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/*

 *  linux/lib/kasprintf.c

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 */

#include 

#include 

#include 

#include 

#include 

/* 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(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 strdup(fmt);

	if (!strcmp(fmt, "%s"))

        return strdup(va_arg(ap, const char*));

	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);