[openssh.git] / openbsd-compat / strtoll.c

/*-
 * Copyright (c) 1992 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. 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.
 */

/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoll.c */

#include "includes.h"
#ifndef HAVE_STRTOLL

#include <sys/types.h>

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

/*
 * Convert a string to a long long.
 *
 * Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
long long
strtoll(const char *nptr, char **endptr, int base)
{
	const char *s;
	long long acc, cutoff;
	int c;
	int neg, any, cutlim;

	/*
	 * Skip white space and pick up leading +/- sign if any.
	 * If base is 0, allow 0x for hex and 0 for octal, else
	 * assume decimal; if base is already 16, allow 0x.
	 */
	s = nptr;
	do {
		c = (unsigned char) *s++;
	} while (isspace(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')) {
		c = s[1];
		s += 2;
		base = 16;
	}
	if (base == 0)
		base = c == '0' ? 8 : 10;

	/*
	 * Compute the cutoff value between legal numbers and illegal
	 * numbers.  That is the largest legal value, divided by the
	 * base.  An input number that is greater than this value, if
	 * followed by a legal input character, is too big.  One that
	 * is equal to this value may be valid or not; the limit
	 * between valid and invalid numbers is then based on the last
	 * digit.  For instance, if the range for long longs is
	 * [-9223372036854775808..9223372036854775807] and the input base
	 * is 10, cutoff will be set to 922337203685477580 and cutlim to
	 * either 7 (neg==0) or 8 (neg==1), meaning that if we have
	 * accumulated a value > 922337203685477580, or equal but the
	 * next digit is > 7 (or 8), the number is too big, and we will
	 * return a range error.
	 *
	 * Set any if any `digits' consumed; make it negative to indicate
	 * overflow.
	 */
	cutoff = neg ? LLONG_MIN : LLONG_MAX;
	cutlim = cutoff % base;
	cutoff /= base;
	if (neg) {
		if (cutlim > 0) {
			cutlim -= base;
			cutoff += 1;
		}
		cutlim = -cutlim;
	}
	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
		if (isdigit(c))
			c -= '0';
		else if (isalpha(c))
			c -= isupper(c) ? 'A' - 10 : 'a' - 10;
		else
			break;
		if (c >= base)
			break;
		if (any < 0)
			continue;
		if (neg) {
			if (acc < cutoff || (acc == cutoff && c > cutlim)) {
				any = -1;
				acc = LLONG_MIN;
				errno = ERANGE;
			} else {
				any = 1;
				acc *= base;
				acc -= c;
			}
		} else {
			if (acc > cutoff || (acc == cutoff && c > cutlim)) {
				any = -1;
				acc = LLONG_MAX;
				errno = ERANGE;
			} else {
				any = 1;
				acc *= base;
				acc += c;
			}
		}
	}
	if (endptr != 0)
		*endptr = (char *) (any ? s - 1 : nptr);
	return (acc);
}
#endif /* HAVE_STRTOLL */
Commit	Line	Data
1e29a0c8	1	/*-
	2	* Copyright (c) 1992 The Regents of the University of California.
	3	* 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. 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
f6d4fb87	30	/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoll.c */
f6d4fb87	31
1e29a0c8	32	#include "includes.h"
	33	#ifndef HAVE_STRTOLL
	34
1e29a0c8	35	#include <sys/types.h>
	36
	37	#include <ctype.h>
	38	#include <errno.h>
	39	#include <limits.h>
	40	#include <stdlib.h>
	41
	42	/*
	43	* Convert a string to a long long.
	44	*
	45	* Ignores `locale' stuff. Assumes that the upper and lower case
	46	* alphabets and digits are each contiguous.
	47	*/
	48	long long
	49	strtoll(const char nptr, char *endptr, int base)
	50	{
	51	const char *s;
	52	long long acc, cutoff;
	53	int c;
	54	int neg, any, cutlim;
	55
	56	/*
	57	* Skip white space and pick up leading +/- sign if any.
	58	* If base is 0, allow 0x for hex and 0 for octal, else
	59	* assume decimal; if base is already 16, allow 0x.
	60	*/
	61	s = nptr;
	62	do {
	63	c = (unsigned char) *s++;
	64	} while (isspace(c));
	65	if (c == '-') {
	66	neg = 1;
	67	c = *s++;
	68	} else {
	69	neg = 0;
	70	if (c == '+')
	71	c = *s++;
	72	}
	73	if ((base == 0 \|\| base == 16) &&
	74	c == '0' && (s == 'x' \|\| s == 'X')) {
	75	c = s[1];
	76	s += 2;
	77	base = 16;
	78	}
	79	if (base == 0)
	80	base = c == '0' ? 8 : 10;
	81
	82	/*
	83	* Compute the cutoff value between legal numbers and illegal
	84	* numbers. That is the largest legal value, divided by the
	85	* base. An input number that is greater than this value, if
	86	* followed by a legal input character, is too big. One that
	87	* is equal to this value may be valid or not; the limit
	88	* between valid and invalid numbers is then based on the last
	89	* digit. For instance, if the range for long longs is
	90	* [-9223372036854775808..9223372036854775807] and the input base
	91	* is 10, cutoff will be set to 922337203685477580 and cutlim to
	92	* either 7 (neg==0) or 8 (neg==1), meaning that if we have
	93	* accumulated a value > 922337203685477580, or equal but the
	94	* next digit is > 7 (or 8), the number is too big, and we will
	95	* return a range error.
	96	*
	97	* Set any if any `digits' consumed; make it negative to indicate
	98	* overflow.
99	*/
100	cutoff = neg ? LLONG_MIN : LLONG_MAX;
101	cutlim = cutoff % base;
102	cutoff /= base;
103	if (neg) {
104	if (cutlim > 0) {
105	cutlim -= base;
106	cutoff += 1;
107	}
108	cutlim = -cutlim;
109	}
110	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
111	if (isdigit(c))
112	c -= '0';
113	else if (isalpha(c))
114	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
115	else
116	break;
117	if (c >= base)
118	break;
119	if (any < 0)
120	continue;
121	if (neg) {
122	if (acc < cutoff \|\| (acc == cutoff && c > cutlim)) {
123	any = -1;
124	acc = LLONG_MIN;
125	errno = ERANGE;
126	} else {
127	any = 1;
128	acc *= base;
129	acc -= c;
130	}
131	} else {
132	if (acc > cutoff \|\| (acc == cutoff && c > cutlim)) {
133	any = -1;
134	acc = LLONG_MAX;
135	errno = ERANGE;
136	} else {
137	any = 1;
138	acc *= base;
139	acc += c;
140	}
141	}
142	}
143	if (endptr != 0)
144	endptr = (char ) (any ? s - 1 : nptr);
145	return (acc);
146	}
147	#endif /* HAVE_STRTOLL */