8d94a459f246ca45e5184084e060d86bba135883
[packages/old-time.git] / cbits / dirUtils.c
1 /*
2 * (c) The University of Glasgow 2002
3 *
4 * Directory Runtime Support
5 */
6
7 #include "config.h"
8
9 // The following is required on Solaris to force the POSIX versions of
10 // the various _r functions instead of the Solaris versions.
11 #ifdef solaris2_TARGET_OS
12 #define _POSIX_PTHREAD_SEMANTICS
13 #endif
14
15 #include "HsBase.h"
16
17 #if defined(mingw32_TARGET_OS)
18 #include <windows.h>
19 #endif
20
21 /*
22 * read an entry from the directory stream; opt for the
23 * re-entrant friendly way of doing this, if available.
24 */
25 HsInt
26 __hscore_readdir( HsAddr dirPtr, HsAddr pDirEnt )
27 {
28 struct dirent **pDirE = (struct dirent**)pDirEnt;
29 #if HAVE_READDIR_R
30 struct dirent* p;
31 int res;
32 static unsigned int nm_max = -1;
33
34 if (pDirE == NULL) {
35 return -1;
36 }
37 if (nm_max == -1) {
38 #ifdef NAME_MAX
39 nm_max = NAME_MAX + 1;
40 #else
41 nm_max = pathconf(".", _PC_NAME_MAX);
42 if (nm_max == -1) { nm_max = 255; }
43 nm_max++;
44 #endif
45 }
46 p = (struct dirent*)malloc(sizeof(struct dirent) + nm_max);
47 if (p == NULL) return -1;
48 res = readdir_r((DIR*)dirPtr, p, pDirE);
49 if (res != 0) {
50 *pDirE = NULL;
51 free(p);
52 }
53 return res;
54 #else
55
56 if (pDirE == NULL) {
57 return -1;
58 }
59
60 *pDirE = readdir((DIR*)dirPtr);
61 if (*pDirE == NULL) {
62 return -1;
63 } else {
64 return 0;
65 }
66 #endif
67 }