Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
---
v4: new
lib/string.c | 17 ++++++++++-------
lib/string.h | 1 +
2 files changed, 11 insertions(+), 7 deletions(-)
diff --git a/lib/string.c b/lib/string.c
index e7bcfe945fcf..ee93e25e9821 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -26,15 +26,18 @@ char *strcpy(char *dest, const char *src)
return strcat(dest, src);
}
+int strncmp(const char *a, const char *b, size_t n)
+{
+ for (; n--; ++a, ++b)
+ if (*a != *b || *a == '\0')
+ return *a - *b;
+
+ return 0;
+}
+
int strcmp(const char *a, const char *b)
{
- while (*a == *b) {
- if (*a == '\0') {
- break;
- }
- ++a, ++b;
- }
- return *a - *b;
+ return strncmp(a, b, SIZE_MAX);
}
char *strchr(const char *s, int c)
diff --git a/lib/string.h b/lib/string.h
index 4e24f54d9e23..2391013ad2b1 100644
--- a/lib/string.h
+++ b/lib/string.h
@@ -5,6 +5,7 @@ extern unsigned long strlen(const char *buf);
extern char *strcat(char *dest, const char *src);
extern char *strcpy(char *dest, const char *src);
extern int strcmp(const char *a, const char *b);
+extern int strncmp(const char *a, const char *b, size_t n);
extern char *strchr(const char *s, int c);
extern char *strstr(const char *haystack, const char *needle);
extern void *memset(void *s, int c, size_t n);
--
2.8.2
--
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