| | 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 | * e.mcmanus@opengroup.org, 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 | } |
projects / apple / xnu.git / blame_incremental