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-rw-r--r--libbb/strbuf.c376
1 files changed, 376 insertions, 0 deletions
diff --git a/libbb/strbuf.c b/libbb/strbuf.c
new file mode 100644
index 000000000..a88496030
--- /dev/null
+++ b/libbb/strbuf.c
@@ -0,0 +1,376 @@
1#include "cache.h"
2#include "refs.h"
3
4int prefixcmp(const char *str, const char *prefix)
5{
6 for (; ; str++, prefix++)
7 if (!*prefix)
8 return 0;
9 else if (*str != *prefix)
10 return (unsigned char)*prefix - (unsigned char)*str;
11}
12
13/*
14 * Used as the default ->buf value, so that people can always assume
15 * buf is non NULL and ->buf is NUL terminated even for a freshly
16 * initialized strbuf.
17 */
18char strbuf_slopbuf[1];
19
20void strbuf_init(struct strbuf *sb, size_t hint)
21{
22 sb->alloc = sb->len = 0;
23 sb->buf = strbuf_slopbuf;
24 if (hint)
25 strbuf_grow(sb, hint);
26}
27
28void strbuf_release(struct strbuf *sb)
29{
30 if (sb->alloc) {
31 free(sb->buf);
32 strbuf_init(sb, 0);
33 }
34}
35
36char *strbuf_detach(struct strbuf *sb, size_t *sz)
37{
38 char *res = sb->alloc ? sb->buf : NULL;
39 if (sz)
40 *sz = sb->len;
41 strbuf_init(sb, 0);
42 return res;
43}
44
45void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
46{
47 strbuf_release(sb);
48 sb->buf = buf;
49 sb->len = len;
50 sb->alloc = alloc;
51 strbuf_grow(sb, 0);
52 sb->buf[sb->len] = '\0';
53}
54
55void strbuf_grow(struct strbuf *sb, size_t extra)
56{
57 if (sb->len + extra + 1 <= sb->len)
58 die("you want to use way too much memory");
59 if (!sb->alloc)
60 sb->buf = NULL;
61 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
62}
63
64void strbuf_trim(struct strbuf *sb)
65{
66 char *b = sb->buf;
67 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
68 sb->len--;
69 while (sb->len > 0 && isspace(*b)) {
70 b++;
71 sb->len--;
72 }
73 memmove(sb->buf, b, sb->len);
74 sb->buf[sb->len] = '\0';
75}
76void strbuf_rtrim(struct strbuf *sb)
77{
78 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
79 sb->len--;
80 sb->buf[sb->len] = '\0';
81}
82
83void strbuf_ltrim(struct strbuf *sb)
84{
85 char *b = sb->buf;
86 while (sb->len > 0 && isspace(*b)) {
87 b++;
88 sb->len--;
89 }
90 memmove(sb->buf, b, sb->len);
91 sb->buf[sb->len] = '\0';
92}
93
94void strbuf_tolower(struct strbuf *sb)
95{
96 int i;
97 for (i = 0; i < sb->len; i++)
98 sb->buf[i] = tolower(sb->buf[i]);
99}
100
101struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
102{
103 int alloc = 2, pos = 0;
104 char *n, *p;
105 struct strbuf **ret;
106 struct strbuf *t;
107
108 ret = xcalloc(alloc, sizeof(struct strbuf *));
109 p = n = sb->buf;
110 while (n < sb->buf + sb->len) {
111 int len;
112 n = memchr(n, delim, sb->len - (n - sb->buf));
113 if (pos + 1 >= alloc) {
114 alloc = alloc * 2;
115 ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
116 }
117 if (!n)
118 n = sb->buf + sb->len - 1;
119 len = n - p + 1;
120 t = xmalloc(sizeof(struct strbuf));
121 strbuf_init(t, len);
122 strbuf_add(t, p, len);
123 ret[pos] = t;
124 ret[++pos] = NULL;
125 p = ++n;
126 }
127 return ret;
128}
129
130void strbuf_list_free(struct strbuf **sbs)
131{
132 struct strbuf **s = sbs;
133
134 while (*s) {
135 strbuf_release(*s);
136 free(*s++);
137 }
138 free(sbs);
139}
140
141int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
142{
143 int len = a->len < b->len ? a->len: b->len;
144 int cmp = memcmp(a->buf, b->buf, len);
145 if (cmp)
146 return cmp;
147 return a->len < b->len ? -1: a->len != b->len;
148}
149
150void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
151 const void *data, size_t dlen)
152{
153 if (pos + len < pos)
154 die("you want to use way too much memory");
155 if (pos > sb->len)
156 die("`pos' is too far after the end of the buffer");
157 if (pos + len > sb->len)
158 die("`pos + len' is too far after the end of the buffer");
159
160 if (dlen >= len)
161 strbuf_grow(sb, dlen - len);
162 memmove(sb->buf + pos + dlen,
163 sb->buf + pos + len,
164 sb->len - pos - len);
165 memcpy(sb->buf + pos, data, dlen);
166 strbuf_setlen(sb, sb->len + dlen - len);
167}
168
169void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
170{
171 strbuf_splice(sb, pos, 0, data, len);
172}
173
174void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
175{
176 strbuf_splice(sb, pos, len, NULL, 0);
177}
178
179void strbuf_add(struct strbuf *sb, const void *data, size_t len)
180{
181 strbuf_grow(sb, len);
182 memcpy(sb->buf + sb->len, data, len);
183 strbuf_setlen(sb, sb->len + len);
184}
185
186void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
187{
188 strbuf_grow(sb, len);
189 memcpy(sb->buf + sb->len, sb->buf + pos, len);
190 strbuf_setlen(sb, sb->len + len);
191}
192
193void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
194{
195 int len;
196 va_list ap;
197
198 if (!strbuf_avail(sb))
199 strbuf_grow(sb, 64);
200 va_start(ap, fmt);
201 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
202 va_end(ap);
203 if (len < 0)
204 die("your vsnprintf is broken");
205 if (len > strbuf_avail(sb)) {
206 strbuf_grow(sb, len);
207 va_start(ap, fmt);
208 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
209 va_end(ap);
210 if (len > strbuf_avail(sb)) {
211 die("this should not happen, your snprintf is broken");
212 }
213 }
214 strbuf_setlen(sb, sb->len + len);
215}
216
217void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
218 void *context)
219{
220 for (;;) {
221 const char *percent;
222 size_t consumed;
223
224 percent = strchrnul(format, '%');
225 strbuf_add(sb, format, percent - format);
226 if (!*percent)
227 break;
228 format = percent + 1;
229
230 consumed = fn(sb, format, context);
231 if (consumed)
232 format += consumed;
233 else
234 strbuf_addch(sb, '%');
235 }
236}
237
238size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
239 void *context)
240{
241 struct strbuf_expand_dict_entry *e = context;
242 size_t len;
243
244 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
245 if (!strncmp(placeholder, e->placeholder, len)) {
246 if (e->value)
247 strbuf_addstr(sb, e->value);
248 return len;
249 }
250 }
251 return 0;
252}
253
254size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
255{
256 size_t res;
257 size_t oldalloc = sb->alloc;
258
259 strbuf_grow(sb, size);
260 res = fread(sb->buf + sb->len, 1, size, f);
261 if (res > 0)
262 strbuf_setlen(sb, sb->len + res);
263 else if (res < 0 && oldalloc == 0)
264 strbuf_release(sb);
265 return res;
266}
267
268ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
269{
270 size_t oldlen = sb->len;
271 size_t oldalloc = sb->alloc;
272
273 strbuf_grow(sb, hint ? hint : 8192);
274 for (;;) {
275 ssize_t cnt;
276
277 cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
278 if (cnt < 0) {
279 if (oldalloc == 0)
280 strbuf_release(sb);
281 else
282 strbuf_setlen(sb, oldlen);
283 return -1;
284 }
285 if (!cnt)
286 break;
287 sb->len += cnt;
288 strbuf_grow(sb, 8192);
289 }
290
291 sb->buf[sb->len] = '\0';
292 return sb->len - oldlen;
293}
294
295#define STRBUF_MAXLINK (2*PATH_MAX)
296
297int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
298{
299 size_t oldalloc = sb->alloc;
300
301 if (hint < 32)
302 hint = 32;
303
304 while (hint < STRBUF_MAXLINK) {
305 int len;
306
307 strbuf_grow(sb, hint);
308 len = readlink(path, sb->buf, hint);
309 if (len < 0) {
310 if (errno != ERANGE)
311 break;
312 } else if (len < hint) {
313 strbuf_setlen(sb, len);
314 return 0;
315 }
316
317 /* .. the buffer was too small - try again */
318 hint *= 2;
319 }
320 if (oldalloc == 0)
321 strbuf_release(sb);
322 return -1;
323}
324
325int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
326{
327 int ch;
328
329 strbuf_grow(sb, 0);
330 if (feof(fp))
331 return EOF;
332
333 strbuf_reset(sb);
334 while ((ch = fgetc(fp)) != EOF) {
335 if (ch == term)
336 break;
337 strbuf_grow(sb, 1);
338 sb->buf[sb->len++] = ch;
339 }
340 if (ch == EOF && sb->len == 0)
341 return EOF;
342
343 sb->buf[sb->len] = '\0';
344 return 0;
345}
346
347int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
348{
349 int fd, len;
350
351 fd = open(path, O_RDONLY);
352 if (fd < 0)
353 return -1;
354 len = strbuf_read(sb, fd, hint);
355 close(fd);
356 if (len < 0)
357 return -1;
358
359 return len;
360}
361
362int strbuf_branchname(struct strbuf *sb, const char *name)
363{
364 int len = strlen(name);
365 if (interpret_branch_name(name, sb) == len)
366 return 0;
367 strbuf_add(sb, name, len);
368 return len;
369}
370
371int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
372{
373 strbuf_branchname(sb, name);
374 strbuf_splice(sb, 0, 0, "refs/heads/", 11);
375 return check_ref_format(sb->buf);
376}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-28 07:25:15 +0000