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glibc/stdio-common/bug5.c
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/* If stdio is working correctly, after this is run infile and outfile | |
will have the same contents. If the bug (found in GNU C library 0.3) | |
exhibits itself, outfile will be missing the 2nd through 1023rd | |
characters. */ | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <unistd.h> | |
static char buf[8192]; | |
int | |
main (void) | |
{ | |
FILE *in; | |
FILE *out; | |
static char inname[] = "/tmp/bug5.in"; | |
static char outname[] = "/tmp/bug5.out"; | |
char *printbuf; | |
size_t i; | |
int result; | |
/* Create a test file. */ | |
in = fopen (inname, "w+"); | |
if (in == NULL) | |
{ | |
perror (inname); | |
return 1; | |
} | |
for (i = 0; i < 1000; ++i) | |
fprintf (in, "%Zu\n", i); | |
out = fopen (outname, "w"); | |
if (out == NULL) | |
{ | |
perror (outname); | |
return 1; | |
} | |
if (fseek (in, 0L, SEEK_SET) != 0) | |
abort (); | |
putc (getc (in), out); | |
i = fread (buf, 1, sizeof (buf), in); | |
if (i == 0) | |
{ | |
perror ("fread"); | |
return 1; | |
} | |
if (fwrite (buf, 1, i, out) != i) | |
{ | |
perror ("fwrite"); | |
return 1; | |
} | |
fclose (in); | |
fclose (out); | |
puts ("There should be no further output from this test."); | |
fflush (stdout); | |
/* We must remove this entry to assure the `cmp' binary does not use | |
the perhaps incompatible new shared libraries. */ | |
unsetenv ("LD_LIBRARY_PATH"); | |
asprintf (&printbuf, "cmp %s %s", inname, outname); | |
result = system (printbuf); | |
remove (inname); | |
remove (outname); | |
exit ((result != 0)); | |
} |