ba174a5e38
Not because I admit they are technically wrong and not because of bug reports (I receive nothing). But because I surprisingly meets so strong opposition and resistance so lost any desire to continue that. Anyone who interested in POSIX can dig out what changes and how through cvs diffs.
117 lines
3.6 KiB
C
117 lines
3.6 KiB
C
/*
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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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* 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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)setenv.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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char *__findenv(const char *, int *);
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/*
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* setenv --
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* Set the value of the environmental variable "name" to be
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* "value". If rewrite is set, replace any current value.
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*/
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int
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setenv(name, value, rewrite)
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const char *name;
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const char *value;
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int rewrite;
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{
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extern char **environ;
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static char **alloced; /* if allocated space before */
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char *c;
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int l_value, offset;
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if (*value == '=') /* no `=' in value */
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++value;
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l_value = strlen(value);
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if ((c = __findenv(name, &offset))) { /* find if already exists */
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if (!rewrite)
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return (0);
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if (strlen(c) >= l_value) { /* old larger; copy over */
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while ( (*c++ = *value++) );
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return (0);
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}
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} else { /* create new slot */
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int cnt;
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char **p;
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for (p = environ, cnt = 0; *p; ++p, ++cnt);
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if (alloced == environ) { /* just increase size */
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p = (char **)realloc((char *)environ,
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(size_t)(sizeof(char *) * (cnt + 2)));
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if (!p)
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return (-1);
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alloced = environ = p;
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}
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else { /* get new space */
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/* copy old entries into it */
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p = malloc((size_t)(sizeof(char *) * (cnt + 2)));
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if (!p)
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return (-1);
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bcopy(environ, p, cnt * sizeof(char *));
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alloced = environ = p;
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}
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environ[cnt + 1] = NULL;
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offset = cnt;
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}
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for (c = (char *)name; *c && *c != '='; ++c); /* no `=' in name */
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if (!(environ[offset] = /* name + `=' + value */
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malloc((size_t)((int)(c - name) + l_value + 2))))
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return (-1);
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for (c = environ[offset]; (*c = *name++) && *c != '='; ++c);
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for (*c++ = '='; (*c++ = *value++); );
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return (0);
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}
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/*
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* unsetenv(name) --
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* Delete environmental variable "name".
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*/
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void
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unsetenv(name)
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const char *name;
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{
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extern char **environ;
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char **p;
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int offset;
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while (__findenv(name, &offset)) /* if set multiple times */
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for (p = &environ[offset];; ++p)
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if (!(*p = *(p + 1)))
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break;
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}
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