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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include <ctype.h>
     34 #include <sys/types.h>
     35 #include <stdlib.h>
     36 
     37 #define	ATOI
     38 
     39 #ifdef	ATOI
     40 typedef int TYPE;
     41 #define	NAME	atoi
     42 #else
     43 typedef long TYPE;
     44 #define	NAME	atol
     45 #endif
     46 
     47 TYPE
     48 NAME(const char *p)
     49 {
     50 	TYPE n;
     51 	int c, neg = 0;
     52 	unsigned char	*up = (unsigned char *)p;
     53 
     54 	if (!isdigit(c = *up)) {
     55 		while (isspace(c))
     56 			c = *++up;
     57 		switch (c) {
     58 		case '-':
     59 			neg++;
     60 			/* FALLTHROUGH */
     61 		case '+':
     62 			c = *++up;
     63 		}
     64 		if (!isdigit(c))
     65 			return (0);
     66 	}
     67 	for (n = '0' - c; isdigit(c = *++up); ) {
     68 		n *= 10; /* two steps to avoid unnecessary overflow */
     69 		n += '0' - c; /* accum neg to avoid surprises at MAX */
     70 	}
     71 	return (neg ? n : -n);
     72 }
     73