From df4c240e8eb30e520469fdaee2042e04adc854e3 Mon Sep 17 00:00:00 2001
From: "John Ankarstr\\xf6m" <john@ankarstrom.se>
Date: Mon, 31 May 2021 20:54:54 +0200
Subject: Add 'da' utility

---
 da.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 da.c

(limited to 'da.c')

diff --git a/da.c b/da.c
new file mode 100644
index 0000000..6f1b511
--- /dev/null
+++ b/da.c
@@ -0,0 +1,43 @@
+/*
+ *  da prints the device attributes of the current terminal
+ *  to standard output as a string of comma-separated integers.
+ *
+ *  If run inside GNU screen, it will print the device attributes
+ *  of GNU screen itself and not those of the real terminal.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <termios.h>
+#include <unistd.h>
+
+int
+main()
+{
+	char c;
+	int r, ttyfd;
+	struct termios term, restore;
+
+        if((ttyfd = open("/dev/tty", O_RDWR))==-1)
+                err(1, "open");
+
+        tcgetattr(ttyfd, &restore);
+        tcgetattr(ttyfd, &term);
+        term.c_lflag &= ~(ICANON|ECHO);
+        tcsetattr(ttyfd, TCSANOW, &term);
+
+	write(ttyfd, "\033[>c", 4);
+	while(r = read(ttyfd, &c, 1)){
+		if(r==-1){
+			warn("read");
+			goto end;
+		}
+		if(c=='c') break;
+		printf("%d,", c);
+	}
+	printf("99\n");
+
+end:
+        tcsetattr(ttyfd, TCSANOW, &restore);
+}
-- 
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