Refactored: created move functions, separate files for line and page structs, and added a makefile

line.c

@@ -0,0 +1,37 @@
+#include "line.h"
+
+// Insert char into string. 
+void insert_char(LINE *s, char c, int index)
+{
+	int i;
+
+	if(strlen(s->line) >= s->size - 2) expand(s);
+
+	for(i = strlen(s->line); i >= index; i--)
+		s->line[i + 1] = s->line[i];
+
+	s->line[index] = c;
+} // insert
+
+
+
+void remove_char(LINE *s, int index)
+{
+		int i;
+		int len = strlen(s->line);
+		for(i = index; i < len; i++)
+			s->line[i] = s->line[i + 1];
+} // remove_char
+
+
+
+// expands size of line
+void expand(LINE *s)
+{
+	int new_size = s->size * 2;
+	char *temp = (char *)malloc(new_size * sizeof(char));
+	strcpy(temp, s->line);
+	free(s->line);
+	s->line = temp;
+	s->size = new_size;	
+} // expand

line.h

@@ -0,0 +1,18 @@
+#ifndef LINE_H
+#define LINE_H
+/* LINE struct and functions */
+
+#include <string.h>
+#include <stdlib.h>
+
+typedef struct
+{
+	char *line;
+	int size; // size of array, not string
+} LINE;
+
+void insert_char(LINE *s, char c, int index); // inserts char to string
+void remove_char(LINE *s, int index);
+void expand(LINE *s); // doubles the size of the line
+
+#endif

makefile

@@ -0,0 +1,19 @@
+# makefile for text.c
+
+CXX=gcc
+CFLAGS=-Wall -g
+OBJS=line.o page.o
+LIBS=-lncurses
+
+text:	text.c text.h $(OBJS)
+	$(CXX) $(CFLAGS) -o text text.c $(OBJS) $(LIBS)
+	
+line.o: line.c line.h
+	$(CXX) $(CFLAGS) -c line.c
+	
+page.o: page.c page.h line.h
+	$(CXX) $(CFLAGS) -c page.c
+	
+clean:
+	rm -f $(OBJS) text
+

page.c

@@ -0,0 +1,71 @@
+#include "page.h"
+
+void init_page(PAGE *p)
+{
+	p->text = (LINE *)malloc(PAGE_SIZE * sizeof(LINE));
+
+	int i;
+	for(i = 0; i < PAGE_SIZE; i++)
+	{
+		p->text[i].line = (char *)malloc(LINE_SIZE * sizeof(char));
+		p->text[i].size = LINE_SIZE;
+	}
+	p->numlines = 0;
+} // init_page
+
+void dest_page(PAGE *p)
+{
+	int i;
+	for(i = 0; i < p->numlines; i++)
+	{
+		free(p->text[i].line);
+	}
+	free(p->text);
+} // dest_page
+
+
+
+// WARNING: Will not expand once the limit of 500 lines reached
+void insert_line(PAGE *p, int index)
+{	
+	LINE newline;
+	newline.line = (char *)malloc(LINE_SIZE * sizeof(char));
+	newline.line[0] = '\0';
+	
+	int i;
+
+	for(i = p->numlines - 1; i >= index; i--)
+		p->text[i + 1] = p->text[i];
+
+	p->text[index] = newline;
+} // insert_line
+
+
+
+void remove_line(PAGE *p, int index)
+{
+	if( p->numlines > 0 )
+	{
+		free(p->text[index].line);
+	
+		int i;
+		for(i = index; i < p->numlines - 1; i++)
+		{
+			p->text[i] = p->text[i + 1];
+		}
+		(p->numlines)--;
+	}
+} // remove_line
+
+void print_page(const PAGE *p, int start, int end)
+{
+	int i;
+	for(i = start; i < p->numlines && i < end; i++)
+	{
+		move(i, 1);
+		clrtoeol();
+		printw("%s", p->text[i].line);
+	}
+	refresh();
+}
+

page.h

@@ -0,0 +1,24 @@
+#ifndef PAGE_H
+#define PAGE_H
+/* PAGE struct definition and related functions */
+
+#include <ncurses.h> // might have to move this
+#include "line.h" 
+
+#define PAGE_SIZE 500 /* Max number of lines. Currently not expandable. */
+#define LINE_SIZE 128 /* Max characters in a line. Expandable */
+#define WIN_SIZE LINES - 2 /* Size of window, making room for bottom prompt */
+
+typedef struct
+{
+	LINE *text; // lines of text
+	int numlines;
+} PAGE;
+
+void init_page(PAGE *p);
+void dest_page(PAGE *p);
+void insert_line(PAGE *p, int index);
+void remove_line(PAGE *p, int index);
+void print_page(const PAGE *p, int start, int end);
+
+#endif

text.c

@@ -8,6 +8,8 @@
  *	-Loading	
  **/
  
+ // TODO: Create move_up, down, left, right functions
+
 int main(int argc, char *argv[])
 {
 	PAGE page;
@@ -17,6 +19,11 @@ int main(int argc, char *argv[])
 	{
 		load_file(argc, argv, &page);
 	}
+	else // initialize
+	{
+		page.text[0].line[0] = '\0';
+		page.numlines = 1;
+	}
 	
 	/* curses interface */
 	initscr();
@@ -31,6 +38,7 @@ int main(int argc, char *argv[])
 
 	int y, x;
 	getyx(stdscr, y, x);
+	//int yoffset = 0; // offset to account for screen scroll
 
 	while(true)
 	{
@@ -40,25 +48,20 @@ int main(int argc, char *argv[])
 			case KEY_F(4):
 				goto end;
 				break;
+			case KEY_F(5):
+				save_file(argc, argv, &page);
+				break;
 			case KEY_UP:
-				if( y > 0 ) --y;
+				move_up(&page, &x, &y);
-				if( x > strlen(page.text[y].line) + 1 ) // cursor adjusts to smaller
-					x = strlen(page.text[y].line) + 1;  // lines
-				move(y, x);
 				break;
 			case KEY_DOWN:
-				if( y < WIN_SIZE ) ++y;
+				move_down(&page, &x, &y);
-				if( x > strlen(page.text[y].line) + 1 )
-					x = strlen(page.text[y].line) + 1;
-				move(y, x);
 				break;
 			case KEY_LEFT:
-				if(x - 1 > 0)
+				move_left(&x, &y);
-					move(y, --x);
 				break;
 			case KEY_RIGHT:
-				if(x <= strlen(page.text[y].line))
+				move_right(&page, &x, &y);
-					move(y, ++x);
 				break;
 			case KEY_DC:
 			case 127: // backspace key...
@@ -66,26 +69,27 @@ int main(int argc, char *argv[])
 				if(page.text[y].line[x - 2] == '\0')
 				{
 					remove_line(&page, y);
-					if( y > 0 ) --y;
+					move_up(&page, &x, &y);
-					if( x > strlen(page.text[y].line) + 1 )
-						x = strlen(page.text[y].line) + 1;
 				}
 				else
 				{
 					remove_char(&page.text[y], x - 2); // why 2?
-					if( x > 0 ) x--;
+					move_left(&x, &y);
 				}
 				print_page(&page, 0, WIN_SIZE);
 				move(y, x);
-				refresh();
+				break;
+			case '\n': // newline
+				insert_line(&page, y + 1);
+				print_page(&page, 0, WIN_SIZE);
+				move_down(&page, &x, &y);
 				break;
 			default: // all other chars
 				if( isprint(ch) )
 				{
-					insert(&page.text[y], ch, x - 1);
+					insert_char(&page.text[y], ch, x - 1);
 					print_page(&page, 0, WIN_SIZE);
-					move(y, ++x);
+					move_right(&page, &x, &y);
-					refresh(); 
 				}
 		}
 	}
@@ -96,6 +100,31 @@ end:	endwin();
 	return EXIT_SUCCESS;
 } // main
 
+void move_left(int *x, int *y)
+{
+	if(*x - 1 > 0) move(*y, --(*x));
+}
+
+
+void move_right(PAGE *p, int *x, int *y)
+{
+	if(*x <= strlen(p->text[*y].line)) move(*y, ++(*x));
+}
+
+void move_up(PAGE *p, int *x, int *y)
+{
+	if( *y > 0 ) --(*y);
+	if( *x > strlen(p->text[*y].line) + 1 ) // cursor adjusts
+		*x = strlen(p->text[*y].line) + 1;  // to smaller lines
+	move(*y, *x);
+}
+void move_down(PAGE *p, int *x, int *y)
+{
+	if( *y < WIN_SIZE ) ++(*y);
+	if( *x > strlen(p->text[*y].line) + 1 )
+		*x = strlen(p->text[*y].line) + 1;
+	move(*y, *x);
+};
 
 void load_file(int argc, char **argv, PAGE *p)
 {
@@ -128,6 +157,7 @@ void save_file(int argc, char **argv, PAGE *p)
 		while(p->text[line].line[col] != '\0')
 		{
 			fputc(p->text[line].line[col], fp);
+			col++;
 		}
 		fputc('\n', fp);
 	}
@@ -136,85 +166,3 @@ void save_file(int argc, char **argv, PAGE *p)
 	fclose(fp);
 
 } // save_file
-
-void init_page(PAGE *p)
-{
-	p->text = (LINE *)malloc(PAGE_SIZE * sizeof(LINE));
-
-	int i;
-	for(i = 0; i < PAGE_SIZE; i++)
-	{
-		p->text[i].line = (char *)malloc(LINE_SIZE * sizeof(char));
-		p->text[i].size = LINE_SIZE;
-	}
-	p->numlines = 0;
-} // init_page
-
-void dest_page(PAGE *p)
-{
-	int i;
-	for(i = 0; i < p->numlines; i++)
-	{
-		free(p->text[i].line);
-	}
-	free(p->text);
-} // dest_page
-
-// Insert char into string. 
-void insert(LINE *s, char c, int index)
-{
-	int i;
-
-	if(strlen(s->line) >= s->size - 2) expand(s);
-
-	for(i = strlen(s->line); i >= index; i--)
-		s->line[i + 1] = s->line[i];
-
-	s->line[index] = c;
-} // insert
-
-// removes a char from line, if it's the last char '\0'
-// then it calls remove_line
-void remove_char(LINE *s, int index)
-{
-	//if(s->line[index] != '\0')
-	//{
-		int i;
-		int len = strlen(s->line);
-		for(i = index; i < len; i++)
-			s->line[i] = s->line[i + 1];
-	//}
-} // remove_char
-
-// expands size of line
-void expand(LINE *s)
-{
-	int new_size = s->size * 2;
-	char *temp = (char *)malloc(new_size * sizeof(char));
-	strcpy(temp, s->line);
-	free(s->line);
-	s->line = temp;
-	s->size = new_size;	
-} // expand
-
-void remove_line(PAGE *p, int index)
-{
-	free(p->text[index].line);
-	int i;
-	for(i = index; i < p->numlines - 1; i++)
-	{
-		p->text[i] = p->text[i + 1];
-	}
-	(p->numlines)--;
-} // remove_line
-
-void print_page(const PAGE *p, int start, int end)
-{
-	int i;
-	for(i = start; i < p->numlines && i < end; i++)
-	{
-		move(i, 1);
-		clrtoeol();
-		printw("%s ", p->text[i].line);
-	}
-}

text.h

@@ -2,35 +2,21 @@
 #define TEXT_H
 
 #include <stdio.h>
-#include <stdlib.h>
+#include <stdlib.h> // declared in line.h
 #include <ctype.h>
-#include <string.h>
+#include <string.h> // declared in line.h
-#include <ncurses.h> // -lncurses
+#include <ncurses.h> // -lncurses. declared in page.h
 
-#define PAGE_SIZE 500
+#include "page.h"
-#define LINE_SIZE 128
-#define WIN_SIZE LINES - 2
-
-typedef struct
-{
-	char *line;
-	int size; 
-} LINE;
-
-typedef struct
-{
-	LINE *text; // lines of text
-	int numlines;
-} PAGE;
 
 void load_file(int argc, char **argv, PAGE *p);
 void save_file(int argc, char **argv, PAGE *p);
-void init_page(PAGE *p);
+
-void dest_page(PAGE *p);
+void move_left(int *x, int *y);
-void insert(LINE *s, char c, int index); // inserts to string
+void move_right(PAGE *p, int *x, int *y);
-void remove_char(LINE *s, int index);
+void move_up(PAGE *p, int *x, int *y);
-void remove_line(PAGE *p, int index);
+void move_down(PAGE *p, int *x, int *y);
-void expand(LINE *s);
+
-void print_page(const PAGE *p, int start, int end);
 
 #endif
+