strbuf.c

   1 #include "cache.h"
   2 #include "abspath.h"
   3 #include "alloc.h"
   4 #include "environment.h"
   5 #include "gettext.h"
   6 #include "hex.h"
   7 #include "object-name.h"
   8 #include "refs.h"
   9 #include "string-list.h"
  10 #include "utf8.h"
  11 #include "date.h"
  12 #include "wrapper.h"
  13
  14 int starts_with(const char *str, const char *prefix)
  15 {
  16         for (; ; str++, prefix++)
  17                 if (!*prefix)
  18                         return 1;
  19                 else if (*str != *prefix)
  20                         return 0;
  21 }
  22
  23 int istarts_with(const char *str, const char *prefix)
  24 {
  25         for (; ; str++, prefix++)
  26                 if (!*prefix)
  27                         return 1;
  28                 else if (tolower(*str) != tolower(*prefix))
  29                         return 0;
  30 }
  31
  32 int skip_to_optional_arg_default(const char *str, const char *prefix,
  33                                  const char **arg, const char *def)
  34 {
  35         const char *p;
  36
  37         if (!skip_prefix(str, prefix, &p))
  38                 return 0;
  39
  40         if (!*p) {
  41                 if (arg)
  42                         *arg = def;
  43                 return 1;
  44         }
  45
  46         if (*p != '=')
  47                 return 0;
  48
  49         if (arg)
  50                 *arg = p + 1;
  51         return 1;
  52 }
  53
  54 /*
  55  * Used as the default ->buf value, so that people can always assume
  56  * buf is non NULL and ->buf is NUL terminated even for a freshly
  57  * initialized strbuf.
  58  */
  59 char strbuf_slopbuf[1];
  60
  61 void strbuf_init(struct strbuf *sb, size_t hint)
  62 {
  63         struct strbuf blank = STRBUF_INIT;
  64         memcpy(sb, &blank, sizeof(*sb));
  65         if (hint)
  66                 strbuf_grow(sb, hint);
  67 }
  68
  69 void strbuf_release(struct strbuf *sb)
  70 {
  71         if (sb->alloc) {
  72                 free(sb->buf);
  73                 strbuf_init(sb, 0);
  74         }
  75 }
  76
  77 char *strbuf_detach(struct strbuf *sb, size_t *sz)
  78 {
  79         char *res;
  80         strbuf_grow(sb, 0);
  81         res = sb->buf;
  82         if (sz)
  83                 *sz = sb->len;
  84         strbuf_init(sb, 0);
  85         return res;
  86 }
  87
  88 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
  89 {
  90         strbuf_release(sb);
  91         sb->buf   = buf;
  92         sb->len   = len;
  93         sb->alloc = alloc;
  94         strbuf_grow(sb, 0);
  95         sb->buf[sb->len] = '\0';
  96 }
  97
  98 void strbuf_grow(struct strbuf *sb, size_t extra)
  99 {
 100         int new_buf = !sb->alloc;
 101         if (unsigned_add_overflows(extra, 1) ||
 102             unsigned_add_overflows(sb->len, extra + 1))
 103                 die("you want to use way too much memory");
 104         if (new_buf)
 105                 sb->buf = NULL;
 106         ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
 107         if (new_buf)
 108                 sb->buf[0] = '\0';
 109 }
 110
 111 void strbuf_trim(struct strbuf *sb)
 112 {
 113         strbuf_rtrim(sb);
 114         strbuf_ltrim(sb);
 115 }
 116
 117 void strbuf_rtrim(struct strbuf *sb)
 118 {
 119         while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
 120                 sb->len--;
 121         sb->buf[sb->len] = '\0';
 122 }
 123
 124 void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
 125 {
 126         while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
 127                 sb->len--;
 128         sb->buf[sb->len] = '\0';
 129 }
 130
 131 void strbuf_trim_trailing_newline(struct strbuf *sb)
 132 {
 133         if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
 134                 if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
 135                         --sb->len;
 136                 sb->buf[sb->len] = '\0';
 137         }
 138 }
 139
 140 void strbuf_ltrim(struct strbuf *sb)
 141 {
 142         char *b = sb->buf;
 143         while (sb->len > 0 && isspace(*b)) {
 144                 b++;
 145                 sb->len--;
 146         }
 147         memmove(sb->buf, b, sb->len);
 148         sb->buf[sb->len] = '\0';
 149 }
 150
 151 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
 152 {
 153         char *out;
 154         size_t len;
 155
 156         if (same_encoding(from, to))
 157                 return 0;
 158
 159         out = reencode_string_len(sb->buf, sb->len, to, from, &len);
 160         if (!out)
 161                 return -1;
 162
 163         strbuf_attach(sb, out, len, len);
 164         return 0;
 165 }
 166
 167 void strbuf_tolower(struct strbuf *sb)
 168 {
 169         char *p = sb->buf, *end = sb->buf + sb->len;
 170         for (; p < end; p++)
 171                 *p = tolower(*p);
 172 }
 173
 174 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
 175                                  int terminator, int max)
 176 {
 177         struct strbuf **ret = NULL;
 178         size_t nr = 0, alloc = 0;
 179         struct strbuf *t;
 180
 181         while (slen) {
 182                 int len = slen;
 183                 if (max <= 0 || nr + 1 < max) {
 184                         const char *end = memchr(str, terminator, slen);
 185                         if (end)
 186                                 len = end - str + 1;
 187                 }
 188                 t = xmalloc(sizeof(struct strbuf));
 189                 strbuf_init(t, len);
 190                 strbuf_add(t, str, len);
 191                 ALLOC_GROW(ret, nr + 2, alloc);
 192                 ret[nr++] = t;
 193                 str += len;
 194                 slen -= len;
 195         }
 196         ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
 197         ret[nr] = NULL;
 198         return ret;
 199 }
 200
 201 void strbuf_add_separated_string_list(struct strbuf *str,
 202                                       const char *sep,
 203                                       struct string_list *slist)
 204 {
 205         struct string_list_item *item;
 206         int sep_needed = 0;
 207
 208         for_each_string_list_item(item, slist) {
 209                 if (sep_needed)
 210                         strbuf_addstr(str, sep);
 211                 strbuf_addstr(str, item->string);
 212                 sep_needed = 1;
 213         }
 214 }
 215
 216 void strbuf_list_free(struct strbuf **sbs)
 217 {
 218         struct strbuf **s = sbs;
 219
 220         if (!s)
 221                 return;
 222         while (*s) {
 223                 strbuf_release(*s);
 224                 free(*s++);
 225         }
 226         free(sbs);
 227 }
 228
 229 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
 230 {
 231         size_t len = a->len < b->len ? a->len: b->len;
 232         int cmp = memcmp(a->buf, b->buf, len);
 233         if (cmp)
 234                 return cmp;
 235         return a->len < b->len ? -1: a->len != b->len;
 236 }
 237
 238 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
 239                                    const void *data, size_t dlen)
 240 {
 241         if (unsigned_add_overflows(pos, len))
 242                 die("you want to use way too much memory");
 243         if (pos > sb->len)
 244                 die("`pos' is too far after the end of the buffer");
 245         if (pos + len > sb->len)
 246                 die("`pos + len' is too far after the end of the buffer");
 247
 248         if (dlen >= len)
 249                 strbuf_grow(sb, dlen - len);
 250         memmove(sb->buf + pos + dlen,
 251                         sb->buf + pos + len,
 252                         sb->len - pos - len);
 253         memcpy(sb->buf + pos, data, dlen);
 254         strbuf_setlen(sb, sb->len + dlen - len);
 255 }
 256
 257 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
 258 {
 259         strbuf_splice(sb, pos, 0, data, len);
 260 }
 261
 262 void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
 263 {
 264         int len, len2;
 265         char save;
 266         va_list cp;
 267
 268         if (pos > sb->len)
 269                 die("`pos' is too far after the end of the buffer");
 270         va_copy(cp, ap);
 271         len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
 272         va_end(cp);
 273         if (len < 0)
 274                 BUG("your vsnprintf is broken (returned %d)", len);
 275         if (!len)
 276                 return; /* nothing to do */
 277         if (unsigned_add_overflows(sb->len, len))
 278                 die("you want to use way too much memory");
 279         strbuf_grow(sb, len);
 280         memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
 281         /* vsnprintf() will append a NUL, overwriting one of our characters */
 282         save = sb->buf[pos + len];
 283         len2 = vsnprintf(sb->buf + pos, len + 1, fmt, ap);
 284         sb->buf[pos + len] = save;
 285         if (len2 != len)
 286                 BUG("your vsnprintf is broken (returns inconsistent lengths)");
 287         strbuf_setlen(sb, sb->len + len);
 288 }
 289
 290 void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
 291 {
 292         va_list ap;
 293         va_start(ap, fmt);
 294         strbuf_vinsertf(sb, pos, fmt, ap);
 295         va_end(ap);
 296 }
 297
 298 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 299 {
 300         strbuf_splice(sb, pos, len, "", 0);
 301 }
 302
 303 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 304 {
 305         strbuf_grow(sb, len);
 306         memcpy(sb->buf + sb->len, data, len);
 307         strbuf_setlen(sb, sb->len + len);
 308 }
 309
 310 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 311 {
 312         strbuf_grow(sb, sb2->len);
 313         memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
 314         strbuf_setlen(sb, sb->len + sb2->len);
 315 }
 316
 317 const char *strbuf_join_argv(struct strbuf *buf,
 318                              int argc, const char **argv, char delim)
 319 {
 320         if (!argc)
 321                 return buf->buf;
 322
 323         strbuf_addstr(buf, *argv);
 324         while (--argc) {
 325                 strbuf_addch(buf, delim);
 326                 strbuf_addstr(buf, *(++argv));
 327         }
 328
 329         return buf->buf;
 330 }
 331
 332 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 333 {
 334         strbuf_grow(sb, n);
 335         memset(sb->buf + sb->len, c, n);
 336         strbuf_setlen(sb, sb->len + n);
 337 }
 338
 339 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 340 {
 341         va_list ap;
 342         va_start(ap, fmt);
 343         strbuf_vaddf(sb, fmt, ap);
 344         va_end(ap);
 345 }
 346
 347 static void add_lines(struct strbuf *out,
 348                         const char *prefix1,
 349                         const char *prefix2,
 350                         const char *buf, size_t size)
 351 {
 352         while (size) {
 353                 const char *prefix;
 354                 const char *next = memchr(buf, '\n', size);
 355                 next = next ? (next + 1) : (buf + size);
 356
 357                 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
 358                           ? prefix2 : prefix1);
 359                 strbuf_addstr(out, prefix);
 360                 strbuf_add(out, buf, next - buf);
 361                 size -= next - buf;
 362                 buf = next;
 363         }
 364         strbuf_complete_line(out);
 365 }
 366
 367 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
 368 {
 369         static char prefix1[3];
 370         static char prefix2[2];
 371
 372         if (prefix1[0] != comment_line_char) {
 373                 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
 374                 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
 375         }
 376         add_lines(out, prefix1, prefix2, buf, size);
 377 }
 378
 379 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
 380 {
 381         va_list params;
 382         struct strbuf buf = STRBUF_INIT;
 383         int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
 384
 385         va_start(params, fmt);
 386         strbuf_vaddf(&buf, fmt, params);
 387         va_end(params);
 388
 389         strbuf_add_commented_lines(sb, buf.buf, buf.len);
 390         if (incomplete_line)
 391                 sb->buf[--sb->len] = '\0';
 392
 393         strbuf_release(&buf);
 394 }
 395
 396 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 397 {
 398         int len;
 399         va_list cp;
 400
 401         if (!strbuf_avail(sb))
 402                 strbuf_grow(sb, 64);
 403         va_copy(cp, ap);
 404         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 405         va_end(cp);
 406         if (len < 0)
 407                 BUG("your vsnprintf is broken (returned %d)", len);
 408         if (len > strbuf_avail(sb)) {
 409                 strbuf_grow(sb, len);
 410                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 411                 if (len > strbuf_avail(sb))
 412                         BUG("your vsnprintf is broken (insatiable)");
 413         }
 414         strbuf_setlen(sb, sb->len + len);
 415 }
 416
 417 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 418                    void *context)
 419 {
 420         for (;;) {
 421                 const char *percent;
 422                 size_t consumed;
 423
 424                 percent = strchrnul(format, '%');
 425                 strbuf_add(sb, format, percent - format);
 426                 if (!*percent)
 427                         break;
 428                 format = percent + 1;
 429
 430                 if (*format == '%') {
 431                         strbuf_addch(sb, '%');
 432                         format++;
 433                         continue;
 434                 }
 435
 436                 consumed = fn(sb, format, context);
 437                 if (consumed)
 438                         format += consumed;
 439                 else
 440                         strbuf_addch(sb, '%');
 441         }
 442 }
 443
 444 size_t strbuf_expand_literal_cb(struct strbuf *sb,
 445                                 const char *placeholder,
 446                                 void *context UNUSED)
 447 {
 448         int ch;
 449
 450         switch (placeholder[0]) {
 451         case 'n':               /* newline */
 452                 strbuf_addch(sb, '\n');
 453                 return 1;
 454         case 'x':
 455                 /* %x00 == NUL, %x0a == LF, etc. */
 456                 ch = hex2chr(placeholder + 1);
 457                 if (ch < 0)
 458                         return 0;
 459                 strbuf_addch(sb, ch);
 460                 return 3;
 461         }
 462         return 0;
 463 }
 464
 465 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 466                 void *context)
 467 {
 468         struct strbuf_expand_dict_entry *e = context;
 469         size_t len;
 470
 471         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 472                 if (!strncmp(placeholder, e->placeholder, len)) {
 473                         if (e->value)
 474                                 strbuf_addstr(sb, e->value);
 475                         return len;
 476                 }
 477         }
 478         return 0;
 479 }
 480
 481 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 482 {
 483         size_t i, len = src->len;
 484
 485         for (i = 0; i < len; i++) {
 486                 if (src->buf[i] == '%')
 487                         strbuf_addch(dst, '%');
 488                 strbuf_addch(dst, src->buf[i]);
 489         }
 490 }
 491
 492 #define URL_UNSAFE_CHARS " <>\"%{}|\\^`:?#[]@!$&'()*+,;="
 493
 494 void strbuf_add_percentencode(struct strbuf *dst, const char *src, int flags)
 495 {
 496         size_t i, len = strlen(src);
 497
 498         for (i = 0; i < len; i++) {
 499                 unsigned char ch = src[i];
 500                 if (ch <= 0x1F || ch >= 0x7F ||
 501                     (ch == '/' && (flags & STRBUF_ENCODE_SLASH)) ||
 502                     strchr(URL_UNSAFE_CHARS, ch))
 503                         strbuf_addf(dst, "%%%02X", (unsigned char)ch);
 504                 else
 505                         strbuf_addch(dst, ch);
 506         }
 507 }
 508
 509 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 510 {
 511         size_t res;
 512         size_t oldalloc = sb->alloc;
 513
 514         strbuf_grow(sb, size);
 515         res = fread(sb->buf + sb->len, 1, size, f);
 516         if (res > 0)
 517                 strbuf_setlen(sb, sb->len + res);
 518         else if (oldalloc == 0)
 519                 strbuf_release(sb);
 520         return res;
 521 }
 522
 523 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 524 {
 525         size_t oldlen = sb->len;
 526         size_t oldalloc = sb->alloc;
 527
 528         strbuf_grow(sb, hint ? hint : 8192);
 529         for (;;) {
 530                 ssize_t want = sb->alloc - sb->len - 1;
 531                 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
 532
 533                 if (got < 0) {
 534                         if (oldalloc == 0)
 535                                 strbuf_release(sb);
 536                         else
 537                                 strbuf_setlen(sb, oldlen);
 538                         return -1;
 539                 }
 540                 sb->len += got;
 541                 if (got < want)
 542                         break;
 543                 strbuf_grow(sb, 8192);
 544         }
 545
 546         sb->buf[sb->len] = '\0';
 547         return sb->len - oldlen;
 548 }
 549
 550 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 551 {
 552         size_t oldalloc = sb->alloc;
 553         ssize_t cnt;
 554
 555         strbuf_grow(sb, hint ? hint : 8192);
 556         cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 557         if (cnt > 0)
 558                 strbuf_setlen(sb, sb->len + cnt);
 559         else if (oldalloc == 0)
 560                 strbuf_release(sb);
 561         return cnt;
 562 }
 563
 564 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 565 {
 566         return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 567 }
 568
 569 #define STRBUF_MAXLINK (2*PATH_MAX)
 570
 571 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 572 {
 573         size_t oldalloc = sb->alloc;
 574
 575         if (hint < 32)
 576                 hint = 32;
 577
 578         while (hint < STRBUF_MAXLINK) {
 579                 ssize_t len;
 580
 581                 strbuf_grow(sb, hint);
 582                 len = readlink(path, sb->buf, hint);
 583                 if (len < 0) {
 584                         if (errno != ERANGE)
 585                                 break;
 586                 } else if (len < hint) {
 587                         strbuf_setlen(sb, len);
 588                         return 0;
 589                 }
 590
 591                 /* .. the buffer was too small - try again */
 592                 hint *= 2;
 593         }
 594         if (oldalloc == 0)
 595                 strbuf_release(sb);
 596         return -1;
 597 }
 598
 599 int strbuf_getcwd(struct strbuf *sb)
 600 {
 601         size_t oldalloc = sb->alloc;
 602         size_t guessed_len = 128;
 603
 604         for (;; guessed_len *= 2) {
 605                 strbuf_grow(sb, guessed_len);
 606                 if (getcwd(sb->buf, sb->alloc)) {
 607                         strbuf_setlen(sb, strlen(sb->buf));
 608                         return 0;
 609                 }
 610
 611                 /*
 612                  * If getcwd(3) is implemented as a syscall that falls
 613                  * back to a regular lookup using readdir(3) etc. then
 614                  * we may be able to avoid EACCES by providing enough
 615                  * space to the syscall as it's not necessarily bound
 616                  * to the same restrictions as the fallback.
 617                  */
 618                 if (errno == EACCES && guessed_len < PATH_MAX)
 619                         continue;
 620
 621                 if (errno != ERANGE)
 622                         break;
 623         }
 624         if (oldalloc == 0)
 625                 strbuf_release(sb);
 626         else
 627                 strbuf_reset(sb);
 628         return -1;
 629 }
 630
 631 #ifdef HAVE_GETDELIM
 632 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 633 {
 634         ssize_t r;
 635
 636         if (feof(fp))
 637                 return EOF;
 638
 639         strbuf_reset(sb);
 640
 641         /* Translate slopbuf to NULL, as we cannot call realloc on it */
 642         if (!sb->alloc)
 643                 sb->buf = NULL;
 644         errno = 0;
 645         r = getdelim(&sb->buf, &sb->alloc, term, fp);
 646
 647         if (r > 0) {
 648                 sb->len = r;
 649                 return 0;
 650         }
 651         assert(r == -1);
 652
 653         /*
 654          * Normally we would have called xrealloc, which will try to free
 655          * memory and recover. But we have no way to tell getdelim() to do so.
 656          * Worse, we cannot try to recover ENOMEM ourselves, because we have
 657          * no idea how many bytes were read by getdelim.
 658          *
 659          * Dying here is reasonable. It mirrors what xrealloc would do on
 660          * catastrophic memory failure. We skip the opportunity to free pack
 661          * memory and retry, but that's unlikely to help for a malloc small
 662          * enough to hold a single line of input, anyway.
 663          */
 664         if (errno == ENOMEM)
 665                 die("Out of memory, getdelim failed");
 666
 667         /*
 668          * Restore strbuf invariants; if getdelim left us with a NULL pointer,
 669          * we can just re-init, but otherwise we should make sure that our
 670          * length is empty, and that the result is NUL-terminated.
 671          */
 672         if (!sb->buf)
 673                 strbuf_init(sb, 0);
 674         else
 675                 strbuf_reset(sb);
 676         return EOF;
 677 }
 678 #else
 679 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 680 {
 681         int ch;
 682
 683         if (feof(fp))
 684                 return EOF;
 685
 686         strbuf_reset(sb);
 687         flockfile(fp);
 688         while ((ch = getc_unlocked(fp)) != EOF) {
 689                 if (!strbuf_avail(sb))
 690                         strbuf_grow(sb, 1);
 691                 sb->buf[sb->len++] = ch;
 692                 if (ch == term)
 693                         break;
 694         }
 695         funlockfile(fp);
 696         if (ch == EOF && sb->len == 0)
 697                 return EOF;
 698
 699         sb->buf[sb->len] = '\0';
 700         return 0;
 701 }
 702 #endif
 703
 704 int strbuf_appendwholeline(struct strbuf *sb, FILE *fp, int term)
 705 {
 706         struct strbuf line = STRBUF_INIT;
 707         if (strbuf_getwholeline(&line, fp, term))
 708                 return EOF;
 709         strbuf_addbuf(sb, &line);
 710         strbuf_release(&line);
 711         return 0;
 712 }
 713
 714 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
 715 {
 716         if (strbuf_getwholeline(sb, fp, term))
 717                 return EOF;
 718         if (sb->buf[sb->len - 1] == term)
 719                 strbuf_setlen(sb, sb->len - 1);
 720         return 0;
 721 }
 722
 723 int strbuf_getline(struct strbuf *sb, FILE *fp)
 724 {
 725         if (strbuf_getwholeline(sb, fp, '\n'))
 726                 return EOF;
 727         if (sb->buf[sb->len - 1] == '\n') {
 728                 strbuf_setlen(sb, sb->len - 1);
 729                 if (sb->len && sb->buf[sb->len - 1] == '\r')
 730                         strbuf_setlen(sb, sb->len - 1);
 731         }
 732         return 0;
 733 }
 734
 735 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 736 {
 737         return strbuf_getdelim(sb, fp, '\n');
 738 }
 739
 740 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 741 {
 742         return strbuf_getdelim(sb, fp, '\0');
 743 }
 744
 745 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 746 {
 747         strbuf_reset(sb);
 748
 749         while (1) {
 750                 char ch;
 751                 ssize_t len = xread(fd, &ch, 1);
 752                 if (len <= 0)
 753                         return EOF;
 754                 strbuf_addch(sb, ch);
 755                 if (ch == term)
 756                         break;
 757         }
 758         return 0;
 759 }
 760
 761 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 762 {
 763         int fd;
 764         ssize_t len;
 765         int saved_errno;
 766
 767         fd = open(path, O_RDONLY);
 768         if (fd < 0)
 769                 return -1;
 770         len = strbuf_read(sb, fd, hint);
 771         saved_errno = errno;
 772         close(fd);
 773         if (len < 0) {
 774                 errno = saved_errno;
 775                 return -1;
 776         }
 777
 778         return len;
 779 }
 780
 781 void strbuf_add_lines(struct strbuf *out, const char *prefix,
 782                       const char *buf, size_t size)
 783 {
 784         add_lines(out, prefix, NULL, buf, size);
 785 }
 786
 787 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
 788 {
 789         while (*s) {
 790                 size_t len = strcspn(s, "\"<>&");
 791                 strbuf_add(buf, s, len);
 792                 s += len;
 793                 switch (*s) {
 794                 case '"':
 795                         strbuf_addstr(buf, "&quot;");
 796                         break;
 797                 case '<':
 798                         strbuf_addstr(buf, "&lt;");
 799                         break;
 800                 case '>':
 801                         strbuf_addstr(buf, "&gt;");
 802                         break;
 803                 case '&':
 804                         strbuf_addstr(buf, "&amp;");
 805                         break;
 806                 case 0:
 807                         return;
 808                 }
 809                 s++;
 810         }
 811 }
 812
 813 int is_rfc3986_reserved_or_unreserved(char ch)
 814 {
 815         if (is_rfc3986_unreserved(ch))
 816                 return 1;
 817         switch (ch) {
 818                 case '!': case '*': case '\'': case '(': case ')': case ';':
 819                 case ':': case '@': case '&': case '=': case '+': case '$':
 820                 case ',': case '/': case '?': case '#': case '[': case ']':
 821                         return 1;
 822         }
 823         return 0;
 824 }
 825
 826 int is_rfc3986_unreserved(char ch)
 827 {
 828         return isalnum(ch) ||
 829                 ch == '-' || ch == '_' || ch == '.' || ch == '~';
 830 }
 831
 832 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 833                                  char_predicate allow_unencoded_fn)
 834 {
 835         strbuf_grow(sb, len);
 836         while (len--) {
 837                 char ch = *s++;
 838                 if (allow_unencoded_fn(ch))
 839                         strbuf_addch(sb, ch);
 840                 else
 841                         strbuf_addf(sb, "%%%02x", (unsigned char)ch);
 842         }
 843 }
 844
 845 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 846                              char_predicate allow_unencoded_fn)
 847 {
 848         strbuf_add_urlencode(sb, s, strlen(s), allow_unencoded_fn);
 849 }
 850
 851 static void strbuf_humanise(struct strbuf *buf, off_t bytes,
 852                                  int humanise_rate)
 853 {
 854         if (bytes > 1 << 30) {
 855                 strbuf_addf(buf,
 856                                 humanise_rate == 0 ?
 857                                         /* TRANSLATORS: IEC 80000-13:2008 gibibyte */
 858                                         _("%u.%2.2u GiB") :
 859                                         /* TRANSLATORS: IEC 80000-13:2008 gibibyte/second */
 860                                         _("%u.%2.2u GiB/s"),
 861                             (unsigned)(bytes >> 30),
 862                             (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
 863         } else if (bytes > 1 << 20) {
 864                 unsigned x = bytes + 5243;  /* for rounding */
 865                 strbuf_addf(buf,
 866                                 humanise_rate == 0 ?
 867                                         /* TRANSLATORS: IEC 80000-13:2008 mebibyte */
 868                                         _("%u.%2.2u MiB") :
 869                                         /* TRANSLATORS: IEC 80000-13:2008 mebibyte/second */
 870                                         _("%u.%2.2u MiB/s"),
 871                             x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 872         } else if (bytes > 1 << 10) {
 873                 unsigned x = bytes + 5;  /* for rounding */
 874                 strbuf_addf(buf,
 875                                 humanise_rate == 0 ?
 876                                         /* TRANSLATORS: IEC 80000-13:2008 kibibyte */
 877                                         _("%u.%2.2u KiB") :
 878                                         /* TRANSLATORS: IEC 80000-13:2008 kibibyte/second */
 879                                         _("%u.%2.2u KiB/s"),
 880                             x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 881         } else {
 882                 strbuf_addf(buf,
 883                                 humanise_rate == 0 ?
 884                                         /* TRANSLATORS: IEC 80000-13:2008 byte */
 885                                         Q_("%u byte", "%u bytes", bytes) :
 886                                         /* TRANSLATORS: IEC 80000-13:2008 byte/second */
 887                                         Q_("%u byte/s", "%u bytes/s", bytes),
 888                                 (unsigned)bytes);
 889         }
 890 }
 891
 892 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
 893 {
 894         strbuf_humanise(buf, bytes, 0);
 895 }
 896
 897 void strbuf_humanise_rate(struct strbuf *buf, off_t bytes)
 898 {
 899         strbuf_humanise(buf, bytes, 1);
 900 }
 901
 902 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
 903 {
 904         if (!*path)
 905                 die("The empty string is not a valid path");
 906         if (!is_absolute_path(path)) {
 907                 struct stat cwd_stat, pwd_stat;
 908                 size_t orig_len = sb->len;
 909                 char *cwd = xgetcwd();
 910                 char *pwd = getenv("PWD");
 911                 if (pwd && strcmp(pwd, cwd) &&
 912                     !stat(cwd, &cwd_stat) &&
 913                     (cwd_stat.st_dev || cwd_stat.st_ino) &&
 914                     !stat(pwd, &pwd_stat) &&
 915                     pwd_stat.st_dev == cwd_stat.st_dev &&
 916                     pwd_stat.st_ino == cwd_stat.st_ino)
 917                         strbuf_addstr(sb, pwd);
 918                 else
 919                         strbuf_addstr(sb, cwd);
 920                 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
 921                         strbuf_addch(sb, '/');
 922                 free(cwd);
 923         }
 924         strbuf_addstr(sb, path);
 925 }
 926
 927 void strbuf_add_real_path(struct strbuf *sb, const char *path)
 928 {
 929         if (sb->len) {
 930                 struct strbuf resolved = STRBUF_INIT;
 931                 strbuf_realpath(&resolved, path, 1);
 932                 strbuf_addbuf(sb, &resolved);
 933                 strbuf_release(&resolved);
 934         } else
 935                 strbuf_realpath(sb, path, 1);
 936 }
 937
 938 int printf_ln(const char *fmt, ...)
 939 {
 940         int ret;
 941         va_list ap;
 942         va_start(ap, fmt);
 943         ret = vprintf(fmt, ap);
 944         va_end(ap);
 945         if (ret < 0 || putchar('\n') == EOF)
 946                 return -1;
 947         return ret + 1;
 948 }
 949
 950 int fprintf_ln(FILE *fp, const char *fmt, ...)
 951 {
 952         int ret;
 953         va_list ap;
 954         va_start(ap, fmt);
 955         ret = vfprintf(fp, fmt, ap);
 956         va_end(ap);
 957         if (ret < 0 || putc('\n', fp) == EOF)
 958                 return -1;
 959         return ret + 1;
 960 }
 961
 962 char *xstrdup_tolower(const char *string)
 963 {
 964         char *result;
 965         size_t len, i;
 966
 967         len = strlen(string);
 968         result = xmallocz(len);
 969         for (i = 0; i < len; i++)
 970                 result[i] = tolower(string[i]);
 971         return result;
 972 }
 973
 974 char *xstrdup_toupper(const char *string)
 975 {
 976         char *result;
 977         size_t len, i;
 978
 979         len = strlen(string);
 980         result = xmallocz(len);
 981         for (i = 0; i < len; i++)
 982                 result[i] = toupper(string[i]);
 983         return result;
 984 }
 985
 986 char *xstrvfmt(const char *fmt, va_list ap)
 987 {
 988         struct strbuf buf = STRBUF_INIT;
 989         strbuf_vaddf(&buf, fmt, ap);
 990         return strbuf_detach(&buf, NULL);
 991 }
 992
 993 char *xstrfmt(const char *fmt, ...)
 994 {
 995         va_list ap;
 996         char *ret;
 997
 998         va_start(ap, fmt);
 999         ret = xstrvfmt(fmt, ap);
1000         va_end(ap);
1001
1002         return ret;
1003 }
1004
1005 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
1006                      int tz_offset, int suppress_tz_name)
1007 {
1008         struct strbuf munged_fmt = STRBUF_INIT;
1009         size_t hint = 128;
1010         size_t len;
1011
1012         if (!*fmt)
1013                 return;
1014
1015         /*
1016          * There is no portable way to pass timezone information to
1017          * strftime, so we handle %z and %Z here. Likewise '%s', because
1018          * going back to an epoch time requires knowing the zone.
1019          *
1020          * Note that tz_offset is in the "[-+]HHMM" decimal form; this is what
1021          * we want for %z, but the computation for %s has to convert to number
1022          * of seconds.
1023          */
1024         for (;;) {
1025                 const char *percent = strchrnul(fmt, '%');
1026                 strbuf_add(&munged_fmt, fmt, percent - fmt);
1027                 if (!*percent)
1028                         break;
1029                 fmt = percent + 1;
1030                 switch (*fmt) {
1031                 case '%':
1032                         strbuf_addstr(&munged_fmt, "%%");
1033                         fmt++;
1034                         break;
1035                 case 's':
1036                         strbuf_addf(&munged_fmt, "%"PRItime,
1037                                     (timestamp_t)tm_to_time_t(tm) -
1038                                     3600 * (tz_offset / 100) -
1039                                     60 * (tz_offset % 100));
1040                         fmt++;
1041                         break;
1042                 case 'z':
1043                         strbuf_addf(&munged_fmt, "%+05d", tz_offset);
1044                         fmt++;
1045                         break;
1046                 case 'Z':
1047                         if (suppress_tz_name) {
1048                                 fmt++;
1049                                 break;
1050                         }
1051                         /* FALLTHROUGH */
1052                 default:
1053                         strbuf_addch(&munged_fmt, '%');
1054                 }
1055         }
1056         fmt = munged_fmt.buf;
1057
1058         strbuf_grow(sb, hint);
1059         len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
1060
1061         if (!len) {
1062                 /*
1063                  * strftime reports "0" if it could not fit the result in the buffer.
1064                  * Unfortunately, it also reports "0" if the requested time string
1065                  * takes 0 bytes. So our strategy is to munge the format so that the
1066                  * output contains at least one character, and then drop the extra
1067                  * character before returning.
1068                  */
1069                 strbuf_addch(&munged_fmt, ' ');
1070                 while (!len) {
1071                         hint *= 2;
1072                         strbuf_grow(sb, hint);
1073                         len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
1074                                        munged_fmt.buf, tm);
1075                 }
1076                 len--; /* drop munged space */
1077         }
1078         strbuf_release(&munged_fmt);
1079         strbuf_setlen(sb, sb->len + len);
1080 }
1081
1082 void strbuf_repo_add_unique_abbrev(struct strbuf *sb, struct repository *repo,
1083                                    const struct object_id *oid, int abbrev_len)
1084 {
1085         int r;
1086         strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
1087         r = repo_find_unique_abbrev_r(repo, sb->buf + sb->len, oid, abbrev_len);
1088         strbuf_setlen(sb, sb->len + r);
1089 }
1090
1091 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
1092                               int abbrev_len)
1093 {
1094         strbuf_repo_add_unique_abbrev(sb, the_repository, oid, abbrev_len);
1095 }
1096
1097 /*
1098  * Returns the length of a line, without trailing spaces.
1099  *
1100  * If the line ends with newline, it will be removed too.
1101  */
1102 static size_t cleanup(char *line, size_t len)
1103 {
1104         while (len) {
1105                 unsigned char c = line[len - 1];
1106                 if (!isspace(c))
1107                         break;
1108                 len--;
1109         }
1110
1111         return len;
1112 }
1113
1114 /*
1115  * Remove empty lines from the beginning and end
1116  * and also trailing spaces from every line.
1117  *
1118  * Turn multiple consecutive empty lines between paragraphs
1119  * into just one empty line.
1120  *
1121  * If the input has only empty lines and spaces,
1122  * no output will be produced.
1123  *
1124  * If last line does not have a newline at the end, one is added.
1125  *
1126  * Enable skip_comments to skip every line starting with comment
1127  * character.
1128  */
1129 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
1130 {
1131         size_t empties = 0;
1132         size_t i, j, len, newlen;
1133         char *eol;
1134
1135         /* We may have to add a newline. */
1136         strbuf_grow(sb, 1);
1137
1138         for (i = j = 0; i < sb->len; i += len, j += newlen) {
1139                 eol = memchr(sb->buf + i, '\n', sb->len - i);
1140                 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
1141
1142                 if (skip_comments && len && sb->buf[i] == comment_line_char) {
1143                         newlen = 0;
1144                         continue;
1145                 }
1146                 newlen = cleanup(sb->buf + i, len);
1147
1148                 /* Not just an empty line? */
1149                 if (newlen) {
1150                         if (empties > 0 && j > 0)
1151                                 sb->buf[j++] = '\n';
1152                         empties = 0;
1153                         memmove(sb->buf + j, sb->buf + i, newlen);
1154                         sb->buf[newlen + j++] = '\n';
1155                 } else {
1156                         empties++;
1157                 }
1158         }
1159
1160         strbuf_setlen(sb, j);
1161 }
1162
1163 int strbuf_normalize_path(struct strbuf *src)
1164 {
1165         struct strbuf dst = STRBUF_INIT;
1166
1167         strbuf_grow(&dst, src->len);
1168         if (normalize_path_copy(dst.buf, src->buf) < 0) {
1169                 strbuf_release(&dst);
1170                 return -1;
1171         }
1172
1173         /*
1174          * normalize_path does not tell us the new length, so we have to
1175          * compute it by looking for the new NUL it placed
1176          */
1177         strbuf_setlen(&dst, strlen(dst.buf));
1178         strbuf_swap(src, &dst);
1179         strbuf_release(&dst);
1180         return 0;
1181 }
1182
1183 int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
1184                               const char *const *env)
1185 {
1186         char *path2 = NULL;
1187         int fd, res = 0;
1188
1189         if (!is_absolute_path(path))
1190                 path = path2 = xstrdup(git_path("%s", path));
1191
1192         fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
1193         if (fd < 0)
1194                 res = error_errno(_("could not open '%s' for writing"), path);
1195         else if (write_in_full(fd, buffer->buf, buffer->len) < 0) {
1196                 res = error_errno(_("could not write to '%s'"), path);
1197                 close(fd);
1198         } else if (close(fd) < 0)
1199                 res = error_errno(_("could not close '%s'"), path);
1200         else {
1201                 strbuf_reset(buffer);
1202                 if (launch_editor(path, buffer, env) < 0)
1203                         res = error_errno(_("could not edit '%s'"), path);
1204                 unlink(path);
1205         }
1206
1207         free(path2);
1208         return res;
1209 }
1210
1211 void strbuf_strip_file_from_path(struct strbuf *sb)
1212 {
1213         char *path_sep = find_last_dir_sep(sb->buf);
1214         strbuf_setlen(sb, path_sep ? path_sep - sb->buf + 1 : 0);
1215 }