fprintf_ln(FILE *fp, const char *fmt, ...)
 865 {
 866         int ret;
 867         va_list ap;
 868         va_start(ap, fmt);
 869         ret = vfprintf(fp, fmt, ap);
 870         va_end(ap);
 871         if (ret < 0 || putc('\n', fp) == EOF)
 872                 return -1;
 873         return ret + 1;
 874 }
 875
 876 char *xstrdup_tolower(const char *string)
 877 {
 878         char *result;
 879         size_t len, i;
 880
 881         len = strlen(string);
 882         result = xmallocz(len);
 883         for (i = 0; i < len; i++)
 884                 result[i] = tolower(string[i]);
 885         return result;
 886 }
 887
 888 char *xstrdup_toupper(const char *string)
 889 {
 890         char *result;
 891         size_t len, i;
 892
 893         len = strlen(string);
 894         result = xmallocz(len);
 895         for (i = 0; i < len; i++)
 896                 result[i] = toupper(string[i]);
 897         return result;
 898 }
 899
 900 char *xstrvfmt(const char *fmt, va_list ap)
 901 {
 902         struct strbuf buf = STRBUF_INIT;
 903         strbuf_vaddf(&buf, fmt, ap);
 904         return strbuf_detach(&buf, NULL);
 905 }
 906
 907 char *xstrfmt(const char *fmt, ...)
 908 {
 909         va_list ap;
 910         char *ret;
 911
 912         va_start(ap, fmt);
 913         ret = xstrvfmt(fmt, ap);
 914         va_end(ap);
 915
 916         return ret;
 917 }
 918
 919 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 920                      int tz_offset, int suppress_tz_name)
 921 {
 922         struct strbuf munged_fmt = STRBUF_INIT;
 923         size_t hint = 128;
 924         size_t len;
 925
 926         if (!*fmt)
 927                 return;
 928
 929         /*
 930          * There is no portable way to pass timezone information to
 931          * strftime, so we handle %z and %Z here. Likewise '%s', because
 932          * going back to an epoch time requires knowing the zone.
 933          *
 934          * Note that tz_offset is in the "[-+]HHMM" decimal form; this is what
 935          * we want for %z, but the computation for %s has to convert to number
 936          * of seconds.
 937          */
 938         while (strbuf_expand_step(&munged_fmt, &fmt)) {
 939                 if (skip_prefix(fmt, "%", &fmt))
 940                         strbuf_addstr(&munged_fmt, "%%");
 941                 else if (skip_prefix(fmt, "s", &fmt))
 942                         strbuf_addf(&munged_fmt, "%"PRItime,
 943                                     (timestamp_t)tm_to_time_t(tm) -
 944                                     3600 * (tz_offset / 100) -
 945                                     60 * (tz_offset % 100));
 946                 else if (skip_prefix(fmt, "z", &fmt))
 947                         strbuf_addf(&munged_fmt, "%+05d", tz_offset);
 948                 else if (suppress_tz_name && skip_prefix(fmt, "Z", &fmt))
 949                         ; /* nothing */
 950                 else
 951                         strbuf_addch(&munged_fmt, '%');
 952         }
 953         fmt = munged_fmt.buf;
 954
 955         strbuf_grow(sb, hint);
 956         len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
 957
 958         if (!len) {
 959                 /*
 960                  * strftime reports "0" if it could not fit the result in the buffer.
 961                  * Unfortunately, it also reports "0" if the requested time string
 962                  * takes 0 bytes. So our strategy is to munge the format so that the
 963                  * output contains at least one character, and then drop the extra
 964                  * character before returning.
 965                  */
 966                 strbuf_addch(&munged_fmt, ' ');
 967                 while (!len) {
 968                         hint *= 2;
 969                         strbuf_grow(sb, hint);
 970                         len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
 971                                        munged_fmt.buf, tm);
 972                 }
 973                 len--; /* drop munged space */
 974         }
 975         strbuf_release(&munged_fmt);
 976         strbuf_setlen(sb, sb->len + len);
 977 }
 978
 979 /*
 980  * Returns the length of a line, without trailing spaces.
 981  *
 982  * If the line ends with newline, it will be removed too.
 983  */
 984 static size_t cleanup(char *line, size_t len)
 985 {
 986         while (len) {
 987                 unsigned char c = line[len - 1];
 988                 if (!isspace(c))
 989                         break;
 990                 len--;
 991         }
 992
 993         return len;
 994 }
 995
 996 /*
 997  * Remove empty lines from the beginning and end
 998  * and also trailing spaces from every line.
 999  *
1000  * Turn multiple consecutive empty lines between paragraphs
1001  * into just one empty line.
1002  *
1003  * If the input has only empty lines and spaces,
1004  * no output will be produced.
1005  *
1006  * If last line does not have a newline at the end, one is added.
1007  *
1008  * Pass a non-NUL comment_line_char to skip every line starting
1009  * with it.
1010  */
1011 void strbuf_stripspace(struct strbuf *sb, char comment_line_char)
1012 {
1013         size_t empties = 0;
1014         size_t i, j, len, newlen;
1015         char *eol;
1016
1017         /* We may have to add a newline. */
1018         strbuf_grow(sb, 1);
1019
1020         for (i = j = 0; i < sb->len; i += len, j += newlen) {
1021                 eol = memchr(sb->buf + i, '\n', sb->len - i);
1022                 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
1023
1024                 if (comment_line_char && len &&
1025                     sb->buf[i] == comment_line_char) {
1026                         newlen = 0;
1027                         continue;
1028                 }
1029                 newlen = cleanup(sb->buf + i, len);
1030
1031                 /* Not just an empty line? */
1032                 if (newlen) {
1033                         if (empties > 0 && j > 0)
1034                                 sb->buf[j++] = '\n';
1035                         empties = 0;
1036                         memmove(sb->buf + j, sb->buf + i, newlen);
1037                         sb->buf[newlen + j++] = '\n';
1038                 } else {
1039                         empties++;
1040                 }
1041         }
1042
1043         strbuf_setlen(sb, j);
1044 }
1045
1046 void strbuf_strip_file_from_path(struct strbuf *sb)
1047 {
1048         char *path_sep = find_last_dir_sep(sb->buf);
1049         strbuf_setlen(sb, path_sep ? path_sep - sb->buf + 1 : 0);
1050 }