1 files changed, 184 insertions, 0 deletions
diff --git a/structures.c b/structures.c
new file mode 100644
index 0000000..e8d42dd
--- /dev/null
+++ b/structures.c
@@ -0,0 +1,184 @@
+#include <assert.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#define BUF_LEN 1024
+#define MAX_GRPS 50
+
+typedef struct entry{
+	char name[BUF_LEN];
+	char path[BUF_LEN];
+	struct entry *next;
+} ENTRY;
+
+typedef struct group{
+	char name[BUF_LEN];
+	char path[BUF_LEN];
+	struct entry *head;
+	struct entry *tail;
+	struct group *next;
+} GROUP;
+
+void check_line(char *buffer);
+ENTRY *create_entry(char *new_path, char *new_group);
+GROUP *create_group(char *new_path);
+void group_add(char *gname, ENTRY *addme);
+
+GROUP *groups_head;
+GROUP *gp; //pointer to remember last group that was looked at
+
+int main(){
+	FILE *fp;
+	char buffer[BUF_LEN];
+
+	fp = fopen("config", "r");
+	assert(fp != NULL);
+
+	while(fgets(buffer, BUF_LEN, fp)){
+		check_line(buffer);
+	}
+
+	//DEBUG: test to see if the list was added to properly
+	GROUP *gtrav = groups_head;
+	ENTRY *etrav;
+	while(gtrav != NULL){
+		etrav = gtrav->head;
+		while(etrav != NULL){
+			printf("%s, from group %s\n", etrav->name, gtrav->name);
+			etrav = etrav->next;
+		}
+		gtrav = gtrav->next;
+	}
+
+	return 0;
+}
+
+void check_line(char *buffer){
+	char *delims = " \t\n";
+	char *tok = strtok(buffer, delims);
+	DIR *dp;
+	struct dirent *entry;
+	ENTRY *new;
+
+	//add a path to the entry list
+	//TODO add potential dash functions
+	//TODO account for spaces in file name
+	if(!(strcmp(tok, "add"))){
+		tok = strtok(NULL, delims);
+		new = create_entry(tok, NULL);
+		if(new != NULL) group_add(tok, new);
+	}
+
+	//recursively add entries from a directory
+	if(!(strcmp(tok, "addDir"))){
+		tok = strtok(NULL, delims);
+		dp = opendir(tok);
+
+		//check if the directory is valid
+		if(dp == NULL) printf("Error: Invalid Directory \"%s\"\n", tok);
+
+		else{
+			while((entry = readdir(dp))){
+				//only add if its a file (d_type = 8)
+				if(entry->d_type == 8){
+					new = create_entry(entry->d_name, tok);
+					if(new != NULL) group_add(tok, new);
+				}
+			}
+		}
+
+		//TODO add option to also add files from directories inside directory (-r)
+
+		closedir(dp);
+	}
+
+	return;
+}
+
+ENTRY *create_entry(char *new_path, char *new_group){
+	ENTRY *new;
+	char full_path[BUF_LEN] = "";
+
+	if(new_group != NULL) strcat(full_path, new_group);
+	strcat(full_path, new_path);
+
+	//check if file exists
+	if(access(full_path, F_OK) == -1){
+		printf("Error: Invalid File Name \"%s\"\n", full_path);
+		return NULL;
+	}
+
+	new = malloc(sizeof(ENTRY));
+
+	strcpy(new->name, new_path);
+	strcpy(new->path, full_path);
+	new->next = NULL;
+
+	return new;
+}
+
+GROUP *create_group(char *new_path){
+	GROUP *new = malloc(sizeof(GROUP));
+
+	strcpy(new->name, new_path); //by default, group name is equivalent to the path
+	strcpy(new->path, new_path);
+	new->head = NULL;
+	new->tail = NULL;
+	new->next = NULL;
+
+	return new;
+}
+
+//FIXME maybe make this function part of a seperate file to handle a tree (AVL?)
+//for now, simple linked list implementation
+void group_add(char *gname, ENTRY *addme){
+	int i;
+	bool new_group = false; //do we need to create a new group?
+	GROUP *new;
+	GROUP *last = NULL; //last element in an existing group list (NULL to start)
+
+	//The previous group is not the same as the new group to add to
+	if(!(gp != NULL && (!(strcmp(gp->name, gname)) || !(strcmp(gp->path, gname))))){
+		gp = groups_head;
+		while(gp != NULL){
+			//gname matches groups[i]'s name or path, add entry here
+			if(!(strcmp(gp->name, gname)) || !(strcmp(gp->path, gname))) break;
+
+			last = gp;
+			gp = gp->next;
+		}
+	}
+
+	//was unable to find a matching existing group
+	if(gp == NULL) new_group = true;
+
+	//need to create new group to insert the entry into
+	if(new_group){
+		new = create_group(gname);
+
+		//first group
+		if(last == NULL) groups_head = new;
+
+		//add to the end of the groups
+		else last->next = new;
+
+		gp = new;
+	}
+
+	//add the entry to the list of entries in the group
+	if(gp->head == NULL){
+		gp->head = addme;
+		gp->tail = addme;
+	}
+
+	else{
+		gp->tail->next = addme;
+		gp->tail = addme;
+	}
+
+	return;
+}