Bug 58249

Summary:	sscanf() does not convert correctly.
Product:	[Retired] Red Hat Linux	Reporter:	Jules Colding <jules>
Component:	glibc	Assignee:	Jakub Jelinek <jakub>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.1	CC:	fweimer
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2002-01-11 22:51:24 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Jules Colding 2002-01-11 22:51:19 UTC

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Description of problem:
The following program does not work:

#include <stdio.h>

main ()
{
	long s;
	unsigned long us;

	sscanf("0xF0F0F0F0", "%lu", &us);
	if (us != 0xf0f0f0f0)
		printf("fail unsigned: expect 0xf0f0f0f0 got 0x%lx\n", us);

	sscanf("0xF0F0F0F0", "%li", &s);
	if (s != 0xf0f0f0f0)
		printf("fail signed: expect 0xf0f0f0f0 got 0x%lx\n", s);
}



Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Compile the sample code and run it.
	

Actual Results:  The output from the sample code is:

fail unsigned: expect 0xf0f0f0f0 got 0x0
fail signed: expect 0xf0f0f0f0 got 0x7fffffff

Expected Results:  The conversion should have worked.

Additional info:

I am using glibc-2.2.4-19.3

Comment 1 Jakub Jelinek 2002-01-14 11:48:32 UTC

glibc is right, please reread info libc on formated input.
%u conversion matches unsigned integer in DECIMAL radix (so it matches 0 but
not the rest) - this is strtoul (, , 10) does.
%i conversion matches optionally signed integer in decimal/octal/hex radix,
is what strtol (, , 0) does. But in this second case the problem is that you're
trying to put an value which doesn't fit into 32-bit signed integer
(errno is set to ERANGE after second sscanf).