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Annotation of embedaddon/sudo/compat/unsetenv.c, revision 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: }