source: buchla-68k/orig/GEMDOS/DIR.C@ fe7b401

Last change on this file since fe7b401 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago

Imported original source code.
  • Property mode set to 100755
File size: 3.5 KB
Line 
1/*
2 =============================================================================
3 dir.c - directory routines similar to unix 4.2 BSD
4 Version 1 -- 1988-12-08 -- D.N. Lynx Crowe
5
6 Modified versions of Usenet public domain source.
7 Original author unknown.
8 =============================================================================
9*/
10
11#include "errno.h"
12#include "dir.h"
13
14extern int errno;
15extern char *calloc();
16
17/*
18
19*/
20
21/*
22 =============================================================================
23 opendir() - opens given directory and reads its contents into memory.
24 Other functions use this data or the DIR structure to do their work.
25 =============================================================================
26*/
27
28DIR *
29opendir(dirname)
30char *dirname;
31{
32 struct direct **namelist;
33 DIR *dirptr;
34
35 dirptr = (DIR *)calloc(1, sizeof(DIR));
36
37 if(dirptr == (DIR *)0) {
38
39 errno = ENOMEM;
40 return((DIR *)0);
41 }
42
43 dirptr->d_magic = DMAGIC;
44 dirptr->d_pos = 0;
45 dirptr->d_length = scandir(dirname, &(dirptr->namelist),
46 (int (*)())0, (int (*)())0);
47
48 if(dirptr->d_length < 0) {
49
50 free((char *)dirptr);
51 return((DIR *)0);
52 }
53
54 return(dirptr);
55}
56
57/*
58
59*/
60
61/*
62 =============================================================================
63 readdir - returns the next directory structure from the list and
64 updates values in the DIR structure.
65 =============================================================================
66*/
67
68struct direct *
69readdir(dirptr)
70DIR *dirptr;
71{
72 if(dirptr->d_magic != DMAGIC) {
73
74 errno = ENOTDIR;
75 return((struct direct *)0);
76 }
77
78 if(dirptr->d_pos >= dirptr->d_length) {
79
80 errno = ENFILE;
81 return((struct direct *)0);
82 }
83
84 return(dirptr->namelist[dirptr->d_pos++]);
85}
86
87/*
88
89*/
90
91/*
92 =============================================================================
93 telldir - return the current position of the directory.
94 =============================================================================
95*/
96
97long
98telldir(dirptr)
99DIR *dirptr;
100{
101 if(dirptr->d_magic != DMAGIC) {
102
103 errno = ENOTDIR;
104 return(-1L);
105 }
106
107 return((long)dirptr->d_pos);
108}
109
110/*
111
112*/
113
114/*
115 =============================================================================
116 seekdir - position the given DIR stream to position given.
117 =============================================================================
118*/
119
120seekdir(dirptr, loc)
121DIR *dirptr;
122long loc;
123{
124 if(dirptr->d_magic != DMAGIC) {
125
126 errno = ENOTDIR;
127 return(-1);
128 }
129
130 if(loc > (long)dirptr->d_length) {
131
132 errno = EINVAL;
133 return(-1);
134 }
135
136 dirptr->d_pos = (int)loc;
137 return(0);
138}
139
140/*
141
142*/
143
144/*
145 =============================================================================
146 rewinddir - rewind given DIR to beginning
147 =============================================================================
148*/
149
150rewinddir(dirptr)
151DIR *dirptr;
152{
153 if(dirptr->d_magic != DMAGIC) {
154
155 errno = ENOTDIR;
156 return(-1);
157 }
158
159 dirptr->d_pos = 0;
160 return(0);
161}
162
163/*
164
165*/
166
167/*
168 =============================================================================
169 closedir - close given directory. destroy given DIR struct so we
170 know it is closed.
171 =============================================================================
172*/
173
174closedir(dirptr)
175DIR *dirptr;
176{
177 if(dirptr->d_magic != DMAGIC) {
178
179 errno = ENOTDIR;
180 return(-1);
181 }
182
183 dirptr->d_magic = ~DMAGIC; /* mess it up a little */
184 freedir(dirptr->namelist);
185 free(dirptr);
186 return(0);
187}
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