From 596a41139c08e172459d28fba0584f8ef6f576b5 Mon Sep 17 00:00:00 2001
From: "John Ankarstr\\xf6m" <john@ankarstrom.se>
Date: Sat, 5 Jun 2021 01:50:21 +0200
Subject: Set title on path change (safely)

---
 Makefile    |   6 ++--
 noice.c     |   5 +++
 safetitle.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 safetitle.h |   1 +
 safetitle.o | Bin 0 -> 2452 bytes
 5 files changed, 113 insertions(+), 3 deletions(-)
 create mode 100644 safetitle.c
 create mode 100644 safetitle.h
 create mode 100644 safetitle.o

diff --git a/Makefile b/Makefile
index bb84dd0..461937e 100644
--- a/Makefile
+++ b/Makefile
@@ -7,9 +7,9 @@ MANPREFIX = $(PREFIX)/man
 #CFLAGS = -g
 LDLIBS = -lcurses
 
-DISTFILES = noice.c strlcat.c strlcpy.c util.h config.def.h\
+DISTFILES = noice.c strlcat.c strlcpy.c safetitle.h util.h config.def.h\
     noice.1 Makefile README LICENSE
-OBJ = noice.o strlcat.o strlcpy.o
+OBJ = noice.o strlcat.o strlcpy.o safetitle.o
 BIN = noice
 
 all: $(BIN)
@@ -17,7 +17,7 @@ all: $(BIN)
 $(BIN): $(OBJ)
 	$(CC) $(CFLAGS) -o $@ $(OBJ) $(LDFLAGS) $(LDLIBS)
 
-noice.o: util.h config.h
+noice.o: safetitle.h util.h config.h
 strlcat.o: util.h
 strlcpy.o: util.h
 
diff --git a/noice.c b/noice.c
index 4340ab7..68485db 100644
--- a/noice.c
+++ b/noice.c
@@ -19,6 +19,7 @@
 #include <string.h>
 #include <unistd.h>
 
+#include "safetitle.h"
 #include "util.h"
 
 #ifdef DEBUG
@@ -698,6 +699,7 @@ nochange:
 			/* Save history */
 			strlcpy(oldpath, path, sizeof(oldpath));
 			strlcpy(path, dir, sizeof(path));
+			safetitle(path);
 			/* Reset filter */
 			strlcpy(fltr, ifilter, sizeof(fltr));
 			goto begin;
@@ -731,6 +733,7 @@ nochange:
 					goto nochange;
 				}
 				strlcpy(path, newpath, sizeof(path));
+				safetitle(path);
 				/* Reset filter */
 				strlcpy(fltr, ifilter, sizeof(fltr));
 				goto begin;
@@ -801,6 +804,7 @@ nochange:
 				goto nochange;
 			}
 			strlcpy(path, newpath, sizeof(path));
+			safetitle(path);
 			/* Reset filter */
 			strlcpy(fltr, ifilter, sizeof(fltr));
 			DPRINTF_S(path);
@@ -816,6 +820,7 @@ nochange:
 				goto nochange;
 			}
 			strlcpy(path, tmp, sizeof(path));
+			safetitle(path);
 			/* Reset filter */
 			strlcpy(fltr, ifilter, sizeof(fltr));
 			DPRINTF_S(path);
diff --git a/safetitle.c b/safetitle.c
new file mode 100644
index 0000000..b9d8be0
--- /dev/null
+++ b/safetitle.c
@@ -0,0 +1,104 @@
+/*
+ *  safetitle sets the title of the terminal window to the given string,
+ *  unless the terminal type is blacklisted.
+ */
+
+#include <err.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/select.h>
+#include <termios.h>
+#include <unistd.h>
+
+#define WSCONS_DA (char[]){27,91,62,50,52,59,50,48,59,48,99,0}
+#define SCREEN_DA (char[]){27,91,62,56,51,59,52,48,56,48,48,59,48,99,0}
+
+int screen = 0;
+
+int
+blacklisted(int fd)
+{
+	char *buf, c;
+	fd_set fds;
+	int i, r;
+	struct timeval timeout;
+
+	if((buf = malloc(200*sizeof(char)))==NULL)
+		err(1, "malloc");
+
+	/* check if GNU screen */
+	write(fd, "\033[>c", 4);
+	i = 0;
+	while(r = read(fd, &c, 1)){
+		if(r==-1)
+			return 1;
+		buf[i++] = c;
+		if(c=='c') break;
+	}
+	buf[i] = '\0';
+	screen = strcmp(buf, SCREEN_DA)==0;
+
+	/* ignore strange trailing nul before reading response */
+	FD_ZERO(&fds);
+	FD_SET(fd, &fds);
+	timeout.tv_sec = 0;
+	timeout.tv_usec = 0;
+	while(select(fd+1, &fds, NULL, NULL, &timeout)>0)
+		read(fd, &c, 1);
+
+	/* check (real) terminal type(s) */
+	if(screen) write(fd, "\033P\033[>c\033\\", 8);
+	else write(fd, "\033[>c", 4);
+
+	i = 0;
+	while(r = read(fd, &c, 1)){
+loop:
+		if(r==-1)
+			return 1;
+		buf[i++] = c;
+		if(c==99) break;
+	}
+	buf[i] = '\0';
+
+	if(strcmp(buf, WSCONS_DA)==0)
+		return 1;
+
+	/* go back and check remaining responses (if any) */
+check:
+	FD_ZERO(&fds);
+	FD_SET(fd, &fds);
+	timeout.tv_sec = 0;
+	timeout.tv_usec = 1; /* it takes a millisecond sometimes */
+	if(screen && select(fd+1, &fds, NULL, NULL, &timeout)>0){
+		/* ignore strange trailing nul before reading response */
+		if(read(fd, &c, 1)==-1)
+			return 1;
+		i = 0;
+		if(c==0) goto check;
+		else goto loop;
+	}
+
+	return 0;
+}
+
+void
+safetitle(char *title)
+{
+	int ttyfd;
+
+        if((ttyfd = open("/dev/tty", O_RDWR))==-1)
+                err(1, "open");
+
+	/* get device attributes for real terminal */
+	if(blacklisted(ttyfd))
+		return;
+
+	if(strncmp(title, "/home/", 6)==0)
+		title += 6;
+
+	/* set title */
+	if(screen) dprintf(ttyfd, "\033P\033]2;%s\007\033\\", title);
+	else dprintf(ttyfd, "\033]2;%s\007", title);
+}
diff --git a/safetitle.h b/safetitle.h
new file mode 100644
index 0000000..9d72423
--- /dev/null
+++ b/safetitle.h
@@ -0,0 +1 @@
+void safetitle(char *);
diff --git a/safetitle.o b/safetitle.o
new file mode 100644
index 0000000..a3e7abf
Binary files /dev/null and b/safetitle.o differ
-- 
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