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1 | /* $RCSfile: directory.c,v $$Revision: 4.0.1.1 $$Date: 91/06/07 11:22:24 $ |
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2 | * |
| 3 | * (C) Copyright 1987, 1988, 1990 Diomidis Spinellis. |
| 4 | * |
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5 | * You may distribute under the terms of either the GNU General Public |
| 6 | * License or the Artistic License, as specified in the README file. |
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7 | * |
| 8 | * $Log: directory.c,v $ |
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9 | * Revision 4.0.1.1 91/06/07 11:22:24 lwall |
| 10 | * patch4: new copyright notice |
| 11 | * |
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12 | * Revision 4.0 91/03/20 01:34:24 lwall |
| 13 | * 4.0 baseline. |
| 14 | * |
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15 | * Revision 3.0.1.1 90/03/27 16:07:37 lwall |
| 16 | * patch16: MSDOS support |
| 17 | * |
| 18 | * Revision 1.3 90/03/16 22:39:40 dds |
| 19 | * Fixed malloc problem. |
| 20 | * |
| 21 | * Revision 1.2 88/07/23 00:08:39 dds |
| 22 | * Added inode non-zero filling. |
| 23 | * |
| 24 | * Revision 1.1 88/07/23 00:03:50 dds |
| 25 | * Initial revision |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * UNIX compatible directory access functions |
| 31 | */ |
| 32 | |
| 33 | #include <sys/types.h> |
| 34 | #include <sys/dir.h> |
| 35 | #include <stddef.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <string.h> |
| 38 | #include <dos.h> |
| 39 | #include <ctype.h> |
| 40 | |
| 41 | /* |
| 42 | * File names are converted to lowercase if the |
| 43 | * CONVERT_TO_LOWER_CASE variable is defined. |
| 44 | */ |
| 45 | #define CONVERT_TO_LOWER_CASE |
| 46 | |
| 47 | #define PATHLEN 65 |
| 48 | |
| 49 | #ifndef lint |
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50 | static char rcsid[] = "$RCSfile: directory.c,v $$Revision: 4.0.1.1 $$Date: 91/06/07 11:22:24 $"; |
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51 | #endif |
| 52 | |
| 53 | DIR * |
| 54 | opendir(char *filename) |
| 55 | { |
| 56 | DIR *p; |
| 57 | char *oldresult, *result; |
| 58 | union REGS srv; |
| 59 | struct SREGS segregs; |
| 60 | register reslen = 0; |
| 61 | char scannamespc[PATHLEN]; |
| 62 | char *scanname = scannamespc; /* To take address we need a pointer */ |
| 63 | |
| 64 | /* |
| 65 | * Structure used by the MS-DOS directory system calls. |
| 66 | */ |
| 67 | struct dir_buff { |
| 68 | char reserved[21]; /* Reserved for MS-DOS */ |
| 69 | unsigned char attribute; /* Attribute */ |
| 70 | unsigned int time; /* Time */ |
| 71 | unsigned int date; /* Date */ |
| 72 | long size; /* Size of file */ |
| 73 | char fn[13]; /* Filename */ |
| 74 | } buffspc, *buff = &buffspc; |
| 75 | |
| 76 | |
| 77 | if (!(p = (DIR *) malloc(sizeof(DIR)))) |
| 78 | return NULL; |
| 79 | |
| 80 | /* Initialize result to use realloc on it */ |
| 81 | if (!(result = malloc(1))) { |
| 82 | free(p); |
| 83 | return NULL; |
| 84 | } |
| 85 | |
| 86 | /* Create the search pattern */ |
| 87 | strcpy(scanname, filename); |
| 88 | if (strchr("/\\", *(scanname + strlen(scanname) - 1)) == NULL) |
| 89 | strcat(scanname, "/*.*"); |
| 90 | else |
| 91 | strcat(scanname, "*.*"); |
| 92 | |
| 93 | segread(&segregs); |
| 94 | #if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) ) |
| 95 | segregs.ds = FP_SEG(buff); |
| 96 | srv.x.dx = FP_OFF(buff); |
| 97 | #else |
| 98 | srv.x.dx = (unsigned int) buff; |
| 99 | #endif |
| 100 | srv.h.ah = 0x1a; /* Set DTA to DS:DX */ |
| 101 | intdosx(&srv, &srv, &segregs); |
| 102 | |
| 103 | #if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) ) |
| 104 | segregs.ds = FP_SEG(scanname); |
| 105 | srv.x.dx = FP_OFF(scanname); |
| 106 | #else |
| 107 | srv.x.dx = (unsigned int) scanname; |
| 108 | #endif |
| 109 | srv.x.cx = 0xff; /* Search mode */ |
| 110 | |
| 111 | for (srv.h.ah = 0x4e; !intdosx(&srv, &srv, &segregs); srv.h.ah = 0x4f) { |
| 112 | if ((result = (char *) realloc(result, reslen + strlen(buff->fn) + 1)) == |
| 113 | NULL) { |
| 114 | free(p); |
| 115 | free(oldresult); |
| 116 | return NULL; |
| 117 | } |
| 118 | oldresult = result; |
| 119 | #ifdef CONVERT_TO_LOWER_CASE |
| 120 | strcpy(result + reslen, strlwr(buff->fn)); |
| 121 | #else |
| 122 | strcpy(result + reslen, buff->fn); |
| 123 | #endif |
| 124 | reslen += strlen(buff->fn) + 1; |
| 125 | } |
| 126 | |
| 127 | if (!(result = realloc(result, reslen + 1))) { |
| 128 | free(p); |
| 129 | free(oldresult); |
| 130 | return NULL; |
| 131 | } else { |
| 132 | p->start = result; |
| 133 | p->curr = result; |
| 134 | *(result + reslen) = '\0'; |
| 135 | return p; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | |
| 140 | struct direct * |
| 141 | readdir(DIR *dirp) |
| 142 | { |
| 143 | char *p; |
| 144 | register len; |
| 145 | static dummy; |
| 146 | |
| 147 | p = dirp->curr; |
| 148 | len = strlen(p); |
| 149 | if (*p) { |
| 150 | dirp->curr += len + 1; |
| 151 | strcpy(dirp->dirstr.d_name, p); |
| 152 | dirp->dirstr.d_namlen = len; |
| 153 | /* To fool programs */ |
| 154 | dirp->dirstr.d_ino = ++dummy; |
| 155 | return &(dirp->dirstr); |
| 156 | } else |
| 157 | return NULL; |
| 158 | } |
| 159 | |
| 160 | long |
| 161 | telldir(DIR *dirp) |
| 162 | { |
| 163 | return (long) dirp->curr; /* ouch! pointer to long cast */ |
| 164 | } |
| 165 | |
| 166 | void |
| 167 | seekdir(DIR *dirp, long loc) |
| 168 | { |
| 169 | dirp->curr = (char *) loc; /* ouch! long to pointer cast */ |
| 170 | } |
| 171 | |
| 172 | void |
| 173 | rewinddir(DIR *dirp) |
| 174 | { |
| 175 | dirp->curr = dirp->start; |
| 176 | } |
| 177 | |
| 178 | void |
| 179 | closedir(DIR *dirp) |
| 180 | { |
| 181 | free(dirp->start); |
| 182 | free(dirp); |
| 183 | } |
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