/*
	speed.c - mrq, 2000
	calculates the speed of a connection (in terms of bytes)
	given a speed in bits.
	
	for example:

	1mbit
	512kbit
	1gbit
	
*/
#include <stdio.h>
#include <stdlib.h>


#define T_GIG (1073741824)
#define T_MEG (1048576)
#define T_K (1024)
#define T_BYTE (8)

double bytespersec;

typedef struct {
	char text[32];
	char desc[32];
	double multiplier;
} wordT;

wordT word[10];
long numwords = 0;

void setword (char *txt, double mult, char *desc) {
	strcpy(word[numwords].text, txt);
	strcpy(word[numwords].desc, desc);
	word[numwords].multiplier = mult;
	numwords++;
}

void calctime(double howmuch, char *description) {
	long num;
	num =  howmuch / bytespersec;

	printf("Time to transfer %s:     ", description);
	if (num > 0) {
		if (num > 86400) {
			printf("%ld days, ", num / 86400);
			num = num % 86400;
		}
		if (num > 3600) {
			printf("%ld hours, ", num / 3600);
			num = num % 3600;
		}
		if (num > 60) {
			printf("%ld mins, ", num / 60);
			num = num % 60;
		}
		printf("%ld secs\n", num);
	} else {
		printf("under a second\n");
	}

}

int main(int argc, char **argv) {
	char buf[1024];
	char desc[32];
	char *endchar;
	int i;
	double multiplier;

	if (argc < 2) {
		printf("enter speed: ");
		fgets(buf, sizeof(buf), stdin);
	} else {
		strcpy(buf, "");
		for (i = 1; i < argc; i++) {
			strcat(buf, argv[i]);
			if (i < (argc - 1)) {
				strcat(buf, " ");
			}
		}
	}

	setword("gigabit", T_GIG,"gbit");
	setword("gbit", T_GIG,"gbit");
	setword("gig", T_GIG,"gbit");
	setword("gb", T_GIG,"gbit");


	setword("megabit", T_MEG,"mbit");
	setword("mbit", T_MEG,"mbit");
	setword("meg", T_MEG,"mbit");
	setword("mb", T_MEG,"mbit");

	setword("kilobit", T_K,"kbit");
	setword("kbit", T_K,"kbit");
	setword("kb", T_K,"kbit");
	setword("k", T_K,"kbit");

	setword("baud", 1,"baud");
	setword("b", 1,"baud");

	endchar = NULL;
	
	for (i = 0; i < numwords; i++) {
		if (strstr(buf, word[i].text)) {
			endchar = (char *)strstr(buf, word[i].text);
			multiplier = word[i].multiplier;
			strcpy(desc, word[i].desc);
			break;
		}
	}

	if (!endchar) {
		if ((buf[strlen(buf)-1] == '\n') || (buf[strlen(buf)-1] == '\r')) {
 			buf[strlen(buf)-1] = '\0'; /* get rid of trailing newline */
		}
		printf("assuming that speed entered is in bits per sec (%s baud)\n",buf);
		strcpy(desc, "baud");
		multiplier = 1;
	} else {
		*endchar = '\0';
	}

	bytespersec = atof(buf);

	printf("\n%0.2f %s = ", bytespersec,desc);

	bytespersec *= multiplier;
	bytespersec /= T_BYTE;

	if (bytespersec < T_K ) {
		printf("%0.2f bytes/sec", bytespersec);
	} else if (bytespersec < T_MEG) {
		printf("%0.2f kilobytes/sec", bytespersec / T_K);
	} else if (bytespersec < T_GIG) {
		printf("%0.2f megabytes/sec", bytespersec / T_MEG);
	} else {
		printf("%0.2f gigabytes/sec", bytespersec / T_GIG);
	}
	printf("\n\n");

	/* figure out how long it would take for various amounts of data */
	calctime(T_K*100, "100k");
	calctime(T_MEG, "1 meg");
	calctime(T_MEG * 650, "650 meg (1 cdrom)");
	calctime(T_GIG, "1 gig");

}