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