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-rw-r--r--Documentation/perf_counter/strbuf.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/Documentation/perf_counter/strbuf.c b/Documentation/perf_counter/strbuf.c
new file mode 100644
index 000000000000..eaba09306802
--- /dev/null
+++ b/Documentation/perf_counter/strbuf.c
@@ -0,0 +1,359 @@
1#include "cache.h"
2
3int prefixcmp(const char *str, const char *prefix)
4{
5 for (; ; str++, prefix++)
6 if (!*prefix)
7 return 0;
8 else if (*str != *prefix)
9 return (unsigned char)*prefix - (unsigned char)*str;
10}
11
12/*
13 * Used as the default ->buf value, so that people can always assume
14 * buf is non NULL and ->buf is NUL terminated even for a freshly
15 * initialized strbuf.
16 */
17char strbuf_slopbuf[1];
18
19void strbuf_init(struct strbuf *sb, size_t hint)
20{
21 sb->alloc = sb->len = 0;
22 sb->buf = strbuf_slopbuf;
23 if (hint)
24 strbuf_grow(sb, hint);
25}
26
27void strbuf_release(struct strbuf *sb)
28{
29 if (sb->alloc) {
30 free(sb->buf);
31 strbuf_init(sb, 0);
32 }
33}
34
35char *strbuf_detach(struct strbuf *sb, size_t *sz)
36{
37 char *res = sb->alloc ? sb->buf : NULL;
38 if (sz)
39 *sz = sb->len;
40 strbuf_init(sb, 0);
41 return res;
42}
43
44void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
45{
46 strbuf_release(sb);
47 sb->buf = buf;
48 sb->len = len;
49 sb->alloc = alloc;
50 strbuf_grow(sb, 0);
51 sb->buf[sb->len] = '\0';
52}
53
54void strbuf_grow(struct strbuf *sb, size_t extra)
55{
56 if (sb->len + extra + 1 <= sb->len)
57 die("you want to use way too much memory");
58 if (!sb->alloc)
59 sb->buf = NULL;
60 ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
61}
62
63void strbuf_trim(struct strbuf *sb)
64{
65 char *b = sb->buf;
66 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
67 sb->len--;
68 while (sb->len > 0 && isspace(*b)) {
69 b++;
70 sb->len--;
71 }
72 memmove(sb->buf, b, sb->len);
73 sb->buf[sb->len] = '\0';
74}
75void strbuf_rtrim(struct strbuf *sb)
76{
77 while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
78 sb->len--;
79 sb->buf[sb->len] = '\0';
80}
81
82void strbuf_ltrim(struct strbuf *sb)
83{
84 char *b = sb->buf;
85 while (sb->len > 0 && isspace(*b)) {
86 b++;
87 sb->len--;
88 }
89 memmove(sb->buf, b, sb->len);
90 sb->buf[sb->len] = '\0';
91}
92
93void strbuf_tolower(struct strbuf *sb)
94{
95 int i;
96 for (i = 0; i < sb->len; i++)
97 sb->buf[i] = tolower(sb->buf[i]);
98}
99
100struct strbuf **strbuf_split(const struct strbuf *sb, int delim)
101{
102 int alloc = 2, pos = 0;
103 char *n, *p;
104 struct strbuf **ret;
105 struct strbuf *t;
106
107 ret = calloc(alloc, sizeof(struct strbuf *));
108 p = n = sb->buf;
109 while (n < sb->buf + sb->len) {
110 int len;
111 n = memchr(n, delim, sb->len - (n - sb->buf));
112 if (pos + 1 >= alloc) {
113 alloc = alloc * 2;
114 ret = realloc(ret, sizeof(struct strbuf *) * alloc);
115 }
116 if (!n)
117 n = sb->buf + sb->len - 1;
118 len = n - p + 1;
119 t = malloc(sizeof(struct strbuf));
120 strbuf_init(t, len);
121 strbuf_add(t, p, len);
122 ret[pos] = t;
123 ret[++pos] = NULL;
124 p = ++n;
125 }
126 return ret;
127}
128
129void strbuf_list_free(struct strbuf **sbs)
130{
131 struct strbuf **s = sbs;
132
133 while (*s) {
134 strbuf_release(*s);
135 free(*s++);
136 }
137 free(sbs);
138}
139
140int strbuf_cmp(const struct strbuf *a, const struct strbuf *b)
141{
142 int len = a->len < b->len ? a->len: b->len;
143 int cmp = memcmp(a->buf, b->buf, len);
144 if (cmp)
145 return cmp;
146 return a->len < b->len ? -1: a->len != b->len;
147}
148
149void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
150 const void *data, size_t dlen)
151{
152 if (pos + len < pos)
153 die("you want to use way too much memory");
154 if (pos > sb->len)
155 die("`pos' is too far after the end of the buffer");
156 if (pos + len > sb->len)
157 die("`pos + len' is too far after the end of the buffer");
158
159 if (dlen >= len)
160 strbuf_grow(sb, dlen - len);
161 memmove(sb->buf + pos + dlen,
162 sb->buf + pos + len,
163 sb->len - pos - len);
164 memcpy(sb->buf + pos, data, dlen);
165 strbuf_setlen(sb, sb->len + dlen - len);
166}
167
168void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
169{
170 strbuf_splice(sb, pos, 0, data, len);
171}
172
173void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
174{
175 strbuf_splice(sb, pos, len, NULL, 0);
176}
177
178void strbuf_add(struct strbuf *sb, const void *data, size_t len)
179{
180 strbuf_grow(sb, len);
181 memcpy(sb->buf + sb->len, data, len);
182 strbuf_setlen(sb, sb->len + len);
183}
184
185void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
186{
187 strbuf_grow(sb, len);
188 memcpy(sb->buf + sb->len, sb->buf + pos, len);
189 strbuf_setlen(sb, sb->len + len);
190}
191
192void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
193{
194 int len;
195 va_list ap;
196
197 if (!strbuf_avail(sb))
198 strbuf_grow(sb, 64);
199 va_start(ap, fmt);
200 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
201 va_end(ap);
202 if (len < 0)
203 die("your vsnprintf is broken");
204 if (len > strbuf_avail(sb)) {
205 strbuf_grow(sb, len);
206 va_start(ap, fmt);
207 len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
208 va_end(ap);
209 if (len > strbuf_avail(sb)) {
210 die("this should not happen, your snprintf is broken");
211 }
212 }
213 strbuf_setlen(sb, sb->len + len);
214}
215
216void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
217 void *context)
218{
219 for (;;) {
220 const char *percent;
221 size_t consumed;
222
223 percent = strchrnul(format, '%');
224 strbuf_add(sb, format, percent - format);
225 if (!*percent)
226 break;
227 format = percent + 1;
228
229 consumed = fn(sb, format, context);
230 if (consumed)
231 format += consumed;
232 else
233 strbuf_addch(sb, '%');
234 }
235}
236
237size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
238 void *context)
239{
240 struct strbuf_expand_dict_entry *e = context;
241 size_t len;
242
243 for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
244 if (!strncmp(placeholder, e->placeholder, len)) {
245 if (e->value)
246 strbuf_addstr(sb, e->value);
247 return len;
248 }
249 }
250 return 0;
251}
252
253size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
254{
255 size_t res;
256 size_t oldalloc = sb->alloc;
257
258 strbuf_grow(sb, size);
259 res = fread(sb->buf + sb->len, 1, size, f);
260 if (res > 0)
261 strbuf_setlen(sb, sb->len + res);
262 else if (res < 0 && oldalloc == 0)
263 strbuf_release(sb);
264 return res;
265}
266
267ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
268{
269 size_t oldlen = sb->len;
270 size_t oldalloc = sb->alloc;
271
272 strbuf_grow(sb, hint ? hint : 8192);
273 for (;;) {
274 ssize_t cnt;
275
276 cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
277 if (cnt < 0) {
278 if (oldalloc == 0)
279 strbuf_release(sb);
280 else
281 strbuf_setlen(sb, oldlen);
282 return -1;
283 }
284 if (!cnt)
285 break;
286 sb->len += cnt;
287 strbuf_grow(sb, 8192);
288 }
289
290 sb->buf[sb->len] = '\0';
291 return sb->len - oldlen;
292}
293
294#define STRBUF_MAXLINK (2*PATH_MAX)
295
296int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
297{
298 size_t oldalloc = sb->alloc;
299
300 if (hint < 32)
301 hint = 32;
302
303 while (hint < STRBUF_MAXLINK) {
304 int len;
305
306 strbuf_grow(sb, hint);
307 len = readlink(path, sb->buf, hint);
308 if (len < 0) {
309 if (errno != ERANGE)
310 break;
311 } else if (len < hint) {
312 strbuf_setlen(sb, len);
313 return 0;
314 }
315
316 /* .. the buffer was too small - try again */
317 hint *= 2;
318 }
319 if (oldalloc == 0)
320 strbuf_release(sb);
321 return -1;
322}
323
324int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
325{
326 int ch;
327
328 strbuf_grow(sb, 0);
329 if (feof(fp))
330 return EOF;
331
332 strbuf_reset(sb);
333 while ((ch = fgetc(fp)) != EOF) {
334 if (ch == term)
335 break;
336 strbuf_grow(sb, 1);
337 sb->buf[sb->len++] = ch;
338 }
339 if (ch == EOF && sb->len == 0)
340 return EOF;
341
342 sb->buf[sb->len] = '\0';
343 return 0;
344}
345
346int strbuf_read_file(struct strbuf *sb, const char *path, size_t hint)
347{
348 int fd, len;
349
350 fd = open(path, O_RDONLY);
351 if (fd < 0)
352 return -1;
353 len = strbuf_read(sb, fd, hint);
354 close(fd);
355 if (len < 0)
356 return -1;
357
358 return len;
359}
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