GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libc/stdlib/getenv.c Lines: 11 14 78.6 %
Date: 2017-11-13 Branches: 11 18 61.1 %

Line Branch Exec Source
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/*	$OpenBSD: getenv.c,v 1.12 2016/03/13 18:34:21 guenther Exp $ */
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/*
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 * Copyright (c) 1987, 1993
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <stdlib.h>
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#include <string.h>
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/*
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 * __findenv --
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 *	Returns pointer to value associated with name, if any, else NULL.
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 *	Starts searching within the environmental array at offset.
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 *	Sets offset to be the offset of the name/value combination in the
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 *	environmental array, for use by putenv(3), setenv(3) and unsetenv(3).
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 *	Explicitly removes '=' in argument name.
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 *
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 *	This routine *should* be a static; don't use it.
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 */
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char *
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__findenv(const char *name, int len, int *offset)
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{
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	int i;
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	const char *np;
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	char **p, *cp;
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	if (name == NULL || environ == NULL)
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		return (NULL);
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	for (p = environ + *offset; (cp = *p) != NULL; ++p) {
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		for (np = name, i = len; i && *cp; i--)
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			if (*cp++ != *np++)
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				break;
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		if (i == 0 && *cp++ == '=') {
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			*offset = p - environ;
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			return (cp);
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		}
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	}
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	return (NULL);
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}
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/*
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 * getenv --
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 *	Returns ptr to value associated with name, if any, else NULL.
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 */
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char *
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getenv(const char *name)
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{
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	int offset = 0;
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	const char *np;
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	for (np = name; *np && *np != '='; ++np)
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		;
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	return (__findenv(name, (int)(np - name), &offset));
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}
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DEF_STRONG(getenv);