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comparison anagram/support/file.cpp @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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-1:000000000000 0:13d2b8934445
1 /*
2 * AnaGram, A System for Syntax Directed Programming
3 * Copyright 1993-1999 Parsifal Software. All Rights Reserved.
4 * Copyright 2006 David A. Holland. All Rights Reserved.
5 * See the file COPYING for license and usage terms.
6 *
7 * file.cpp
8 */
9
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <string.h>
14 #include <limits.h>
15
16 #ifdef AG_ON_WINDOWS
17 #include <direct.h>
18 #include <share.h>
19 #endif
20
21 #ifdef AG_ON_UNIX
22 #define SH_DENYNO 0
23 #define SH_DENYWR 0
24 #endif
25
26 #include "port.h"
27
28 #include "agstring.h"
29 #include "file.h"
30
31 //#define INCLUDE_LOGGING
32 #include "log.h"
33
34
35 AgString work_dir_name;
36
37 ////////////////////////////////////////////////////////////
38
39 /*
40 * Open files, compatibly with DOS file sharing.
41 * (Does this even mean anything in win32?)
42 */
43
44 static int open_shared(const char *path, int openflags, int sharingmode) {
45 int fd;
46
47 LOGSECTION("open_shared");
48 LOGV(path);
49
50 #ifdef AG_ON_UNIX
51 /*
52 * Unix filehandles are always shared, like it or not. We could
53 * conceivably use mandatory locking for the denywrite case... but
54 * (1) mandatory locking isn't universally supported, (2) it'll
55 * likely cause permission problems, and (3) there's really not a
56 * whole lot of point.
57 */
58 (void)sharingmode;
59 fd = open(path, openflags, 0664 /* default mode */);
60 #endif
61
62 #ifdef AG_ON_WINDOWS
63 fd = sopen(path, openflags, sharingmode);
64 #endif
65
66 LOGV(fd);
67 if (fd < 0) {
68 LOGV(strerror(errno));
69 }
70
71 return fd;
72 }
73
74 int open_shared_denywrite(const char *path, int openflags) {
75 LOGSECTION("open_shared_denywrite");
76 return open_shared(path, openflags, SH_DENYWR);
77 }
78
79 int open_shared_any(const char *path, int openflags) {
80 LOGSECTION("open_shared_any");
81 return open_shared(path, openflags, SH_DENYNO);
82 }
83
84 ////////////////////////////////////////////////////////////
85
86 time_t getFileTimestamp(const char *name) {
87 struct stat statbuf;
88
89 stat(name, &statbuf);
90 return statbuf.st_mtime;
91 }
92
93 ////////////////////////////////////////////////////////////
94
95 void set_work_dir(void) {
96 LOGSECTION("set_work_dir");
97
98 // in unix, this only needs to be PATH_MAX, but who knows about windows...
99 char temp[PATH_MAX+1];
100 getcwd(temp, PATH_MAX);
101 work_dir_name = AgString(temp);
102
103 LOGV(work_dir_name);
104 }