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Annotation of embedaddon/sudo/compat/unsetenv.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
                      3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: #include <config.h>
                     18: 
                     19: #include <sys/types.h>
                     20: 
                     21: #include <stdio.h>
                     22: #ifdef STDC_HEADERS
                     23: # include <stdlib.h>
                     24: # include <stddef.h>
                     25: #else
                     26: # ifdef HAVE_STDLIB_H
                     27: #  include <stdlib.h>
                     28: # endif
                     29: #endif /* STDC_HEADERS */
                     30: #ifdef HAVE_STRING_H
                     31: # include <string.h>
                     32: #endif /* HAVE_STRING_H */
                     33: #ifdef HAVE_STRINGS_H
                     34: # include <strings.h>
                     35: #endif /* HAVE_STRINGS_H */
                     36: #include <errno.h>
                     37: 
                     38: #include "missing.h"
                     39: 
                     40: extern char **environ; /* global environment */
                     41: 
                     42: #ifdef UNSETENV_VOID
                     43: void
                     44: #else
                     45: int
                     46: #endif
                     47: unsetenv(const char *var)
                     48: {
                     49:     char **ep = environ;
                     50:     size_t len;
                     51: 
                     52:     if (var == NULL || *var == '\0' || strchr(var, '=') != NULL) {
                     53:        errno = EINVAL;
                     54: #ifdef UNSETENV_VOID
                     55:        return;
                     56: #else
                     57:        return -1;
                     58: #endif
                     59:     }
                     60: 
                     61:     len = strlen(var);
                     62:     while (*ep != NULL) {
                     63:        if (strncmp(var, *ep, len) == 0 && (*ep)[len] == '=') {
                     64:            /* Found it; shift remainder + NULL over by one. */
                     65:            char **cur = ep;
                     66:            while ((*cur = *(cur + 1)) != NULL)
                     67:                cur++;
                     68:            /* Keep going, could be multiple instances of the var. */
                     69:        } else {
                     70:            ep++;
                     71:        }
                     72:     }
                     73: #ifndef UNSETENV_VOID
                     74:     return 0;
                     75: #endif
                     76: }