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1 /* $NetBSD: strtoimax.c,v 1.4 2005/11/29 03:12:00 christos Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <LibConfig.h>
32 #include <sys/EfiCdefs.h>
33 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid
[] = "from: @(#)strtoq.c 8.1 (Berkeley) 6/4/93";
37 __RCSID("$NetBSD: strtoimax.c,v 1.4 2005/11/29 03:12:00 christos Exp $");
39 #endif /* LIBC_SCCS and not lint */
41 #include "namespace.h"
50 __weak_alias(strtoimax
, _strtoimax
)
54 * Convert a string to an intmax_t.
56 * Ignores `locale' stuff. Assumes that the upper and lower case
57 * alphabets and digits are each contiguous.
60 _strtoimax(const char *nptr
, char **endptr
, int base
)
67 _DIAGASSERT(nptr
!= NULL
);
68 /* endptr may be NULL */
71 /* This outrageous construct just to shut up a GCC warning. */
72 (void) &acc
; (void) &cutoff
;
76 * Skip white space and pick up leading +/- sign if any.
77 * If base is 0, allow 0x for hex and 0 for octal, else
78 * assume decimal; if base is already 16, allow 0x.
82 c
= (unsigned char) *s
++;
92 if ((base
== 0 || base
== 16) &&
93 c
== '0' && (*s
== 'x' || *s
== 'X')) {
99 base
= c
== '0' ? 8 : 10;
102 * Compute the cutoff value between legal numbers and illegal
103 * numbers. That is the largest legal value, divided by the
104 * base. An input number that is greater than this value, if
105 * followed by a legal input character, is too big. One that
106 * is equal to this value may be valid or not; the limit
107 * between valid and invalid numbers is then based on the last
108 * digit. For instance, if the range for intmax_t is
109 * [-9223372036854775808..9223372036854775807] and the input base
110 * is 10, cutoff will be set to 922337203685477580 and cutlim to
111 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
112 * accumulated a value > 922337203685477580, or equal but the
113 * next digit is > 7 (or 8), the number is too big, and we will
114 * return a range error.
116 * Set any if any `digits' consumed; make it negative to indicate
119 cutoff
= neg
? INTMAX_MIN
: INTMAX_MAX
;
120 cutlim
= (int)(cutoff
% base
);
129 for (acc
= 0, any
= 0;; c
= (unsigned char) *s
++) {
133 c
-= isupper(c
) ? 'A' - 10 : 'a' - 10;
141 if (acc
< cutoff
|| (acc
== cutoff
&& c
> cutlim
)) {
151 if (acc
> cutoff
|| (acc
== cutoff
&& c
> cutlim
)) {
163 *endptr
= (char *)(any
? s
- 1 : nptr
);
164 //*endptr = __UNCONST(any ? s - 1 : nptr);