144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/* This file may have been modified by DJ Delorie (Jan 1991). If so,
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** these modifications are Copyright (C) 1991 DJ Delorie
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*/
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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 are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include <reent.h>
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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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#include "envlock.h"
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extern char **environ;
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/* Only deal with a pointer to environ, to work around subtle bugs with shared
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libraries and/or small data systems where the user declares his own
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'environ'. */
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static char ***p_environ = &environ;
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/* _findenv_r is defined in getenv_r.c. */
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extern char *_findenv_r _PARAMS ((struct _reent *, const char *, int *));
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/*
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* _setenv_r --
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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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_DEFUN (_setenv_r, (reent_ptr, name, value, rewrite),
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struct _reent *reent_ptr _AND
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_CONST char *name _AND
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_CONST char *value _AND
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int rewrite)
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{
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static int alloced; /* if allocated space before */
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register char *C;
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int l_value, offset;
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ENV_LOCK;
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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_r (reent_ptr, name, &offset)))
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{ /* find if already exists */
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if (!rewrite)
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{
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ENV_UNLOCK;
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return 0;
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}
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if (strlen (C) >= l_value)
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{ /* old larger; copy over */
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while ((*C++ = *value++) != 0);
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ENV_UNLOCK;
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return 0;
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}
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}
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else
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{ /* create new slot */
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register int cnt;
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register char **P;
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for (P = *p_environ, cnt = 0; *P; ++P, ++cnt);
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if (alloced)
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{ /* just increase size */
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*p_environ = (char **) _realloc_r (reent_ptr, (char *) environ,
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(size_t) (sizeof (char *) * (cnt + 2)));
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if (!*p_environ)
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{
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ENV_UNLOCK;
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return -1;
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}
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}
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else
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{ /* get new space */
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alloced = 1; /* copy old entries into it */
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P = (char **) _malloc_r (reent_ptr, (size_t) (sizeof (char *) * (cnt + 2)));
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if (!P)
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{
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ENV_UNLOCK;
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return (-1);
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}
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bcopy ((char *) *p_environ, (char *) P, cnt * sizeof (char *));
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*p_environ = P;
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}
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(*p_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 (!((*p_environ)[offset] = /* name + `=' + value */
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_malloc_r (reent_ptr, (size_t) ((int) (C - name) + l_value + 2))))
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{
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ENV_UNLOCK;
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return -1;
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}
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for (C = (*p_environ)[offset]; (*C = *name++) && *C != '='; ++C);
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for (*C++ = '='; (*C++ = *value++) != 0;);
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ENV_UNLOCK;
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return 0;
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}
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/*
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* _unsetenv_r(name) --
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* Delete environmental variable "name".
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*/
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void
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_DEFUN (_unsetenv_r, (reent_ptr, name),
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struct _reent *reent_ptr _AND
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_CONST char *name)
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{
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register char **P;
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int offset;
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ENV_LOCK;
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while (_findenv_r (reent_ptr, name, &offset)) /* if set multiple times */
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for (P = &(*p_environ)[offset];; ++P)
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if (!(*P = *(P + 1)))
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break;
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ENV_UNLOCK;
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}
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