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a2400fca RL |
1 | /* |
2 | * Copyright (c) 2004, Richard Levitte <richard@levitte.org> | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
ae5c8664 | 13 | * |
bb09fd2b RL |
14 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
15 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
16 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
17 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
18 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
19 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
20 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
a2400fca RL |
25 | */ |
26 | ||
27 | #include <stddef.h> | |
28 | #include <stdlib.h> | |
f1bdf1d5 | 29 | #include <limits.h> |
a2400fca RL |
30 | #include <string.h> |
31 | #include <sys/types.h> | |
32 | #include <dirent.h> | |
33 | #include <errno.h> | |
34 | #ifndef LPDIR_H | |
ae5c8664 | 35 | # include "LPdir.h" |
a2400fca RL |
36 | #endif |
37 | ||
ae5c8664 MC |
38 | /* |
39 | * The POSIXly macro for the maximum number of characters in a file path is | |
40 | * NAME_MAX. However, some operating systems use PATH_MAX instead. | |
41 | * Therefore, it seems natural to first check for PATH_MAX and use that, and | |
42 | * if it doesn't exist, use NAME_MAX. | |
43 | */ | |
bb09fd2b RL |
44 | #if defined(PATH_MAX) |
45 | # define LP_ENTRY_SIZE PATH_MAX | |
46 | #elif defined(NAME_MAX) | |
47 | # define LP_ENTRY_SIZE NAME_MAX | |
48 | #endif | |
49 | ||
ae5c8664 MC |
50 | /* |
51 | * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX | |
52 | * exist. It's also possible that NAME_MAX exists but is define to a very | |
53 | * small value (HP-UX offers 14), so we need to check if we got a result, and | |
54 | * if it meets a minimum standard, and create or change it if not. | |
55 | */ | |
bb09fd2b RL |
56 | #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255 |
57 | # undef LP_ENTRY_SIZE | |
58 | # define LP_ENTRY_SIZE 255 | |
f1bdf1d5 AP |
59 | #endif |
60 | ||
ae5c8664 MC |
61 | struct LP_dir_context_st { |
62 | DIR *dir; | |
63 | char entry_name[LP_ENTRY_SIZE + 1]; | |
a2400fca RL |
64 | }; |
65 | ||
66 | const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory) | |
67 | { | |
ae5c8664 | 68 | struct dirent *direntry = NULL; |
a2400fca | 69 | |
ae5c8664 MC |
70 | if (ctx == NULL || directory == NULL) { |
71 | errno = EINVAL; | |
72 | return 0; | |
a2400fca RL |
73 | } |
74 | ||
ae5c8664 MC |
75 | errno = 0; |
76 | if (*ctx == NULL) { | |
77 | *ctx = (LP_DIR_CTX *)malloc(sizeof(LP_DIR_CTX)); | |
78 | if (*ctx == NULL) { | |
79 | errno = ENOMEM; | |
80 | return 0; | |
81 | } | |
82 | memset(*ctx, '\0', sizeof(LP_DIR_CTX)); | |
a2400fca | 83 | |
ae5c8664 MC |
84 | (*ctx)->dir = opendir(directory); |
85 | if ((*ctx)->dir == NULL) { | |
86 | int save_errno = errno; /* Probably not needed, but I'm paranoid */ | |
87 | free(*ctx); | |
88 | *ctx = NULL; | |
89 | errno = save_errno; | |
90 | return 0; | |
91 | } | |
a2400fca RL |
92 | } |
93 | ||
ae5c8664 MC |
94 | direntry = readdir((*ctx)->dir); |
95 | if (direntry == NULL) { | |
96 | return 0; | |
a2400fca RL |
97 | } |
98 | ||
ae5c8664 MC |
99 | strncpy((*ctx)->entry_name, direntry->d_name, |
100 | sizeof((*ctx)->entry_name) - 1); | |
101 | (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0'; | |
102 | return (*ctx)->entry_name; | |
a2400fca RL |
103 | } |
104 | ||
105 | int LP_find_file_end(LP_DIR_CTX **ctx) | |
106 | { | |
ae5c8664 MC |
107 | if (ctx != NULL && *ctx != NULL) { |
108 | int ret = closedir((*ctx)->dir); | |
a2400fca | 109 | |
ae5c8664 MC |
110 | free(*ctx); |
111 | switch (ret) { | |
112 | case 0: | |
113 | return 1; | |
114 | case -1: | |
115 | return 0; | |
116 | default: | |
117 | break; | |
118 | } | |
a2400fca | 119 | } |
ae5c8664 MC |
120 | errno = EINVAL; |
121 | return 0; | |
a2400fca | 122 | } |