PS2SDK
PS2 Homebrew Libraries
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strtol.c
1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * The contents of this file constitute Original Code as defined in and
7 * are subject to the Apple Public Source License Version 1.1 (the
8 * "License"). You may not use this file except in compliance with the
9 * License. Please obtain a copy of the License at
10 * http://www.apple.com/publicsource and read it before using this file.
11 *
12 * This Original Code and all software distributed under the License are
13 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17 * License for the specific language governing rights and limitations
18 * under the License.
19 *
20 * @APPLE_LICENSE_HEADER_END@
21 */
22/* Copyright (c) 1995 NeXT Computer, Inc. All rights reserved.
23 *
24 * strol.c - The functions strtol() & strtoul() are exported as public API
25 * via the header file ~driverkit/generalFuncs.h
26 *
27 * HISTORY
28 * 25-Oct-1995 Dean Reece at NeXT
29 * Created based on BSD4.4's strtol.c & strtoul.c.
30 * Removed dependency on _ctype_ by static versions of isupper()...
31 * Added support for "0b101..." binary constants.
32 * Commented out references to errno.
33 */
34
35/*-
36 * Copyright (c) 1990, 1993
37 * The Regents of the University of California. All rights reserved.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 3. All advertising materials mentioning features or use of this software
48 * must display the following acknowledgement:
49 * This product includes software developed by the University of
50 * California, Berkeley and its contributors.
51 * 4. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 */
67
68#include <ctype.h>
69#include <limits.h>
70#include <stdint.h>
71#include <sysclib.h>
72
73/*
74 * Convert a string to a long integer.
75 *
76 * Ignores `locale' stuff. Assumes that the upper and lower case
77 * alphabets and digits are each contiguous.
78 */
79long strtol(const char* nptr, char** endptr, int base)
80{
81 const char* s = nptr;
82 unsigned long acc;
83 int c;
84 unsigned long cutoff;
85 int neg = 0;
86 int any;
87 int cutlim;
88
89 // check base
90 if(base < 0 || base > 36)
91 {
92 // errno = EINVAL
93
94 if(endptr)
95 {
96 *endptr = (char*)(uintptr_t)nptr;
97 }
98
99 return 0;
100 }
101
102 /*
103 * Skip white space and pick up leading +/- sign if any.
104 * If base is 0, allow 0x for hex and 0 for octal, else
105 * assume decimal; if base is already 16, allow 0x.
106 */
107 do
108 {
109 c = *s++;
110 } while(isspace(c));
111
112 if(c == '-')
113 {
114 neg = 1;
115 c = *s++;
116 }
117 else if(c == '+')
118 {
119 c = *s++;
120 }
121
122 if((base == 0 || base == 16) && c == '0' && (*s == 'x' || *s == 'X'))
123 {
124 c = s[1];
125 s += 2;
126 base = 16;
127 }
128 else if((base == 0 || base == 2) && c == '0' && (*s == 'b' || *s == 'B'))
129 {
130 c = s[1];
131 s += 2;
132 base = 2;
133 }
134
135 if(base == 0)
136 {
137 base = c == '0' ? 8 : 10;
138 }
139
140 /*
141 * Compute the cutoff value between legal numbers and illegal
142 * numbers. That is the largest legal value, divided by the
143 * base. An input number that is greater than this value, if
144 * followed by a legal input character, is too big. One that
145 * is equal to this value may be valid or not; the limit
146 * between valid and invalid numbers is then based on the last
147 * digit. For instance, if the range for longs is
148 * [-2147483648..2147483647] and the input base is 10,
149 * cutoff will be set to 214748364 and cutlim to either
150 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
151 * a value > 214748364, or equal but the next digit is > 7 (or 8),
152 * the number is too big, and we will return a range error.
153 *
154 * Set any if any `digits' consumed; make it negative to indicate
155 * overflow.
156 */
157 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
158 cutlim = (int)(cutoff % (unsigned long)base);
159 cutoff /= (unsigned long)base;
160
161 for(acc = 0, any = 0;; c = *s++)
162 {
163 if(isdigit(c))
164 {
165 c -= '0';
166 }
167 else if(isalpha(c))
168 {
169 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
170 }
171 else
172 {
173 break;
174 }
175
176 if(c >= base)
177 {
178 break;
179 }
180
181 if(any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
182 {
183 any = -1;
184 }
185 else
186 {
187 any = 1;
188 acc *= (unsigned long)base;
189 acc += (unsigned long)c;
190 }
191 }
192
193 if(any < 0)
194 {
195 acc = neg ? (unsigned long)LONG_MIN : (unsigned long)LONG_MAX;
196 // errno = ERANGE;
197 }
198 else if(neg)
199 {
200 acc = -acc;
201 }
202
203 if(endptr != 0)
204 {
205 *endptr = (char*)(uintptr_t)(any ? s - 1 : nptr);
206 }
207 return (long)(acc);
208}