xref: /titanic_50/usr/src/lib/libc/port/gen/atoll.c (revision cd3e933325e68e23516a196a8fea7f49b1e497c3)
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	ATOLL
38 
39 #if defined	ATOI
40 typedef int TYPE;
41 #define	NAME	atoi
42 #elif defined ATOL
43 typedef long TYPE;
44 #define	NAME	atol
45 #else
46 typedef longlong_t TYPE;
47 #define	NAME	atoll
48 #endif
49 
50 TYPE
51 NAME(const char *p)
52 {
53 	TYPE n;
54 	int c, neg = 0;
55 	unsigned char	*up = (unsigned char *)p;
56 
57 	if (!isdigit(c = *up)) {
58 		while (isspace(c))
59 			c = *++up;
60 		switch (c) {
61 		case '-':
62 			neg++;
63 			/* FALLTHROUGH */
64 		case '+':
65 			c = *++up;
66 		}
67 		if (!isdigit(c))
68 			return (0);
69 	}
70 	for (n = '0' - c; isdigit(c = *++up); ) {
71 		n *= 10; /* two steps to avoid unnecessary overflow */
72 		n += '0' - c; /* accum neg to avoid surprises at MAX */
73 	}
74 	return (neg ? n : -n);
75 }
76