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FAT replace compare_sign with strncmp.

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The static function compare_sign is only used to compare the fs_type string
and does not do anything more than what strncmp does.

The addition of the trailing '\0' to fs_type, while legal, is not needed
because the it is never printed out and strncmp does not depend on NULL
terminated strings.

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
This commit is contained in:
Tom Rix 2009-05-20 07:55:41 -05:00 • committed by Wolfgang Denk
parent ecb1dc8922
commit 651351fe98
1 changed files with 3 additions and 33 deletions
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36
fs/fat/fat.c
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@ -140,28 +140,6 @@ dirdelim(char *str)
return -1; return -1;
} }
/*
* Match volume_info fs_type strings.
* Return 0 on match, -1 otherwise.
*/
static int
compare_sign(char *str1, char *str2)
{
char *end = str1+SIGNLEN;
while (str1 != end) {
if (*str1 != *str2) {
return -1;
}
str1++;
str2++;
}
return 0;
}
/* /*
* Extract zero terminated short name from a directory entry. * Extract zero terminated short name from a directory entry.
*/ */
@ -673,7 +651,6 @@ read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
{ {
__u8 block[FS_BLOCK_SIZE]; __u8 block[FS_BLOCK_SIZE];
volume_info *vistart; volume_info *vistart;
char *fstype;
if (disk_read(0, 1, block) < 0) { if (disk_read(0, 1, block) < 0) {
FAT_DPRINT("Error: reading block\n"); FAT_DPRINT("Error: reading block\n");
@ -706,23 +683,16 @@ read_bootsectandvi(boot_sector *bs, volume_info *volinfo, int *fatsize)
} }
memcpy(volinfo, vistart, sizeof(volume_info)); memcpy(volinfo, vistart, sizeof(volume_info));
/*
* Terminate fs_type string. Writing past the end of vistart
* is ok - it's just the buffer.
*/
fstype = vistart->fs_type;
fstype[8] = '\0';
if (*fatsize == 32) { if (*fatsize == 32) {
if (compare_sign(FAT32_SIGN, vistart->fs_type) == 0) { if (strncmp(FAT32_SIGN, vistart->fs_type, SIGNLEN) == 0) {
return 0; return 0;
} }
} else { } else {
if (compare_sign(FAT12_SIGN, vistart->fs_type) == 0) { if (strncmp(FAT12_SIGN, vistart->fs_type, SIGNLEN) == 0) {
*fatsize = 12; *fatsize = 12;
return 0; return 0;
} }
if (compare_sign(FAT16_SIGN, vistart->fs_type) == 0) { if (strncmp(FAT16_SIGN, vistart->fs_type, SIGNLEN) == 0) {
*fatsize = 16; *fatsize = 16;
return 0; return 0;
} }