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Commit	Line	Data
	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	* 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	#if defined(LIBC_SCCS) && !defined(lint)
	35	static char sccsid[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93";
	36	#endif /* LIBC_SCCS and not lint */
	37	#include <sys/cdefs.h>
	38	__FBSDID("$FreeBSD: src/lib/libc/stdlib/strtoumax.c,v 1.8 2002/09/06 11:23:59 tjr Exp $");
	39
	40	#include <ctype.h>
	41	#include <errno.h>
	42	#include <stdlib.h>
	43	#include <inttypes.h>
	44
	45	/*
	46	* Convert a string to a uintmax_t integer.
	47	*
	48	* Assumes that the upper and lower case
	49	* alphabets and digits are each contiguous.
	50	*/
	51	uintmax_t
	52	strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
	53	{
	54	const char *s;
	55	uintmax_t acc;
	56	char c;
	57	uintmax_t cutoff;
	58	int neg, any, cutlim;
	59
	60	/*
	61	* See strtoimax for comments as to the logic used.
	62	*/
	63	s = nptr;
	64	do {
	65	c = *s++;
	66	} while (isspace((unsigned char)c));
	67	if (c == '-') {
	68	neg = 1;
	69	c = *s++;
	70	} else {
	71	neg = 0;
	72	if (c == '+')
	73	c = *s++;
	74	}
	75	if ((base == 0 \|\| base == 16) &&
	76	c == '0' && (s == 'x' \|\| s == 'X')) {
	77	c = s[1];
	78	s += 2;
	79	base = 16;
	80	}
	81	if (base == 0)
	82	base = c == '0' ? 8 : 10;
	83	acc = any = 0;
	84	if (base < 2 \|\| base > 36)
	85	goto noconv;
	86
	87	cutoff = UINTMAX_MAX / base;
	88	cutlim = UINTMAX_MAX % base;
	89	for ( ; ; c = *s++) {
	90	if (c >= '0' && c <= '9')
	91	c -= '0';
	92	else if (c >= 'A' && c <= 'Z')
	93	c -= 'A' - 10;
	94	else if (c >= 'a' && c <= 'z')
	95	c -= 'a' - 10;
	96	else
	97	break;
	98	if (c >= base)
	99	break;
	100	if (any < 0 \|\| acc > cutoff \|\| (acc == cutoff && c > cutlim))
	101	any = -1;
	102	else {
	103	any = 1;
	104	acc *= base;
	105	acc += c;
	106	}
	107	}
	108	if (any < 0) {
	109	acc = UINTMAX_MAX;
	110	errno = ERANGE;
	111	} else if (!any) {
	112	noconv:
	113	errno = EINVAL;
	114	} else if (neg)
	115	acc = -acc;
	116	if (endptr != NULL)
	117	endptr = (char )(any ? s - 1 : nptr);
	118	return (acc);
	119	}