sortix--sortix/libc/stdio/vfprintf_unlocked.c

/*
 * Copyright (c) 2011, 2012, 2013, 2014, 2015 Jonas 'Sortie' Termansen.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * stdio/vfprintf_unlocked.c
 * Prints a string to a FILE.
 */

#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>

static size_t vfprintf_callback(void* ctx, const char* string, size_t length)
{
	return fwrite_unlocked(string, 1, length, (FILE*) ctx);
}

int vfprintf_unlocked(FILE* fp, const char* restrict format, va_list list)
{
	if ( !(fp->flags & _FILE_WRITABLE) )
		return errno = EBADF, fp->flags |= _FILE_STATUS_ERROR, -1;
	return vcbprintf(fp, vfprintf_callback, format, list);
}