src/tiff/port/strtoull.c

/*-
 * Copyright (c) 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <limits.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>

/*
 * Convert a string to an unsigned long long integer.
 *
 * Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
unsigned long long
strtoull(const char *nptr, char **endptr, int base)
{
	const char *s;
	unsigned long long acc;
	char c;
	unsigned long long cutoff;
	int neg, any, cutlim;

	/*
	 * See strtoq for comments as to the logic used.
	 */
	s = nptr;
	do {
		c = *s++;
	} while (isspace((unsigned char)c));
	if (c == '-') {
		neg = 1;
		c = *s++;
	} else {
		neg = 0;
		if (c == '+')
			c = *s++;
	}
	if ((base == 0 || base == 16) &&
	    c == '0' && (*s == 'x' || *s == 'X') &&
	    ((s[1] >= '0' && s[1] <= '9') ||
	    (s[1] >= 'A' && s[1] <= 'F') ||
	    (s[1] >= 'a' && s[1] <= 'f'))) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = c == '0' ? 8 : 10;
	acc = any = 0;
	if (base < 2 || base > 36)
		goto noconv;

	cutoff = ULLONG_MAX / base;
	cutlim = ULLONG_MAX % base;
	for ( ; ; c = *s++) {
		if (c >= '0' && c <= '9')
			c -= '0';
		else if (c >= 'A' && c <= 'Z')
			c -= 'A' - 10;
		else if (c >= 'a' && c <= 'z')
			c -= 'a' - 10;
		else
			break;
		if (c >= base)
			break;
		if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
			any = -1;
		else {
			any = 1;
			acc *= base;
			acc += c;
		}
	}
	if (any < 0) {
		acc = ULLONG_MAX;
		errno = ERANGE;
	} else if (!any) {
noconv:
		errno = EINVAL;
	} else if (neg)
		acc = -acc;
	if (endptr != NULL)
		*endptr = (char *)(any ? s - 1 : nptr);
	return (acc);
}
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	#include <limits.h>
	35	#include <errno.h>
	36	#include <ctype.h>
	37	#include <stdlib.h>
	38
	39	/*
	40	* Convert a string to an unsigned long long integer.
	41	*
	42	* Assumes that the upper and lower case
	43	* alphabets and digits are each contiguous.
	44	*/
	45	unsigned long long
	46	strtoull(const char nptr, char *endptr, int base)
	47	{
	48	const char *s;
	49	unsigned long long acc;
	50	char c;
	51	unsigned long long cutoff;
	52	int neg, any, cutlim;
	53
	54	/*
	55	* See strtoq for comments as to the logic used.
	56	*/
	57	s = nptr;
	58	do {
	59	c = *s++;
	60	} while (isspace((unsigned char)c));
	61	if (c == '-') {
	62	neg = 1;
	63	c = *s++;
	64	} else {
	65	neg = 0;
	66	if (c == '+')
	67	c = *s++;
	68	}
	69	if ((base == 0 \|\| base == 16) &&
	70	c == '0' && (s == 'x' \|\| s == 'X') &&
	71	((s[1] >= '0' && s[1] <= '9') \|\|
	72	(s[1] >= 'A' && s[1] <= 'F') \|\|
	73	(s[1] >= 'a' && s[1] <= 'f'))) {
	74	c = s[1];
	75	s += 2;
	76	base = 16;
	77	}
	78	if (base == 0)
	79	base = c == '0' ? 8 : 10;
	80	acc = any = 0;
	81	if (base < 2 \|\| base > 36)
	82	goto noconv;
	83
	84	cutoff = ULLONG_MAX / base;
	85	cutlim = ULLONG_MAX % base;
	86	for ( ; ; c = *s++) {
	87	if (c >= '0' && c <= '9')
	88	c -= '0';
	89	else if (c >= 'A' && c <= 'Z')
	90	c -= 'A' - 10;
	91	else if (c >= 'a' && c <= 'z')
	92	c -= 'a' - 10;
	93	else
	94	break;
	95	if (c >= base)
	96	break;
	97	if (any < 0 \|\| acc > cutoff \|\| (acc == cutoff && c > cutlim))
	98	any = -1;
	99	else {
	100	any = 1;
	101	acc *= base;
	102	acc += c;
	103	}
	104	}
	105	if (any < 0) {
	106	acc = ULLONG_MAX;
	107	errno = ERANGE;
	108	} else if (!any) {
	109	noconv:
	110	errno = EINVAL;
	111	} else if (neg)
	112	acc = -acc;
	113	if (endptr != NULL)
	114	endptr = (char )(any ? s - 1 : nptr);
	115	return (acc);
	116	}