diff options
Diffstat (limited to 'lisp/env.c')
| -rw-r--r-- | lisp/env.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/lisp/env.c b/lisp/env.c deleted file mode 100644 index e87793a..0000000 --- a/lisp/env.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Provide setenv() and unsetenv() on platforms that don't have them. - * From FreeBSD's libc. - */ - -/* - * Copyright (c) 1987, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -/* $XFree86$ */ - - -#include <stdlib.h> -#include <stddef.h> -#include <string.h> - -extern char **environ; - -extern int setenv(const char *name, const char *value, int overwrite); -extern void unsetenv(const char *name); - -static char * -findenv(const char *name, int *offset) -{ - int len, i; - const char *np; - char **p, *cp; - - if (name == NULL || environ == NULL) - return NULL; - - for (np = name; *np && *np != '='; ++np) - continue; - len = np - name; - for (p = environ; (cp = *p) != NULL; ++p) { - for (np = name, i = len; i && *cp; i--) - if (*cp++ != *np++) - break; - if (i == 0 && *cp++ == '=') { - *offset = p - environ; - return cp; - } - } - return NULL; -} - -/* - * setenv -- - * Set the value of the environmental variable "name" to be - * "value". If overwrite is set, replace any current value. - */ - -int -setenv(const char *name, const char *value, int overwrite) -{ - static char **alloced; /* if allocated space before */ - char *c; - int l_value, offset; - - if (*value == '=') /* no '=' in value */ - ++value; - l_value = strlen(value); - if ((c = findenv(name, &offset))) { /* find if already exists */ - if (!overwrite) - return 0; - if (strlen(c) >= l_value) { /* old larger; copy over */ - while ((*c++ = *value++)) - ; - return 0; - } - } else { /* create new slot */ - int cnt; - char **p; - - for (p = environ, cnt = 0; *p; ++p, ++cnt) - ; - if (alloced == environ) { /* just increase size */ - p = (char **)realloc((char *)environ, - sizeof(char *) * (cnt + 2)); - if (!p) - return -1; - alloced = environ = p; - } else { /* get new space */ - /* copy old entries into it */ - p = malloc(sizeof(char *) * (cnt + 2)); - if (!p) - return -1; - memcpy(p, environ, cnt * sizeof(char *)); - alloced = environ = p; - } - environ[cnt + 1] = NULL; - offset = cnt; - } - for (c = (char *)name; *c && *c != '='; ++c) /* no '=' in name */ - ; - if (!(environ[offset] = /* name + '=' + value */ - malloc((int)(c - name) + l_value + 2))) - return -1; - for (c = environ[offset]; (*c = *name++) && *c != '='; ++c) - ; - for (*c++ = '='; (*c++ = *value++); ) - ; - return 0; -} - -/* - * unsetenv(name) -- - * Delete environmental variable "name". - */ - -void -unsetenv(const char *name) -{ - char **p; - int offset; - - while (findenv(name, &offset)) /* if set multiple times */ - for (p = &environ[offset];; ++p) - if (!(*p = *(p + 1))) - break; -} - |