splitp.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

#include <string.h>
/*
 * @implemented
 */
void _splitpath(const char* path, char* drive, char* dir, char* fname, char* ext)
{
    const char* tmp_drive;
    const char* tmp_dir;
    const char* tmp_ext;

    tmp_drive = strchr(path,':');
    if (drive) {
	if (tmp_drive) {
	    strncpy(drive,tmp_drive-1,2);
	    *(drive+2) = 0;
	} else {
	    *drive = 0;
	}
    }
    if (!tmp_drive) {
	tmp_drive = path - 1;
    }

    tmp_dir = (char*)strrchr(path,'\\');
    if (dir) {
	if (tmp_dir) {
	    strncpy(dir,tmp_drive+1,tmp_dir-tmp_drive);
            *(dir+(tmp_dir-tmp_drive)) = 0;
	} else {
	    *dir =0;
	}
    }

    tmp_ext = strrchr(path,'.');
    if (!tmp_ext) {
	tmp_ext = path+strlen(path);
    }
    if (ext) {
        strcpy(ext,tmp_ext);
    }

    if (tmp_dir) {
        strncpy(fname,tmp_dir+1,tmp_ext-tmp_dir-1);
        *(fname+(tmp_ext-tmp_dir-1)) = 0;
    } else {
        strncpy(fname,tmp_drive+1,tmp_ext-tmp_drive-1);
        *(fname+(tmp_ext-path))=0;
    }
}