/*  time-stat -- a trivial utility to calculate the dt stats from nsec(poke) info*/ #include <u.h>#include <stdio.h>#include <libc.h> #define MAXSTR 256#define MAXTAG 32#define MAXENT 32 int chatty = 0;char *mppath; typedef struct Ent Ent;struct Ent {	char tag[MAXSTR];	vlong tstamp;}; Ent ent[MAXENT]; static voidusage(void){	fprint(2, "time-stat ...\n");	exits("usage");} /* data format:	char *   tag	vlong    time in nsec*/ voidprint_dt(int fd, Ent *e1, Ent *e2){	vlong dt = e1->tstamp - e2->tstamp;	double fdt = ((double)dt) / ((double)1000000000LL);	fprint(fd," %lld", dt);	fprint(fd," %f", fdt); 	fprint(fd," (%s-%s)", e1->tag, e2->tag);	fprint(fd,"\n");} voidmain(int argc, char *argv[]){	int i, n;	FILE *fin=nil;	FILE *fout=nil;	int fdout;	char *arg;	int list = 0; 	ARGBEGIN{	case 'l':		list = 1;		break;	case 'i':		arg=ARGF();		fin = fopen(arg, "r");		if(fin==nil){			fprint(2, "couldn't open input file %s\n", arg);			exits("open input file");		}		break;	case 'o':		arg=ARGF();		fout = fopen(arg, "w");		if(fout==nil){			fprint(2, "couldn't open output file %s\n", arg);			exits("open output file");		}		break;	default:		usage();	}ARGEND 	if(argc != 0)		usage(); 	if(fin==nil || fout==nil)		usage(); 	fdout = fileno(fout); 	/* read in the data */	for (i=0; i<MAXENT; i++){		char line[256];				n = fscanf(fin, "%s%s", ent[i].tag, line);		ent[i].tstamp = strtoll(line,nil,10);		if(n<=0)			break;	}	i--; 	if(i>=MAXENT){		fprint(2, "*error*: ran out of space\n");		exits("out of space");	} 	/* process what we have */	if(list)		for (n=0; n<=i; n++){			fprint(fdout,"%lld %s\n", ent[n].tstamp, ent[n].tag);		} 	/* process what we have */	for (n=1; n<=i; n++)		print_dt(fdout, &ent[n], &ent[n-1]); 	/* do the subtotal */	print_dt(fdout, &ent[i-1], &ent[0]); 	/* do the total */	print_dt(fdout, &ent[i], &ent[0]); 	fclose(fin);	fclose(fout);	exits(0);}