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glibc/stdio-common/tst-rndseek.c
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#include <errno.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
static char fname[] = "/tmp/rndseek.XXXXXX"; | |
static char tempdata[65 * 1024]; | |
static int do_test (void); | |
#define TEST_FUNCTION do_test () | |
#define TIMEOUT 4 | |
#include "../test-skeleton.c" | |
static int | |
fp_test (const char *name, FILE *fp) | |
{ | |
int result = 0; | |
int rounds = 10000; | |
do | |
{ | |
int idx = random () % (sizeof (tempdata) - 2); | |
char ch1; | |
char ch2; | |
if (fseek (fp, idx, SEEK_SET) != 0) | |
{ | |
printf ("%s: %d: fseek failed: %m\n", name, rounds); | |
result = 1; | |
break; | |
} | |
ch1 = fgetc_unlocked (fp); | |
ch2 = tempdata[idx]; | |
if (ch1 != ch2) | |
{ | |
printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n", | |
name, rounds, idx, ch1, ch2); | |
result = 1; | |
break; | |
} | |
ch1 = fgetc (fp); | |
ch2 = tempdata[idx + 1]; | |
if (ch1 != ch2) | |
{ | |
printf ("%s: %d: character at index %d not what is expected ('%c' vs '%c')\n", | |
name, rounds, idx + 1, ch1, ch2); | |
result = 1; | |
break; | |
} | |
} | |
while (--rounds > 0); | |
fclose (fp); | |
return result; | |
} | |
static int | |
do_test (void) | |
{ | |
int fd; | |
FILE *fp; | |
size_t i; | |
int result; | |
fd = mkstemp (fname); | |
if (fd == -1) | |
{ | |
printf ("cannot open temporary file: %m\n"); | |
return 1; | |
} | |
/* Make sure the file gets removed. */ | |
add_temp_file (fname); | |
/* Repeatability demands this. */ | |
srandom (42); | |
/* First create some temporary data. */ | |
for (i = 0; i < sizeof (tempdata); ++i) | |
tempdata[i] = 'a' + random () % 26; | |
/* Write this data to a file. */ | |
if (TEMP_FAILURE_RETRY (write (fd, tempdata, sizeof (tempdata))) | |
!= sizeof (tempdata)) | |
{ | |
printf ("cannot wrote data to temporary file: %m\n"); | |
return 1; | |
} | |
/* Now try reading the data. */ | |
fp = fdopen (dup (fd), "r"); | |
if (fp == NULL) | |
{ | |
printf ("cannot duplicate temporary file descriptor: %m\n"); | |
return 1; | |
} | |
rewind (fp); | |
for (i = 0; i < sizeof (tempdata); ++i) | |
{ | |
int ch0 = fgetc (fp); | |
char ch1 = ch0; | |
char ch2 = tempdata[i]; | |
if (ch0 == EOF) | |
{ | |
puts ("premature end of file while reading data"); | |
return 1; | |
} | |
if (ch1 != ch2) | |
{ | |
printf ("%zd: '%c' vs '%c'\n", i, ch1, ch2); | |
return 1; | |
} | |
} | |
result = fp_test ("fdopen(\"r\")", fp); | |
fp = fopen (fname, "r"); | |
result |= fp_test ("fopen(\"r\")", fp); | |
fp = fopen64 (fname, "r"); | |
result |= fp_test ("fopen64(\"r\")", fp); | |
/* The "rw" mode will prevent the mmap-using code from being used. */ | |
fp = fdopen (fd, "rw"); | |
result = fp_test ("fdopen(\"rw\")", fp); | |
fp = fopen (fname, "rw"); | |
result |= fp_test ("fopen(\"rw\")", fp); | |
fp = fopen64 (fname, "rw"); | |
result |= fp_test ("fopen64(\"rw\")", fp); | |
return result; | |
} |