Return to strtoul.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / ntp / lib / isc

Annotation of embedaddon/ntp/lib/isc/strtoul.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
        !             3:  * Copyright (C) 2003  Internet Software Consortium.
        !             4:  *
        !             5:  * Permission to use, copy, modify, and/or distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
        !            10:  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
        !            11:  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
        !            12:  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            13:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
        !            14:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
        !            15:  * PERFORMANCE OF THIS SOFTWARE.
        !            16:  */
        !            17: 
        !            18: /*
        !            19:  * Copyright (c) 1990, 1993
        !            20:  *     The Regents of the University of California.  All rights reserved.
        !            21:  *
        !            22:  * Redistribution and use in source and binary forms, with or without
        !            23:  * modification, are permitted provided that the following conditions
        !            24:  * are met:
        !            25:  * 1. Redistributions of source code must retain the above copyright
        !            26:  *    notice, this list of conditions and the following disclaimer.
        !            27:  * 2. Redistributions in binary form must reproduce the above copyright
        !            28:  *    notice, this list of conditions and the following disclaimer in the
        !            29:  *    documentation and/or other materials provided with the distribution.
        !            30:  * 3. All advertising materials mentioning features or use of this software
        !            31:  *    must display the following acknowledgement:
        !            32:  *     This product includes software developed by the University of
        !            33:  *     California, Berkeley and its contributors.
        !            34:  * 4. Neither the name of the University nor the names of its contributors
        !            35:  *    may be used to endorse or promote products derived from this software
        !            36:  *    without specific prior written permission.
        !            37:  *
        !            38:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            39:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            40:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            41:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            42:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            43:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            44:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            45:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            46:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            47:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            48:  * SUCH DAMAGE.
        !            49:  */
        !            50: 
        !            51: /*! \file */
        !            52: #if defined(LIBC_SCCS) && !defined(lint)
        !            53: static char sccsid[] = "@(#)strtoul.c  8.1 (Berkeley) 6/4/93";
        !            54: #endif /* LIBC_SCCS and not lint */
        !            55: 
        !            56: /* $Id: strtoul.c,v 1.7 2007/06/19 23:47:17 tbox Exp $ */
        !            57: 
        !            58: #include <config.h>
        !            59: 
        !            60: #include <limits.h>
        !            61: #include <ctype.h>
        !            62: #include <errno.h>
        !            63: 
        !            64: #include <isc/stdlib.h>
        !            65: #include <isc/util.h>
        !            66: 
        !            67: /*!
        !            68:  * Convert a string to an unsigned long integer.
        !            69:  *
        !            70:  * Ignores `locale' stuff.  Assumes that the upper and lower case
        !            71:  * alphabets and digits are each contiguous.
        !            72:  */
        !            73: unsigned long
        !            74: isc_strtoul(const char *nptr, char **endptr, int base) {
        !            75:        const char *s = nptr;
        !            76:        unsigned long acc;
        !            77:        unsigned char c;
        !            78:        unsigned long cutoff;
        !            79:        int neg = 0, any, cutlim;
        !            80: 
        !            81:        /*
        !            82:         * See strtol for comments as to the logic used.
        !            83:         */
        !            84:        do {
        !            85:                c = *s++;
        !            86:        } while (isspace(c));
        !            87:        if (c == '-') {
        !            88:                neg = 1;
        !            89:                c = *s++;
        !            90:        } else if (c == '+')
        !            91:                c = *s++;
        !            92:        if ((base == 0 || base == 16) &&
        !            93:            c == '0' && (*s == 'x' || *s == 'X')) {
        !            94:                c = s[1];
        !            95:                s += 2;
        !            96:                base = 16;
        !            97:        }
        !            98:        if (base == 0)
        !            99:                base = c == '0' ? 8 : 10;
        !           100:        cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
        !           101:        cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
        !           102:        for (acc = 0, any = 0;; c = *s++) {
        !           103:                if (!isascii(c))
        !           104:                        break;
        !           105:                if (isdigit(c))
        !           106:                        c -= '0';
        !           107:                else if (isalpha(c))
        !           108:                        c -= isupper(c) ? 'A' - 10 : 'a' - 10;
        !           109:                else
        !           110:                        break;
        !           111:                if (c >= base)
        !           112:                        break;
        !           113:                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
        !           114:                        any = -1;
        !           115:                else {
        !           116:                        any = 1;
        !           117:                        acc *= base;
        !           118:                        acc += c;
        !           119:                }
        !           120:        }
        !           121:        if (any < 0) {
        !           122:                acc = ULONG_MAX;
        !           123:                errno = ERANGE;
        !           124:        } else if (neg)
        !           125:                acc = -acc;
        !           126:        if (endptr != 0)
        !           127:                DE_CONST(any ? s - 1 : nptr, *endptr);
        !           128:        return (acc);
        !           129: }