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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@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                 :            : 
      28                 :            : #include <stddef.h>
      29                 :            : #include <stdlib.h>
      30                 :            : #include <limits.h>
      31                 :            : #include <string.h>
      32                 :            : #include <sys/types.h>
      33                 :            : #include <dirent.h>
      34                 :            : #include <errno.h>
      35                 :            : #ifndef LPDIR_H
      36                 :            : #include "LPdir.h"
      37                 :            : #endif
      38                 :            : 
      39                 :            : /* The POSIXly macro for the maximum number of characters in a file path
      40                 :            :    is NAME_MAX.  However, some operating systems use PATH_MAX instead.
      41                 :            :    Therefore, it seems natural to first check for PATH_MAX and use that,
      42                 :            :    and if it doesn't exist, use NAME_MAX. */
      43                 :            : #if defined(PATH_MAX)
      44                 :            : # define LP_ENTRY_SIZE PATH_MAX
      45                 :            : #elif defined(NAME_MAX)
      46                 :            : # define LP_ENTRY_SIZE NAME_MAX
      47                 :            : #endif
      48                 :            : 
      49                 :            : /* Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
      50                 :            :    exist.  It's also possible that NAME_MAX exists but is define to a
      51                 :            :    very small value (HP-UX offers 14), so we need to check if we got a
      52                 :            :    result, and if it meets a minimum standard, and create or change it
      53                 :            :    if not. */
      54                 :            : #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
      55                 :            : # undef LP_ENTRY_SIZE
      56                 :            : # define LP_ENTRY_SIZE 255
      57                 :            : #endif
      58                 :            : 
      59                 :            : struct LP_dir_context_st
      60                 :            : {
      61                 :            :   DIR *dir;
      62                 :            :   char entry_name[LP_ENTRY_SIZE+1];
      63                 :            : };
      64                 :            : 
      65                 :          0 : const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
      66                 :            : {
      67                 :          0 :   struct dirent *direntry = NULL;
      68                 :            : 
      69         [ #  # ]:          0 :   if (ctx == NULL || directory == NULL)
      70                 :            :     {
      71                 :          0 :       errno = EINVAL;
      72                 :          0 :       return 0;
      73                 :            :     }
      74                 :            : 
      75                 :          0 :   errno = 0;
      76         [ #  # ]:          0 :   if (*ctx == NULL)
      77                 :            :     {
      78                 :          0 :       *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX));
      79         [ #  # ]:          0 :       if (*ctx == NULL)
      80                 :            :         {
      81                 :          0 :           errno = ENOMEM;
      82                 :          0 :           return 0;
      83                 :            :         }
      84                 :          0 :       memset(*ctx, '\0', sizeof(LP_DIR_CTX));
      85                 :            : 
      86                 :          0 :       (*ctx)->dir = opendir(directory);
      87         [ #  # ]:          0 :       if ((*ctx)->dir == NULL)
      88                 :            :         {
      89                 :          0 :           int save_errno = errno; /* Probably not needed, but I'm paranoid */
      90                 :          0 :           free(*ctx);
      91                 :          0 :           *ctx = NULL;
      92                 :          0 :           errno = save_errno;
      93                 :          0 :           return 0;
      94                 :            :         }
      95                 :            :     }
      96                 :            : 
      97                 :          0 :   direntry = readdir((*ctx)->dir);
      98         [ #  # ]:          0 :   if (direntry == NULL)
      99                 :            :     {
     100                 :            :       return 0;
     101                 :            :     }
     102                 :            : 
     103                 :          0 :   strncpy((*ctx)->entry_name, direntry->d_name, sizeof((*ctx)->entry_name) - 1);
     104                 :          0 :   (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
     105                 :          0 :   return (*ctx)->entry_name;
     106                 :            : }
     107                 :            : 
     108                 :          0 : int LP_find_file_end(LP_DIR_CTX **ctx)
     109                 :            : {
     110 [ #  # ][ #  # ]:          0 :   if (ctx != NULL && *ctx != NULL)
     111                 :            :     {
     112                 :          0 :       int ret = closedir((*ctx)->dir);
     113                 :            : 
     114                 :          0 :       free(*ctx);
     115      [ #  #  # ]:          0 :       switch (ret)
     116                 :            :         {
     117                 :            :         case 0:
     118                 :            :           return 1;
     119                 :            :         case -1:
     120                 :          0 :           return 0;
     121                 :            :         default:
     122                 :            :           break;
     123                 :            :         }
     124                 :            :     }
     125                 :          0 :   errno = EINVAL;
     126                 :          0 :   return 0;
     127                 :            : }