]>
Commit | Line | Data |
---|---|---|
0f113f3e MC |
1 | /* |
2 | * $LP: LPlib/source/LPdir_unix.c,v 1.11 2004/09/23 22:07:22 _cvs_levitte Exp | |
3 | * $ | |
4 | */ | |
a2400fca RL |
5 | /* |
6 | * Copyright (c) 2004, Richard Levitte <richard@levitte.org> | |
7 | * All rights reserved. | |
8 | * | |
9 | * Redistribution and use in source and binary forms, with or without | |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
0f113f3e | 17 | * |
bb09fd2b RL |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
21 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
22 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
23 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
24 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
28 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
a2400fca RL |
29 | */ |
30 | ||
31 | #include <stddef.h> | |
32 | #include <stdlib.h> | |
f1bdf1d5 | 33 | #include <limits.h> |
a2400fca RL |
34 | #include <string.h> |
35 | #include <sys/types.h> | |
36 | #include <dirent.h> | |
37 | #include <errno.h> | |
38 | #ifndef LPDIR_H | |
0f113f3e | 39 | # include "LPdir.h" |
a2400fca RL |
40 | #endif |
41 | ||
0f113f3e MC |
42 | /* |
43 | * The POSIXly macro for the maximum number of characters in a file path is | |
44 | * NAME_MAX. However, some operating systems use PATH_MAX instead. | |
45 | * Therefore, it seems natural to first check for PATH_MAX and use that, and | |
46 | * if it doesn't exist, use NAME_MAX. | |
47 | */ | |
bb09fd2b RL |
48 | #if defined(PATH_MAX) |
49 | # define LP_ENTRY_SIZE PATH_MAX | |
50 | #elif defined(NAME_MAX) | |
51 | # define LP_ENTRY_SIZE NAME_MAX | |
52 | #endif | |
53 | ||
0f113f3e MC |
54 | /* |
55 | * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX | |
56 | * exist. It's also possible that NAME_MAX exists but is define to a very | |
57 | * small value (HP-UX offers 14), so we need to check if we got a result, and | |
58 | * if it meets a minimum standard, and create or change it if not. | |
59 | */ | |
bb09fd2b RL |
60 | #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255 |
61 | # undef LP_ENTRY_SIZE | |
62 | # define LP_ENTRY_SIZE 255 | |
f1bdf1d5 AP |
63 | #endif |
64 | ||
0f113f3e MC |
65 | struct LP_dir_context_st { |
66 | DIR *dir; | |
67 | char entry_name[LP_ENTRY_SIZE + 1]; | |
a2400fca RL |
68 | }; |
69 | ||
70 | const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory) | |
71 | { | |
0f113f3e | 72 | struct dirent *direntry = NULL; |
a2400fca | 73 | |
0f113f3e MC |
74 | if (ctx == NULL || directory == NULL) { |
75 | errno = EINVAL; | |
76 | return 0; | |
a2400fca RL |
77 | } |
78 | ||
0f113f3e MC |
79 | errno = 0; |
80 | if (*ctx == NULL) { | |
b4faea50 | 81 | *ctx = malloc(sizeof(**ctx)); |
0f113f3e MC |
82 | if (*ctx == NULL) { |
83 | errno = ENOMEM; | |
84 | return 0; | |
85 | } | |
16f8d4eb | 86 | memset(*ctx, 0, sizeof(**ctx)); |
a2400fca | 87 | |
0f113f3e MC |
88 | (*ctx)->dir = opendir(directory); |
89 | if ((*ctx)->dir == NULL) { | |
90 | int save_errno = errno; /* Probably not needed, but I'm paranoid */ | |
91 | free(*ctx); | |
92 | *ctx = NULL; | |
93 | errno = save_errno; | |
94 | return 0; | |
95 | } | |
a2400fca RL |
96 | } |
97 | ||
0f113f3e MC |
98 | direntry = readdir((*ctx)->dir); |
99 | if (direntry == NULL) { | |
100 | return 0; | |
a2400fca RL |
101 | } |
102 | ||
0f113f3e MC |
103 | strncpy((*ctx)->entry_name, direntry->d_name, |
104 | sizeof((*ctx)->entry_name) - 1); | |
105 | (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0'; | |
106 | return (*ctx)->entry_name; | |
a2400fca RL |
107 | } |
108 | ||
109 | int LP_find_file_end(LP_DIR_CTX **ctx) | |
110 | { | |
0f113f3e MC |
111 | if (ctx != NULL && *ctx != NULL) { |
112 | int ret = closedir((*ctx)->dir); | |
a2400fca | 113 | |
0f113f3e MC |
114 | free(*ctx); |
115 | switch (ret) { | |
116 | case 0: | |
117 | return 1; | |
118 | case -1: | |
119 | return 0; | |
120 | default: | |
121 | break; | |
122 | } | |
a2400fca | 123 | } |
0f113f3e MC |
124 | errno = EINVAL; |
125 | return 0; | |
a2400fca | 126 | } |