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Annotation of XNU/osfmk/kern/sscanf.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * @OSF_FREE_COPYRIGHT@
        !            24:  */
        !            25: /*
        !            26:  * HISTORY
        !            27:  * 
        !            28:  * Revision 1.1.1.1  1998/09/22 21:05:32  wsanchez
        !            29:  * Import of Mac OS X kernel (~semeria)
        !            30:  *
        !            31:  * Revision 1.1.1.1  1998/03/07 02:25:56  wsanchez
        !            32:  * Import of OSF Mach kernel (~mburg)
        !            33:  *
        !            34:  * Revision 1.1.8.2  1997/02/12  12:52:33  stephen
        !            35:  *     New file, reimplemented to be sure of copyright status
        !            36:  *     Initially only supports character matching and '%d'
        !            37:  *     [1997/02/12  12:43:09  stephen]
        !            38:  *
        !            39:  * $EndLog$
        !            40:  */
        !            41: 
        !            42: #include <stdarg.h>
        !            43: #include <kern/misc_protos.h>
        !            44: 
        !            45: #define isdigit(c) ((unsigned) ((c) - '0') < 10U)
        !            46: 
        !            47: /*
        !            48:  * Scan items from a string in accordance with a format.  This is much
        !            49:  * simpler than the C standard function: it only recognises %d without a
        !            50:  * field width, and does not treat space in the format string or the
        !            51:  * input any differently from other characters.  The return value is the
        !            52:  * number of characters from the input string that were successfully
        !            53:  * scanned, not the number of format items matched as in standard sscanf.
        !            54:  * [email protected], 12 Feb 97
        !            55:  */
        !            56: int
        !            57: sscanf(const char *str, const char *format, ...)
        !            58: {
        !            59:        const char *start = str;
        !            60:        va_list args;
        !            61:        
        !            62:        va_start(args, format);
        !            63:        for ( ; *format != '\0'; format++) {
        !            64:                if (*format == '%' && format[1] == 'd') {
        !            65:                        int positive;
        !            66:                        int value;
        !            67:                        int *valp;
        !            68:                        
        !            69:                        if (*str == '-') {
        !            70:                                positive = 0;
        !            71:                                str++;
        !            72:                        } else
        !            73:                                positive = 1;
        !            74:                        if (!isdigit(*str))
        !            75:                                break;
        !            76:                        value = 0;
        !            77:                        do {
        !            78:                                value = (value * 10) - (*str - '0');
        !            79:                                str++;
        !            80:                        } while (isdigit(*str));
        !            81:                        if (positive)
        !            82:                                value = -value;
        !            83:                        valp = va_arg(args, int *);
        !            84:                        *valp = value;
        !            85:                        format++;
        !            86:                } else if (*format == *str) {
        !            87:                        str++;
        !            88:                } else
        !            89:                        break;
        !            90:        }
        !            91:        va_end(args);
        !            92:        return str - start;
        !            93: }

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