Le 01/07/2016 à 01:50, Markus Mayer a écrit :
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 <[email protected]>
---
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);
Why not char *strtolower(char *dest, const char *src) ? This would avoid
multiple string iteration in what I believe is a common usage: string
duplication than strtolower.
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