155 lines
4.0 KiB
C
155 lines
4.0 KiB
C
/*
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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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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)setenv.c 5.3 (Berkeley) 5/16/90";
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static char sccsid[] = "@(#)getenv.c 5.6 (Berkeley) 5/16/90";
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#endif /* LIBC_SCCS and not lint */
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#include <syslog.h>
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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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setenv(name, value, rewrite)
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register char *name, *value;
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int rewrite;
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{
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extern char **environ, *malloc();
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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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char *_findenv();
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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(!strncmp("_RLD", name, 4) || !strncmp("LD_LIBRARY", name, 10)) {
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/* do not allow the setting of env variables that could affect
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* login via rld; use sprintf to avoid possibility of overrunning
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* syslog buffer. */
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char msg[256];
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sprintf(msg, "ignored attempt to setenv(%.32s,%.128s)", name, value);
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syslog(LOG_AUTH, msg);
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return -1;
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}
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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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}
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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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(sizeof(char *) * (cnt + 2)));
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if (!environ)
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return(-1);
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}
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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((sizeof(char *) *
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(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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environ = P;
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}
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environ[cnt + 1] = 0;
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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(((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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char *name;
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{
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extern char **environ;
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char *_findenv();
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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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/*
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* getenv --
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* Returns ptr to value associated with name, if any, else NULL.
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*/
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char *
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#ifdef sgi
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/* avoid conflicts in libc.so */
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telnet_getenv(name)
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#else
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getenv(name)
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#endif
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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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/*
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* _findenv --
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* Returns pointer to value associated with name, if any, else NULL.
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* Sets offset to be the offset of the name/value combination in the
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* environmental array, for use by setenv(3) and unsetenv(3).
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* Explicitly removes '=' in argument name.
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*/
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char *
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_findenv(name, offset)
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register char *name;
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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(0);
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}
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