#include <stdio.h>
#include <windows.h>

typedef int (*USCS4CB)( char t[21], char r[12], char b[66] );

int main(int argc, char *argv[]) {
    HINSTANCE hinstLib;
    USCS4CB fp;
    char track[21];
    char route[12];
    char bar[66];
    int rc;

    if( argc != 3 ) {
        fprintf( stderr, "usage: %s trackcode(20) routecode(11)\n", argv[0] );
        exit( -3 );
    }
    
    if( hinstLib = LoadLibrary( TEXT("usps4cb") ) ){
        if( !( fp = (USCS4CB) GetProcAddress( hinstLib, "USPS4CB" ) ) ) {
            fprintf( stderr, 
                "Couldn't obtain proc addr for USCS4CB(); rc:%x\n", 
                GetLastError() 
            );
            exit( -5 );
        }
    }
    else {
        fprintf( stderr, "Couldn't load USCS4CB.dll; rc %x\n", GetLastError() );
        exit( -4 );
    }

    if( strlen( argv[ 1 ] ) != 20 ) {
        fprintf( stderr, "Param 1 (Track code) not 20 digits\n" );
        exit( -1 );
    }
    memcpy( track, argv[1], 20 );
    track[20] = '\0';

    if( strlen( argv[ 2 ] ) != 11 ) {
        fprintf( stderr, "Param 2 (Route code) not 11 digits\n" );
        exit( -2 );
    }
    memcpy( route, argv[2], 11 );
    route[11] = '\0';

    memset( bar, 0,  sizeof( bar) ); 

    if( rc = (fp)( track, route, bar ) ) {
        fprintf( stderr, "USPS4CB failed with rc:%d\n", rc );
        exit( rc );
    }
    printf( bar );
    return 0;
}

/*

C:\test>cl 663116.c
Microsoft (R) 32-bit C/C++ Standard Compiler Version 13.00.9466 for 80x86
Copyright (C) Microsoft Corporation 1984-2001. All rights reserved.

663116.c
Microsoft (R) Incremental Linker Version 7.00.9466
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:663116.exe
663116.obj

C:\test>.\663116
usage: .\663116 trackcode(20) routecode(11)

C:\test>.\663116 3070202120200000001 27203643012
Param 1 (Track code) not 20 digits

C:\test>.\663116 30702021202000000001 2720364302
Param 2 (Route code) not 11 digits

C:\test>.\663116 30702021202000000001 27203643012
ATTDAATFADDDTDDTFTFFADADFDTDDAFTATTAAATAAFTFADFDTTTFADAFDDATDDTFT

*/