com32/lib/sys/zfopen.c

   1 /*
   2  * zfopen.c
   3  */
   4
   5 #include <stdio.h>
   6 #include <unistd.h>
   7 #include <fcntl.h>
   8 #include <syslinux/zio.h>
   9
  10 FILE *zfopen(const char *file, const char *mode)
  11 {
  12     int flags = O_RDONLY;
  13     int plus = 0;
  14     int fd;
  15
  16     while (*mode) {
  17         switch (*mode) {
  18         case 'r':
  19             flags = O_RDONLY;
  20             break;
  21         case 'w':
  22             flags = O_WRONLY | O_CREAT | O_TRUNC;
  23             break;
  24         case 'a':
  25             flags = O_WRONLY | O_CREAT | O_APPEND;
  26             break;
  27         case '+':
  28             plus = 1;
  29             break;
  30         }
  31         mode++;
  32     }
  33
  34     if (plus) {
  35         flags = (flags & ~(O_RDONLY | O_WRONLY)) | O_RDWR;
  36     }
  37
  38     fd = zopen(file, flags, 0666);
  39
  40     if (fd < 0)
  41         return NULL;
  42     else
  43         return fdopen(fd, mode);
  44 }