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Annotation of XNU/osfmk/kern/sscanf.c, revision 1.1.1.1

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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