92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
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/*
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* Copyright (c) 1987 Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifdef DF_POSIX
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#include <bsdlib.h>
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#endif
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getenv.c 5.8 (Berkeley) 2/23/91";
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#endif /* LIBC_SCCS and not lint */
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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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(name)
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const char *name;
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{
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int offset;
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char *_findenv();
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return(_findenv(name, &offset));
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}
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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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* Sets offset to be the offset of the name/value combination in the
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* environmental array, for use by 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(name, offset)
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register char *name;
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int *offset;
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{
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extern char **environ;
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register int len;
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register char **P, *C;
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/*
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for (P = environ; *P; ++P)
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printf("environ X%sX\n", *P);
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*/
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for (C = name, len = 0; *C && *C != '='; ++C, ++len);
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for (P = environ; *P; ++P)
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if (!strncmp(*P, name, len))
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if (*(C = *P + len) == '=') {
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*offset = (int)(P - environ);
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return(++C);
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}
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return(NULL);
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}
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