com32/lib/fopen.c

   1 /*
   2  * fopen.c
   3  */
   4
   5 #include <stdio.h>
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8
   9 FILE *fopen(const char *file, const char *mode)
  10 {
  11   int flags = O_RDONLY;
  12   int plus = 0;
  13   int fd;
  14
  15   while ( *mode ) {
  16     switch ( *mode ) {
  17     case 'r':
  18       flags = O_RDONLY;
  19       break;
  20     case 'w':
  21       flags = O_WRONLY|O_CREAT|O_TRUNC;
  22       break;
  23     case 'a':
  24       flags = O_WRONLY|O_CREAT|O_APPEND;
  25       break;
  26     case '+':
  27       plus = 1;
  28       break;
  29     }
  30     mode++;
  31   }
  32
  33   if ( plus ) {
  34     flags = (flags & ~(O_RDONLY|O_WRONLY)) | O_RDWR;
  35   }
  36
  37   fd = open(file, flags, 0666);
  38
  39   if ( fd < 0 )
  40     return NULL;
  41   else
  42     return fdopen(fd, mode);
  43 }