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[Bug libc/5424] New: printf doesn't behave correctly with huge numbers of characters
- From: "vincent+libc at vinc17 dot org" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sources dot redhat dot com
- Date: 28 Nov 2007 12:13:26 -0000
- Subject: [Bug libc/5424] New: printf doesn't behave correctly with huge numbers of characters
- Reply-to: sourceware-bugzilla at sourceware dot org
When the number of characters is > INT_MAX, printf doesn't return the number of
output characters. The C standard seems to be silent on this point and the
current glibc manual and printf(3) man page are also silent. The following
program was tested on a Debian/etch x86_64 machine:
#ifndef N
#define N 2147483648
#endif
#define STRINGIFY(S) #S
#define MAKE_STR(S) STRINGIFY(S)
#define SN MAKE_STR(N)
#include <stdio.h>
int main (void)
{
int ret;
ret = printf ("%" SN "d%" SN "d", 1, 1);
fprintf (stderr, "ret = %d\n", ret);
return 0;
}
$ ./ret-printf | wc -c
ret = 0
4294967296
I don't know how such cases should be handled, but returning a non-negative
value different from the number of output characters is incorrect.
Moreover, printf doesn't handle field widths larger than 2^31.
--
Summary: printf doesn't behave correctly with huge numbers of
characters
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper at redhat dot com
ReportedBy: vincent+libc at vinc17 dot org
CC: glibc-bugs at sources dot redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=5424
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