FreeCalypso > hg > freecalypso-tools
comparison target-utils/libc/strtol.c @ 96:d8d03dafb9c0
target-utils/libc: strtol and strtoul added from 4.4BSD with simplification
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 31 Oct 2016 23:35:48 +0000 |
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95:3670e7768ab6 | 96:d8d03dafb9c0 |
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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 strtol() 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 a long integer. | |
45 * | |
46 * Ignores `locale' stuff. Assumes that the upper and lower case | |
47 * alphabets and digits are each contiguous. | |
48 */ | |
49 long | |
50 strtol(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 * Skip white space and pick up leading +/- sign if any. | |
62 * If base is 0, allow 0x for hex and 0 for octal, else | |
63 * assume decimal; if base is already 16, allow 0x. | |
64 */ | |
65 do { | |
66 c = *s++; | |
67 } while (isspace(c)); | |
68 if (c == '-') { | |
69 neg = 1; | |
70 c = *s++; | |
71 } else if (c == '+') | |
72 c = *s++; | |
73 if ((base == 0 || base == 16) && | |
74 c == '0' && (*s == 'x' || *s == 'X')) { | |
75 c = s[1]; | |
76 s += 2; | |
77 base = 16; | |
78 } | |
79 if (base == 0) | |
80 base = c == '0' ? 8 : 10; | |
81 | |
82 for (acc = 0, any = 0;; c = *s++) { | |
83 if (isdigit(c)) | |
84 c -= '0'; | |
85 else if (isalpha(c)) | |
86 c -= isupper(c) ? 'A' - 10 : 'a' - 10; | |
87 else | |
88 break; | |
89 if (c >= base) | |
90 break; | |
91 any = 1; | |
92 acc *= base; | |
93 acc += c; | |
94 } | |
95 if (neg) | |
96 acc = -acc; | |
97 if (endptr != 0) | |
98 *endptr = (char *)(any ? s - 1 : nptr); | |
99 return (acc); | |
100 } |