5 int starts_with(const char *str, const char *prefix)
7 for (; ; str++, prefix++)
10 else if (*str != *prefix)
15 * Used as the default ->buf value, so that people can always assume
16 * buf is non NULL and ->buf is NUL terminated even for a freshly
19 char strbuf_slopbuf[1];
21 void strbuf_init(struct strbuf *sb, size_t hint)
23 sb->alloc = sb->len = 0;
24 sb->buf = strbuf_slopbuf;
26 strbuf_grow(sb, hint);
29 void strbuf_release(struct strbuf *sb)
37 char *strbuf_detach(struct strbuf *sb, size_t *sz)
48 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
55 sb->buf[sb->len] = '\0';
58 void strbuf_grow(struct strbuf *sb, size_t extra)
60 int new_buf = !sb->alloc;
61 if (unsigned_add_overflows(extra, 1) ||
62 unsigned_add_overflows(sb->len, extra + 1))
63 die("you want to use way too much memory");
66 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
71 void strbuf_trim(struct strbuf *sb)
76 void strbuf_rtrim(struct strbuf *sb)
78 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
80 sb->buf[sb->len] = '\0';
83 void strbuf_ltrim(struct strbuf *sb)
86 while (sb->len > 0 && isspace(*b)) {
90 memmove(sb->buf, b, sb->len);
91 sb->buf[sb->len] = '\0';
94 int strbuf_reencode(struct strbuf *sb, const char *from, const char *to)
99 if (same_encoding(from, to))
102 out = reencode_string_len(sb->buf, sb->len, to, from, &len);
106 strbuf_attach(sb, out, len, len);
110 void strbuf_tolower(struct strbuf *sb)
112 char *p = sb->buf, *end = sb->buf + sb->len;
117 struct strbuf **strbuf_split_buf(const char *str, size_t slen,
118 int terminator, int max)
120 struct strbuf **ret = NULL;
121 size_t nr = 0, alloc = 0;
126 if (max <= 0 || nr + 1 < max) {
127 const char *end = memchr(str, terminator, slen);
131 t = xmalloc(sizeof(struct strbuf));
133 strbuf_add(t, str, len);
134 ALLOC_GROW(ret, nr + 2, alloc);
139 ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
144 void strbuf_list_free(struct strbuf **sbs)
146 struct strbuf **s = sbs;
155 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
157 int len = a->len < b->len ? a->len: b->len;
158 int cmp = memcmp(a->buf, b->buf, len);
161 return a->len < b->len ? -1: a->len != b->len;
164 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
165 const void *data, size_t dlen)
167 if (unsigned_add_overflows(pos, len))
168 die("you want to use way too much memory");
170 die("`pos' is too far after the end of the buffer");
171 if (pos + len > sb->len)
172 die("`pos + len' is too far after the end of the buffer");
175 strbuf_grow(sb, dlen - len);
176 memmove(sb->buf + pos + dlen,
178 sb->len - pos - len);
179 memcpy(sb->buf + pos, data, dlen);
180 strbuf_setlen(sb, sb->len + dlen - len);
183 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
185 strbuf_splice(sb, pos, 0, data, len);
188 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
190 strbuf_splice(sb, pos, len, NULL, 0);
193 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
195 strbuf_grow(sb, len);
196 memcpy(sb->buf + sb->len, data, len);
197 strbuf_setlen(sb, sb->len + len);
200 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
202 strbuf_grow(sb, len);
203 memcpy(sb->buf + sb->len, sb->buf + pos, len);
204 strbuf_setlen(sb, sb->len + len);
207 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
211 strbuf_vaddf(sb, fmt, ap);
215 static void add_lines(struct strbuf *out,
218 const char *buf, size_t size)
222 const char *next = memchr(buf, '\n', size);
223 next = next ? (next + 1) : (buf + size);
225 prefix = (prefix2 && buf[0] == '\n') ? prefix2 : prefix1;
226 strbuf_addstr(out, prefix);
227 strbuf_add(out, buf, next - buf);
231 strbuf_complete_line(out);
234 void strbuf_add_commented_lines(struct strbuf *out, const char *buf, size_t size)
236 static char prefix1[3];
237 static char prefix2[2];
239 if (prefix1[0] != comment_line_char) {
240 sprintf(prefix1, "%c ", comment_line_char);
241 sprintf(prefix2, "%c", comment_line_char);
243 add_lines(out, prefix1, prefix2, buf, size);
246 void strbuf_commented_addf(struct strbuf *sb, const char *fmt, ...)
249 struct strbuf buf = STRBUF_INIT;
250 int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
252 va_start(params, fmt);
253 strbuf_vaddf(&buf, fmt, params);
256 strbuf_add_commented_lines(sb, buf.buf, buf.len);
258 sb->buf[--sb->len] = '\0';
260 strbuf_release(&buf);
263 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
268 if (!strbuf_avail(sb))
271 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
274 die("BUG: your vsnprintf is broken (returned %d)", len);
275 if (len > strbuf_avail(sb)) {
276 strbuf_grow(sb, len);
277 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
278 if (len > strbuf_avail(sb))
279 die("BUG: your vsnprintf is broken (insatiable)");
281 strbuf_setlen(sb, sb->len + len);
284 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
291 percent = strchrnul(format, '%');
292 strbuf_add(sb, format, percent - format);
295 format = percent + 1;
297 if (*format == '%') {
298 strbuf_addch(sb, '%');
303 consumed = fn(sb, format, context);
307 strbuf_addch(sb, '%');
311 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
314 struct strbuf_expand_dict_entry *e = context;
317 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
318 if (!strncmp(placeholder, e->placeholder, len)) {
320 strbuf_addstr(sb, e->value);
327 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
329 int i, len = src->len;
331 for (i = 0; i < len; i++) {
332 if (src->buf[i] == '%')
333 strbuf_addch(dst, '%');
334 strbuf_addch(dst, src->buf[i]);
338 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
341 size_t oldalloc = sb->alloc;
343 strbuf_grow(sb, size);
344 res = fread(sb->buf + sb->len, 1, size, f);
346 strbuf_setlen(sb, sb->len + res);
347 else if (oldalloc == 0)
352 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
354 size_t oldlen = sb->len;
355 size_t oldalloc = sb->alloc;
357 strbuf_grow(sb, hint ? hint : 8192);
361 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
366 strbuf_setlen(sb, oldlen);
372 strbuf_grow(sb, 8192);
375 sb->buf[sb->len] = '\0';
376 return sb->len - oldlen;
379 #define STRBUF_MAXLINK (2*PATH_MAX)
381 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
383 size_t oldalloc = sb->alloc;
388 while (hint < STRBUF_MAXLINK) {
391 strbuf_grow(sb, hint);
392 len = readlink(path, sb->buf, hint);
396 } else if (len < hint) {
397 strbuf_setlen(sb, len);
401 /* .. the buffer was too small - try again */
409 int strbuf_getcwd(struct strbuf *sb)
411 size_t oldalloc = sb->alloc;
412 size_t guessed_len = 128;
414 for (;; guessed_len *= 2) {
415 strbuf_grow(sb, guessed_len);
416 if (getcwd(sb->buf, sb->alloc)) {
417 strbuf_setlen(sb, strlen(sb->buf));
430 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
438 while ((ch = fgetc(fp)) != EOF) {
440 sb->buf[sb->len++] = ch;
444 if (ch == EOF && sb->len == 0)
447 sb->buf[sb->len] = '\0';
451 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
453 if (strbuf_getwholeline(sb, fp, term))
455 if (sb->buf[sb->len-1] == term)
456 strbuf_setlen(sb, sb->len-1);
460 int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
466 ssize_t len = xread(fd, &ch, 1);
469 strbuf_addch(sb, ch);
476 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
480 fd = open(path, O_RDONLY);
483 len = strbuf_read(sb, fd, hint);
491 void strbuf_add_lines(struct strbuf *out, const char *prefix,
492 const char *buf, size_t size)
494 add_lines(out, prefix, NULL, buf, size);
497 void strbuf_addstr_xml_quoted(struct strbuf *buf, const char *s)
500 size_t len = strcspn(s, "\"<>&");
501 strbuf_add(buf, s, len);
505 strbuf_addstr(buf, """);
508 strbuf_addstr(buf, "<");
511 strbuf_addstr(buf, ">");
514 strbuf_addstr(buf, "&");
523 static int is_rfc3986_reserved(char ch)
526 case '!': case '*': case '\'': case '(': case ')': case ';':
527 case ':': case '@': case '&': case '=': case '+': case '$':
528 case ',': case '/': case '?': case '#': case '[': case ']':
534 static int is_rfc3986_unreserved(char ch)
536 return isalnum(ch) ||
537 ch == '-' || ch == '_' || ch == '.' || ch == '~';
540 static void strbuf_add_urlencode(struct strbuf *sb, const char *s, size_t len,
543 strbuf_grow(sb, len);
546 if (is_rfc3986_unreserved(ch) ||
547 (!reserved && is_rfc3986_reserved(ch)))
548 strbuf_addch(sb, ch);
550 strbuf_addf(sb, "%%%02x", ch);
554 void strbuf_addstr_urlencode(struct strbuf *sb, const char *s,
557 strbuf_add_urlencode(sb, s, strlen(s), reserved);
560 void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
562 if (bytes > 1 << 30) {
563 strbuf_addf(buf, "%u.%2.2u GiB",
565 (int)(bytes & ((1 << 30) - 1)) / 10737419);
566 } else if (bytes > 1 << 20) {
567 int x = bytes + 5243; /* for rounding */
568 strbuf_addf(buf, "%u.%2.2u MiB",
569 x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
570 } else if (bytes > 1 << 10) {
571 int x = bytes + 5; /* for rounding */
572 strbuf_addf(buf, "%u.%2.2u KiB",
573 x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
575 strbuf_addf(buf, "%u bytes", (int)bytes);
579 void strbuf_add_absolute_path(struct strbuf *sb, const char *path)
582 die("The empty string is not a valid path");
583 if (!is_absolute_path(path)) {
584 struct stat cwd_stat, pwd_stat;
585 size_t orig_len = sb->len;
586 char *cwd = xgetcwd();
587 char *pwd = getenv("PWD");
588 if (pwd && strcmp(pwd, cwd) &&
589 !stat(cwd, &cwd_stat) &&
590 (cwd_stat.st_dev || cwd_stat.st_ino) &&
591 !stat(pwd, &pwd_stat) &&
592 pwd_stat.st_dev == cwd_stat.st_dev &&
593 pwd_stat.st_ino == cwd_stat.st_ino)
594 strbuf_addstr(sb, pwd);
596 strbuf_addstr(sb, cwd);
597 if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
598 strbuf_addch(sb, '/');
601 strbuf_addstr(sb, path);
604 int printf_ln(const char *fmt, ...)
609 ret = vprintf(fmt, ap);
611 if (ret < 0 || putchar('\n') == EOF)
616 int fprintf_ln(FILE *fp, const char *fmt, ...)
621 ret = vfprintf(fp, fmt, ap);
623 if (ret < 0 || putc('\n', fp) == EOF)
628 char *xstrdup_tolower(const char *string)
633 len = strlen(string);
634 result = xmalloc(len + 1);
635 for (i = 0; i < len; i++)
636 result[i] = tolower(string[i]);
641 char *xstrvfmt(const char *fmt, va_list ap)
643 struct strbuf buf = STRBUF_INIT;
644 strbuf_vaddf(&buf, fmt, ap);
645 return strbuf_detach(&buf, NULL);
648 char *xstrfmt(const char *fmt, ...)
654 ret = xstrvfmt(fmt, ap);