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[linux/fpc-iii.git] / tools / perf / util / string.c
blob7f7e072be746f5985eb3c9ae5e84ad3ce9115b61
1 #include "util.h"
2 #include "linux/string.h"
4 #define K 1024LL
5 /*
6 * perf_atoll()
7 * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
8 * and return its numeric value
9 */
10 s64 perf_atoll(const char *str)
12 s64 length;
13 char *p;
14 char c;
16 if (!isdigit(str[0]))
17 goto out_err;
19 length = strtoll(str, &p, 10);
20 switch (c = *p++) {
21 case 'b': case 'B':
22 if (*p)
23 goto out_err;
24 case '\0':
25 return length;
26 default:
27 goto out_err;
28 /* two-letter suffices */
29 case 'k': case 'K':
30 length <<= 10;
31 break;
32 case 'm': case 'M':
33 length <<= 20;
34 break;
35 case 'g': case 'G':
36 length <<= 30;
37 break;
38 case 't': case 'T':
39 length <<= 40;
40 break;
42 /* we want the cases to match */
43 if (islower(c)) {
44 if (strcmp(p, "b") != 0)
45 goto out_err;
46 } else {
47 if (strcmp(p, "B") != 0)
48 goto out_err;
50 return length;
52 out_err:
53 return -1;
57 * Helper function for splitting a string into an argv-like array.
58 * originally copied from lib/argv_split.c
60 static const char *skip_sep(const char *cp)
62 while (*cp && isspace(*cp))
63 cp++;
65 return cp;
68 static const char *skip_arg(const char *cp)
70 while (*cp && !isspace(*cp))
71 cp++;
73 return cp;
76 static int count_argc(const char *str)
78 int count = 0;
80 while (*str) {
81 str = skip_sep(str);
82 if (*str) {
83 count++;
84 str = skip_arg(str);
88 return count;
91 /**
92 * argv_free - free an argv
93 * @argv - the argument vector to be freed
95 * Frees an argv and the strings it points to.
97 void argv_free(char **argv)
99 char **p;
100 for (p = argv; *p; p++)
101 zfree(p);
103 free(argv);
107 * argv_split - split a string at whitespace, returning an argv
108 * @str: the string to be split
109 * @argcp: returned argument count
111 * Returns an array of pointers to strings which are split out from
112 * @str. This is performed by strictly splitting on white-space; no
113 * quote processing is performed. Multiple whitespace characters are
114 * considered to be a single argument separator. The returned array
115 * is always NULL-terminated. Returns NULL on memory allocation
116 * failure.
118 char **argv_split(const char *str, int *argcp)
120 int argc = count_argc(str);
121 char **argv = zalloc(sizeof(*argv) * (argc+1));
122 char **argvp;
124 if (argv == NULL)
125 goto out;
127 if (argcp)
128 *argcp = argc;
130 argvp = argv;
132 while (*str) {
133 str = skip_sep(str);
135 if (*str) {
136 const char *p = str;
137 char *t;
139 str = skip_arg(str);
141 t = strndup(p, str-p);
142 if (t == NULL)
143 goto fail;
144 *argvp++ = t;
147 *argvp = NULL;
149 out:
150 return argv;
152 fail:
153 argv_free(argv);
154 return NULL;
157 /* Character class matching */
158 static bool __match_charclass(const char *pat, char c, const char **npat)
160 bool complement = false, ret = true;
162 if (*pat == '!') {
163 complement = true;
164 pat++;
166 if (*pat++ == c) /* First character is special */
167 goto end;
169 while (*pat && *pat != ']') { /* Matching */
170 if (*pat == '-' && *(pat + 1) != ']') { /* Range */
171 if (*(pat - 1) <= c && c <= *(pat + 1))
172 goto end;
173 if (*(pat - 1) > *(pat + 1))
174 goto error;
175 pat += 2;
176 } else if (*pat++ == c)
177 goto end;
179 if (!*pat)
180 goto error;
181 ret = false;
183 end:
184 while (*pat && *pat != ']') /* Searching closing */
185 pat++;
186 if (!*pat)
187 goto error;
188 *npat = pat + 1;
189 return complement ? !ret : ret;
191 error:
192 return false;
195 /* Glob/lazy pattern matching */
196 static bool __match_glob(const char *str, const char *pat, bool ignore_space)
198 while (*str && *pat && *pat != '*') {
199 if (ignore_space) {
200 /* Ignore spaces for lazy matching */
201 if (isspace(*str)) {
202 str++;
203 continue;
205 if (isspace(*pat)) {
206 pat++;
207 continue;
210 if (*pat == '?') { /* Matches any single character */
211 str++;
212 pat++;
213 continue;
214 } else if (*pat == '[') /* Character classes/Ranges */
215 if (__match_charclass(pat + 1, *str, &pat)) {
216 str++;
217 continue;
218 } else
219 return false;
220 else if (*pat == '\\') /* Escaped char match as normal char */
221 pat++;
222 if (*str++ != *pat++)
223 return false;
225 /* Check wild card */
226 if (*pat == '*') {
227 while (*pat == '*')
228 pat++;
229 if (!*pat) /* Tail wild card matches all */
230 return true;
231 while (*str)
232 if (__match_glob(str++, pat, ignore_space))
233 return true;
235 return !*str && !*pat;
239 * strglobmatch - glob expression pattern matching
240 * @str: the target string to match
241 * @pat: the pattern string to match
243 * This returns true if the @str matches @pat. @pat can includes wildcards
244 * ('*','?') and character classes ([CHARS], complementation and ranges are
245 * also supported). Also, this supports escape character ('\') to use special
246 * characters as normal character.
248 * Note: if @pat syntax is broken, this always returns false.
250 bool strglobmatch(const char *str, const char *pat)
252 return __match_glob(str, pat, false);
256 * strlazymatch - matching pattern strings lazily with glob pattern
257 * @str: the target string to match
258 * @pat: the pattern string to match
260 * This is similar to strglobmatch, except this ignores spaces in
261 * the target string.
263 bool strlazymatch(const char *str, const char *pat)
265 return __match_glob(str, pat, true);
269 * strtailcmp - Compare the tail of two strings
270 * @s1: 1st string to be compared
271 * @s2: 2nd string to be compared
273 * Return 0 if whole of either string is same as another's tail part.
275 int strtailcmp(const char *s1, const char *s2)
277 int i1 = strlen(s1);
278 int i2 = strlen(s2);
279 while (--i1 >= 0 && --i2 >= 0) {
280 if (s1[i1] != s2[i2])
281 return s1[i1] - s2[i2];
283 return 0;
287 * strxfrchar - Locate and replace character in @s
288 * @s: The string to be searched/changed.
289 * @from: Source character to be replaced.
290 * @to: Destination character.
292 * Return pointer to the changed string.
294 char *strxfrchar(char *s, char from, char to)
296 char *p = s;
298 while ((p = strchr(p, from)) != NULL)
299 *p++ = to;
301 return s;
305 * ltrim - Removes leading whitespace from @s.
306 * @s: The string to be stripped.
308 * Return pointer to the first non-whitespace character in @s.
310 char *ltrim(char *s)
312 int len = strlen(s);
314 while (len && isspace(*s)) {
315 len--;
316 s++;
319 return s;
323 * rtrim - Removes trailing whitespace from @s.
324 * @s: The string to be stripped.
326 * Note that the first trailing whitespace is replaced with a %NUL-terminator
327 * in the given string @s. Returns @s.
329 char *rtrim(char *s)
331 size_t size = strlen(s);
332 char *end;
334 if (!size)
335 return s;
337 end = s + size - 1;
338 while (end >= s && isspace(*end))
339 end--;
340 *(end + 1) = '\0';
342 return s;
345 char *asprintf_expr_inout_ints(const char *var, bool in, size_t nints, int *ints)
348 * FIXME: replace this with an expression using log10() when we
349 * find a suitable implementation, maybe the one in the dvb drivers...
351 * "%s == %d || " = log10(MAXINT) * 2 + 8 chars for the operators
353 size_t size = nints * 28 + 1; /* \0 */
354 size_t i, printed = 0;
355 char *expr = malloc(size);
357 if (expr) {
358 const char *or_and = "||", *eq_neq = "==";
359 char *e = expr;
361 if (!in) {
362 or_and = "&&";
363 eq_neq = "!=";
366 for (i = 0; i < nints; ++i) {
367 if (printed == size)
368 goto out_err_overflow;
370 if (i > 0)
371 printed += snprintf(e + printed, size - printed, " %s ", or_and);
372 printed += scnprintf(e + printed, size - printed,
373 "%s %s %d", var, eq_neq, ints[i]);
377 return expr;
379 out_err_overflow:
380 free(expr);
381 return NULL;