stdio-common/tst-rndseek.c

   1 #include <errno.h>
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <unistd.h>
   5
   6
   7 static char fname[] = "/tmp/rndseek.XXXXXX";
   8 static char tempdata[65 * 1024];
   9
  10
  11 static int do_test (void);
  12 #define TEST_FUNCTION do_test ()
  13 #define TIMEOUT 10
  14
  15 #include "../test-skeleton.c"
  16
  17
  18 static int
  19 fp_test (const char *name, FILE *fp)
  20 {
  21   int result = 0;
  22   int rounds = 10000;
  23
  24   do
  25     {
  26       int idx = random () % (sizeof (tempdata) - 2);
  27       char ch1;
  28       char ch2;
  29
  30       if (fseek (fp, idx, SEEK_SET) != 0)
  31         {
  32           printf ("%s: %d: fseek failed: %m\n", name, rounds);
  33           result = 1;
  34           break;
  35         }
  36
  37       ch1 = fgetc_unlocked (fp);
  38       ch2 = tempdata[idx];
  39       if (ch1 != ch2)
  40         {
  41           printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n",
  42                   name, rounds, idx, ch1, ch2);
  43           result = 1;
  44           break;
  45         }
  46
  47       ch1 = fgetc (fp);
  48       ch2 = tempdata[idx + 1];
  49       if (ch1 != ch2)
  50         {
  51           printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n",
  52                   name, rounds, idx + 1, ch1, ch2);
  53           result = 1;
  54           break;
  55         }
  56     }
  57   while (--rounds > 0);
  58
  59   fclose (fp);
  60
  61   return result;
  62 }
  63
  64
  65 static int
  66 do_test (void)
  67 {
  68   int fd;
  69   FILE *fp;
  70   size_t i;
  71   int result;
  72
  73   fd = mkstemp (fname);
  74   if (fd == -1)
  75     {
  76       printf ("cannot open temporary file: %m\n");
  77       return 1;
  78     }
  79   /* Make sure the file gets removed.  */
  80   add_temp_file (fname);
  81
  82   /* Repeatability demands this.  */
  83   srandom (42);
  84
  85   /* First create some temporary data.  */
  86   for (i = 0; i < sizeof (tempdata); ++i)
  87     tempdata[i] = 'a' + random () % 26;
  88
  89   /* Write this data to a file.  */
  90   if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata)))
  91       != sizeof (tempdata))
  92     {
  93       printf ("cannot wrote data to temporary file: %m\n");
  94       return 1;
  95     }
  96
  97   /* Now try reading the data.  */
  98   fp = fdopen (dup (fd), "r");
  99   if (fp == NULL)
 100     {
 101       printf ("cannot duplicate temporary file descriptor: %m\n");
 102       return 1;
 103     }
 104
 105   rewind (fp);
 106   for (i = 0; i < sizeof (tempdata); ++i)
 107     {
 108       int ch0 = fgetc (fp);
 109       char ch1 = ch0;
 110       char ch2 = tempdata[i];
 111
 112       if (ch0 == EOF)
 113         {
 114           puts ("premature end of file while reading data");
 115           return 1;
 116         }
 117
 118       if (ch1 != ch2)
 119         {
 120           printf ("%zd: '%c' vs '%c'\n", i, ch1, ch2);
 121           return 1;
 122         }
 123     }
 124
 125   result = fp_test ("fdopen(\"r\")", fp);
 126
 127   fp = fopen (fname, "r");
 128   result |= fp_test ("fopen(\"r\")", fp);
 129
 130   fp = fopen64 (fname, "r");
 131   result |= fp_test ("fopen64(\"r\")", fp);
 132
 133   /* The "rw" mode will prevent the mmap-using code from being used.  */
 134   fp = fdopen (fd, "rw");
 135   result = fp_test ("fdopen(\"rw\")", fp);
 136
 137   fp = fopen (fname, "rw");
 138   result |= fp_test ("fopen(\"rw\")", fp);
 139
 140   fp = fopen64 (fname, "rw");
 141   result |= fp_test ("fopen64(\"rw\")", fp);
 142
 143   return result;
 144 }