4 int prefixcmp(const char *str, const char *prefix)
6 for (; ; str++, prefix++)
9 else if (*str != *prefix)
10 return (unsigned char)*prefix - (unsigned char)*str;
13 int suffixcmp(const char *str, const char *suffix)
15 int len = strlen(str), suflen = strlen(suffix);
19 return strcmp(str + len - suflen, suffix);
23 * Used as the default ->buf value, so that people can always assume
24 * buf is non NULL and ->buf is NUL terminated even for a freshly
27 char strbuf_slopbuf[1];
29 void strbuf_init(struct strbuf *sb, size_t hint)
31 sb->alloc = sb->len = 0;
32 sb->buf = strbuf_slopbuf;
34 strbuf_grow(sb, hint);
39 void strbuf_release(struct strbuf *sb)
47 char *strbuf_detach(struct strbuf *sb, size_t *sz)
49 char *res = sb->alloc ? sb->buf : NULL;
56 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
63 sb->buf[sb->len] = '\0';
66 void strbuf_grow(struct strbuf *sb, size_t extra)
68 if (unsigned_add_overflows(extra, 1) ||
69 unsigned_add_overflows(sb->len, extra + 1))
70 die("you want to use way too much memory");
73 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
76 void strbuf_trim(struct strbuf *sb)
79 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
81 while (sb->len > 0 && isspace(*b)) {
85 memmove(sb->buf, b, sb->len);
86 sb->buf[sb->len] = '\0';
88 void strbuf_rtrim(struct strbuf *sb)
90 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
92 sb->buf[sb->len] = '\0';
95 void strbuf_ltrim(struct strbuf *sb)
98 while (sb->len > 0 && isspace(*b)) {
102 memmove(sb->buf, b, sb->len);
103 sb->buf[sb->len] = '\0';
106 struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
108 int alloc = 2, pos = 0;
113 ret = xcalloc(alloc, sizeof(struct strbuf *));
115 while (n < sb->buf + sb->len) {
117 n = memchr(n, delim, sb->len - (n - sb->buf));
118 if (pos + 1 >= alloc) {
120 ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
123 n = sb->buf + sb->len - 1;
125 t = xmalloc(sizeof(struct strbuf));
127 strbuf_add(t, p, len);
135 void strbuf_list_free(struct strbuf **sbs)
137 struct strbuf **s = sbs;
146 int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
148 int len = a->len < b->len ? a->len: b->len;
149 int cmp = memcmp(a->buf, b->buf, len);
152 return a->len < b->len ? -1: a->len != b->len;
155 void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
156 const void *data, size_t dlen)
158 if (unsigned_add_overflows(pos, len))
159 die("you want to use way too much memory");
161 die("`pos' is too far after the end of the buffer");
162 if (pos + len > sb->len)
163 die("`pos + len' is too far after the end of the buffer");
166 strbuf_grow(sb, dlen - len);
167 memmove(sb->buf + pos + dlen,
169 sb->len - pos - len);
170 memcpy(sb->buf + pos, data, dlen);
171 strbuf_setlen(sb, sb->len + dlen - len);
174 void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
176 strbuf_splice(sb, pos, 0, data, len);
179 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
181 strbuf_splice(sb, pos, len, NULL, 0);
184 void strbuf_add(struct strbuf *sb, const void *data, size_t len)
186 strbuf_grow(sb, len);
187 memcpy(sb->buf + sb->len, data, len);
188 strbuf_setlen(sb, sb->len + len);
191 void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
193 strbuf_grow(sb, len);
194 memcpy(sb->buf + sb->len, sb->buf + pos, len);
195 strbuf_setlen(sb, sb->len + len);
198 void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
202 strbuf_vaddf(sb, fmt, ap);
206 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
211 if (!strbuf_avail(sb))
214 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
217 die("BUG: your vsnprintf is broken (returned %d)", len);
218 if (len > strbuf_avail(sb)) {
219 strbuf_grow(sb, len);
220 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
221 if (len > strbuf_avail(sb))
222 die("BUG: your vsnprintf is broken (insatiable)");
224 strbuf_setlen(sb, sb->len + len);
227 void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
234 percent = strchrnul(format, '%');
235 strbuf_add(sb, format, percent - format);
238 format = percent + 1;
240 if (*format == '%') {
241 strbuf_addch(sb, '%');
246 consumed = fn(sb, format, context);
250 strbuf_addch(sb, '%');
254 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
257 struct strbuf_expand_dict_entry *e = context;
260 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
261 if (!strncmp(placeholder, e->placeholder, len)) {
263 strbuf_addstr(sb, e->value);
270 void strbuf_addbuf_percentquote(struct strbuf *dst, const struct strbuf *src)
272 int i, len = src->len;
274 for (i = 0; i < len; i++) {
275 if (src->buf[i] == '%')
276 strbuf_addch(dst, '%');
277 strbuf_addch(dst, src->buf[i]);
281 size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
284 size_t oldalloc = sb->alloc;
286 strbuf_grow(sb, size);
287 res = fread(sb->buf + sb->len, 1, size, f);
289 strbuf_setlen(sb, sb->len + res);
290 else if (oldalloc == 0)
295 ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
297 size_t oldlen = sb->len;
298 size_t oldalloc = sb->alloc;
300 strbuf_grow(sb, hint ? hint : 8192);
304 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
309 strbuf_setlen(sb, oldlen);
315 strbuf_grow(sb, 8192);
318 sb->buf[sb->len] = '\0';
319 return sb->len - oldlen;
322 #define STRBUF_MAXLINK (2*PATH_MAX)
324 int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
326 size_t oldalloc = sb->alloc;
331 while (hint < STRBUF_MAXLINK) {
334 strbuf_grow(sb, hint);
335 len = readlink(path, sb->buf, hint);
339 } else if (len < hint) {
340 strbuf_setlen(sb, len);
344 /* .. the buffer was too small - try again */
352 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
361 while ((ch = fgetc(fp)) != EOF) {
363 sb->buf[sb->len++] = ch;
367 if (ch == EOF && sb->len == 0)
370 sb->buf[sb->len] = '\0';
374 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
376 if (strbuf_getwholeline(sb, fp, term))
378 if (sb->buf[sb->len-1] == term)
379 strbuf_setlen(sb, sb->len-1);
383 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
387 fd = open(path, O_RDONLY);
390 len = strbuf_read(sb, fd, hint);