Re: NSString bug with test and really dodgy patch.

[Ibadinov Marat]

On Oct 3, 2012, at 12:19 PM, Jens Ayton wrote:
> 
> In summary, "figure out what Cocoa does." :-)
> 

Under OSX 10.6.8 it misbehaves badly with wide strings, but has no hard 
feelings about char arrays (not terminated by \0);

I've got following output:

2012-10-03 15:51:34.667 printf[3894:903] abcd
кириллица
2012-10-03 15:51:34.671 printf[3894:903] –∫–∏—Ä–∏–
2012-10-03 15:51:34.671 printf[3894:903] –
2012-10-03 15:51:34.672 printf[3894:903] –
кириллица
кири?
кириллица


For the program: 


#import <Foundation/Foundation.h>
#include "wchar.h"

static
void test_string(const char *cstr, int precision) 
{
    char *array = malloc(strlen(cstr));
    memcpy(array, cstr, strlen(cstr));
    
    NSLog(@"%@", [NSString stringWithFormat:@"%.*s", precision, array]);
}

static
void test_string_long(const wchar_t *wcstr, int precision) 
{
    wchar_t *array = malloc(wcslen(wcstr) * sizeof(wchar_t));
    memcpy(array, wcstr, wcslen(wcstr) * sizeof(wchar_t));
    
    NSLog(@"%@", [NSString stringWithFormat:@"%.*ls", precision, array]);
}

static
void test_printf_long(const wchar_t *wcstr, int precision) 
{
    wchar_t *array = malloc(wcslen(wcstr) * sizeof(wchar_t));
    memcpy(array, wcstr, wcslen(wcstr) * sizeof(wchar_t));
    
    printf("%.*ls\n", precision, array);
}


int main (int argc, const char * argv[])
{

    @autoreleasepool {
        
        test_string("abcd", 4);
        
        printf("%s\n", "кириллица");
        test_string("кириллица", 9);
        
        wchar_t *wcstr = L"кириллица";
        
        test_string_long(wcstr, 9);
        
        NSLog(@"%@", [NSString stringWithFormat:@"%ls", wcstr]);
        
        printf("%ls\n", wcstr);
        
        test_printf_long(wcstr, 9);
        
        test_printf_long(wcstr, 18);
        
    }
    return 0;
}

I presume there is no need to test Apple's Foundation behavior with surrogate 
UTF-16 pairs.
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