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_remove(struct strbuf *sb, size_t pos, size_t len)
 253 {
 254         strbuf_splice(sb, pos, len, "", 0);
 255 }
 256
 257 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
 258 {
 259         strbuf_grow(sb, len);
 260         memcpy(sb->buf + sb->len, data, len);
 261         strbuf_setlen(sb, sb->len + len);
 262 }
 263
 264 void strbuf_addbuf(struct strbuf *sb, const struct strbuf *sb2)
 265 {
 266         strbuf_grow(sb, sb2->len);
 267         memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
 268         strbuf_setlen(sb, sb->len + sb2->len);
 269 }
 270
 271 void strbuf_addchars(struct strbuf *sb, int c, size_t n)
 272 {
 273         strbuf_grow(sb, n);
 274         memset(sb->buf + sb->len, c, n);
 275         strbuf_setlen(sb, sb->len + n);
 276 }
 277
 278 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
 279 {
 280         va_list ap;
 281         va_start(ap, fmt);
 282         strbuf_vaddf(sb, fmt, ap);
 283         va_end(ap);
 284 }
 285
 286 static void add_lines(struct strbuf *out,
 287                         const char *prefix1,
 288                         const char *prefix2,
 289                         const char *buf, size_t size)
 290 {
 291         while (size) {
 292                 const char *prefix;
 293                 const char *next = memchr(buf, '\n', size);
 294                 next = next ? (next + 1) : (buf + size);
 295
 296                 prefix = ((prefix2 && (buf[0] == '\n' || buf[0] == '\t'))
 297                           ? prefix2 : prefix1);
 298                 strbuf_addstr(out, prefix);
 299                 strbuf_add(out, buf, next - buf);
 300                 size -= next - buf;
 301                 buf = next;
 302         }
 303         strbuf_complete_line(out);
 304 }
 305
 306 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
 307 {
 308         static char prefix1[3];
 309         static char prefix2[2];
 310
 311         if (prefix1[0] != comment_line_char) {
 312                 xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
 313                 xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
 314         }
 315         add_lines(out, prefix1, prefix2, buf, size);
 316 }
 317
 318 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
 319 {
 320         va_list params;
 321         struct strbuf buf = STRBUF_INIT;
 322         int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
 323
 324         va_start(params, fmt);
 325         strbuf_vaddf(&buf, fmt, params);
 326         va_end(params);
 327
 328         strbuf_add_commented_lines(sb, buf.buf, buf.len);
 329         if (incomplete_line)
 330                 sb->buf[--sb->len] = '\0';
 331
 332         strbuf_release(&buf);
 333 }
 334
 335 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
 336 {
 337         int len;
 338         va_list cp;
 339
 340         if (!strbuf_avail(sb))
 341                 strbuf_grow(sb, 64);
 342         va_copy(cp, ap);
 343         len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
 344         va_end(cp);
 345         if (len < 0)
 346                 BUG("your vsnprintf is broken (returned %d)", len);
 347         if (len > strbuf_avail(sb)) {
 348                 strbuf_grow(sb, len);
 349                 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 350                 if (len > strbuf_avail(sb))
 351                         BUG("your vsnprintf is broken (insatiable)");
 352         }
 353         strbuf_setlen(sb, sb->len + len);
 354 }
 355
 356 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
 357                    void *context)
 358 {
 359         for (;;) {
 360                 const char *percent;
 361                 size_t consumed;
 362
 363                 percent = strchrnul(format, '%');
 364                 strbuf_add(sb, format, percent - format);
 365                 if (!*percent)
 366                         break;
 367                 format = percent + 1;
 368
 369                 if (*format == '%') {
 370                         strbuf_addch(sb, '%');
 371                         format++;
 372                         continue;
 373                 }
 374
 375                 consumed = fn(sb, format, context);
 376                 if (consumed)
 377                         format += consumed;
 378                 else
 379                         strbuf_addch(sb, '%');
 380         }
 381 }
 382
 383 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
 384                 void *context)
 385 {
 386         struct strbuf_expand_dict_entry *e = context;
 387         size_t len;
 388
 389         for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
 390                 if (!strncmp(placeholder, e->placeholder, len)) {
 391                         if (e->value)
 392                                 strbuf_addstr(sb, e->value);
 393                         return len;
 394                 }
 395         }
 396         return 0;
 397 }
 398
 399 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
 400 {
 401         size_t i, len = src->len;
 402
 403         for (i = 0; i < len; i++) {
 404                 if (src->buf[i] == '%')
 405                         strbuf_addch(dst, '%');
 406                 strbuf_addch(dst, src->buf[i]);
 407         }
 408 }
 409
 410 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
 411 {
 412         size_t res;
 413         size_t oldalloc = sb->alloc;
 414
 415         strbuf_grow(sb, size);
 416         res = fread(sb->buf + sb->len, 1, size, f);
 417         if (res > 0)
 418                 strbuf_setlen(sb, sb->len + res);
 419         else if (oldalloc == 0)
 420                 strbuf_release(sb);
 421         return res;
 422 }
 423
 424 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
 425 {
 426         size_t oldlen = sb->len;
 427         size_t oldalloc = sb->alloc;
 428
 429         strbuf_grow(sb, hint ? hint : 8192);
 430         for (;;) {
 431                 ssize_t want = sb->alloc - sb->len - 1;
 432                 ssize_t got = read_in_full(fd, sb->buf + sb->len, want);
 433
 434                 if (got < 0) {
 435                         if (oldalloc == 0)
 436                                 strbuf_release(sb);
 437                         else
 438                                 strbuf_setlen(sb, oldlen);
 439                         return -1;
 440                 }
 441                 sb->len += got;
 442                 if (got < want)
 443                         break;
 444                 strbuf_grow(sb, 8192);
 445         }
 446
 447         sb->buf[sb->len] = '\0';
 448         return sb->len - oldlen;
 449 }
 450
 451 ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
 452 {
 453         size_t oldalloc = sb->alloc;
 454         ssize_t cnt;
 455
 456         strbuf_grow(sb, hint ? hint : 8192);
 457         cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
 458         if (cnt > 0)
 459                 strbuf_setlen(sb, sb->len + cnt);
 460         else if (oldalloc == 0)
 461                 strbuf_release(sb);
 462         return cnt;
 463 }
 464
 465 ssize_t strbuf_write(struct strbuf *sb, FILE *f)
 466 {
 467         return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
 468 }
 469
 470
 471 #define STRBUF_MAXLINK (2*PATH_MAX)
 472
 473 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
 474 {
 475         size_t oldalloc = sb->alloc;
 476
 477         if (hint < 32)
 478                 hint = 32;
 479
 480         while (hint < STRBUF_MAXLINK) {
 481                 ssize_t len;
 482
 483                 strbuf_grow(sb, hint);
 484                 len = readlink(path, sb->buf, hint);
 485                 if (len < 0) {
 486                         if (errno != ERANGE)
 487                                 break;
 488                 } else if (len < hint) {
 489                         strbuf_setlen(sb, len);
 490                         return 0;
 491                 }
 492
 493                 /* .. the buffer was too small - try again */
 494                 hint *= 2;
 495         }
 496         if (oldalloc == 0)
 497                 strbuf_release(sb);
 498         return -1;
 499 }
 500
 501 int strbuf_getcwd(struct strbuf *sb)
 502 {
 503         size_t oldalloc = sb->alloc;
 504         size_t guessed_len = 128;
 505
 506         for (;; guessed_len *= 2) {
 507                 strbuf_grow(sb, guessed_len);
 508                 if (getcwd(sb->buf, sb->alloc)) {
 509                         strbuf_setlen(sb, strlen(sb->buf));
 510                         return 0;
 511                 }
 512
 513                 /*
 514                  * If getcwd(3) is implemented as a syscall that falls
 515                  * back to a regular lookup using readdir(3) etc. then
 516                  * we may be able to avoid EACCES by providing enough
 517                  * space to the syscall as it's not necessarily bound
 518                  * to the same restrictions as the fallback.
 519                  */
 520                 if (errno == EACCES && guessed_len < PATH_MAX)
 521                         continue;
 522
 523                 if (errno != ERANGE)
 524                         break;
 525         }
 526         if (oldalloc == 0)
 527                 strbuf_release(sb);
 528         else
 529                 strbuf_reset(sb);
 530         return -1;
 531 }
 532
 533 #ifdef HAVE_GETDELIM
 534 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 535 {
 536         ssize_t r;
 537
 538         if (feof(fp))
 539                 return EOF;
 540
 541         strbuf_reset(sb);
 542
 543         /* Translate slopbuf to NULL, as we cannot call realloc on it */
 544         if (!sb->alloc)
 545                 sb->buf = NULL;
 546         errno = 0;
 547         r = getdelim(&sb->buf, &sb->alloc, term, fp);
 548
 549         if (r > 0) {
 550                 sb->len = r;
 551                 return 0;
 552         }
 553         assert(r == -1);
 554
 555         /*
 556          * Normally we would have called xrealloc, which will try to free
 557          * memory and recover. But we have no way to tell getdelim() to do so.
 558          * Worse, we cannot try to recover ENOMEM ourselves, because we have
 559          * no idea how many bytes were read by getdelim.
 560          *
 561          * Dying here is reasonable. It mirrors what xrealloc would do on
 562          * catastrophic memory failure. We skip the opportunity to free pack
 563          * memory and retry, but that's unlikely to help for a malloc small
 564          * enough to hold a single line of input, anyway.
 565          */
 566         if (errno == ENOMEM)
 567                 die("Out of memory, getdelim failed");
 568
 569         /*
 570          * Restore strbuf invariants; if getdelim left us with a NULL pointer,
 571          * we can just re-init, but otherwise we should make sure that our
 572          * length is empty, and that the result is NUL-terminated.
 573          */
 574         if (!sb->buf)
 575                 strbuf_init(sb, 0);
 576         else
 577                 strbuf_reset(sb);
 578         return EOF;
 579 }
 580 #else
 581 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
 582 {
 583         int ch;
 584
 585         if (feof(fp))
 586                 return EOF;
 587
 588         strbuf_reset(sb);
 589         flockfile(fp);
 590         while ((ch = getc_unlocked(fp)) != EOF) {
 591                 if (!strbuf_avail(sb))
 592                         strbuf_grow(sb, 1);
 593                 sb->buf[sb->len++] = ch;
 594                 if (ch == term)
 595                         break;
 596         }
 597         funlockfile(fp);
 598         if (ch == EOF && sb->len == 0)
 599                 return EOF;
 600
 601         sb->buf[sb->len] = '\0';
 602         return 0;
 603 }
 604 #endif
 605
 606 static int strbuf_getdelim(struct strbuf *sb, FILE *fp, int term)
 607 {
 608         if (strbuf_getwholeline(sb, fp, term))
 609                 return EOF;
 610         if (sb->buf[sb->len - 1] == term)
 611                 strbuf_setlen(sb, sb->len - 1);
 612         return 0;
 613 }
 614
 615 int strbuf_getline(struct strbuf *sb, FILE *fp)
 616 {
 617         if (strbuf_getwholeline(sb, fp, '\n'))
 618                 return EOF;
 619         if (sb->buf[sb->len - 1] == '\n') {
 620                 strbuf_setlen(sb, sb->len - 1);
 621                 if (sb->len && sb->buf[sb->len - 1] == '\r')
 622                         strbuf_setlen(sb, sb->len - 1);
 623         }
 624         return 0;
 625 }
 626
 627 int strbuf_getline_lf(struct strbuf *sb, FILE *fp)
 628 {
 629         return strbuf_getdelim(sb, fp, '\n');
 630 }
 631
 632 int strbuf_getline_nul(struct strbuf *sb, FILE *fp)
 633 {
 634         return strbuf_getdelim(sb, fp, '\0');
 635 }
 636
 637 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
 638 {
 639         strbuf_reset(sb);
 640
 641         while (1) {
 642                 char ch;
 643                 ssize_t len = xread(fd, &ch, 1);
 644                 if (len <= 0)
 645                         return EOF;
 646                 strbuf_addch(sb, ch);
 647                 if (ch == term)
 648                         break;
 649         }
 650         return 0;
 651 }
 652
 653 ssize_t strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
 654 {
 655         int fd;
 656         ssize_t len;
 657         int saved_errno;
 658
 659         fd = open(path, O_RDONLY);
 660         if (fd < 0)
 661                 return -1;
 662         len = strbuf_read(sb, fd, hint);
 663         saved_errno = errno;
 664         close(fd);
 665         if (len < 0) {
 666                 errno = saved_errno;
 667                 return -1;
 668         }
 669
 670         return len;
 671 }
 672
 673 void strbuf_add_lines(struct strbuf *out, const char *prefix,
 674                       const char *buf, size_t size)
 675 {
 676         add_lines(out, prefix, NULL, buf, size);
 677 }
 678
 679 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
 680 {
 681         while (*s) {
 682                 size_t len = strcspn(s, "\"<>&");
 683                 strbuf_add(buf, s, len);
 684                 s += len;
 685                 switch (*s) {
 686                 case '"':
 687                         strbuf_addstr(buf, "&quot;");
 688                         break;
 689                 case '<':
 690                         strbuf_addstr(buf, "&lt;");
 691                         break;
 692                 case '>':
 693                         strbuf_addstr(buf, "&gt;");
 694                         break;
 695                 case '&':
 696                         strbuf_addstr(buf, "&amp;");
 697                         break;
 698                 case 0:
 699                         return;
 700                 }
 701                 s++;
 702         }
 703 }
 704
 705 static int is_rfc3986_reserved(char ch)
 706 {
 707         switch (ch) {
 708                 case '!': case '*': case '\'': case '(': case ')': case ';':
 709                 case ':': case '@': case '&': case '=': case '+': case '$':
 710                 case ',': case '/': case '?': case '#': case '[': case ']':
 711                         return 1;
 712         }
 713         return 0;
 714 }
 715
 716 static int is_rfc3986_unreserved(char ch)
 717 {
 718         return isalnum(ch) ||
 719                 ch == '-' || ch == '_' || ch == '.' || ch == '~';
 720 }
 721
 722 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
 723                                  int reserved)
 724 {
 725         strbuf_grow(sb, len);
 726         while (len--) {
 727                 char ch = *s++;
 728                 if (is_rfc3986_unreserved(ch) ||
 729                     (!reserved && is_rfc3986_reserved(ch)))
 730                         strbuf_addch(sb, ch);
 731                 else
 732                         strbuf_addf(sb, "%%%02x", (unsigned char)ch);
 733         }
 734 }
 735
 736 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
 737                              int reserved)
 738 {
 739         strbuf_add_urlencode(sb, s, strlen(s), reserved);
 740 }
 741
 742 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
 743 {
 744         if (bytes > 1 << 30) {
 745                 strbuf_addf(buf, "%u.%2.2u GiB",
 746                             (unsigned)(bytes >> 30),
 747                             (unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
 748         } else if (bytes > 1 << 20) {
 749                 unsigned x = bytes + 5243;  /* for rounding */
 750                 strbuf_addf(buf, "%u.%2.2u MiB",
 751                             x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
 752         } else if (bytes > 1 << 10) {
 753                 unsigned x = bytes + 5;  /* for rounding */
 754                 strbuf_addf(buf, "%u.%2.2u KiB",
 755                             x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
 756         } else {
 757                 strbuf_addf(buf, "%u bytes", (unsigned)bytes);
 758         }
 759 }
 760
 761 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
 762 {
 763         if (!*path)
 764                 die("The empty string is not a valid path");
 765         if (!is_absolute_path(path)) {
 766                 struct stat cwd_stat, pwd_stat;
 767                 size_t orig_len = sb->len;
 768                 char *cwd = xgetcwd();
 769                 char *pwd = getenv("PWD");
 770                 if (pwd && strcmp(pwd, cwd) &&
 771                     !stat(cwd, &cwd_stat) &&
 772                     (cwd_stat.st_dev || cwd_stat.st_ino) &&
 773                     !stat(pwd, &pwd_stat) &&
 774                     pwd_stat.st_dev == cwd_stat.st_dev &&
 775                     pwd_stat.st_ino == cwd_stat.st_ino)
 776                         strbuf_addstr(sb, pwd);
 777                 else
 778                         strbuf_addstr(sb, cwd);
 779                 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
 780                         strbuf_addch(sb, '/');
 781                 free(cwd);
 782         }
 783         strbuf_addstr(sb, path);
 784 }
 785
 786 void strbuf_add_real_path(struct strbuf *sb, const char *path)
 787 {
 788         if (sb->len) {
 789                 struct strbuf resolved = STRBUF_INIT;
 790                 strbuf_realpath(&resolved, path, 1);
 791                 strbuf_addbuf(sb, &resolved);
 792                 strbuf_release(&resolved);
 793         } else
 794                 strbuf_realpath(sb, path, 1);
 795 }
 796
 797 int printf_ln(const char *fmt, ...)
 798 {
 799         int ret;
 800         va_list ap;
 801         va_start(ap, fmt);
 802         ret = vprintf(fmt, ap);
 803         va_end(ap);
 804         if (ret < 0 || putchar('\n') == EOF)
 805                 return -1;
 806         return ret + 1;
 807 }
 808
 809 int fprintf_ln(FILE *fp, const char *fmt, ...)
 810 {
 811         int ret;
 812         va_list ap;
 813         va_start(ap, fmt);
 814         ret = vfprintf(fp, fmt, ap);
 815         va_end(ap);
 816         if (ret < 0 || putc('\n', fp) == EOF)
 817                 return -1;
 818         return ret + 1;
 819 }
 820
 821 char *xstrdup_tolower(const char *string)
 822 {
 823         char *result;
 824         size_t len, i;
 825
 826         len = strlen(string);
 827         result = xmallocz(len);
 828         for (i = 0; i < len; i++)
 829                 result[i] = tolower(string[i]);
 830         return result;
 831 }
 832
 833 char *xstrdup_toupper(const char *string)
 834 {
 835         char *result;
 836         size_t len, i;
 837
 838         len = strlen(string);
 839         result = xmallocz(len);
 840         for (i = 0; i < len; i++)
 841                 result[i] = toupper(string[i]);
 842         return result;
 843 }
 844
 845 char *xstrvfmt(const char *fmt, va_list ap)
 846 {
 847         struct strbuf buf = STRBUF_INIT;
 848         strbuf_vaddf(&buf, fmt, ap);
 849         return strbuf_detach(&buf, NULL);
 850 }
 851
 852 char *xstrfmt(const char *fmt, ...)
 853 {
 854         va_list ap;
 855         char *ret;
 856
 857         va_start(ap, fmt);
 858         ret = xstrvfmt(fmt, ap);
 859         va_end(ap);
 860
 861         return ret;
 862 }
 863
 864 void strbuf_addftime(struct strbuf *sb, const char *fmt, const struct tm *tm,
 865                      int tz_offset, int suppress_tz_name)
 866 {
 867         struct strbuf munged_fmt = STRBUF_INIT;
 868         size_t hint = 128;
 869         size_t len;
 870
 871         if (!*fmt)
 872                 return;
 873
 874         /*
 875          * There is no portable way to pass timezone information to
 876          * strftime, so we handle %z and %Z here.
 877          */
 878         for (;;) {
 879                 const char *percent = strchrnul(fmt, '%');
 880                 strbuf_add(&munged_fmt, fmt, percent - fmt);
 881                 if (!*percent)
 882                         break;
 883                 fmt = percent + 1;
 884                 switch (*fmt) {
 885                 case '%':
 886                         strbuf_addstr(&munged_fmt, "%%");
 887                         fmt++;
 888                         break;
 889                 case 'z':
 890                         strbuf_addf(&munged_fmt, "%+05d", tz_offset);
 891                         fmt++;
 892                         break;
 893                 case 'Z':
 894                         if (suppress_tz_name) {
 895                                 fmt++;
 896                                 break;
 897                         }
 898                         /* FALLTHROUGH */
 899                 default:
 900                         strbuf_addch(&munged_fmt, '%');
 901                 }
 902         }
 903         fmt = munged_fmt.buf;
 904
 905         strbuf_grow(sb, hint);
 906         len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);
 907
 908         if (!len) {
 909                 /*
 910                  * strftime reports "0" if it could not fit the result in the buffer.
 911                  * Unfortunately, it also reports "0" if the requested time string
 912                  * takes 0 bytes. So our strategy is to munge the format so that the
 913                  * output contains at least one character, and then drop the extra
 914                  * character before returning.
 915                  */
 916                 strbuf_addch(&munged_fmt, ' ');
 917                 while (!len) {
 918                         hint *= 2;
 919                         strbuf_grow(sb, hint);
 920                         len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
 921                                        munged_fmt.buf, tm);
 922                 }
 923                 len--; /* drop munged space */
 924         }
 925         strbuf_release(&munged_fmt);
 926         strbuf_setlen(sb, sb->len + len);
 927 }
 928
 929 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 930                               int abbrev_len)
 931 {
 932         int r;
 933         strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
 934         r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
 935         strbuf_setlen(sb, sb->len + r);
 936 }
 937
 938 /*
 939  * Returns the length of a line, without trailing spaces.
 940  *
 941  * If the line ends with newline, it will be removed too.
 942  */
 943 static size_t cleanup(char *line, size_t len)
 944 {
 945         while (len) {
 946                 unsigned char c = line[len - 1];
 947                 if (!isspace(c))
 948                         break;
 949                 len--;
 950         }
 951
 952         return len;
 953 }
 954
 955 /*
 956  * Remove empty lines from the beginning and end
 957  * and also trailing spaces from every line.
 958  *
 959  * Turn multiple consecutive empty lines between paragraphs
 960  * into just one empty line.
 961  *
 962  * If the input has only empty lines and spaces,
 963  * no output will be produced.
 964  *
 965  * If last line does not have a newline at the end, one is added.
 966  *
 967  * Enable skip_comments to skip every line starting with comment
 968  * character.
 969  */
 970 void strbuf_stripspace(struct strbuf *sb, int skip_comments)
 971 {
 972         size_t empties = 0;
 973         size_t i, j, len, newlen;
 974         char *eol;
 975
 976         /* We may have to add a newline. */
 977         strbuf_grow(sb, 1);
 978
 979         for (i = j = 0; i < sb->len; i += len, j += newlen) {
 980                 eol = memchr(sb->buf + i, '\n', sb->len - i);
 981                 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
 982
 983                 if (skip_comments && len && sb->buf[i] == comment_line_char) {
 984                         newlen = 0;
 985                         continue;
 986                 }
 987                 newlen = cleanup(sb->buf + i, len);
 988
 989                 /* Not just an empty line? */
 990                 if (newlen) {
 991                         if (empties > 0 && j > 0)
 992                                 sb->buf[j++] = '\n';
 993                         empties = 0;
 994                         memmove(sb->buf + j, sb->buf + i, newlen);
 995                         sb->buf[newlen + j++] = '\n';
 996                 } else {
 997                         empties++;
 998                 }
 999         }
1000
1001         strbuf_setlen(sb, j);
1002 }
1003
1004 int strbuf_normalize_path(struct strbuf *src)
1005 {
1006         struct strbuf dst = STRBUF_INIT;
1007
1008         strbuf_grow(&dst, src->len);
1009         if (normalize_path_copy(dst.buf, src->buf) < 0) {
1010                 strbuf_release(&dst);
1011                 return -1;
1012         }
1013
1014         /*
1015          * normalize_path does not tell us the new length, so we have to
1016          * compute it by looking for the new NUL it placed
1017          */
1018         strbuf_setlen(&dst, strlen(dst.buf));
1019         strbuf_swap(src, &dst);
1020         strbuf_release(&dst);
1021         return 0;
1022 }