From 94f1c52e676e0590eba761946002ad50f3346e5c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sat, 7 Nov 2020 00:16:30 +0100
Subject: add stdin support

---
 l.c | 61 +++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 41 insertions(+), 20 deletions(-)

diff --git a/l.c b/l.c
index 53a1dbe..bbc5081 100644
--- a/l.c
+++ b/l.c
@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/ioctl.h>
 #include <sys/ttydefaults.h>
 #include <termios.h>
@@ -15,16 +16,13 @@
 #define prn(...) dprintf(ttyfd, __VA_ARGS__)
 #define rerr(...) do { raw(false); err(__VA_ARGS__); } while (0)
 
-char *lines[3] = {
-	"line 1",
-	"line 2",
-	"line 3"
-};
+char **lines;
+int lines_c;
+int lines_s;
 
 int current = -1; /* currently selected item */
-int height = 3; /* height of output in rows */
-int ttyfd;
 int x, y; /* original cursor position in cols, rows */
+int ttyfd;
 	
 /* enable/disable "raw" mode */
 void raw(bool enable) {
@@ -88,7 +86,7 @@ int cpr(int *x, int *y) {
 
 /* select item */
 int item(int n) {
-	if (n < 1 || n > height) return -1;
+	if (n < 1 || n > lines_c) return -1;
 	if (current != -1)
 		prn("%s", lines[current - 1]);
 	current = n;
@@ -106,15 +104,45 @@ int right() {}
 int left() {}
 
 int main() {
-	char c, *p, *phrase;
-	int i, r;
+	char c, *line, *p, *phrase, *tmp;
+	int i, line_s, r;
 	struct winsize w;
-
 	phrase = NULL;
 
 	ttyfd = open("/dev/tty", O_RDWR);
 	if (ttyfd == -1) rerr(1, "open");
 
+	/* read from standard input */
+
+	line_s = 100;
+	line = malloc((line_s + 1) * sizeof(char));
+	if (line == NULL) err(1, "malloc");
+
+	lines_c = 0;
+	lines_s = 50;
+	lines = malloc(lines_s * sizeof(char *));
+	if (lines == NULL) err(1, "malloc");
+
+	i = 0;
+	while (read(STDIN_FILENO, &c, 1) != 0) {
+		if (c == '\n') {
+			line[i] = '\0';
+			lines[lines_c] = malloc((strlen(line) + 1) * sizeof(char));
+			if (lines[lines_c] == NULL) err(1, "malloc");
+			strcpy(lines[lines_c], line);
+			lines_c++;
+			i = 0;
+		} else {
+			if (i > line_s) {
+				line_s += 50;
+				tmp = realloc(line, (line_s + 1) * sizeof(char));
+				if (tmp == NULL) err(1, "realloc");
+				line = tmp;
+			}
+			line[i++] = c;
+		}
+	}
+
 	raw(true);
 
 	/* save original cursor position */
@@ -125,22 +153,15 @@ int main() {
 	}
 
 	/* print output */
-	for (i = 0; i < height; i++)
+	for (i = 0; i < lines_c; i++)
 		prn("%s\r\n", lines[i]);
 
-	/* get height of output */
-	/*
-	p = ex - 1;
-	height = 0;
-	while (*(++p) != '\0')
-		if (*p == '\n') height++;
-
 	/* get height of terminal */
 	r = ioctl(ttyfd, TIOCGWINSZ, &w);
 	if (r == -1) rerr(1, "ioctl");
 
 	/* correct cursor position if original cursor was near bottom */
-	r = y + height - w.ws_row;
+	r = y + lines_c - w.ws_row;
 	if (r > 0)
 		y = y - r;
 
-- 
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