tcp_friendliness.c

这个代码是tcl程序

#include<stdio.h>
#include<string.h>

double get_one_number(char *key, char *filename)
{
   FILE *file;
   double result;
   char line[1024];
   
   result = 0;
   file = fopen(filename, "rt");
   if (file==0){
     printf("No file: %s\n", filename);
     return 0;
   }
   while(!feof(file))
   {
     if (fgets(line, sizeof(line), file)==0)
       break;
     if (strstr(line, key)>0)
     {
       sscanf(&(line[strlen(key)]), "%lf", &result);
       break;
     }  
   }
   if (result==0)
   {
     printf("WARNING: %s\n%s", filename, line);
   }
   fclose(file);
   return result;
}


void run()
{
	char file[]="report.txt";
	char key[256];
	int i;
	double highspeed, tcp;
   
	highspeed=0;
	for(i=0;i<4;i++){
		sprintf(key, "class %i: second-half throughput (Mbps) =", i);
		highspeed += get_one_number(key, file);     
	}
	tcp=0;
	for(i=1000;i<1004;i++){
		sprintf(key, "class %i: second-half throughput (Mbps) =", i);
		tcp += get_one_number(key, file);     
	}
	printf("%.2f\n", tcp/highspeed);
}	  

int main(int argc, char **argv)
{
	printf("%s ", argv[1]);
	run();
	return 0;
}