[PATCH] strstrip() API
Add a new strstrip() function to lib/string.c for removing leading and
trailing whitespace from a string.
Cc: Michael Holzheu <holzheu@de.ibm.com>
Acked-by: Ingo Oeser <ioe-lkml@rameria.de>
Acked-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: Corey Minyard <minyard@acm.org>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Michael Holzheu <HOLZHEU@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/lib/string.c b/lib/string.c
index 064f631..63077267 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -301,6 +301,36 @@
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