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      1 /* $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp $ */
      2 /*
      3  * Copyright (c) 2004, Richard Levitte <richard (at) levitte.org>
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     18  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     19  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     21  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     25  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
     26 
     27 #if !defined(_POSIX_C_SOURCE)
     28 #define _POSIX_C_SOURCE 201409  /* for readdir_r */
     29 #endif
     30 
     31 #include "directory.h"
     32 
     33 
     34 #if !defined(OPENSSL_WINDOWS)
     35 
     36 #include <dirent.h>
     37 #include <errno.h>
     38 #include <stdlib.h>
     39 #include <string.h>
     40 
     41 #if defined(OPENSSL_PNACL)
     42 /* pnacl doesn't include readdir_r! So we do the best we can. */
     43 int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result) {
     44   errno = 0;
     45   *result = readdir(dirp);
     46   if (*result != NULL) {
     47     return 0;
     48   }
     49   if (errno) {
     50     return 1;
     51   }
     52   return 0;
     53 }
     54 #endif
     55 
     56 struct OPENSSL_dir_context_st {
     57   DIR *dir;
     58   struct dirent dirent;
     59 };
     60 
     61 const char *OPENSSL_DIR_read(OPENSSL_DIR_CTX **ctx, const char *directory) {
     62   struct dirent *dirent;
     63 
     64   if (ctx == NULL || directory == NULL) {
     65     errno = EINVAL;
     66     return NULL;
     67   }
     68 
     69   errno = 0;
     70   if (*ctx == NULL) {
     71     *ctx = malloc(sizeof(OPENSSL_DIR_CTX));
     72     if (*ctx == NULL) {
     73       errno = ENOMEM;
     74       return 0;
     75     }
     76     memset(*ctx, 0, sizeof(OPENSSL_DIR_CTX));
     77 
     78     (*ctx)->dir = opendir(directory);
     79     if ((*ctx)->dir == NULL) {
     80       int save_errno = errno; /* Probably not needed, but I'm paranoid */
     81       free(*ctx);
     82       *ctx = NULL;
     83       errno = save_errno;
     84       return 0;
     85     }
     86   }
     87 
     88   if (readdir_r((*ctx)->dir, &(*ctx)->dirent, &dirent) != 0 ||
     89       dirent == NULL) {
     90     return 0;
     91   }
     92 
     93   return (*ctx)->dirent.d_name;
     94 }
     95 
     96 int OPENSSL_DIR_end(OPENSSL_DIR_CTX **ctx) {
     97   if (ctx != NULL && *ctx != NULL) {
     98     int r = closedir((*ctx)->dir);
     99     free(*ctx);
    100     *ctx = NULL;
    101     return r == 0;
    102   }
    103 
    104   errno = EINVAL;
    105   return 0;
    106 }
    107 
    108 #endif  /* !OPENSSL_WINDOWS */
    109