mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-09 12:04:15 +08:00
c0891ac15f
Ship minimal stdarg.h (1 type, 4 macros) as <linux/stdarg.h>. stdarg.h is the only userspace header commonly used in the kernel. GPL 2 version of <stdarg.h> can be extracted from http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/lib/kasprintf.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/stdarg.h>
|
|
#include <linux/export.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
|
|
/* Simplified asprintf. */
|
|
char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
|
|
{
|
|
unsigned int first, second;
|
|
char *p;
|
|
va_list aq;
|
|
|
|
va_copy(aq, ap);
|
|
first = vsnprintf(NULL, 0, fmt, aq);
|
|
va_end(aq);
|
|
|
|
p = kmalloc_track_caller(first+1, gfp);
|
|
if (!p)
|
|
return NULL;
|
|
|
|
second = vsnprintf(p, first+1, fmt, ap);
|
|
WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
|
|
first, second, fmt);
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL(kvasprintf);
|
|
|
|
/*
|
|
* If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt
|
|
* (or the sole vararg) points to rodata, we will then save a memory
|
|
* allocation and string copy. In any case, the return value should be
|
|
* freed using kfree_const().
|
|
*/
|
|
const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap)
|
|
{
|
|
if (!strchr(fmt, '%'))
|
|
return kstrdup_const(fmt, gfp);
|
|
if (!strcmp(fmt, "%s"))
|
|
return kstrdup_const(va_arg(ap, const char*), gfp);
|
|
return kvasprintf(gfp, fmt, ap);
|
|
}
|
|
EXPORT_SYMBOL(kvasprintf_const);
|
|
|
|
char *kasprintf(gfp_t gfp, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *p;
|
|
|
|
va_start(ap, fmt);
|
|
p = kvasprintf(gfp, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return p;
|
|
}
|
|
EXPORT_SYMBOL(kasprintf);
|