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/* Copyright (C) 2004 Manuel Novoa III <mjn3@codepoet.org>
*
* GNU Library General Public License (LGPL) version 2 or later.
*
* Dedicated to Toni. See uClibc/DEDICATION.mjn3 for details.
*/
#include "_stdio.h"
#include <stdarg.h>
#ifdef __UCLIBC_MJN3_ONLY__
/* Do the memstream stuff inline to avoid fclose and the openlist? */
#warning CONSIDER: avoid open_memstream call?
#endif
#ifndef __STDIO_HAS_VSNPRINTF
#warning Skipping vasprintf since no vsnprintf!
#else
/* Deal with pre-C99 compilers. */
#ifndef va_copy
#ifdef __va_copy
#define va_copy(A,B) __va_copy(A,B)
#else
#warning Neither va_copy (C99/SUSv3) nor __va_copy is defined. Using a simple copy instead. But you should really check that this is appropriate...
#define va_copy(A,B) A = B
#endif
#endif /* va_copy */
int vasprintf(char **__restrict buf, const char * __restrict format,
va_list arg)
{
#ifdef __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__
FILE *f;
size_t size;
int rv = -1;
*buf = NULL;
if ((f = open_memstream(buf, &size)) != NULL) {
rv = vfprintf(f, format, arg);
fclose(f);
if (rv < 0) {
free(*buf);
*buf = NULL;
}
}
assert(rv >= -1);
return rv;
#else /* __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ */
/* This implementation actually calls the printf machinery twice, but only
* only does one malloc. This can be a problem though when custom printf
* specs or the %m specifier are involved because the results of the
* second call might be different from the first. */
va_list arg2;
int rv;
va_copy(arg2, arg);
rv = vsnprintf(NULL, 0, format, arg2);
va_end(arg2);
*buf = NULL;
if (rv >= 0) {
if ((*buf = malloc(++rv)) != NULL) {
if ((rv = vsnprintf(*buf, rv, format, arg)) < 0) {
free(*buf);
*buf = NULL;
}
}
}
assert(rv >= -1);
return rv;
#endif /* __UCLIBC_HAS_GLIBC_CUSTOM_STREAMS__ */
}
#endif
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