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Subject[PATCH -tip 7/8] perf tools: Enhance glob string matching
Date
Enhance strglobmatch() for supporting character classes([CHARS],
complementation and ranges are also supported) and escaped special
characters (\*, \? etc).

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
---
tools/perf/util/string.c | 65 +++++++++++++++++++++++++++++++++++++++++++---
1 files changed, 61 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/string.c b/tools/perf/util/string.c
index 5352d7d..c397d4f 100644
--- a/tools/perf/util/string.c
+++ b/tools/perf/util/string.c
@@ -227,16 +227,73 @@ fail:
return NULL;
}

-/* Glob expression pattern matching */
+/* Character class matching */
+static bool __match_charclass(const char *pat, char c, const char **npat)
+{
+ bool complement = false, ret = true;
+
+ if (*pat == '!') {
+ complement = true;
+ pat++;
+ }
+ if (*pat++ == c) /* First character is special */
+ goto end;
+
+ while (*pat && *pat != ']') { /* Matching */
+ if (*pat == '-' && *(pat + 1) != ']') { /* Range */
+ if (*(pat - 1) <= c && c <= *(pat + 1))
+ goto end;
+ if (*(pat - 1) > *(pat + 1))
+ goto error;
+ pat += 2;
+ } else if (*pat++ == c)
+ goto end;
+ }
+ if (!*pat)
+ goto error;
+ ret = false;
+
+end:
+ while (*pat && *pat != ']') /* Searching closing */
+ pat++;
+ if (!*pat)
+ goto error;
+ *npat = pat + 1;
+ return complement ? !ret : ret;
+
+error:
+ return false;
+}
+
+/**
+ * strglobmatch - glob expression pattern matching
+ * @str: the target string to match
+ * @pat: the pattern string to match
+ *
+ * This returns true if the @str matches @pat. @pat can includes wildcards
+ * ('*','?') and character classes ([CHARS], complementation and ranges are
+ * also supported). Also, this supports escape character ('\') to use special
+ * characters as normal character.
+ *
+ * Note: if @pat syntax is broken, this always returns false.
+ */
bool strglobmatch(const char *str, const char *pat)
{
while (*str && *pat && *pat != '*') {
- if (*pat == '?') {
+ if (*pat == '?') { /* Matches any single character */
str++;
pat++;
- } else
- if (*str++ != *pat++)
+ continue;
+ } else if (*pat == '[') /* Character classes/Ranges */
+ if (__match_charclass(pat + 1, *str, &pat)) {
+ str++;
+ continue;
+ } else
return false;
+ else if (*pat == '\\') /* Escaped char match as normal char */
+ pat++;
+ if (*str++ != *pat++)
+ return false;
}
/* Check wild card */
if (*pat == '*') {

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com


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