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authorMark Lord <kernel@teksavvy.com>2010-07-02 02:16:14 +0400
committerJeff Garzik <jgarzik@redhat.com>2010-08-02 03:36:03 +0400
commitbce036cea10a8dd21eb8c9bf1b641d8790429c8e (patch)
tree2e0d87245467b30fced2d65e7cfe9352ee930f2c /drivers/ata
parentda10a2002cf25a11f18fa1b5e327b9ed717f819c (diff)
downloadlinux-bce036cea10a8dd21eb8c9bf1b641d8790429c8e.tar.xz
libata: glob_match for ata_device_blacklist (v2)
Replace rudimentry pattern matching with more capable shell-style globbing. This will enable shrinking ata_device_blacklist[] table in subsequent patches, and helps with future editions to the table, such as matching only the end of a firmware revision string etc.. Signed-off-by: Mark Lord <mlord@pobox.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-core.c78
1 files changed, 57 insertions, 21 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ddf8e4862787..f8c72a1867fd 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -4326,29 +4326,65 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
{ }
};
-static int strn_pattern_cmp(const char *patt, const char *name, int wildchar)
+/**
+ * glob_match - match a text string against a glob-style pattern
+ * @text: the string to be examined
+ * @pattern: the glob-style pattern to be matched against
+ *
+ * Either/both of text and pattern can be empty strings.
+ *
+ * Match text against a glob-style pattern, with wildcards and simple sets:
+ *
+ * ? matches any single character.
+ * * matches any run of characters.
+ * [xyz] matches a single character from the set: x, y, or z.
+ *
+ * Note: hyphenated ranges [0-9] are _not_ supported here.
+ * The special characters ?, [, or *, can be matched using a set, eg. [*]
+ *
+ * Example patterns: "SD1?", "SD1[012345]", "*R0", SD*1?[012]*xx"
+ *
+ * This function uses one level of recursion per '*' in pattern.
+ * Since it calls _nothing_ else, and has _no_ explicit local variables,
+ * this will not cause stack problems for any reasonable use here.
+ *
+ * RETURNS:
+ * 0 on match, 1 otherwise.
+ */
+static int glob_match (const char *text, const char *pattern)
{
- const char *p;
- int len;
-
- /*
- * check for trailing wildcard: *\0
- */
- p = strchr(patt, wildchar);
- if (p && ((*(p + 1)) == 0))
- len = p - patt;
- else {
- len = strlen(name);
- if (!len) {
- if (!*patt)
- return 0;
- return -1;
+ do {
+ /* Match single character or a '?' wildcard */
+ if (*text == *pattern || *pattern == '?') {
+ if (!*pattern++)
+ return 0; /* End of both strings: match */
+ } else {
+ /* Match single char against a '[' bracketed ']' pattern set */
+ if (!*text || *pattern != '[')
+ break; /* Not a pattern set */
+ while (*++pattern && *pattern != ']' && *text != *pattern);
+ if (!*pattern || *pattern == ']')
+ return 1; /* No match */
+ while (*pattern && *pattern++ != ']');
+ }
+ } while (*++text && *pattern);
+
+ /* Match any run of chars against a '*' wildcard */
+ if (*pattern == '*') {
+ if (!*++pattern)
+ return 0; /* Match: avoid recursion at end of pattern */
+ /* Loop to handle additional pattern chars after the wildcard */
+ while (*text) {
+ if (glob_match(text, pattern) == 0)
+ return 0; /* Remainder matched */
+ ++text; /* Absorb (match) this char and try again */
}
}
-
- return strncmp(patt, name, len);
+ if (!*text && !*pattern)
+ return 0; /* End of both strings: match */
+ return 1; /* No match */
}
-
+
static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
{
unsigned char model_num[ATA_ID_PROD_LEN + 1];
@@ -4359,10 +4395,10 @@ static unsigned long ata_dev_blacklisted(const struct ata_device *dev)
ata_id_c_string(dev->id, model_rev, ATA_ID_FW_REV, sizeof(model_rev));
while (ad->model_num) {
- if (!strn_pattern_cmp(ad->model_num, model_num, '*')) {
+ if (!glob_match(model_num, ad->model_num)) {
if (ad->model_rev == NULL)
return ad->horkage;
- if (!strn_pattern_cmp(ad->model_rev, model_rev, '*'))
+ if (!glob_match(model_rev, ad->model_rev))
return ad->horkage;
}
ad++;