#import <Cocoa/Cocoa.h> #import

int main(void) { NSAutoreleasePool *pool = [NSAutoreleasePool new];

NSFileHandle *stdinHandle = [NSFileHandle fileHandleWithStandardInput]; NSLog(@”reading…”); NSData *data = [stdinHandle readDataToEndOfFile]; NSString *str = [[[NSString alloc] initWithData:data encoding:NSMacOSRomanStringEncoding] autorelease];

NSScanner *scanner = [NSScanner scannerWithString:str]; NSString *qString = @”q”; NSCharacterSet *qCharSet = [NSCharacterSet characterSetWithCharactersInString:qString];

clock_t before, after; double delta;

NSLog(@”scanning…”);

before = clock(); while([scanner scanUpToCharactersFromSet:qCharSet intoString:nil]) [scanner scanCharactersFromSet:qCharSet intoString:nil]; after = clock(); delta = after; delta -= before; delta /= CLOCKS_PER_SEC; NSLog(@”with character set: %f”, delta);

//rewind [scanner setScanLocation:0U];

before = clock(); while([scanner scanUpToString:qString intoString:nil]) [scanner scanString:qString intoString:nil]; after = clock(); delta = after; delta -= before; delta /= CLOCKS_PER_SEC; NSLog(@”with string: %f”, delta);

//rewind [scanner setScanLocation:0U];

//I added a second charset test to be sure my results (see below) weren’t the result of caching. –boredzo before = clock(); while([scanner scanUpToCharactersFromSet:qCharSet intoString:nil]) [scanner scanCharactersFromSet:qCharSet intoString:nil]; after = clock(); delta = after; delta -= before; delta /= CLOCKS_PER_SEC; NSLog(@”with character set: %f”, delta);

[pool release]; return 0; }

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on a 450 M’Hz MPC7400 (G4 Cube) running 10.3.5:

make scan %/Volumes/RAM Disk(0) gcc scan.m -framework Cocoa -o scan -std=c99 __ du -h ~/Documents/big-headers.txt %/Volumes/RAM Disk(0) 36M ~/Documents/big-headers.txt __ scan < ~/Documents/big-headers.txt %/Volumes/RAM Disk(0) 2004-09-17 11:28:17.773 scan[1358] reading… 2004-09-17 11:28:18.586 scan[1358] scanning… 2004-09-17 11:28:29.292 scan[1358] with character set: 8.710000 2004-09-17 11:28:30.752 scan[1358] with string: 1.200000 2004-09-17 11:28:42.678 scan[1358] with character set: 8.610000

–boredzo