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tree-wide: convert open calls to remove spaces to skip_spaces() lib function

Browse Source 
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>
This commit is contained in:
André Goddard Rosa 2009-12-14 18:01:06 -08:00 committed by Linus Torvalds
parent 84c95c9acf
commit e7d2860b69
24 changed files with 66 additions and 115 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/s390/kernel/debug.c
View File

@ -18,6 +18,7 @@
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/sysctl.h>
#include <asm/uaccess.h>
#include <linux/module.h>
@ -1178,7 +1179,7 @@ debug_get_uint(char *buf)
{
int rc;
for(; isspace(*buf); buf++);
buf = skip_spaces(buf);
rc = simple_strtoul(buf, &buf, 10);
if(*buf){
rc = -EINVAL;

16
arch/um/drivers/mconsole_kern.c
View File

@ -6,6 +6,7 @@
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mm.h>
@ -131,7 +132,7 @@ void mconsole_proc(struct mc_request *req)
char *ptr = req->request.data, *buf;
ptr += strlen("proc");
while (isspace(*ptr)) ptr++;
ptr = skip_spaces(ptr);
proc = get_fs_type("proc");
if (proc == NULL) {
@ -212,8 +213,7 @@ void mconsole_proc(struct mc_request *req)
char *ptr = req->request.data;
ptr += strlen("proc");
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr);
snprintf(path, sizeof(path), "/proc/%s", ptr);
fd = sys_open(path, 0, 0);
@ -560,8 +560,7 @@ void mconsole_config(struct mc_request *req)
int err;
ptr += strlen("config");
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr);
dev = mconsole_find_dev(ptr);
if (dev == NULL) {
mconsole_reply(req, "Bad configuration option", 1, 0);
@ -588,7 +587,7 @@ void mconsole_remove(struct mc_request *req)
int err, start, end, n;
ptr += strlen("remove");
while (isspace(*ptr)) ptr++;
ptr = skip_spaces(ptr);
dev = mconsole_find_dev(ptr);
if (dev == NULL) {
mconsole_reply(req, "Bad remove option", 1, 0);
@ -712,7 +711,7 @@ void mconsole_sysrq(struct mc_request *req)
char *ptr = req->request.data;
ptr += strlen("sysrq");
while (isspace(*ptr)) ptr++;
ptr = skip_spaces(ptr);
/*
* With 'b', the system will shut down without a chance to reply,
@ -757,8 +756,7 @@ void mconsole_stack(struct mc_request *req)
*/
ptr += strlen("stack");
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr);
/*
* Should really check for multiple pids or reject bad args here

11
arch/x86/kernel/cpu/mtrr/if.c
View File

@ -4,6 +4,7 @@
#include <linux/proc_fs.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/init.h>
#define LINE_SIZE 80
@ -133,8 +134,7 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
return -EINVAL;
base = simple_strtoull(line + 5, &ptr, 0);
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr);
if (strncmp(ptr, "size=", 5))
return -EINVAL;
@ -142,14 +142,11 @@ mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
size = simple_strtoull(ptr + 5, &ptr, 0);
if ((base & 0xfff) || (size & 0xfff))
return -EINVAL;
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr);
if (strncmp(ptr, "type=", 5))
return -EINVAL;
ptr += 5;
while (isspace(*ptr))
ptr++;
ptr = skip_spaces(ptr + 5);
for (i = 0; i < MTRR_NUM_TYPES; ++i) {
if (strcmp(ptr, mtrr_strings[i]))

2
drivers/leds/led-class.c
View File

@ -50,7 +50,7 @@ static ssize_t led_brightness_store(struct device *dev,
unsigned long state = simple_strtoul(buf, &after, 10);
size_t count = after - buf;
if (*after && isspace(*after))
if (isspace(*after))
count++;
if (count == size) {

4
drivers/leds/ledtrig-timer.c
View File

@ -83,7 +83,7 @@ static ssize_t led_delay_on_store(struct device *dev,
unsigned long state = simple_strtoul(buf, &after, 10);
size_t count = after - buf;
if (*after && isspace(*after))
if (isspace(*after))
count++;
if (count == size) {
@ -127,7 +127,7 @@ static ssize_t led_delay_off_store(struct device *dev,
unsigned long state = simple_strtoul(buf, &after, 10);
size_t count = after - buf;
if (*after && isspace(*after))
if (isspace(*after))
count++;
if (count == size) {

6
drivers/md/dm-table.c
View File

@ -12,6 +12,7 @@
#include <linux/blkdev.h>
#include <linux/namei.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
@ -600,11 +601,8 @@ int dm_split_args(int *argc, char ***argvp, char *input)
return -ENOMEM;
while (1) {
start = end;
/* Skip whitespace */
while (*start && isspace(*start))
start++;
start = skip_spaces(end);
if (!*start)
break; /* success, we hit the end */

4
drivers/md/md.c
View File

@ -39,6 +39,7 @@
#include <linux/buffer_head.h> /* for invalidate_bdev */
#include <linux/poll.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/hdreg.h>
#include <linux/proc_fs.h>
#include <linux/random.h>
@ -3439,8 +3440,7 @@ bitmap_store(mddev_t *mddev, const char *buf, size_t len)
}
if (*end && !isspace(*end)) break;
bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
buf = end;
while (isspace(*buf)) buf++;
buf = skip_spaces(end);
}
bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
out:

9
drivers/parisc/pdc_stable.c
View File

@ -779,12 +779,9 @@ static ssize_t pdcs_auto_write(struct kobject *kobj,
read_unlock(&pathentry->rw_lock);
DPRINTK("%s: flags before: 0x%X\n", __func__, flags);
temp = in;
while (*temp && isspace(*temp))
temp++;
temp = skip_spaces(in);
c = *temp++ - '0';
if ((c != 0) && (c != 1))
goto parse_error;

7
drivers/platform/x86/thinkpad_acpi.c
View File

@ -1006,11 +1006,8 @@ static int parse_strtoul(const char *buf,
{
char *endp;
while (*buf && isspace(*buf))
buf++;
*value = simple_strtoul(buf, &endp, 0);
while (*endp && isspace(*endp))
endp++;
*value = simple_strtoul(skip_spaces(buf), &endp, 0);
endp = skip_spaces(endp);
if (*endp || *value > max)
return -EINVAL;

36
drivers/pnp/interface.c
View File

@ -310,8 +310,7 @@ static ssize_t pnp_set_current_resources(struct device *dmdev,
goto done;
}
while (isspace(*buf))
++buf;
buf = skip_spaces(buf);
if (!strnicmp(buf, "disable", 7)) {
retval = pnp_disable_dev(dev);
goto done;
@ -353,19 +352,13 @@ static ssize_t pnp_set_current_resources(struct device *dmdev,
pnp_init_resources(dev);
mutex_lock(&pnp_res_mutex);
while (1) {
while (isspace(*buf))
++buf;
buf = skip_spaces(buf);
if (!strnicmp(buf, "io", 2)) {
buf += 2;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 2);
start = simple_strtoul(buf, &buf, 0);
while (isspace(*buf))
++buf;
buf = skip_spaces(buf);
if (*buf == '-') {
buf += 1;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 1);
end = simple_strtoul(buf, &buf, 0);
} else
end = start;
@ -373,16 +366,11 @@ static ssize_t pnp_set_current_resources(struct device *dmdev,
continue;
}
if (!strnicmp(buf, "mem", 3)) {
buf += 3;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 3);
start = simple_strtoul(buf, &buf, 0);
while (isspace(*buf))
++buf;
buf = skip_spaces(buf);
if (*buf == '-') {
buf += 1;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 1);
end = simple_strtoul(buf, &buf, 0);
} else
end = start;
@ -390,17 +378,13 @@ static ssize_t pnp_set_current_resources(struct device *dmdev,
continue;
}
if (!strnicmp(buf, "irq", 3)) {
buf += 3;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 3);
start = simple_strtoul(buf, &buf, 0);
pnp_add_irq_resource(dev, start, 0);
continue;
}
if (!strnicmp(buf, "dma", 3)) {
buf += 3;
while (isspace(*buf))
++buf;
buf = skip_spaces(buf + 3);
start = simple_strtoul(buf, &buf, 0);
pnp_add_dma_resource(dev, start, 0);
continue;

5
drivers/s390/block/dasd_proc.c
View File

@ -14,6 +14,7 @@
#define KMSG_COMPONENT "dasd"
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
@ -272,10 +273,10 @@ dasd_statistics_write(struct file *file, const char __user *user_buf,
DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
/* check for valid verbs */
for (str = buffer; isspace(*str); str++);
str = skip_spaces(buffer);
if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
/* 'set xxx' was given */
for (str = str + 4; isspace(*str); str++);
str = skip_spaces(str + 4);
if (strcmp(str, "on") == 0) {
/* switch on statistics profiling */
dasd_profile_level = DASD_PROFILE_ON;

4
drivers/video/backlight/lcd.c
View File

@ -101,7 +101,7 @@ static ssize_t lcd_store_power(struct device *dev,
int power = simple_strtoul(buf, &endp, 0);
size_t size = endp - buf;
if (*endp && isspace(*endp))
if (isspace(*endp))
size++;
if (size != count)
return -EINVAL;
@ -140,7 +140,7 @@ static ssize_t lcd_store_contrast(struct device *dev,
int contrast = simple_strtoul(buf, &endp, 0);
size_t size = endp - buf;
if (*endp && isspace(*endp))
if (isspace(*endp))
size++;
if (size != count)
return -EINVAL;

2
drivers/video/display/display-sysfs.c
View File

@ -67,7 +67,7 @@ static ssize_t display_store_contrast(struct device *dev,
contrast = simple_strtoul(buf, &endp, 0);
size = endp - buf;
if (*endp && isspace(*endp))
if (isspace(*endp))
size++;
if (size != count)

2
drivers/video/output.c
View File

@ -50,7 +50,7 @@ static ssize_t video_output_store_state(struct device *dev,
int request_state = simple_strtoul(buf,&endp,0);
size_t size = endp - buf;
if (*endp && isspace(*endp))
if (isspace(*endp))
size++;
if (size != count)
return -EINVAL;

4
fs/cachefiles/daemon.c
View File

@ -21,6 +21,7 @@
#include <linux/mount.h>
#include <linux/statfs.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/fs_struct.h>
#include "internal.h"
@ -257,8 +258,7 @@ static ssize_t cachefiles_daemon_write(struct file *file,
if (args == data)
goto error;
*args = '\0';
for (args++; isspace(*args); args++)
continue;
args = skip_spaces(++args);
}
/* run the appropriate command handler */

7
fs/ext4/super.c
View File

@ -2137,11 +2137,8 @@ static int parse_strtoul(const char *buf,
{
char *endp;
while (*buf && isspace(*buf))
buf++;
*value = simple_strtoul(buf, &endp, 0);
while (*endp && isspace(*endp))
endp++;
*value = simple_strtoul(skip_spaces(buf), &endp, 0);
endp = skip_spaces(endp);
if (*endp || *value > max)
return -EINVAL;

8
kernel/params.c
View File

@ -24,6 +24,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/string.h>
#if 0
#define DEBUGP printk
@ -122,9 +123,7 @@ static char *next_arg(char *args, char **param, char **val)
next = args + i;
/* Chew up trailing spaces. */
while (isspace(*next))
next++;
return next;
return skip_spaces(next);
}
/* Args looks like "foo=bar,bar2 baz=fuz wiz". */
@ -139,8 +138,7 @@ int parse_args(const char *name,
DEBUGP("Parsing ARGS: %s\n", args);
/* Chew leading spaces */
while (isspace(*args))
args++;
args = skip_spaces(args);
while (*args) {
int ret;

13
lib/argv_split.c
View File

@ -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 @@ static int count_argc(const char *str)
int count = 0;
while (*str) {
str = skip_sep(str);
str = skip_spaces(str);
if (*str) {
count++;
str = skip_arg(str);
@ -82,7 +75,7 @@ char **argv_split(gfp_t gfp, const char *str, int *argcp)
argvp = argv;
while (*str) {
str = skip_sep(str);
str = skip_spaces(str);
if (*str) {
const char *p = str;

4
lib/dynamic_debug.c
View File

@ -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 @@ static int ddebug_tokenize(char *buf, char *words[], int maxwords)
char *end;
/* Skip leading whitespace */
while (*buf && isspace(*buf))
buf++;
buf = skip_spaces(buf);
if (!*buf)
break; /* oh, it was trailing whitespace */

15
lib/vsprintf.c
View File

@ -1766,13 +1766,6 @@ EXPORT_SYMBOL_GPL(bprintf);
#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 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
* 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 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
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 @@ int vsscanf(const char *buf, const char *fmt, va_list args)
/* 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 == '-')

1
net/irda/irnet/irnet.h
View File

@ -249,6 +249,7 @@
#include <linux/poll.h>
#include <linux/capability.h>
#include <linux/ctype.h> /* isspace() */
#include <linux/string.h> /* skip_spaces() */
#include <asm/uaccess.h>
#include <linux/init.h>

8
net/irda/irnet/irnet_ppp.c
View File

@ -76,9 +76,8 @@ irnet_ctrl_write(irnet_socket * ap,
/* Look at the next command */
start = next;
/* Scrap whitespaces before the command */
while(isspace(*start))
start++;
/* Scrap whitespaces before the command */
start = skip_spaces(start);
/* ',' is our command separator */
next = strchr(start, ',');
@ -133,8 +132,7 @@ irnet_ctrl_write(irnet_socket * ap,
char * endp;
/* Scrap whitespaces before the command */
while(isspace(*begp))
begp++;
begp = skip_spaces(begp);
/* Convert argument to a number (last arg is the base) */
addr = simple_strtoul(begp, &endp, 16);

3
net/netfilter/xt_recent.c
View File

@ -482,8 +482,7 @@ static ssize_t recent_old_proc_write(struct file *file,
if (copy_from_user(buf, input, size))
return -EFAULT;
while (isspace(*c))
c++;
c = skip_spaces(c);
if (size - (c - buf) < 5)
return c - buf;

7
sound/pci/hda/hda_hwdep.c
View File

@ -24,6 +24,7 @@
#include <linux/compat.h>
#include <linux/mutex.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/firmware.h>
#include <sound/core.h>
#include "hda_codec.h"
@ -428,8 +429,7 @@ static int parse_hints(struct hda_codec *codec, const char *buf)
char *key, *val;
struct hda_hint *hint;
while (isspace(*buf))
buf++;
buf = skip_spaces(buf);
if (!*buf || *buf == '#' || *buf == '\n')
return 0;
if (*buf == '=')
@ -444,8 +444,7 @@ static int parse_hints(struct hda_codec *codec, const char *buf)
return -EINVAL;
}
*val++ = 0;
while (isspace(*val))
val++;
val = skip_spaces(val);
remove_trail_spaces(key);
remove_trail_spaces(val);
hint = get_hint(codec, key);