142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/* env.c: Replacement environment handling functions.
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%%% portions-copyright-cmetz
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Portions of this software are Copyright 1996 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.2. Changed ifdefs for libmissing.
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Combined all env functions and made _findenv static.
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Including headers is a good idea, though. Add more headers.
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Modified at NRL for OPIE 2.0.
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Originally from BSD.
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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 the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include "opie_cfg.h"
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#include <stdio.h>
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#if HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#if HAVE_STDLIB_H
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#include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#include "opie.h"
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static char *_findenv FUNCTION((name, offset), register char *name AND 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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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 = 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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#if !HAVE_GETENV
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char *getenv FUNCTION((name), 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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#endif /* !HAVE_GETENV */
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#if !HAVE_SETENV
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int setenv FUNCTION((name, value, rewrite), char *name AND char *value AND int rewrite)
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{
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extern char **environ;
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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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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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register int cnt;
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register char **P;
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for (P = environ, cnt = 0; *P; ++P, ++cnt);
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if (alloced) { /* just increase size */
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environ = (char **) realloc((char *) environ,
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(u_int) (sizeof(char *) * (cnt + 2)));
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if (!environ)
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return (-1);
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} else { /* get new space */
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alloced = 1; /* copy old entries into it */
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P = (char **) malloc((u_int) (sizeof(char *) *
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(cnt + 2)));
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if (!P)
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return (-1);
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strncpy(P, environ, cnt * sizeof(char *));
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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 = name; *C && *C != '='; ++C); /* no `=' in name */
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if (!(environ[offset] = /* name + `=' + value */
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malloc((u_int) ((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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#endif /* !HAVE_SETENV */
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#if !HAVE_UNSETENV
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VOIDRET unsetenv FUNCTION((name), char *name)
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{
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extern char **environ;
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register 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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#endif /* !HAVE_UNSETENV */
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