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vsprintf: pre-calculate final string length for later use

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Signed-off-by: André Goddard Rosa <[email protected]>
Acked-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
André Goddard Rosa 2009-12-14 18:00:56 -08:00 • committed by Linus Torvalds
commit 6c35663411
1 changed files with 5 additions and 4 deletions
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9
lib/vsprintf.c
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@ -1496,13 +1496,14 @@ do { \
case FORMAT_TYPE_STR: {
const char *save_str = va_arg(args, char *);
size_t len;
if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|| (unsigned long)save_str < PAGE_SIZE)
save_str = "(null)";
len = strlen(save_str);
if (str + len + 1 < end)
memcpy(str, save_str, len + 1);
str += len + 1;
len = strlen(save_str) + 1;
if (str + len < end)
memcpy(str, save_str, len);
str += len;
break;
}