hopefully fixing the rendering bugs

ke/TODO

@@ -1,4 +1,5 @@
 [ ] goto-line
 [ ] text-corruption bug
 [ ] alt-modifiers
-
+[ ] refresh-screen
+[ ] functions -> keymapping?

ke/erow.c

@@ -1,4 +1,5 @@
 #include <assert.h>
+#include <ctype.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -7,6 +8,30 @@
 #include "defs.h"
 
 
+static char
+byte_to_hihex(char c)
+{
+	c = (c >> 4) & 0xf;
+
+	if (c < 10) {
+		return c + 0x30;
+	}
+	return c + 0x41;
+}
+
+
+static char
+byte_to_lohex(char c)
+{
+	c &= 0x0f;
+
+	if (c < 10) {
+		return c + 0x30;
+	}
+	return c + 0x41;
+}
+
+
 int
 erow_render_to_cursor(struct erow *row, int cx)
 {
@@ -50,6 +75,7 @@ erow_update(struct erow *row)
 {
 	int	i = 0, j;
 	int	tabs = 0;
+	int	ctrl = 0;
 
 	/*
 	 * TODO(kyle): I'm not thrilled with this double-render.
@@ -57,12 +83,14 @@ erow_update(struct erow *row)
 	for (j = 0; j < row->size; j++) {
 		if (row->line[j] == '\t') {
 			tabs++;
+		} else if (!isprint(row->line[j])) {
+			ctrl++;
 		}
 	}
 
 	free(row->render);
 	row->render = NULL;
-	row->render = malloc(row->size + (tabs * (TAB_STOP-1)) + 1);
+	row->render = malloc(row->size + (tabs * (TAB_STOP-1)) + (ctrl * 3) + 1);
 	assert(row->render != NULL);
 
 	for (j = 0; j < row->size; j++) {
@@ -70,6 +98,10 @@ erow_update(struct erow *row)
 			do {
 				row->render[i++] = ' ';
 			} while ((i % TAB_STOP) != 0);
+		} else if (!isprint(row->line[j])) {
+			row->render[i++] = '\\';
+			row->render[i++] = byte_to_hihex(row->line[j]);
+			row->render[i++] = byte_to_lohex(row->line[j]);
 		} else {
 			row->render[i++] = row->line[j];
 		}

ke/main.c

@@ -102,6 +102,27 @@ get_winsz(int *rows, int *cols)
 }
 
 
+void
+goto_line()
+{
+	int	 lineno = 0;
+	char	*query = editor_prompt("Line: %s", NULL);
+
+	if (query == NULL) {
+		return;
+	}
+
+	lineno = atoi(query);
+	if (lineno < 1 || lineno >= editor->nrows) {
+		editor_set_status("Line number must be between 1 and %d.", editor->nrows);
+		return;
+	}
+
+	editor->cury = lineno;
+	editor->rowoffs = editor->nrows;
+}
+
+
 void
 delete_row(int at)
 {
@@ -175,7 +196,7 @@ insertch(int16_t c)
 		erow_insert(editor->nrows, "", 0);
 	}
 
-	row_insert_ch(&editor->row[editor->cury], editor->curx, c);
+	row_insert_ch(&editor->row[editor->cury], editor->curx, (char)(c & 0xff));
 	editor->curx++;
 	editor->dirty++;
 }
@@ -691,6 +712,9 @@ process_kcommand(int16_t c)
 			process_normal(DEL_KEY);			
 		}
 		break;
+	case CTRL_KEY('g'):
+		goto_line();
+		break;
 	case BACKSPACE:
 		while (editor->curx > 0) {
 			process_normal(BACKSPACE);