Merge branch 'master' of git://git.kernel.org/pub/scm/git/git
[git/jnareb-git.git] / strbuf.c
blob09c43ae59a7d4715c26f13d72ca37bc759d1c76d
1 #include "cache.h"
2 #include "refs.h"
4 int prefixcmp(const char *str, const char *prefix)
6 for (; ; str++, prefix++)
7 if (!*prefix)
8 return 0;
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);
16 if (len < suflen)
17 return -1;
18 else
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
25 * initialized strbuf.
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;
33 if (hint) {
34 strbuf_grow(sb, hint);
35 sb->buf[0] = '\0';
39 void strbuf_release(struct strbuf *sb)
41 if (sb->alloc) {
42 free(sb->buf);
43 strbuf_init(sb, 0);
47 char *strbuf_detach(struct strbuf *sb, size_t *sz)
49 char *res = sb->alloc ? sb->buf : NULL;
50 if (sz)
51 *sz = sb->len;
52 strbuf_init(sb, 0);
53 return res;
56 void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
58 strbuf_release(sb);
59 sb->buf = buf;
60 sb->len = len;
61 sb->alloc = alloc;
62 strbuf_grow(sb, 0);
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");
71 if (!sb->alloc)
72 sb->buf = NULL;
73 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
76 void strbuf_trim(struct strbuf *sb)
78 char *b = sb->buf;
79 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
80 sb->len--;
81 while (sb->len > 0 && isspace(*b)) {
82 b++;
83 sb->len--;
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]))
91 sb->len--;
92 sb->buf[sb->len] = '\0';
95 void strbuf_ltrim(struct strbuf *sb)
97 char *b = sb->buf;
98 while (sb->len > 0 && isspace(*b)) {
99 b++;
100 sb->len--;
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;
109 char *n, *p;
110 struct strbuf **ret;
111 struct strbuf *t;
113 ret = xcalloc(alloc, sizeof(struct strbuf *));
114 p = n = sb->buf;
115 while (n < sb->buf + sb->len) {
116 int len;
117 n = memchr(n, delim, sb->len - (n - sb->buf));
118 if (pos + 1 >= alloc) {
119 alloc = alloc * 2;
120 ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
122 if (!n)
123 n = sb->buf + sb->len - 1;
124 len = n - p + 1;
125 t = xmalloc(sizeof(struct strbuf));
126 strbuf_init(t, len);
127 strbuf_add(t, p, len);
128 ret[pos] = t;
129 ret[++pos] = NULL;
130 p = ++n;
132 return ret;
135 void strbuf_list_free(struct strbuf **sbs)
137 struct strbuf **s = sbs;
139 while (*s) {
140 strbuf_release(*s);
141 free(*s++);
143 free(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);
150 if (cmp)
151 return cmp;
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");
160 if (pos > sb->len)
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");
165 if (dlen >= len)
166 strbuf_grow(sb, dlen - len);
167 memmove(sb->buf + pos + dlen,
168 sb->buf + pos + len,
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, ...)
200 va_list ap;
201 va_start(ap, fmt);
202 strbuf_vaddf(sb, fmt, ap);
203 va_end(ap);
206 void strbuf_vaddf(struct strbuf *sb, const char *fmt, va_list ap)
208 int len;
209 va_list cp;
211 if (!strbuf_avail(sb))
212 strbuf_grow(sb, 64);
213 va_copy(cp, ap);
214 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
215 va_end(cp);
216 if (len < 0)
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,
228 void *context)
230 for (;;) {
231 const char *percent;
232 size_t consumed;
234 percent = strchrnul(format, '%');
235 strbuf_add(sb, format, percent - format);
236 if (!*percent)
237 break;
238 format = percent + 1;
240 if (*format == '%') {
241 strbuf_addch(sb, '%');
242 format++;
243 continue;
246 consumed = fn(sb, format, context);
247 if (consumed)
248 format += consumed;
249 else
250 strbuf_addch(sb, '%');
254 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
255 void *context)
257 struct strbuf_expand_dict_entry *e = context;
258 size_t len;
260 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
261 if (!strncmp(placeholder, e->placeholder, len)) {
262 if (e->value)
263 strbuf_addstr(sb, e->value);
264 return len;
267 return 0;
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)
283 size_t res;
284 size_t oldalloc = sb->alloc;
286 strbuf_grow(sb, size);
287 res = fread(sb->buf + sb->len, 1, size, f);
288 if (res > 0)
289 strbuf_setlen(sb, sb->len + res);
290 else if (oldalloc == 0)
291 strbuf_release(sb);
292 return res;
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);
301 for (;;) {
302 ssize_t cnt;
304 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
305 if (cnt < 0) {
306 if (oldalloc == 0)
307 strbuf_release(sb);
308 else
309 strbuf_setlen(sb, oldlen);
310 return -1;
312 if (!cnt)
313 break;
314 sb->len += cnt;
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;
328 if (hint < 32)
329 hint = 32;
331 while (hint < STRBUF_MAXLINK) {
332 int len;
334 strbuf_grow(sb, hint);
335 len = readlink(path, sb->buf, hint);
336 if (len < 0) {
337 if (errno != ERANGE)
338 break;
339 } else if (len < hint) {
340 strbuf_setlen(sb, len);
341 return 0;
344 /* .. the buffer was too small - try again */
345 hint *= 2;
347 if (oldalloc == 0)
348 strbuf_release(sb);
349 return -1;
352 int strbuf_getwholeline(struct strbuf *sb, FILE *fp, int term)
354 int ch;
356 strbuf_grow(sb, 0);
357 if (feof(fp))
358 return EOF;
360 strbuf_reset(sb);
361 while ((ch = fgetc(fp)) != EOF) {
362 strbuf_grow(sb, 1);
363 sb->buf[sb->len++] = ch;
364 if (ch == term)
365 break;
367 if (ch == EOF && sb->len == 0)
368 return EOF;
370 sb->buf[sb->len] = '\0';
371 return 0;
374 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
376 if (strbuf_getwholeline(sb, fp, term))
377 return EOF;
378 if (sb->buf[sb->len-1] == term)
379 strbuf_setlen(sb, sb->len-1);
380 return 0;
383 int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
385 int fd, len;
387 fd = open(path, O_RDONLY);
388 if (fd < 0)
389 return -1;
390 len = strbuf_read(sb, fd, hint);
391 close(fd);
392 if (len < 0)
393 return -1;
395 return len;