1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1992, 1993
5 *    The Regents of the University of California.  All rights reserved.
6 *
7 * Copyright (c) 2011 The FreeBSD Foundation
8 *
9 * Portions of this software were developed by David Chisnall
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "from @(#)strtoul.c    8.1 (Berkeley) 6/4/93";
39#endif /* LIBC_SCCS and not lint */
40// #include <sys/cdefs.h>
41// __FBSDID("$FreeBSD$");
42
43#include <ctype.h>
44#include <errno.h>
45#include <stdlib.h>
46#include <inttypes.h>
47// #include "xlocale_private.h"
48
49/*
50 * Convert a string to a uintmax_t integer.
51 *
52 * Assumes that the upper and lower case
53 * alphabets and digits are each contiguous.
54 */
55uintmax_t
56strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base)
57{
58    const char *s;
59    uintmax_t acc;
60    char c;
61    uintmax_t cutoff;
62    int neg, any, cutlim;
63    // FIX_LOCALE(locale);
64
65    /*
66     * See strtoimax for comments as to the logic used.
67     */
68    s = nptr;
69    do {
70        c = *s++;
71    } while (isspace((unsigned char)c));
72    if (c == '-') {
73        neg = 1;
74        c = *s++;
75    } else {
76        neg = 0;
77        if (c == '+') {
78            c = *s++;
79        }
80    }
81    if ((base == 0 || base == 16) &&
82        c == '0' && (*s == 'x' || *s == 'X') &&
83        ((s[1] >= '0' && s[1] <= '9') ||
84        (s[1] >= 'A' && s[1] <= 'F') ||
85        (s[1] >= 'a' && s[1] <= 'f'))) {
86        c = s[1];
87        s += 2;
88        base = 16;
89    }
90    if (base == 0) {
91        base = c == '0' ? 8 : 10;
92    }
93    acc = any = 0;
94    if (base < 2 || base > 36) {
95        goto noconv;
96    }
97
98    cutoff = UINTMAX_MAX / base;
99    cutlim = UINTMAX_MAX % base;
100    for (;; c = *s++) {
101        if (c >= '0' && c <= '9') {
102            c -= '0';
103        } else if (c >= 'A' && c <= 'Z') {
104            c -= 'A' - 10;
105        } else if (c >= 'a' && c <= 'z') {
106            c -= 'a' - 10;
107        } else {
108            break;
109        }
110        if (c >= base) {
111            break;
112        }
113        if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) {
114            any = -1;
115        } else {
116            any = 1;
117            acc *= base;
118            acc += c;
119        }
120    }
121    if (any < 0) {
122        acc = UINTMAX_MAX;
123        errno = ERANGE;
124    } else if (!any) {
125noconv:
126        errno = EINVAL;
127    } else if (neg) {
128        acc = -acc;
129    }
130    if (endptr != NULL) {
131        *endptr = (char *)(any ? s - 1 : nptr);
132    }
133    return (acc);
134}
135uintmax_t
136strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
137{
138    return strtoumax_l(nptr, endptr, base);
139}
140