GraphRead.c

/** Helper function for Ass2 (COMP2521)
    Written By Zain Afzal 
**/

#include "Graph.h"
#include "GraphRead.h"
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>


Graph readGraph(char* file) {
	// ugly count!
	FILE * f = fopen(file , "r");
	if(!f){
		fprintf(stderr, "ERROR READING FILE %s\n", file);
		return NULL;
	}
	int lines = 0;
	char ch = 0;
	while(!feof(f)){ch = fgetc(f); if(ch == '\n')lines++;}
	fclose(f);

	//ugly parse!
	f = fopen(file , "r");
	if(!f){
		fprintf(stderr, "ERROR READING FILE %s\n", file);
		return NULL;
	}
	int a=0;
	int b=0;
	int c=0;
	int i = 0;
	int maxVert = -1;
	int **nums = malloc(sizeof(int*)*lines);
	for(i=0;i<lines;i++) nums[i] = malloc(sizeof(int)*3);
	i=0;
	while(i < lines) {
		fscanf(f, "%d,", &a);
		fscanf(f, "%d,", &b);
		fscanf(f, "%d", &c);
		if (a > maxVert) maxVert = a;
		if (b > maxVert) maxVert = b;
		nums[i][0] = a;
		nums[i][1] = b;
		nums[i][2] = c;
		i++;
	}
	fclose(f);

	Graph g = newGraph(maxVert+1);
	i = 0;
	while(i < lines) {
		insertEdge(g,nums[i][0],nums[i][1],nums[i][2]);
		i++;
	}
	for(i=0;i<lines;i++) free(nums[i]);
	free(nums);
	return g;
}