ftp.nice.ch/pub/next/unix/mail/elm2.4/elm.2.4pl17.s.tar.gz#/lib/istrcmp.c

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static char rcsid[] = "@(#)$Id: istrcmp.c,v 5.1 1992/10/03 22:41:36 syd Exp $";

/*******************************************************************************
 *  The Elm Mail System  -  $Revision: 5.1 $   $State: Exp $
 *
 *			Copyright (c) 1988-1992 USENET Community Trust
 *			Copyright (c) 1986,1987 Dave Taylor
 *******************************************************************************
 * Bug reports, patches, comments, suggestions should be sent to:
 *
 *	Syd Weinstein, Elm Coordinator
 *	elm@DSI.COM			dsinc!elm
 *
 *******************************************************************************
 * $Log: istrcmp.c,v $
 * Revision 5.1  1992/10/03  22:41:36  syd
 * Initial checkin as of 2.4 Release at PL0
 *
 *
 ******************************************************************************/

/** 

**/

#include "headers.h"
#include <ctype.h>

#ifdef BSD
#undef tolower
#endif


int
istrcmp(s1,s2)
register char *s1, *s2;
{
	/* case insensitive comparison */
	register int d;
	for (;;) {
	  d = ( isupper(*s1) ? tolower(*s1) : *s1 )
		  - ( isupper(*s2) ? tolower(*s2) : *s2 ) ;
	  if ( d != 0 || *s1 == '\0' || *s2 == '\0' )
	    return d;
	  ++s1;
	  ++s2;
	}
	/*NOTREACHED*/
}

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