reactos/lib/msvcrt/stdio/fopen.c

   1 /* Copyright (C) 1995 DJ Delorie, see COPYING.DJ for details */
   2
   3 #include <msvcrt/sys/types.h>
   4 #include <msvcrt/stdio.h>
   5 #include <msvcrt/io.h>
   6 #include <msvcrt/fcntl.h>
   7 //#include <msvcrt/internal/file.h>
   8
   9 //might change fopen(file,mode) -> fsopen(file,mode,_SH_DENYNO);
  10
  11 #undef _fmode
  12 extern unsigned int _fmode;
  13
  14 FILE *  __alloc_file(void);
  15
  16
  17 FILE* fopen(const char *file, const char *mode)
  18 {
  19   FILE *f;
  20   int fd, rw, oflags = 0;
  21   char tbchar;
  22
  23   if (file == 0)
  24     return 0;
  25   if (mode == 0)
  26     return 0;
  27
  28   f = __alloc_file();
  29   if (f == NULL)
  30     return NULL;
  31
  32   rw = (mode[1] == '+') || (mode[1] && (mode[2] == '+'));
  33
  34   switch (*mode)
  35   {
  36   case 'a':
  37     oflags = O_CREAT | (rw ? O_RDWR : O_WRONLY);
  38     break;
  39   case 'r':
  40     oflags = rw ? O_RDWR : O_RDONLY;
  41     break;
  42   case 'w':
  43     oflags = O_TRUNC | O_CREAT | (rw ? O_RDWR : O_WRONLY);
  44     break;
  45   default:
  46     return (NULL);
  47   }
  48   if (mode[1] == '+')
  49     tbchar = mode[2];
  50   else
  51     tbchar = mode[1];
  52   if (tbchar == 't')
  53     oflags |= O_TEXT;
  54   else if (tbchar == 'b')
  55     oflags |= O_BINARY;
  56   else
  57     oflags |= (_fmode & (O_TEXT|O_BINARY));
  58
  59   fd = _open(file, oflags, 0);
  60   if (fd < 0)
  61     return NULL;
  62
  63 // ms crtdll ensures that writes will end up at the end of file in append mode
  64 // we just move the file pointer to the end of file initially
  65   if (*mode == 'a')
  66     lseek(fd, 0, SEEK_END);
  67
  68   f->_cnt = 0;
  69   f->_file = fd;
  70   f->_bufsiz = 0;
  71   if (rw)
  72     f->_flag = _IOREAD | _IOWRT;
  73   else if (*mode == 'r')
  74     f->_flag = _IOREAD;
  75   else
  76     f->_flag = _IOWRT;
  77
  78   f->_base = f->_ptr = NULL;
  79   return f;
  80 }
  81
  82 FILE* _wfopen(const wchar_t *file, const wchar_t *mode)
  83 {
  84   FILE *f;
  85   int fd, rw, oflags = 0;
  86   wchar_t tbchar;
  87
  88   if (file == 0)
  89     return 0;
  90   if (mode == 0)
  91     return 0;
  92
  93   f = __alloc_file();
  94   if (f == NULL)
  95     return NULL;
  96
  97   rw = (mode[1] == L'+') || (mode[1] && (mode[2] == L'+'));
  98
  99   switch (*mode)
 100   {
 101   case L'a':
 102     oflags = O_CREAT | (rw ? O_RDWR : O_WRONLY);
 103     break;
 104   case L'r':
 105     oflags = rw ? O_RDWR : O_RDONLY;
 106     break;
 107   case L'w':
 108     oflags = O_TRUNC | O_CREAT | (rw ? O_RDWR : O_WRONLY);
 109     break;
 110   default:
 111     return (NULL);
 112   }
 113   if (mode[1] == L'+')
 114     tbchar = mode[2];
 115   else
 116     tbchar = mode[1];
 117   if (tbchar == L't')
 118     oflags |= O_TEXT;
 119   else if (tbchar == L'b')
 120     oflags |= O_BINARY;
 121   else
 122     oflags |= (_fmode & (O_TEXT|O_BINARY));
 123
 124   fd = _wopen(file, oflags, 0);
 125   if (fd < 0)
 126     return NULL;
 127
 128 // ms crtdll ensures that writes will end up at the end of file in append mode
 129 // we just move the file pointer to the end of file initially
 130   if (*mode == L'a')
 131     lseek(fd, 0, SEEK_END);
 132
 133   f->_cnt = 0;
 134   f->_file = fd;
 135   f->_bufsiz = 0;
 136   if (rw)
 137     f->_flag = _IOREAD | _IOWRT;
 138   else if (*mode == L'r')
 139     f->_flag = _IOREAD;
 140   else
 141     f->_flag = _IOWRT;
 142
 143   f->_base = f->_ptr = NULL;
 144   return f;
 145 }