3.16.65-rc1 review patch. If anyone has any objections, please let me know.
------------------ From: Rasmus Villemoes <[email protected]> commit cd514e727b18ff4d189b8e268db13729a4175091 upstream. lib/string.c contains two functions, strnicmp and strncasecmp, which do roughly the same thing, namely compare two strings case-insensitively up to a given bound. They have slightly different implementations, but the only important difference is that strncasecmp doesn't handle len==0 appropriately; it effectively becomes strcasecmp in that case. strnicmp correctly says that two strings are always equal in their first 0 characters. strncasecmp is the POSIX name for this functionality. So rename the non-broken function to the standard name. To minimize the impact on the rest of the kernel (and since both are exported to modules), make strnicmp a wrapper for strncasecmp. Signed-off-by: Rasmus Villemoes <[email protected]> Cc: Grant Likely <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Dan Carpenter <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> Signed-off-by: Ben Hutchings <[email protected]> --- lib/string.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) --- a/lib/string.c +++ b/lib/string.c @@ -31,14 +31,14 @@ #include <asm/word-at-a-time.h> #include <asm/page.h> -#ifndef __HAVE_ARCH_STRNICMP +#ifndef __HAVE_ARCH_STRNCASECMP /** - * strnicmp - Case insensitive, length-limited string comparison + * strncasecmp - Case insensitive, length-limited string comparison * @s1: One string * @s2: The other string * @len: the maximum number of characters to compare */ -int strnicmp(const char *s1, const char *s2, size_t len) +int strncasecmp(const char *s1, const char *s2, size_t len) { /* Yes, Virginia, it had better be unsigned */ unsigned char c1, c2; @@ -60,6 +60,13 @@ int strnicmp(const char *s1, const char } while (--len); return (int)c1 - (int)c2; } +EXPORT_SYMBOL(strncasecmp); +#endif +#ifndef __HAVE_ARCH_STRNICMP +int strnicmp(const char *s1, const char *s2, size_t len) +{ + return strncasecmp(s1, s2, len); +} EXPORT_SYMBOL(strnicmp); #endif @@ -77,20 +84,6 @@ int strcasecmp(const char *s1, const cha EXPORT_SYMBOL(strcasecmp); #endif -#ifndef __HAVE_ARCH_STRNCASECMP -int strncasecmp(const char *s1, const char *s2, size_t n) -{ - int c1, c2; - - do { - c1 = tolower(*s1++); - c2 = tolower(*s2++); - } while ((--n > 0) && c1 == c2 && c1 != 0); - return c1 - c2; -} -EXPORT_SYMBOL(strncasecmp); -#endif - #ifndef __HAVE_ARCH_STRCPY /** * strcpy - Copy a %NUL terminated string
