From 8a659f6ff9a364fb48fbfa95d70d09134b579627 Mon Sep 17 00:00:00 2001
From: Denys Vlasenko <vda.linux@googlemail.com>
Date: Sat, 3 Apr 2010 00:52:16 +0200
Subject: libbb: make index_in_substrings return -1 on ambiguous matches
function old new delta
index_in_substrings 67 93 +26
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
libbb/compare_string_array.c | 23 ++++++++++++++++++++---
1 file changed, 20 insertions(+), 3 deletions(-)
(limited to 'libbb')
diff --git a/libbb/compare_string_array.c b/libbb/compare_string_array.c
index 43c59e8e0..599449fe0 100644
--- a/libbb/compare_string_array.c
+++ b/libbb/compare_string_array.c
@@ -53,19 +53,24 @@ int FAST_FUNC index_in_substr_array(const char *const string_array[], const char
int FAST_FUNC index_in_substrings(const char *strings, const char *key)
{
- int len = strlen(key);
+ int matched_idx = -1;
+ const int len = strlen(key);
if (len) {
int idx = 0;
while (*strings) {
if (strncmp(strings, key, len) == 0) {
- return idx;
+ if (strings[len] == '\0')
+ return idx; /* exact match */
+ if (matched_idx >= 0)
+ return -1; /* ambiguous match */
+ matched_idx = idx;
}
strings += strlen(strings) + 1; /* skip NUL */
idx++;
}
}
- return -1;
+ return matched_idx;
}
const char* FAST_FUNC nth_string(const char *strings, int n)
@@ -76,3 +81,15 @@ const char* FAST_FUNC nth_string(const char *strings, int n)
}
return strings;
}
+
+#ifdef UNUSED_SO_FAR /* only brctl.c needs it yet */
+/* Returns 0 for no, 1 for yes or a negative value on error. */
+smallint FAST_FUNC yesno(const char *str)
+{
+ static const char no_yes[] ALIGN1 =
+ "0\0" "off\0" "no\0"
+ "1\0" "on\0" "yes\0";
+ int ret = index_in_substrings(no_yes, str);
+ return ret / 3;
+}
+#endif
--
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