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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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✗✓ |
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if (name == NULL || environ == NULL) |
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return (NULL); |
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✓✓ |
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for (p = environ + *offset; (cp = *p) != NULL; ++p) { |
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✓✗✓✗
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for (np = name, i = len; i && *cp; i--) |
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✓✓ |
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if (*cp++ != *np++) |
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break; |
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✗✓✗✗
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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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✓✓✓✗
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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); |