files: block the resizing signal while reading from an external command

A SIGWINCH somehow causes the input stream to see EOT, with the result
that any remaining output of an external program would be lost.

This fixes https://savannah.gnu.org/bugs/?56038,
and fixes https://savannah.gnu.org/bugs/?56033.

Signed-off-by: Brand Huntsman <alpha@qzx.com>

src/files.c

@@ -800,6 +800,10 @@ void read_file(FILE *f, int fd, const char *filename, bool undoable)
 	topline = make_new_node(NULL);
 	bottomline = topline;
 
+#ifndef NANO_TINY
+	block_sigwinch(TRUE);
+#endif
+
 	/* Lock the file before starting to read it, to avoid the overhead
 	 * of locking it for each single byte that we read from it. */
 	flockfile(f);
@@ -875,6 +879,10 @@ void read_file(FILE *f, int fd, const char *filename, bool undoable)
 	/* We are done with the file, unlock it. */
 	funlockfile(f);
 
+#ifndef NANO_TINY
+	block_sigwinch(FALSE);
+#endif
+
 	/* Perhaps this could use some better handling. */
 	if (ferror(f))
 		nperror(filename);

src/nano.c

@@ -1290,7 +1290,7 @@ RETSIGTYPE do_continue(int signal)
 	ungetch(KEY_FLUSH);
 }
 
-#ifdef ENABLE_SPELLER
+#if !defined(NANO_TINY) || defined(ENABLE_SPELLER)
 /* Block or unblock the SIGWINCH signal, depending on the blockit parameter. */
 void block_sigwinch(bool blockit)
 {
@@ -1299,6 +1299,11 @@ void block_sigwinch(bool blockit)
 	sigemptyset(&winch);
 	sigaddset(&winch, SIGWINCH);
 	sigprocmask(blockit ? SIG_BLOCK : SIG_UNBLOCK, &winch, NULL);
+
+#ifndef NANO_TINY
+	if (the_window_resized)
+		regenerate_screen();
+#endif
 }
 #endif
 

src/proto.h

@@ -424,7 +424,7 @@ RETSIGTYPE handle_crash(int signal);
 #endif
 RETSIGTYPE do_suspend(int signal);
 RETSIGTYPE do_continue(int signal);
-#ifdef ENABLE_SPELLER
+#if !defined(NANO_TINY) || defined(ENABLE_SPELLER)
 void block_sigwinch(bool blockit);
 #endif
 #ifndef NANO_TINY