GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/stdio/asprintf.c Lines: 19 30 63.3 %
Date: 2017-11-07 Branches: 3 13 23.1 %

Line Branch Exec Source
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/*	$OpenBSD: asprintf.c,v 1.25 2017/03/17 14:53:08 deraadt Exp $	*/
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/*
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 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
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 *
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 * Permission to use, copy, modify, and distribute this software for any
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 * purpose with or without fee is hereby granted, provided that the above
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 * copyright notice and this permission notice appear in all copies.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include "local.h"
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#define	INITIAL_SIZE	128
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int
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asprintf(char **str, const char *fmt, ...)
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{
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	int ret;
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	va_list ap;
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	FILE f;
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	struct __sfileext fext;
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	const int pgsz = getpagesize();
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	_FILEEXT_SETUP(&f, &fext);
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	f._file = -1;
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	f._flags = __SWR | __SSTR | __SALC;
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	f._bf._base = f._p = malloc(INITIAL_SIZE);
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	if (f._bf._base == NULL)
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		goto err;
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	f._bf._size = f._w = INITIAL_SIZE - 1;	/* leave room for the NUL */
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	va_start(ap, fmt);
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	ret = __vfprintf(&f, fmt, ap);
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	va_end(ap);
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	if (ret == -1)
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		goto err;
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	*f._p = '\0';
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	if (ret + 1 > INITIAL_SIZE && ret + 1 < pgsz / 2) {
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		/* midsize allocations can try to conserve memory */
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		unsigned char *_base = recallocarray(f._bf._base,
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		    f._bf._size + 1, ret + 1, 1);
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		if (_base == NULL)
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			goto err;
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		*str = (char *)_base;
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	} else
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		*str = (char *)f._bf._base;
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	return (ret);
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err:
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	free(f._bf._base);
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	f._bf._base = NULL;
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	*str = NULL;
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	errno = ENOMEM;
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	return (-1);
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}
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DEF_WEAK(asprintf);