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Subject[PATCH 1/2] strstrip API
From
Date
From: Pekka Enberg <penberg@cs.helsinki.fi>

This patch adds a new strstrip() function to lib/string.c for removing
leading and trailing whitespace from a string.

Cc: Michael Holzheu <holzheu@de.ibm.com>
Cc: Ingo Oeser <ioe-lkml@rameria.de>
Cc: Jörn Engel <joern@wohnheim.fh-wedel.de>
Cc: Corey Minyard <minyard@acm.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

---
include/linux/string.h | 1 +
lib/string.c | 30 ++++++++++++++++++++++++++++++
2 files changed, 31 insertions(+), 0 deletions(-)
1a360da62131fb81460ca4abf93d20b9d0d390ff
diff --git a/include/linux/string.h b/include/linux/string.h
index c61306d..e4c7558 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -56,6 +56,7 @@ #endif
#ifndef __HAVE_ARCH_STRRCHR
extern char * strrchr(const char *,int);
#endif
+extern char * strstrip(char *);
#ifndef __HAVE_ARCH_STRSTR
extern char * strstr(const char *,const char *);
#endif
diff --git a/lib/string.c b/lib/string.c
index 064f631..6307726 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -301,6 +301,36 @@ char *strnchr(const char *s, size_t coun
EXPORT_SYMBOL(strnchr);
#endif

+/**
+ * strstrip - Removes leading and trailing whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Note that the first trailing whitespace is replaced with a %NUL-terminator
+ * in the given string @s. Returns a pointer to the first non-whitespace
+ * character in @s.
+ */
+char *strstrip(char *s)
+{
+ size_t size;
+ char *end;
+
+ size = strlen(s);
+
+ if (!size)
+ return s;
+
+ end = s + size - 1;
+ while (end != s && isspace(*end))
+ end--;
+ *(end + 1) = '\0';
+
+ while (*s && isspace(*s))
+ s++;
+
+ return s;
+}
+EXPORT_SYMBOL(strstrip);
+
#ifndef __HAVE_ARCH_STRLEN
/**
* strlen - Find the length of a string
--
1.3.0


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