projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
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 | } |