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Annotation of Gnu-Mach/util/atoi.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Mach Operating System
        !             3:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !             4:  * All Rights Reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software and its
        !             7:  * documentation is hereby granted, provided that both the copyright
        !             8:  * notice and this permission notice appear in all copies of the
        !             9:  * software, derivative works or modified versions, and any portions
        !            10:  * thereof, and that both notices appear in supporting documentation.
        !            11:  *
        !            12:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            13:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            14:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            15:  *
        !            16:  * Carnegie Mellon requests users of this software to return to
        !            17:  *
        !            18:  *  Software Distribution Coordinator  or  [email protected]
        !            19:  *  School of Computer Science
        !            20:  *  Carnegie Mellon University
        !            21:  *  Pittsburgh PA 15213-3890
        !            22:  *
        !            23:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            24:  * the rights to redistribute these changes.
        !            25:  */
        !            26: /*
        !            27:  *     Olivetti Mach Console driver v0.0
        !            28:  *     Copyright Ing. C. Olivetti & C. S.p.A. 1988, 1989
        !            29:  *     All rights reserved.
        !            30:  *
        !            31:  */
        !            32: /*
        !            33:   Copyright 1988, 1989 by Olivetti Advanced Technology Center, Inc.,
        !            34: Cupertino, California.
        !            35: 
        !            36:                All Rights Reserved
        !            37: 
        !            38:   Permission to use, copy, modify, and distribute this software and
        !            39: its documentation for any purpose and without fee is hereby
        !            40: granted, provided that the above copyright notice appears in all
        !            41: copies and that both the copyright notice and this permission notice
        !            42: appear in supporting documentation, and that the name of Olivetti
        !            43: not be used in advertising or publicity pertaining to distribution
        !            44: of the software without specific, written prior permission.
        !            45: 
        !            46:   OLIVETTI DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
        !            47: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
        !            48: IN NO EVENT SHALL OLIVETTI BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
        !            49: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            50: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
        !            51: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUR OF OR IN CONNECTION
        !            52: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            53: */
        !            54: 
        !            55: /*
        !            56:   Copyright 1988, 1989 by Intel Corporation, Santa Clara, California.
        !            57: 
        !            58:                All Rights Reserved
        !            59: 
        !            60: Permission to use, copy, modify, and distribute this software and
        !            61: its documentation for any purpose and without fee is hereby
        !            62: granted, provided that the above copyright notice appears in all
        !            63: copies and that both the copyright notice and this permission notice
        !            64: appear in supporting documentation, and that the name of Intel
        !            65: not be used in advertising or publicity pertaining to distribution
        !            66: of the software without specific, written prior permission.
        !            67: 
        !            68: INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
        !            69: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
        !            70: IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
        !            71: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            72: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
        !            73: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
        !            74: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            75: */
        !            76: 
        !            77: #include <util/atoi.h>
        !            78: 
        !            79: /*
        !            80:  * mach_atoi:
        !            81:  *
        !            82:  *     This function converts an ascii string into an integer, and returns
        !            83:  *     MACH_ATOI_DEFAULT if no integer was found.  Note that this is why we
        !            84:  *     don't use the regular atio(), because ZERO is ZERO and not the
        !            85:  *     MACH_ATOI_DEFAULT in all cases.
        !            86:  *
        !            87:  * input       : string
        !            88:  * output      : a number or possibly MACH_ATOI_DEFAULT, and the count of
        !            89:  *                characters consumed by the conversion
        !            90:  *
        !            91:  */
        !            92: int
        !            93: mach_atoi(cp, nump)
        !            94: u_char *cp;
        !            95: int    *nump;
        !            96: {
        !            97:        int     number;
        !            98:        u_char  *original;
        !            99: 
        !           100:        original = cp;
        !           101:        for (number = 0; ('0' <= *cp) && (*cp <= '9'); cp++)
        !           102:                number = (number * 10) + (*cp - '0');
        !           103:        if (original == cp)
        !           104:                *nump = MACH_ATOI_DEFAULT;
        !           105:        else
        !           106:                *nump = number;
        !           107:        return(cp - original);
        !           108: }

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