tree-wide: convert open calls to remove spaces to skip_spaces() lib function
Makes use of skip_spaces() defined in lib/string.c for removing leading
spaces from strings all over the tree.
It decreases lib.a code size by 47 bytes and reuses the function tree-wide:
text data bss dec hex filename
64688 584 592 65864 10148 (TOTALS-BEFORE)
64641 584 592 65817 10119 (TOTALS-AFTER)
Also, while at it, if we see (*str && isspace(*str)), we can be sure to
remove the first condition (*str) as the second one (isspace(*str)) also
evaluates to 0 whenever *str == 0, making it redundant. In other words,
"a char equals zero is never a space".
Julia Lawall tried the semantic patch (http://coccinelle.lip6.fr) below,
and found occurrences of this pattern on 3 more files:
drivers/leds/led-class.c
drivers/leds/ledtrig-timer.c
drivers/video/output.c
@@
expression str;
@@
( // ignore skip_spaces cases
while (*str && isspace(*str)) { \(str++;\|++str;\) }
|
- *str &&
isspace(*str)
)
Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Cc: Julia Lawall <julia@diku.dk>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Neil Brown <neilb@suse.de>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: David Howells <dhowells@redhat.com>
Cc: <linux-ext4@vger.kernel.org>
Cc: Samuel Ortiz <samuel@sortiz.org>
Cc: Patrick McHardy <kaber@trash.net>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/argv_split.c b/lib/argv_split.c
index 5205a8d..4b1b083 100644
--- a/lib/argv_split.c
+++ b/lib/argv_split.c
@@ -4,17 +4,10 @@
#include <linux/kernel.h>
#include <linux/ctype.h>
+#include <linux/string.h>
#include <linux/slab.h>
#include <linux/module.h>
-static const char *skip_sep(const char *cp)
-{
- while (*cp && isspace(*cp))
- cp++;
-
- return cp;
-}
-
static const char *skip_arg(const char *cp)
{
while (*cp && !isspace(*cp))
@@ -28,7 +21,7 @@
int count = 0;
while (*str) {
- str = skip_sep(str);
+ str = skip_spaces(str);
if (*str) {
count++;
str = skip_arg(str);
@@ -82,7 +75,7 @@
argvp = argv;
while (*str) {
- str = skip_sep(str);
+ str = skip_spaces(str);
if (*str) {
const char *p = str;
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index e22c148..f935029 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -21,6 +21,7 @@
#include <linux/list.h>
#include <linux/sysctl.h>
#include <linux/ctype.h>
+#include <linux/string.h>
#include <linux/uaccess.h>
#include <linux/dynamic_debug.h>
#include <linux/debugfs.h>
@@ -209,8 +210,7 @@
char *end;
/* Skip leading whitespace */
- while (*buf && isspace(*buf))
- buf++;
+ buf = skip_spaces(buf);
if (!*buf)
break; /* oh, it was trailing whitespace */
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index c50733a..7857d4d 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1766,13 +1766,6 @@
#endif /* CONFIG_BINARY_PRINTF */
-static noinline char *skip_space(const char *str)
-{
- while (isspace(*str))
- ++str;
- return (char *)str;
-}
-
/**
* vsscanf - Unformat a buffer into a list of arguments
* @buf: input buffer
@@ -1794,8 +1787,8 @@
* white space, including none, in the input.
*/
if (isspace(*fmt)) {
- fmt = skip_space(fmt);
- str = skip_space(str);
+ fmt = skip_spaces(++fmt);
+ str = skip_spaces(str);
}
/* anything that is not a conversion must match exactly */
@@ -1865,7 +1858,7 @@
if (field_width == -1)
field_width = INT_MAX;
/* first, skip leading white space in buffer */
- str = skip_space(str);
+ str = skip_spaces(str);
/* now copy until next white space */
while (*str && !isspace(*str) && field_width--)
@@ -1907,7 +1900,7 @@
/* have some sort of integer conversion.
* first, skip white space in buffer.
*/
- str = skip_space(str);
+ str = skip_spaces(str);
digit = *str;
if (is_sign && digit == '-')