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vsprintf: add simple_strntoul

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cpio extraction currently does a memcpy to ensure that the archive hex
fields are null terminated for simple_strtoul(). simple_strntoul() will
allow us to avoid the memcpy.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Link: https://lore.kernel.org/r/20250304061020.9815-4-ddiss@suse.de
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Disseldorp
2025-03-04 16:57:46 +11:00
committed by Christian Brauner
parent 83c0b27266
commit fcc155008a
2 changed files with 8 additions and 0 deletions
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1
include/linux/kstrtox.h
View File

@@ -143,6 +143,7 @@ static inline int __must_check kstrtos32_from_user(const char __user *s, size_t
*/
extern unsigned long simple_strtoul(const char *,char **,unsigned int);
extern unsigned long simple_strntoul(const char *,char **,unsigned int,size_t);
extern long simple_strtol(const char *,char **,unsigned int);
extern unsigned long long simple_strtoull(const char *,char **,unsigned int);
extern long long simple_strtoll(const char *,char **,unsigned int);

7
lib/vsprintf.c
View File

@@ -114,6 +114,13 @@ unsigned long simple_strtoul(const char *cp, char **endp, unsigned int base)
}
EXPORT_SYMBOL(simple_strtoul);
unsigned long simple_strntoul(const char *cp, char **endp, unsigned int base,
size_t max_chars)
{
return simple_strntoull(cp, endp, base, max_chars);
}
EXPORT_SYMBOL(simple_strntoul);
/**
* simple_strtol - convert a string to a signed long
* @cp: The start of the string