/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * @OSF_FREE_COPYRIGHT@ */ /* * HISTORY * * Revision 1.1.1.1 1998/09/22 21:05:32 wsanchez * Import of Mac OS X kernel (~semeria) * * Revision 1.1.1.1 1998/03/07 02:25:56 wsanchez * Import of OSF Mach kernel (~mburg) * * Revision 1.1.8.2 1997/02/12 12:52:33 stephen * New file, reimplemented to be sure of copyright status * Initially only supports character matching and '%d' * [1997/02/12 12:43:09 stephen] * * $EndLog$ */ #include <stdarg.h> #include <kern/misc_protos.h> #define isdigit(c) ((unsigned) ((c) - '0') < 10U) /* * Scan items from a string in accordance with a format. This is much * simpler than the C standard function: it only recognises %d without a * field width, and does not treat space in the format string or the * input any differently from other characters. The return value is the * number of characters from the input string that were successfully * scanned, not the number of format items matched as in standard sscanf. * e.mcmanus@opengroup.org, 12 Feb 97 */ int sscanf(const char *str, const char *format, ...) { const char *start = str; va_list args; va_start(args, format); for ( ; *format != '\0'; format++) { if (*format == '%' && format[1] == 'd') { int positive; int value; int *valp; if (*str == '-') { positive = 0; str++; } else positive = 1; if (!isdigit(*str)) break; value = 0; do { value = (value * 10) - (*str - '0'); str++; } while (isdigit(*str)); if (positive) value = -value; valp = va_arg(args, int *); *valp = value; format++; } else if (*format == *str) { str++; } else break; } va_end(args); return str - start; }