You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
57 lines
1.7 KiB
Diff
57 lines
1.7 KiB
Diff
From 11d200e95f3e84c1102e4cc9863a3614fd41f3ad Mon Sep 17 00:00:00 2001
|
|
From: Grant Likely <grant.likely@linaro.org>
|
|
Date: Fri, 14 Mar 2014 17:00:14 +0000
|
|
Subject: [PATCH] lib: add glibc style strchrnul() variant
|
|
|
|
The strchrnul() variant helpfully returns a the end of the string
|
|
instead of a NULL if the requested character is not found. This can
|
|
simplify string parsing code since it doesn't need to expicitly check
|
|
for a NULL return. If a valid string pointer is passed in, then a valid
|
|
null terminated string will always come back out.
|
|
|
|
Signed-off-by: Grant Likely <grant.likely@linaro.org>
|
|
---
|
|
include/linux/string.h | 3 +++
|
|
lib/string.c | 18 ++++++++++++++++++
|
|
2 files changed, 21 insertions(+)
|
|
|
|
--- a/include/linux/string.h
|
|
+++ b/include/linux/string.h
|
|
@@ -52,6 +52,9 @@ extern int strncasecmp(const char *s1, c
|
|
#ifndef __HAVE_ARCH_STRCHR
|
|
extern char * strchr(const char *,int);
|
|
#endif
|
|
+#ifndef __HAVE_ARCH_STRCHRNUL
|
|
+extern char * strchrnul(const char *,int);
|
|
+#endif
|
|
#ifndef __HAVE_ARCH_STRNCHR
|
|
extern char * strnchr(const char *, size_t, int);
|
|
#endif
|
|
--- a/lib/string.c
|
|
+++ b/lib/string.c
|
|
@@ -301,6 +301,24 @@ char *strchr(const char *s, int c)
|
|
EXPORT_SYMBOL(strchr);
|
|
#endif
|
|
|
|
+#ifndef __HAVE_ARCH_STRCHRNUL
|
|
+/**
|
|
+ * strchrnul - Find and return a character in a string, or end of string
|
|
+ * @s: The string to be searched
|
|
+ * @c: The character to search for
|
|
+ *
|
|
+ * Returns pointer to first occurrence of 'c' in s. If c is not found, then
|
|
+ * return a pointer to the null byte at the end of s.
|
|
+ */
|
|
+char *strchrnul(const char *s, int c)
|
|
+{
|
|
+ while (*s && *s != (char)c)
|
|
+ s++;
|
|
+ return (char *)s;
|
|
+}
|
|
+EXPORT_SYMBOL(strchrnul);
|
|
+#endif
|
|
+
|
|
#ifndef __HAVE_ARCH_STRRCHR
|
|
/**
|
|
* strrchr - Find the last occurrence of a character in a string
|