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-rw-r--r--include/linux/ctype.h1
-rw-r--r--include/linux/string.h1
-rw-r--r--lib/string.c19
3 files changed, 17 insertions, 4 deletions
diff --git a/include/linux/ctype.h b/include/linux/ctype.h
index 6dec944a370b..a3d6ee0044f9 100644
--- a/include/linux/ctype.h
+++ b/include/linux/ctype.h
@@ -27,6 +27,7 @@ extern const unsigned char _ctype[];
#define islower(c) ((__ismask(c)&(_L)) != 0)
#define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
#define ispunct(c) ((__ismask(c)&(_P)) != 0)
+/* Note: isspace() must return false for %NUL-terminator */
#define isspace(c) ((__ismask(c)&(_S)) != 0)
#define isupper(c) ((__ismask(c)&(_U)) != 0)
#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
diff --git a/include/linux/string.h b/include/linux/string.h
index b8508868d5ad..168dad11ae03 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -62,6 +62,7 @@ extern char * strnchr(const char *, size_t, int);
#ifndef __HAVE_ARCH_STRRCHR
extern char * strrchr(const char *,int);
#endif
+extern char * __must_check skip_spaces(const char *);
extern char * __must_check strstrip(char *);
#ifndef __HAVE_ARCH_STRSTR
extern char * strstr(const char *,const char *);
diff --git a/lib/string.c b/lib/string.c
index e96421ab9a9a..3a912a4e9a63 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -338,6 +338,20 @@ EXPORT_SYMBOL(strnchr);
#endif
/**
+ * skip_spaces - Removes leading whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Returns a pointer to the first non-whitespace character in @s.
+ */
+char *skip_spaces(const char *str)
+{
+ while (isspace(*str))
+ ++str;
+ return (char *)str;
+}
+EXPORT_SYMBOL(skip_spaces);
+
+/**
* strstrip - Removes leading and trailing whitespace from @s.
* @s: The string to be stripped.
*
@@ -360,10 +374,7 @@ char *strstrip(char *s)
end--;
*(end + 1) = '\0';
- while (*s && isspace(*s))
- s++;
-
- return s;
+ return skip_spaces(s);
}
EXPORT_SYMBOL(strstrip);