lunaix-os/usr/file_test.c

   1 #include <errno.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <unistd.h>
   5
   6 #define BUFSIZE 4096
   7
   8 static char buffer[BUFSIZE];
   9
  10 #define _open(f, o)                                                 \
  11     ({                                                              \
  12         int __fd = open(f, o);                                      \
  13         if (__fd < 0) {                                             \
  14             printf("open failed: %s (error: %d)", f, errno);   \
  15             _exit(__fd);                                            \
  16         }                                                           \
  17         __fd;                                                       \
  18     })
  19
  20 int
  21 main(int argc, const char* argv[])
  22 {
  23     int fd = 0, fdrand = 0;
  24     int size = 0, sz2 = 0;
  25
  26     fd = _open(argv[1], O_RDWR | O_CREAT);
  27     fdrand = _open("/dev/rand", O_RDONLY);
  28
  29     for (int i = 0; i < 100; i++)
  30     {
  31         printf("write to file: (round) {%d}/100\n", i + 1);
  32
  33         size = read(fdrand, buffer, BUFSIZE);
  34         printf(">>> read random chars: %d\n", size);
  35         for (int i = 0; i < size; i++)
  36         {
  37             buffer[i] = (char)((unsigned char)(buffer[i] % 94U) + 33U);
  38         }
  39
  40         sz2 += write(fd, buffer, size);
  41         sz2 += write(fd, "\n\n", 2);
  42     }
  43
  44     close(fd);
  45     close(fdrand);
  46
  47     return 0;
  48 }