>Number:         23889
>Category:       lib
>Synopsis:       iconv(3) returns -1 (failure) when passed an empty input string
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 26 14:38:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Valeriy E. Ushakov
>Release:        -current as of November 2003
>Organization:
>Environment:
Don't have any current machine handy, but it's not important.
FWIW, dmesg.boot of one of the machines says:

NetBSD 1.6ZG (NADA) #0: Tue Dec 23 05:54:19 MSK 2003
        uwe@sampo:/export/netbsd/cvs/src/sys/arch/hpcsh/compile/NADA

>Description:
chat/micq crashes because iconv(3) returns -1 (failure) when passed
en empty input string.  gnu iconv correctly returns 0 in that case.
A minimized test case is below.
>How-To-Repeat:
#include <iconv.h>

static char src[64], dst[64];

main()
{
	iconv_t cnv;
	const char *in;
	char *out;	
	size_t inleft, outleft;
	size_t status;

	cnv = iconv_open("UTF-8", "KOI8-R");
	if (cnv == (iconv_t)(-1)) {
		perror("iconv_open");
		exit(1);
	}

	/* change inleft below to 1 to test */
	strcpy(src, "\300");	/* CYRILLIC SMALL LETTER YU: utf8: \321\216 */

	in = src;
	out = dst;
	inleft = 0;		/* <- */
	outleft = 63;
	
	status = iconv(cnv, &in, &inleft, &out, &outleft);

	if (status == (size_t)(-1)) {
		perror("iconv");
		exit(1);
	}

	if (status > 0) {
		printf("%d bad conversions\n", status);
	}

	*out = '\0';
	printf("%s", dst);
}

>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted: