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file_open.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "config.h"
20 #include "internal.h"
21 #include "mem.h"
22 #include <stdarg.h>
23 #include <fcntl.h>
24 #include <sys/stat.h>
25 #if HAVE_UNISTD_H
26 #include <unistd.h>
27 #endif
28 #if HAVE_IO_H
29 #include <io.h>
30 #endif
31 
32 #if defined(_WIN32) && !defined(__MINGW32CE__)
33 #undef open
34 #undef lseek
35 #undef stat
36 #undef fstat
37 #include <windows.h>
38 #include <share.h>
39 #include <errno.h>
40 #include "wchar_filename.h"
41 
42 static int win32_open(const char *filename_utf8, int oflag, int pmode)
43 {
44  int fd;
45  wchar_t *filename_w;
46 
47  /* convert UTF-8 to wide chars */
48  if (utf8towchar(filename_utf8, &filename_w))
49  return -1;
50  if (!filename_w)
51  goto fallback;
52 
53  fd = _wsopen(filename_w, oflag, SH_DENYNO, pmode);
54  av_freep(&filename_w);
55 
56  if (fd != -1 || (oflag & O_CREAT))
57  return fd;
58 
59 fallback:
60  /* filename may be in CP_ACP */
61  return _sopen(filename_utf8, oflag, SH_DENYNO, pmode);
62 }
63 #define open win32_open
64 #endif
65 
66 int avpriv_open(const char *filename, int flags, ...)
67 {
68  int fd;
69  unsigned int mode = 0;
70  va_list ap;
71 
72  va_start(ap, flags);
73  if (flags & O_CREAT)
74  mode = va_arg(ap, unsigned int);
75  va_end(ap);
76 
77 #ifdef O_CLOEXEC
78  flags |= O_CLOEXEC;
79 #endif
80 
81  fd = open(filename, flags, mode);
82 #if HAVE_FCNTL
83  if (fd != -1) {
84  if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
85  av_log(NULL, AV_LOG_DEBUG, "Failed to set close on exec\n");
86  }
87 #endif
88 
89  return fd;
90 }
91 
92 FILE *av_fopen_utf8(const char *path, const char *mode)
93 {
94  int fd;
95  int access;
96  const char *m = mode;
97 
98  switch (*m++) {
99  case 'r': access = O_RDONLY; break;
100  case 'w': access = O_CREAT|O_WRONLY|O_TRUNC; break;
101  case 'a': access = O_CREAT|O_WRONLY|O_APPEND; break;
102  default :
103  errno = EINVAL;
104  return NULL;
105  }
106  while (*m) {
107  if (*m == '+') {
108  access &= ~(O_RDONLY | O_WRONLY);
109  access |= O_RDWR;
110  } else if (*m == 'b') {
111 #ifdef O_BINARY
112  access |= O_BINARY;
113 #endif
114  } else if (*m) {
115  errno = EINVAL;
116  return NULL;
117  }
118  m++;
119  }
120  fd = avpriv_open(path, access, 0666);
121  if (fd == -1)
122  return NULL;
123  return fdopen(fd, mode);
124 }