stdio-common/tst-fmemopen.c

   1 #include <errno.h>
   2 #include <fcntl.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7 #include <sys/mman.h>
   8 #include <sys/stat.h>
   9 #include <sys/types.h>
  10
  11 int
  12 main (int argc, char **argv)
  13 {
  14   const char *test_file;
  15   const char blah[] = "BLAH";
  16   FILE *fp;
  17   char *mmap_data;
  18   int ch, fd;
  19   struct stat fs;
  20   const char *cp;
  21
  22   /* Construct the test file name based on ARGV[0], which will be
  23      an absolute file name in the build directory.  Don't touch the
  24      source directory, which might be read-only.  */
  25   if (argc != 1 || asprintf (&test_file, "%s.test", argv[0]) < 0)
  26     exit (99);
  27
  28   /* setup the physical file, and use it */
  29   if ((fp = fopen (test_file, "w+")) == NULL)
  30     exit (1);
  31   if (fwrite (blah, 1, strlen (blah), fp) != strlen (blah))
  32     exit (2);
  33
  34   rewind (fp);
  35   printf ("file: ");
  36   cp = blah;
  37   while ((ch = getc (fp)) != EOF)
  38     {
  39       fputc (ch, stdout);
  40       if (ch != *cp)
  41         {
  42           printf ("\ncharacter %td: '%c' instead of '%c'\n",
  43                   cp - blah, ch, *cp);
  44           exit (1);
  45         }
  46       ++cp;
  47     }
  48   fputc ('\n', stdout);
  49   if (ferror (fp))
  50     {
  51       puts ("fp: error");
  52       exit (1);
  53     }
  54   if (feof (fp))
  55     printf ("fp: EOF\n");
  56   else
  57     {
  58       puts ("not EOF");
  59       exit (1);
  60     }
  61   fclose (fp);
  62
  63   /* Now, mmap the file into a buffer, and do that too */
  64   if ((fd = open (test_file, O_RDONLY)) == -1)
  65     exit (3);
  66   if (fstat (fd, &fs) == -1)
  67     exit (4);
  68
  69   if ((mmap_data = (char *) mmap (NULL, fs.st_size, PROT_READ,
  70                                   MAP_SHARED, fd, 0)) == MAP_FAILED)
  71     {
  72       if (errno == ENOSYS)
  73         exit (0);
  74       exit (5);
  75     }
  76
  77   if ((fp = fmemopen (mmap_data, fs.st_size, "r")) == NULL)
  78     exit (1);
  79
  80   printf ("mem: ");
  81   cp = blah;
  82   while ((ch = getc (fp)) != EOF)
  83     {
  84       fputc (ch, stdout);
  85       if (ch != *cp)
  86         {
  87           printf ("%td character: '%c' instead of '%c'\n",
  88                   cp - blah, ch, *cp);
  89           exit (1);
  90         }
  91       ++cp;
  92     }
  93
  94   fputc ('\n', stdout);
  95
  96   if (ferror (fp))
  97     {
  98       puts ("fp: error");
  99       exit (1);
 100     }
 101   if (feof (fp))
 102     printf ("fp: EOF\n");
 103   else
 104     {
 105       puts ("not EOF");
 106       exit (1);
 107     }
 108
 109   fclose (fp);
 110
 111   munmap (mmap_data, fs.st_size);
 112
 113   unlink (test_file);
 114   free (test_file);
 115
 116   return 0;
 117 }