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

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

#include "includes.h"
#ifndef HAVE_STRTOLL

#if defined(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "$OpenBSD: strtoll.c,v 1.4 2005/03/30 18:51:49 pat Exp $";
#endif /* LIBC_SCCS and not lint */

#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
181e6f32	1	/* OPENBSD ORIGINAL: lib/libc/stdlib/strtoll.c */
	2
	3	/*-
	4	* Copyright (c) 1992 The Regents of the University of California.
	5	* All rights reserved.
	6	*
	7	* Redistribution and use in source and binary forms, with or without
	8	* modification, are permitted provided that the following conditions
	9	* are met:
	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.
	18	*
	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
	29	* SUCH DAMAGE.
	30	*/
	31
	32	#include "includes.h"
	33	#ifndef HAVE_STRTOLL
	34
	35	#if defined(LIBC_SCCS) && !defined(lint)
	36	static const char rcsid[] = "$OpenBSD: strtoll.c,v 1.4 2005/03/30 18:51:49 pat Exp $";
	37	#endif /* LIBC_SCCS and not lint */
	38
	39	#include <sys/types.h>
	40
	41	#include <ctype.h>
	42	#include <errno.h>
	43	#include <limits.h>
	44	#include <stdlib.h>
	45
	46	/*
	47	* Convert a string to a long long.
	48	*
	49	* Ignores `locale' stuff. Assumes that the upper and lower case
	50	* alphabets and digits are each contiguous.
	51	*/
	52	long long
	53	strtoll(const char nptr, char *endptr, int base)
	54	{
	55	const char *s;
	56	long long acc, cutoff;
	57	int c;
	58	int neg, any, cutlim;
	59
	60	/*
	61	* Skip white space and pick up leading +/- sign if any.
	62	* If base is 0, allow 0x for hex and 0 for octal, else
	63	* assume decimal; if base is already 16, allow 0x.
	64	*/
65	s = nptr;
66	do {
67	c = (unsigned char) *s++;
68	} while (isspace(c));
69	if (c == '-') {
70	neg = 1;
71	c = *s++;
72	} else {
73	neg = 0;
74	if (c == '+')
75	c = *s++;
76	}
77	if ((base == 0 \|\| base == 16) &&
78	c == '0' && (s == 'x' \|\| s == 'X')) {
79	c = s[1];
80	s += 2;
81	base = 16;
82	}
83	if (base == 0)
84	base = c == '0' ? 8 : 10;
85
86	/*
87	* Compute the cutoff value between legal numbers and illegal
88	* numbers. That is the largest legal value, divided by the
89	* base. An input number that is greater than this value, if
90	* followed by a legal input character, is too big. One that
91	* is equal to this value may be valid or not; the limit
92	* between valid and invalid numbers is then based on the last
93	* digit. For instance, if the range for long longs is
94	* [-9223372036854775808..9223372036854775807] and the input base
95	* is 10, cutoff will be set to 922337203685477580 and cutlim to
96	* either 7 (neg==0) or 8 (neg==1), meaning that if we have
97	* accumulated a value > 922337203685477580, or equal but the
98	* next digit is > 7 (or 8), the number is too big, and we will
99	* return a range error.
100	*
101	* Set any if any `digits' consumed; make it negative to indicate
102	* overflow.
103	*/
104	cutoff = neg ? LLONG_MIN : LLONG_MAX;
105	cutlim = cutoff % base;
106	cutoff /= base;
107	if (neg) {
108	if (cutlim > 0) {
109	cutlim -= base;
110	cutoff += 1;
111	}
112	cutlim = -cutlim;
113	}
114	for (acc = 0, any = 0;; c = (unsigned char) *s++) {
115	if (isdigit(c))
116	c -= '0';
117	else if (isalpha(c))
118	c -= isupper(c) ? 'A' - 10 : 'a' - 10;
119	else
120	break;
121	if (c >= base)
122	break;
123	if (any < 0)
124	continue;
125	if (neg) {
126	if (acc < cutoff \|\| (acc == cutoff && c > cutlim)) {
127	any = -1;
128	acc = LLONG_MIN;
129	errno = ERANGE;
130	} else {
131	any = 1;
132	acc *= base;
133	acc -= c;
134	}
135	} else {
136	if (acc > cutoff \|\| (acc == cutoff && c > cutlim)) {
137	any = -1;
138	acc = LLONG_MAX;
139	errno = ERANGE;
140	} else {
141	any = 1;
142	acc *= base;
143	acc += c;
144	}
145	}
146	}
147	if (endptr != 0)
148	endptr = (char ) (any ? s - 1 : nptr);
149	return (acc);
150	}
151	#endif /* HAVE_STRTOLL */