129 lines
3.2 KiB
C
129 lines
3.2 KiB
C
/*
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* CU sudo version 1.3.1
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 1, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please send bugs, changes, problems to sudo-bugs.cs.colorado.edu
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*
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*******************************************************************
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*
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* This module contains putenv(3) for those systems that lack it.
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*
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* Todd C. Miller (millert@colorado.edu) Sun Aug 7 20:30:17 MDT 1994
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*/
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#ifndef lint
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static char rcsid[] = "$Id$";
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#endif /* lint */
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#include "config.h"
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#include <stdio.h>
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#ifdef STDC_HEADERS
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#include <stdlib.h>
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#endif /* STDC_HEADERS */
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#ifdef HAVE_MALLOC_H
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#include <malloc.h>
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#endif /* HAVE_MALLOC_H */
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#include <errno.h>
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#include <sys/param.h>
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#if !defined(STDC_HEADERS) && !defined(__GNUC__)
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extern char *malloc __P((size_t));
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#endif /* !STDC_HEADERS && !gcc */
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/*
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* Since we can't count on this being defined...
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*/
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extern int errno;
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int putenv __P((const char *));
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/******************************************************************
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*
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* putenv()
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*
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* putenv(3) places a string of the for "name=value" into the environment.
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* Note that this string becomes a part of the environment.
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*/
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int putenv(str)
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const char *str;
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{
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char **current;
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int matchlen, envlen=0;
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char *tmp;
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char **newenv;
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static int first=1;
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extern char ** environ;
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/*
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* find out how much of str to match when searching
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* for a string to replace.
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*/
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if ((tmp = index(str, '=')) == NULL || tmp == str)
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matchlen = strlen(str);
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else
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matchlen = (int) (tmp - str);
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++matchlen;
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/*
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* Search for an existing string in the environment and find the
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* length of environ. If found, replace and exit.
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*/
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for (current=environ; *current; current++) {
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++envlen;
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if (strncmp(str, *current, matchlen) == 0) {
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/* found it, now insert the new version */
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*current = (char *)str;
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return(0);
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}
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}
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/*
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* There wasn't already a slot so add space for a new slot.
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* If this is our first time through, use malloc(), else realloc().
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*/
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if (first) {
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newenv = (char **) malloc(sizeof(char *) * (envlen + 2));
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if (newenv == NULL)
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return(-1);
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first=0;
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(void) memcpy(newenv, environ, sizeof(char *) * envlen);
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} else {
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newenv = (char **) realloc((char *)environ, sizeof(char *) * (envlen + 2));
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if (newenv == NULL)
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return(-1);
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}
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/* actually add in the new entry */
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environ = newenv;
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environ[envlen] = (char *)str;
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environ[envlen+1] = NULL;
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return(0);
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}
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