1/* msd_dir.c - portable directory routines 2 Copyright (C) 1990 by Thorsten Ohl, td12@ddagsi3.bitnet 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; either version 1, or (at your option) 7 any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 GNU General Public License for more details. */ 13 14/* Everything non trivial in this code is from: @(#)msd_dir.c 1.4 15 87/11/06. A public domain implementation of BSD directory routines 16 for MS-DOS. Written by Michael Rendell ({uunet,utai}michael@garfield), 17 August 1897 */ 18 19 20#include <io.h> 21#include <stdio.h> 22#include <stdlib.h> 23#include <string.h> 24#include <sys/types.h> 25#include <sys/stat.h> 26 27#include <dos.h> 28 29#include <ndir.h> 30 31static void free_dircontents (struct _dircontents *); 32 33/* find ALL files! */ 34#define ATTRIBUTES (_A_RDONLY | _A_HIDDEN | _A_SYSTEM | _A_SUBDIR) 35 36 37 38DIR * 39opendir (const char *name) 40{ 41 struct _finddata_t find_buf; 42 DIR *dirp; 43 struct _dircontents *dp; 44 char name_buf[_MAX_PATH + 1]; 45 char *slash = ""; 46 long hFile; 47 48 if (!name) 49 name = ""; 50 else if (*name) 51 { 52 const char *s; 53 int l = strlen (name); 54 55 s = name + l - 1; 56 if ( !(l == 2 && *s == ':') && *s != '\\' && *s != '/') 57 slash = "/"; /* save to insert slash between path and "*.*" */ 58 } 59 60 strcat (strcat (strcpy (name_buf, name), slash), "*.*"); 61 62 dirp = (DIR *) malloc (sizeof (DIR)); 63 if (dirp == (DIR *)0) 64 return (DIR *)0; 65 66 dirp->dd_loc = 0; 67 dirp->dd_contents = dirp->dd_cp = (struct _dircontents *) 0; 68 69 if ((hFile = _findfirst (name_buf, &find_buf)) < 0) 70 { 71 free (dirp); 72 return (DIR *)0; 73 } 74 75 do 76 { 77 dp = (struct _dircontents *) malloc (sizeof (struct _dircontents)); 78 if (dp == (struct _dircontents *)0) 79 { 80 free_dircontents (dirp->dd_contents); 81 return (DIR *)0; 82 } 83 84 dp->_d_entry = malloc (strlen (find_buf.name) + 1); 85 if (dp->_d_entry == (char *)0) 86 { 87 free (dp); 88 free_dircontents (dirp->dd_contents); 89 return (DIR *)0; 90 } 91 92 if (dirp->dd_contents) 93 dirp->dd_cp = dirp->dd_cp->_d_next = dp; 94 else 95 dirp->dd_contents = dirp->dd_cp = dp; 96 97 strcpy (dp->_d_entry, find_buf.name); 98 99 dp->_d_next = (struct _dircontents *)0; 100 101 } while (!_findnext (hFile, &find_buf)); 102 103 dirp->dd_cp = dirp->dd_contents; 104 105 _findclose(hFile); 106 107 return dirp; 108} 109 110 111void 112closedir (DIR *dirp) 113{ 114 free_dircontents (dirp->dd_contents); 115 free ((char *) dirp); 116} 117 118 119struct direct * 120readdir (DIR *dirp) 121{ 122 static struct direct dp; 123 124 if (dirp->dd_cp == (struct _dircontents *)0) 125 return (struct direct *)0; 126 dp.d_namlen = dp.d_reclen = 127 strlen (strcpy (dp.d_name, dirp->dd_cp->_d_entry)); 128#if 0 /* JB */ 129 strlwr (dp.d_name); /* JF */ 130#endif 131 dp.d_ino = 0; 132 dirp->dd_cp = dirp->dd_cp->_d_next; 133 dirp->dd_loc++; 134 135 return &dp; 136} 137 138 139void 140seekdir (DIR *dirp, long off) 141{ 142 long i = off; 143 struct _dircontents *dp; 144 145 if (off < 0) 146 return; 147 for (dp = dirp->dd_contents; --i >= 0 && dp; dp = dp->_d_next) 148 ; 149 dirp->dd_loc = off - (i + 1); 150 dirp->dd_cp = dp; 151} 152 153 154long 155telldir (DIR *dirp) 156{ 157 return dirp->dd_loc; 158} 159 160 161/* Garbage collection */ 162 163static void 164free_dircontents (struct _dircontents *dp) 165{ 166 struct _dircontents *odp; 167 168 while (dp) 169 { 170 if (dp->_d_entry) 171 free (dp->_d_entry); 172 dp = (odp = dp)->_d_next; 173 free (odp); 174 } 175} 176 177 178#ifdef TEST 179 180void main (int argc, char *argv[]); 181 182void 183main (int argc, char *argv[]) 184{ 185 static DIR *directory; 186 struct direct *entry = (struct direct *)0; 187 188 char *name = ""; 189 190 if (argc > 1) 191 name = argv[1]; 192 193 directory = opendir (name); 194 195 if (!directory) 196 { 197 fprintf (stderr, "can't open directory `%s'.\n", name); 198 exit (2); 199 } 200 201 while (entry = readdir (directory)) 202 printf ("> %s\n", entry->d_name); 203 204 printf ("done.\n"); 205} 206 207#endif /* TEST */ 208 209/* 210 * Local Variables: 211 * mode:C 212 * ChangeLog:ChangeLog 213 * compile-command:make 214 * End: 215 */ 216