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

/* $OpenBSD: strtoll.c,v 1.6 2005/11/10 10:00:17 espie Exp $ */
/*-
 * 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
f97dc218	1	/* $OpenBSD: strtoll.c,v 1.6 2005/11/10 10:00:17 espie Exp $ */
1e29a0c8	2	/*-
	3	* Copyright (c) 1992 The Regents of the University of California.
	4	* All rights reserved.
	5	*
	6	* Redistribution and use in source and binary forms, with or without
	7	* modification, are permitted provided that the following conditions
	8	* are met:
	9	* 1. Redistributions of source code must retain the above copyright
	10	* notice, this list of conditions and the following disclaimer.
	11	* 2. Redistributions in binary form must reproduce the above copyright
	12	* notice, this list of conditions and the following disclaimer in the
	13	* documentation and/or other materials provided with the distribution.
	14	* 3. Neither the name of the University nor the names of its contributors
	15	* may be used to endorse or promote products derived from this software
	16	* without specific prior written permission.
	17	*
	18	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	19	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	20	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	21	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	22	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	23	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	24	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	25	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	26	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	27	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	28	* SUCH DAMAGE.
	29	*/
	30
f6d4fb87	31	/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoll.c */
f6d4fb87	32
1e29a0c8	33	#include "includes.h"
	34	#ifndef HAVE_STRTOLL
	35
1e29a0c8	36	#include <sys/types.h>
	37
	38	#include <ctype.h>
	39	#include <errno.h>
	40	#include <limits.h>
	41	#include <stdlib.h>
	42
	43	/*
	44	* Convert a string to a long long.
	45	*
	46	* Ignores `locale' stuff. Assumes that the upper and lower case
	47	* alphabets and digits are each contiguous.
	48	*/
	49	long long
	50	strtoll(const char nptr, char *endptr, int base)
	51	{
	52	const char *s;
	53	long long acc, cutoff;
	54	int c;
	55	int neg, any, cutlim;
	56
	57	/*
	58	* Skip white space and pick up leading +/- sign if any.
	59	* If base is 0, allow 0x for hex and 0 for octal, else
	60	* assume decimal; if base is already 16, allow 0x.
	61	*/
	62	s = nptr;
	63	do {
	64	c = (unsigned char) *s++;
	65	} while (isspace(c));
	66	if (c == '-') {
	67	neg = 1;
	68	c = *s++;
	69	} else {
	70	neg = 0;
	71	if (c == '+')
	72	c = *s++;
	73	}
	74	if ((base == 0 \|\| base == 16) &&
	75	c == '0' && (s == 'x' \|\| s == 'X')) {
	76	c = s[1];
	77	s += 2;
	78	base = 16;
	79	}
	80	if (base == 0)
	81	base = c == '0' ? 8 : 10;
	82
	83	/*
	84	* Compute the cutoff value between legal numbers and illegal
	85	* numbers. That is the largest legal value, divided by the
	86	* base. An input number that is greater than this value, if
	87	* followed by a legal input character, is too big. One that
	88	* is equal to this value may be valid or not; the limit
	89	* between valid and invalid numbers is then based on the last
	90	* digit. For instance, if the range for long longs is
	91	* [-9223372036854775808..9223372036854775807] and the input base
	92	* is 10, cutoff will be set to 922337203685477580 and cutlim to
	93	* either 7 (neg==0) or 8 (neg==1), meaning that if we have
	94	* accumulated a value > 922337203685477580, or equal but the
	95	* next digit is > 7 (or 8), the number is too big, and we will
	96	* return a range error.
	97	*
	98	* Set any if any `digits' consumed; make it negative to indicate
	99	* overflow.
100	*/
101	cutoff = neg ? LLONG_MIN : LLONG_MAX;
102	cutlim = cutoff % base;
103	cutoff /= base;
104	if (neg) {
105	if (cutlim > 0) {
106	cutlim -= base;
107	cutoff += 1;
108	}
109	cutlim = -cutlim;
110	}
111	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
112	if (isdigit(c))
113	c -= '0';
114	else if (isalpha(c))
115	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
116	else
117	break;
118	if (c >= base)
119	break;
120	if (any < 0)
121	continue;
122	if (neg) {
123	if (acc < cutoff \|\| (acc == cutoff && c > cutlim)) {
124	any = -1;
125	acc = LLONG_MIN;
126	errno = ERANGE;
127	} else {
128	any = 1;
129	acc *= base;
130	acc -= c;
131	}
132	} else {
133	if (acc > cutoff \|\| (acc == cutoff && c > cutlim)) {
134	any = -1;
135	acc = LLONG_MAX;
136	errno = ERANGE;
137	} else {
138	any = 1;
139	acc *= base;
140	acc += c;
141	}
142	}
143	}
144	if (endptr != 0)
145	endptr = (char ) (any ? s - 1 : nptr);
146	return (acc);
147	}
148	#endif /* HAVE_STRTOLL */