2 #include "linux/string.h"
7 * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
8 * and return its numeric value
10 s64 perf_atoll(const char *str)
19 length = strtoll(str, &p, 10);
28 /* two-letter suffices */
42 /* we want the cases to match */
44 if (strcmp(p, "b") != 0)
47 if (strcmp(p, "B") != 0)
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))
68 static const char *skip_arg(const char *cp)
70 while (*cp && !isspace(*cp))
76 static int count_argc(const char *str)
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)
100 for (p = argv; *p; p++)
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
118 char **argv_split(const char *str, int *argcp)
120 int argc = count_argc(str);
121 char **argv = zalloc(sizeof(*argv) * (argc+1));
141 t = strndup(p, str-p);
157 /* Character class matching */
158 static bool __match_charclass(const char *pat, char c, const char **npat)
160 bool complement = false, ret = true;
166 if (*pat++ == c) /* First character is special */
169 while (*pat && *pat != ']') { /* Matching */
170 if (*pat == '-' && *(pat + 1) != ']') { /* Range */
171 if (*(pat - 1) <= c && c <= *(pat + 1))
173 if (*(pat - 1) > *(pat + 1))
176 } else if (*pat++ == c)
184 while (*pat && *pat != ']') /* Searching closing */
189 return complement ? !ret : ret;
195 /* Glob/lazy pattern matching */
196 static bool __match_glob(const char *str, const char *pat, bool ignore_space)
198 while (*str && *pat && *pat != '*') {
200 /* Ignore spaces for lazy matching */
210 if (*pat == '?') { /* Matches any single character */
214 } else if (*pat == '[') /* Character classes/Ranges */
215 if (__match_charclass(pat + 1, *str, &pat)) {
220 else if (*pat == '\\') /* Escaped char match as normal char */
222 if (*str++ != *pat++)
225 /* Check wild card */
229 if (!*pat) /* Tail wild card matches all */
232 if (__match_glob(str++, pat, ignore_space))
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
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)
279 while (--i1 >= 0 && --i2 >= 0) {
280 if (s1[i1] != s2[i2])
281 return s1[i1] - s2[i2];
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)
298 while ((p = strchr(p, from)) != NULL)
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.
314 while (len && isspace(*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.
331 size_t size = strlen(s);
338 while (end >= s && isspace(*end))
346 * memdup - duplicate region of memory
347 * @src: memory region to duplicate
348 * @len: memory region length
350 void *memdup(const void *src, size_t len)
361 char *asprintf_expr_inout_ints(const char *var, bool in, size_t nints, int *ints)
364 * FIXME: replace this with an expression using log10() when we
365 * find a suitable implementation, maybe the one in the dvb drivers...
367 * "%s == %d || " = log10(MAXINT) * 2 + 8 chars for the operators
369 size_t size = nints * 28 + 1; /* \0 */
370 size_t i, printed = 0;
371 char *expr = malloc(size);
374 const char *or_and = "||", *eq_neq = "==";
382 for (i = 0; i < nints; ++i) {
384 goto out_err_overflow;
387 printed += snprintf(e + printed, size - printed, " %s ", or_and);
388 printed += scnprintf(e + printed, size - printed,
389 "%s %s %d", var, eq_neq, ints[i]);