Add a function called strtolower() to convert strings to lower case in-place, overwriting the original string.
This seems to be a recurring requirement in the kernel that is currently being solved by several duplicated implementations doing the same thing.
Signed-off-by: Markus Mayer mmayer@broadcom.com --- include/linux/string.h | 1 + lib/string.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+)
diff --git a/include/linux/string.h b/include/linux/string.h index 26b6f6a..aad605e 100644 --- a/include/linux/string.h +++ b/include/linux/string.h @@ -116,6 +116,7 @@ extern void * memchr(const void *,int,__kernel_size_t); #endif void *memchr_inv(const void *s, int c, size_t n); char *strreplace(char *s, char old, char new); +char *strtolower(char *s);
extern void kfree_const(const void *x);
diff --git a/lib/string.c b/lib/string.c index ed83562..6e3b560 100644 --- a/lib/string.c +++ b/lib/string.c @@ -952,3 +952,17 @@ char *strreplace(char *s, char old, char new) return s; } EXPORT_SYMBOL(strreplace); + +char *strtolower(char *s) +{ + char *p; + + if (unlikely(!s)) + return NULL; + + for (p = s; *p; p++) + *p = tolower(*p); + + return s; +} +EXPORT_SYMBOL(strtolower);