#include <inc/lib.h>

int bol = 1;
int line = 0;

void
num(int f, char *s)
{
	long n;
	int r;
	char c;

	while((n=read(f, &c, 1))>0){
		if(bol){
			fprintf(1, "%5d ", ++line);
			bol = 0;
		}
		if((r=write(1, &c, 1))!=1)
			panic("write error copying %s: %e", s, r);
		if(c == '\n')
			bol = 1;
	}
	if(n < 0)
		panic("error reading %s: %e", s, n);
}

void
umain(int argc, char **argv)
{
	int f, i;

	argv0 = "num";
	if(argc == 1)
		num(0, "<stdin>");
	else for(i=1; i<argc; i++){
		f = open(argv[i], O_RDONLY);
		if(f < 0)
			panic("can't open %s: %e", argv[i], f);
		else{
			num(f, argv[i]);
			close(f);
		}
	}
	exit();
}