From 94df290404cd0da8016698bf3f398410f29d9a64 Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Thu, 25 Jun 2015 15:02:22 -0700 Subject: lib/string.c: introduce strreplace() Strings are sometimes sanitized by replacing a certain character (often '/') by another (often '!'). In a few places, this is done the same way Schlemiel the Painter would do it. Others are slightly smarter but still do multiple strchr() calls. Introduce strreplace() to do this using a single function call and a single pass over the string. One would expect the return value to be one of three things: void, s, or the number of replacements made. I chose the fourth, returning a pointer to the end of the string. This is more likely to be useful (for example allowing the caller to avoid a strlen call). Signed-off-by: Rasmus Villemoes Cc: "Theodore Ts'o" Cc: Greg Kroah-Hartman Cc: Neil Brown Cc: Steven Rostedt Cc: Joe Perches Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- lib/string.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'lib/string.c') diff --git a/lib/string.c b/lib/string.c index bb3d4b6993c4..13d1e84ddb80 100644 --- a/lib/string.c +++ b/lib/string.c @@ -849,3 +849,20 @@ void *memchr_inv(const void *start, int c, size_t bytes) return check_bytes8(start, value, bytes % 8); } EXPORT_SYMBOL(memchr_inv); + +/** + * strreplace - Replace all occurrences of character in string. + * @s: The string to operate on. + * @old: The character being replaced. + * @new: The character @old is replaced with. + * + * Returns pointer to the nul byte at the end of @s. + */ +char *strreplace(char *s, char old, char new) +{ + for (; *s; ++s) + if (*s == old) + *s = new; + return s; +} +EXPORT_SYMBOL(strreplace); -- cgit v1.2.3