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comparison target-utils/libc/strtoul.c @ 96:d8d03dafb9c0

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target-utils/libc: strtol and strtoul added from 4.4BSD with simplification
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 31 Oct 2016 23:35:48 +0000
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95:3670e7768ab6 96:d8d03dafb9c0
1 /*
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34 /*
35 * Embedded libc note: the present version of strtoul() has been
36 * simplified in that overflow checking has been removed.
37 * This simplification is needed for embedded systems in which
38 * there is no UNIX-style errno global variable.
39 */
40
41 #include <ctype.h>
42
43 /*
44 * Convert a string to an unsigned long integer.
45 *
46 * Ignores `locale' stuff. Assumes that the upper and lower case
47 * alphabets and digits are each contiguous.
48 */
49 unsigned long
50 strtoul(nptr, endptr, base)
51 const char *nptr;
52 char **endptr;
53 register int base;
54 {
55 register const char *s = nptr;
56 register unsigned long acc;
57 register int c;
58 register int neg = 0, any;
59
60 /*
61 * See strtol for comments as to the logic used.
62 */
63 do {
64 c = *s++;
65 } while (isspace(c));
66 if (c == '-') {
67 neg = 1;
68 c = *s++;
69 } else if (c == '+')
70 c = *s++;
71 if ((base == 0 || base == 16) &&
72 c == '0' && (*s == 'x' || *s == 'X')) {
73 c = s[1];
74 s += 2;
75 base = 16;
76 }
77 if (base == 0)
78 base = c == '0' ? 8 : 10;
79
80 for (acc = 0, any = 0;; c = *s++) {
81 if (isdigit(c))
82 c -= '0';
83 else if (isalpha(c))
84 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
85 else
86 break;
87 if (c >= base)
88 break;
89 any = 1;
90 acc *= base;
91 acc += c;
92 }
93 if (neg)
94 acc = -acc;
95 if (endptr != 0)
96 *endptr = (char *)(any ? s - 1 : nptr);
97 return (acc);
98 }