1 files changed, 88 insertions, 0 deletions
diff --git a/src/common.c b/src/common.c
new file mode 100644
index 0000000..92bd467
--- /dev/null
+++ b/src/common.c
@@ -0,0 +1,88 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include "structs.h"
+#include "common.h"
+
+struct data * input(char fp[]){
+	int i,j;
+	FILE *f;
+	struct data * d = (struct data *)malloc(sizeof(struct data));
+
+	f = fopen(fp,"r");
+	j = fscanf(f,"%ld",&(d->N));
+	if(j!=1){
+		printf("Error reading data\n");
+		exit(0);
+	}
+	d->items = (struct item *)malloc(d->N*sizeof(struct item));
+	for(i=0;i<d->N;++i){
+		j = fscanf(f,"%lf %lf",&(d->items[i].p),&(d->items[i].w));
+		d->allp += d->items[i].p;
+		d->allw += d->items[i].w;
+	}
+
+	fclose(f);
+	return d;
+}
+
+int cmp_items_ratio(const void * a, const void * b){
+  struct item c = *(struct item *)a;
+  struct item d = *(struct item *)b;
+  if(c.p / c.w < d.p / d.w){
+    return 1;
+  }
+	return -1;
+}
+
+void print_data(struct data * d){
+	int i;
+	printf("### PRINTING DATA - BEGINNING ###\n");
+	printf("N:\t%ld\n\n",d->N);
+	printf("Profit\tWeight\n");
+	for(i=0;i<d->N;++i){
+		printf("%.02f\t%.02f\n",d->items[i].p,d->items[i].w);
+	}
+	printf("### PRINTING DATA - ENDING ###\n");
+}
+
+void print_front(struct front_item * b){
+	while(b!=NULL){
+		printf("%.02f\t%.02f\n",b->i.p,b->i.w);
+		b = b->next;
+	}
+}
+
+void free_data(struct data * d){
+	free(d->items);
+	free(d);
+}
+
+void free_front(struct front_item * b){
+	struct front_item * tmp;
+	for(;b!=NULL;){
+		tmp = b;
+		b = b->next;
+		free(tmp);
+	}
+}
+
+struct front_item * new_front_item(double p, double w, struct front_item * prev, struct front_item * next){
+	struct front_item * f = (struct front_item *)malloc(sizeof(struct front_item));
+	f->i.p = p;
+	f->i.w = w;
+	f->next = next;
+	f->prev = prev;
+
+	return f;
+}
+
+double dist_items(struct item * a, struct item * b){
+	return sqrt((a->p - b->p)*(a->p - b->p) + (a->w - b->w)*(a->w - b->w));
+}
+
+int len_front(struct front_item * f){
+	int N;
+	for(N=0;f!=NULL;f=f->next,N++);
+	return N;
+}