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87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
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/* Copyright (C) 1992 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef HAVE_GNU_LD
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#define __environ environ
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#endif
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int
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DEFUN(setenv, (name, value, replace),
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CONST char *name AND CONST char *value AND int replace)
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{
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register char **ep;
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register size_t size;
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CONST size_t namelen = strlen (name);
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CONST size_t vallen = strlen (value);
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size = 0;
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for (ep = __environ; *ep != NULL; ++ep)
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if (!strncmp (*ep, name, namelen) && (*ep)[namelen] == '=')
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break;
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else
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++size;
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if (*ep == NULL)
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{
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static char **last_environ = NULL;
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char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
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if (new_environ == NULL)
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return -1;
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(void) memcpy((PTR) new_environ, (PTR) __environ, size * sizeof(char *));
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new_environ[size] = malloc (namelen + 1 + vallen + 1);
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if (new_environ[size] == NULL)
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{
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free (new_environ);
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errno = ENOMEM;
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return -1;
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}
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memcpy (new_environ[size], name, namelen);
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new_environ[size][namelen] = '=';
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memcpy (&new_environ[size][namelen + 1], value, vallen + 1);
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new_environ[size + 1] = NULL;
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if (last_environ != NULL)
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free ((PTR) last_environ);
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last_environ = new_environ;
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__environ = new_environ;
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}
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else if (replace)
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{
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size_t len = strlen (*ep);
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if (len < namelen + 1 + vallen)
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{
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char *new = malloc (namelen + 1 + vallen);
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if (new == NULL)
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return -1;
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*ep = new;
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}
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memcpy (*ep, name, namelen);
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(*ep)[namelen] = '=';
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memcpy (&(*ep)[namelen + 1], value, vallen + 1);
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}
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return 0;
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}
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