/*  File: d8.c 
	Program to compute d8 flow directions and slopes.

  
	This program provides the main() function for calling the 
	functions in setdir.c.  

*/
#include "gridio.h"

int setdird8(char *demfile, char *pointfile, char *slopefile);

void main(int argc,char **argv)
{
  char demfile[MAXLN], pointfile[MAXLN], slopefile[MAXLN];
  int err,nmain;
  char *ext;

   if(argc != 2)
    {  
       printf("Usage:\n %s filename\n",argv[0]);
       printf("The following are appended BEFORE\n");
       printf("the files are opened:\n");
       printf("fel    Flooded Elevation data\n");
       printf("p      D8 flow directions\n");
       printf("sd8    D8 slope data\n");
       exit(0);  
    }
    ext=strrchr(argv[1],'.');
    if(ext == NULL)
	{
	    strcpy(demfile,argv[1]);
	    strcpy(pointfile,argv[1]);
        strcpy(slopefile,argv[1]);
		strcat(demfile,"fel");
		strcat(pointfile,"p");
		strcat(slopefile,"sd8");
	}
	else
	{
		nmain=strlen(argv[1])-strlen(ext);
		strncpy(demfile,argv[1],nmain);
		strcat(demfile,"fel");
		strcat(demfile,ext);
		strncpy(pointfile,argv[1],nmain);
		strcat(pointfile,"p");
		strcat(pointfile,ext);
		strncpy(slopefile,argv[1],nmain);
		strcat(slopefile,"sd8");
		strcat(slopefile,ext);
	}
    if(err=setdird8(demfile, pointfile, slopefile) != 0)
        printf("setdird8 error %d\n",err);
}