lib/parser.c: add match_wildcard() function
match_wildcard function is a simple implementation of wildcard matching algorithm. It only supports two usual wildcardes: '*' - matches zero or more characters '?' - matches one character This algorithm is safe since it is non-recursive. Signed-off-by: Du, Changbin <changbin.du@gmail.com> Cc: Jason Baron <jbaron@akamai.com> Cc: Joe Perches <joe@perches.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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2 changed files with 52 additions and 0 deletions
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@ -29,5 +29,6 @@ int match_token(char *, const match_table_t table, substring_t args[]);
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int match_int(substring_t *, int *result);
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int match_octal(substring_t *, int *result);
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int match_hex(substring_t *, int *result);
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bool match_wildcard(const char *pattern, const char *str);
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size_t match_strlcpy(char *, const substring_t *, size_t);
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char *match_strdup(const substring_t *);
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51
lib/parser.c
51
lib/parser.c
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@ -192,6 +192,56 @@ int match_hex(substring_t *s, int *result)
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return match_number(s, result, 16);
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}
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/**
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* match_wildcard: - parse if a string matches given wildcard pattern
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* @pattern: wildcard pattern
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* @str: the string to be parsed
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*
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* Description: Parse the string @str to check if matches wildcard
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* pattern @pattern. The pattern may contain two type wildcardes:
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* '*' - matches zero or more characters
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* '?' - matches one character
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* If it's matched, return true, else return false.
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*/
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bool match_wildcard(const char *pattern, const char *str)
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{
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const char *s = str;
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const char *p = pattern;
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bool star = false;
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while (*s) {
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switch (*p) {
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case '?':
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s++;
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p++;
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break;
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case '*':
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star = true;
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str = s;
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if (!*++p)
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return true;
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pattern = p;
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break;
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default:
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if (*s == *p) {
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s++;
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p++;
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} else {
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if (!star)
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return false;
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str++;
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s = str;
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p = pattern;
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}
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break;
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}
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}
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if (*p == '*')
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++p;
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return !*p;
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}
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/**
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* match_strlcpy: - Copy the characters from a substring_t to a sized buffer
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* @dest: where to copy to
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@ -235,5 +285,6 @@ EXPORT_SYMBOL(match_token);
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EXPORT_SYMBOL(match_int);
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EXPORT_SYMBOL(match_octal);
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EXPORT_SYMBOL(match_hex);
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EXPORT_SYMBOL(match_wildcard);
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EXPORT_SYMBOL(match_strlcpy);
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EXPORT_SYMBOL(match_strdup);
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