1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/kernel.h>
4 #include <linux/string.h>
7 #include <linux/ctype.h>
9 const char *graph_dotted_line =
10 "---------------------------------------------------------------------"
11 "---------------------------------------------------------------------"
12 "---------------------------------------------------------------------";
14 "....................................................................."
15 "....................................................................."
16 ".....................................................................";
20 * Parse (\d+)(b|B|kb|KB|mb|MB|gb|GB|tb|TB) (e.g. "256MB")
21 * and return its numeric value
23 s64 perf_atoll(const char *str)
32 length = strtoll(str, &p, 10);
43 /* two-letter suffices */
57 /* we want the cases to match */
59 if (strcmp(p, "b") != 0)
62 if (strcmp(p, "B") != 0)
71 /* Character class matching */
72 static bool __match_charclass(const char *pat, char c, const char **npat)
74 bool complement = false, ret = true;
80 if (*pat++ == c) /* First character is special */
83 while (*pat && *pat != ']') { /* Matching */
84 if (*pat == '-' && *(pat + 1) != ']') { /* Range */
85 if (*(pat - 1) <= c && c <= *(pat + 1))
87 if (*(pat - 1) > *(pat + 1))
90 } else if (*pat++ == c)
98 while (*pat && *pat != ']') /* Searching closing */
103 return complement ? !ret : ret;
109 /* Glob/lazy pattern matching */
110 static bool __match_glob(const char *str, const char *pat, bool ignore_space,
113 while (*str && *pat && *pat != '*') {
115 /* Ignore spaces for lazy matching */
125 if (*pat == '?') { /* Matches any single character */
129 } else if (*pat == '[') /* Character classes/Ranges */
130 if (__match_charclass(pat + 1, *str, &pat)) {
135 else if (*pat == '\\') /* Escaped char match as normal char */
138 if (tolower(*str) != tolower(*pat))
140 } else if (*str != *pat)
145 /* Check wild card */
149 if (!*pat) /* Tail wild card matches all */
152 if (__match_glob(str++, pat, ignore_space, case_ins))
155 return !*str && !*pat;
159 * strglobmatch - glob expression pattern matching
160 * @str: the target string to match
161 * @pat: the pattern string to match
163 * This returns true if the @str matches @pat. @pat can includes wildcards
164 * ('*','?') and character classes ([CHARS], complementation and ranges are
165 * also supported). Also, this supports escape character ('\') to use special
166 * characters as normal character.
168 * Note: if @pat syntax is broken, this always returns false.
170 bool strglobmatch(const char *str, const char *pat)
172 return __match_glob(str, pat, false, false);
175 bool strglobmatch_nocase(const char *str, const char *pat)
177 return __match_glob(str, pat, false, true);
181 * strlazymatch - matching pattern strings lazily with glob pattern
182 * @str: the target string to match
183 * @pat: the pattern string to match
185 * This is similar to strglobmatch, except this ignores spaces in
188 bool strlazymatch(const char *str, const char *pat)
190 return __match_glob(str, pat, true, false);
194 * strtailcmp - Compare the tail of two strings
195 * @s1: 1st string to be compared
196 * @s2: 2nd string to be compared
198 * Return 0 if whole of either string is same as another's tail part.
200 int strtailcmp(const char *s1, const char *s2)
204 while (--i1 >= 0 && --i2 >= 0) {
205 if (s1[i1] != s2[i2])
206 return s1[i1] - s2[i2];
211 char *asprintf_expr_inout_ints(const char *var, bool in, size_t nints, int *ints)
214 * FIXME: replace this with an expression using log10() when we
215 * find a suitable implementation, maybe the one in the dvb drivers...
217 * "%s == %d || " = log10(MAXINT) * 2 + 8 chars for the operators
219 size_t size = nints * 28 + 1; /* \0 */
220 size_t i, printed = 0;
221 char *expr = malloc(size);
224 const char *or_and = "||", *eq_neq = "==";
232 for (i = 0; i < nints; ++i) {
234 goto out_err_overflow;
237 printed += scnprintf(e + printed, size - printed, " %s ", or_and);
238 printed += scnprintf(e + printed, size - printed,
239 "%s %s %d", var, eq_neq, ints[i]);
250 /* Like strpbrk(), but not break if it is right after a backslash (escaped) */
251 char *strpbrk_esc(char *str, const char *stopset)
256 ptr = strpbrk(str, stopset);
258 (ptr == str + 1 && *(ptr - 1) != '\\'))
261 } while (ptr && *(ptr - 1) == '\\' && *(ptr - 2) != '\\');
266 /* Like strdup, but do not copy a single backslash */
267 char *strdup_esc(const char *str)
269 char *s, *d, *p, *ret = strdup(str);
274 d = strchr(ret, '\\');
284 p = strchr(s + 1, '\\');
286 memmove(d, s, p - s);
290 memmove(d, s, strlen(s) + 1);
296 unsigned int hex(char c)
298 if (c >= '0' && c <= '9')
300 if (c >= 'a' && c <= 'f')
306 * Replace all occurrences of character 'needle' in string 'haystack' with
309 * The new string could be longer so a new string is returned which must be
312 char *strreplace_chars(char needle, const char *haystack, const char *replace)
314 int replace_len = strlen(replace);
316 const char *loc = strchr(haystack, needle);
317 const char *from = haystack;
320 /* Count occurrences */
322 loc = strchr(loc + 1, needle);
326 /* Allocate enough space for replacements and reset first location */
327 new_s = malloc(strlen(haystack) + (num * (replace_len - 1) + 1));
330 loc = strchr(haystack, needle);
334 /* Copy original string up to found char and update positions */
335 memcpy(to, from, 1 + loc - from);
339 /* Copy replacement string and update positions */
340 memcpy(to, replace, replace_len);
343 /* needle next occurrence or end of string */
344 loc = strchr(from, needle);
347 /* Copy any remaining chars + null */