substring()

#include <stdio.h>
#include <string.h>


size_t substring( char * dst, const char * src, size_t start, size_t len )
{
    size_t dstlen = len;
    size_t srclen = strlen(src);

    if( start + len > srclen )
        dstlen = srclen;

    memcpy( dst, &src[start], dstlen );

    dst[ dstlen ] = '\0';

    return dstlen;
}


int main( int argc, char * argv[] )
{
    char origem[] = "algoritmo";
    char destino[64];

    /* Testando... */

    substring( destino, origem, 0, 4 );
    printf( "substring( 0, 4 ) --> %s\n", destino );

    substring( destino, origem, 4, 5 );
    printf( "substring( 5, 5 ) --> %s\n", destino );

    substring( destino, origem, 3, 3 );
    printf( "substring( 3, 3 ) --> %s\n", destino );

    return 0;
}

/* fim-de-arquivo */