1*0Sstevel@tonic-gate /* 2*0Sstevel@tonic-gate * Copyright (c) 1987 Regents of the University of California. 3*0Sstevel@tonic-gate * All rights reserved. 4*0Sstevel@tonic-gate * 5*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 6*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 7*0Sstevel@tonic-gate * are met: 8*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 9*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 10*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 11*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 12*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 13*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 14*0Sstevel@tonic-gate * must display the following acknowledgement: 15*0Sstevel@tonic-gate * This product includes software developed by the University of 16*0Sstevel@tonic-gate * California, Berkeley and its contributors. 17*0Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors 18*0Sstevel@tonic-gate * may be used to endorse or promote products derived from this software 19*0Sstevel@tonic-gate * without specific prior written permission. 20*0Sstevel@tonic-gate * 21*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31*0Sstevel@tonic-gate * SUCH DAMAGE. 32*0Sstevel@tonic-gate */ 33*0Sstevel@tonic-gate 34*0Sstevel@tonic-gate #include "includes.h" 35*0Sstevel@tonic-gate #ifndef HAVE_SETENV 36*0Sstevel@tonic-gate 37*0Sstevel@tonic-gate #if defined(LIBC_SCCS) && !defined(lint) 38*0Sstevel@tonic-gate static char *rcsid = "$OpenBSD: setenv.c,v 1.4 2001/07/09 06:57:45 deraadt Exp $"; 39*0Sstevel@tonic-gate #endif /* LIBC_SCCS and not lint */ 40*0Sstevel@tonic-gate 41*0Sstevel@tonic-gate #include <stdlib.h> 42*0Sstevel@tonic-gate #include <string.h> 43*0Sstevel@tonic-gate 44*0Sstevel@tonic-gate /* 45*0Sstevel@tonic-gate * __findenv -- 46*0Sstevel@tonic-gate * Returns pointer to value associated with name, if any, else NULL. 47*0Sstevel@tonic-gate * Sets offset to be the offset of the name/value combination in the 48*0Sstevel@tonic-gate * environmental array, for use by setenv(3) and unsetenv(3). 49*0Sstevel@tonic-gate * Explicitly removes '=' in argument name. 50*0Sstevel@tonic-gate * 51*0Sstevel@tonic-gate * This routine *should* be a static; don't use it. 52*0Sstevel@tonic-gate */ 53*0Sstevel@tonic-gate char * 54*0Sstevel@tonic-gate __findenv(name, offset) 55*0Sstevel@tonic-gate register const char *name; 56*0Sstevel@tonic-gate int *offset; 57*0Sstevel@tonic-gate { 58*0Sstevel@tonic-gate extern char **environ; 59*0Sstevel@tonic-gate register int len, i; 60*0Sstevel@tonic-gate register const char *np; 61*0Sstevel@tonic-gate register char **p, *cp; 62*0Sstevel@tonic-gate 63*0Sstevel@tonic-gate if (name == NULL || environ == NULL) 64*0Sstevel@tonic-gate return (NULL); 65*0Sstevel@tonic-gate for (np = name; *np && *np != '='; ++np) 66*0Sstevel@tonic-gate ; 67*0Sstevel@tonic-gate len = np - name; 68*0Sstevel@tonic-gate for (p = environ; (cp = *p) != NULL; ++p) { 69*0Sstevel@tonic-gate for (np = name, i = len; i && *cp; i--) 70*0Sstevel@tonic-gate if (*cp++ != *np++) 71*0Sstevel@tonic-gate break; 72*0Sstevel@tonic-gate if (i == 0 && *cp++ == '=') { 73*0Sstevel@tonic-gate *offset = p - environ; 74*0Sstevel@tonic-gate return (cp); 75*0Sstevel@tonic-gate } 76*0Sstevel@tonic-gate } 77*0Sstevel@tonic-gate return (NULL); 78*0Sstevel@tonic-gate } 79*0Sstevel@tonic-gate 80*0Sstevel@tonic-gate /* 81*0Sstevel@tonic-gate * setenv -- 82*0Sstevel@tonic-gate * Set the value of the environmental variable "name" to be 83*0Sstevel@tonic-gate * "value". If rewrite is set, replace any current value. 84*0Sstevel@tonic-gate */ 85*0Sstevel@tonic-gate int 86*0Sstevel@tonic-gate setenv(name, value, rewrite) 87*0Sstevel@tonic-gate register const char *name; 88*0Sstevel@tonic-gate register const char *value; 89*0Sstevel@tonic-gate int rewrite; 90*0Sstevel@tonic-gate { 91*0Sstevel@tonic-gate extern char **environ; 92*0Sstevel@tonic-gate static int alloced; /* if allocated space before */ 93*0Sstevel@tonic-gate register char *C; 94*0Sstevel@tonic-gate int l_value, offset; 95*0Sstevel@tonic-gate char *__findenv(); 96*0Sstevel@tonic-gate 97*0Sstevel@tonic-gate if (*value == '=') /* no `=' in value */ 98*0Sstevel@tonic-gate ++value; 99*0Sstevel@tonic-gate l_value = strlen(value); 100*0Sstevel@tonic-gate if ((C = __findenv(name, &offset))) { /* find if already exists */ 101*0Sstevel@tonic-gate if (!rewrite) 102*0Sstevel@tonic-gate return (0); 103*0Sstevel@tonic-gate if (strlen(C) >= l_value) { /* old larger; copy over */ 104*0Sstevel@tonic-gate while ((*C++ = *value++)) 105*0Sstevel@tonic-gate ; 106*0Sstevel@tonic-gate return (0); 107*0Sstevel@tonic-gate } 108*0Sstevel@tonic-gate } else { /* create new slot */ 109*0Sstevel@tonic-gate register int cnt; 110*0Sstevel@tonic-gate register char **P; 111*0Sstevel@tonic-gate 112*0Sstevel@tonic-gate for (P = environ, cnt = 0; *P; ++P, ++cnt); 113*0Sstevel@tonic-gate if (alloced) { /* just increase size */ 114*0Sstevel@tonic-gate P = (char **)realloc((void *)environ, 115*0Sstevel@tonic-gate (size_t)(sizeof(char *) * (cnt + 2))); 116*0Sstevel@tonic-gate if (!P) 117*0Sstevel@tonic-gate return (-1); 118*0Sstevel@tonic-gate environ = P; 119*0Sstevel@tonic-gate } 120*0Sstevel@tonic-gate else { /* get new space */ 121*0Sstevel@tonic-gate alloced = 1; /* copy old entries into it */ 122*0Sstevel@tonic-gate P = (char **)malloc((size_t)(sizeof(char *) * 123*0Sstevel@tonic-gate (cnt + 2))); 124*0Sstevel@tonic-gate if (!P) 125*0Sstevel@tonic-gate return (-1); 126*0Sstevel@tonic-gate memmove(P, environ, cnt * sizeof(char *)); 127*0Sstevel@tonic-gate environ = P; 128*0Sstevel@tonic-gate } 129*0Sstevel@tonic-gate environ[cnt + 1] = NULL; 130*0Sstevel@tonic-gate offset = cnt; 131*0Sstevel@tonic-gate } 132*0Sstevel@tonic-gate for (C = (char *)name; *C && *C != '='; ++C); /* no `=' in name */ 133*0Sstevel@tonic-gate if (!(environ[offset] = /* name + `=' + value */ 134*0Sstevel@tonic-gate malloc((size_t)((int)(C - name) + l_value + 2)))) 135*0Sstevel@tonic-gate return (-1); 136*0Sstevel@tonic-gate /* LINTED */ 137*0Sstevel@tonic-gate for (C = environ[offset]; (*C = *name++) && *C != '='; ++C) 138*0Sstevel@tonic-gate ; 139*0Sstevel@tonic-gate for (*C++ = '='; (*C++ = *value++); ) 140*0Sstevel@tonic-gate ; 141*0Sstevel@tonic-gate return (0); 142*0Sstevel@tonic-gate } 143*0Sstevel@tonic-gate 144*0Sstevel@tonic-gate /* 145*0Sstevel@tonic-gate * unsetenv(name) -- 146*0Sstevel@tonic-gate * Delete environmental variable "name". 147*0Sstevel@tonic-gate */ 148*0Sstevel@tonic-gate void 149*0Sstevel@tonic-gate unsetenv(name) 150*0Sstevel@tonic-gate const char *name; 151*0Sstevel@tonic-gate { 152*0Sstevel@tonic-gate extern char **environ; 153*0Sstevel@tonic-gate register char **P; 154*0Sstevel@tonic-gate int offset; 155*0Sstevel@tonic-gate char *__findenv(); 156*0Sstevel@tonic-gate 157*0Sstevel@tonic-gate while (__findenv(name, &offset)) /* if set multiple times */ 158*0Sstevel@tonic-gate for (P = &environ[offset];; ++P) 159*0Sstevel@tonic-gate /* LINTED */ 160*0Sstevel@tonic-gate if (!(*P = *(P + 1))) 161*0Sstevel@tonic-gate break; 162*0Sstevel@tonic-gate } 163*0Sstevel@tonic-gate 164*0Sstevel@tonic-gate #endif /* HAVE_SETENV */ 165*0Sstevel@tonic-gate 166*0Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 167