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git01.mediatek.com / filogic / atf / 8d69a03f6a7db3c437b7cfdd15402627277d8cb4 / . / lib / non-semihosting / strtoull.c
blob: e46ef4ce44d6c246d6a2e1db1cfe1fa95a8a2c5e [file] [log] [blame]
Achin Gupta4f6ad662013-10-25 09:08:21 +0100[diff] [blame]1/*-
2 * Copyright (c) 1992, 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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * Portions copyright (c) 2009-2013, ARM Ltd. All rights reserved.
32 * ---------------------------------------------------------------
33 * File: lib/strtoull.c
34 */
35
36#include "types.h"
37#include "ctype.h"
38#include "limits.h"
39
40/*
41 * Convert a string to an unsigned long long integer.
42 *
43 * Assumes that the upper and lower case
44 * alphabets and digits are each contiguous.
45 */
46static unsigned long long
47bsd_strtoull(const char *nptr, char **endptr, int base)
48{
49 const char *s;
50 unsigned long long acc;
51 char c;
52 unsigned long long cutoff;
53 int neg, any, cutlim;
54
55 /*
56 * See strtoq for comments as to the logic used.
57 */
58 s = nptr;
59 do {
60 c = *s++;
61 } while (isspace((unsigned char)c));
62 if (c == '-') {
63 neg = 1;
64 c = *s++;
65 } else {
66 neg = 0;
67 if (c == '+')
68 c = *s++;
69 }
70 if ((base == 0 || base == 16) &&
71 c == '0' && (*s == 'x' || *s == 'X') &&
72 ((s[1] >= '0' && s[1] <= '9') ||
73 (s[1] >= 'A' && s[1] <= 'F') ||
74 (s[1] >= 'a' && s[1] <= 'f'))) {
75 c = s[1];
76 s += 2;
77 base = 16;
78 }
79 if (base == 0)
80 base = c == '0' ? 8 : 10;
81 acc = any = 0;
82
83 cutoff = ULLONG_MAX / base;
84 cutlim = ULLONG_MAX % base;
85 for ( ; ; c = *s++) {
86 if (c >= '0' && c <= '9')
87 c -= '0';
88 else if (c >= 'A' && c <= 'Z')
89 c -= 'A' - 10;
90 else if (c >= 'a' && c <= 'z')
91 c -= 'a' - 10;
92 else
93 break;
94 if (c >= base)
95 break;
96 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
97 any = -1;
98 else {
99 any = 1;
100 acc *= base;
101 acc += c;
102 }
103 }
104 if (any < 0) {
105 acc = ULLONG_MAX;
106 } else if (neg)
107 acc = -acc;
108 if (endptr != NULL)
109 *endptr = (char *)(any ? s - 1 : nptr);
110 return (acc);
111}
112
113int strict_strtoull(const char *str, unsigned int base, long long *result)
114{
115 *result = bsd_strtoull(str, NULL, base);
116 return 0;
117}