程序代码：

// vfdff@ vc6.0下编译测试通过

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *u_basename(char *s)
{
    int i = 0;
    for (i = strlen(s); i>=0; i--)
    {
        if ((s[i]=='\\') || (s[i]=='/'))
        {
            break;
        }
    }
    return &(s[i+1]);
}
int u_dirname(char *dest, char *src)
{
    int i = 0;
  
    for (i = strlen(src); i>=0; i--)
    {
        if ((src[i]=='\\') || (src[i]=='/'))
        {
            break;
        }
    }
    memcpy(dest, src, i+1);
    dest[i+1] = 0;
    return 0;
}
main()
{
    char *s1="c:\\Welcome\\To\\Beijing.txt";
    char *s2="c:/Welcome/To/Beijing.txt";
    char *s3="Beijing.txt";
    char path[80];
  
    printf( u_basename(s1) );
    printf("\n");
    printf( u_basename(s2) );
    printf("\n");
    printf( u_basename(s3) );
    printf("\n");
   

    u_dirname(path, s1);
    printf( "%s\n",path );
    u_dirname(path, s2);
    printf( "%s\n",path );
    u_dirname(path, s3);
    printf( "%s\n",path );

    return 0;
}