gui: Check return values of curses functions more strictly.

noecho(), cbreak() and init_pair() may fail. Detect these errors and exit
with a proper error message.

diff --git a/gui.c b/gui.c
index c21ee0289f6b9abdc0694bd3ba0eed7f7eb600c9..eba1e2a59331564a40677a123d1220dc9120c059 100644 (file)
--- a/gui.c
+++ b/gui.c
@@ -759,28 +759,36 @@ static void clear_all_items(void)
        }
 }
 
-static void init_colors(void)
+static void init_pair_or_die(short pair, short f, short b)
+{
+       if (init_pair(pair, f, b) == ERR)
+               msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
+}
+
+static void init_colors_or_die(void)
 {
        int i;
 
        if (!has_colors())
-               msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
-       start_color();
+               msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
+       if (start_color() == ERR)
+               msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
        FOR_EACH_STATUS_ITEM(i)
                if (theme.data[i].len)
-                       init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
-       init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
-       init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
-       init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
-       init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
-       init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
-       init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
-       init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
-       init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
-       init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
+                       init_pair_or_die(i + 1, theme.data[i].fg,
+                               theme.data[i].bg);
+       init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
+       init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
+       init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
+       init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
+       init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
+       init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
+       init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
+       init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
+       init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 }
 
-/* (Re-)initialize the curses library. FIXME: Error checking. */
+/* (Re-)initialize the curses library. */
 static void init_curses(void)
 {
        curses_active = 1;
@@ -791,14 +799,18 @@ static void init_curses(void)
                        " (need at least %dx%d)\n", COLS, LINES,
                        theme.cols_min, theme.lines_min);
        curs_set(0); /* make cursor invisible, ignore errors */
-       nonl(); /* tell curses not to do NL->CR/NL on output */
-       noecho(); /* don't echo input */
-       cbreak(); /* take input chars one at a time, no wait for \n */
-       init_colors();
-       clear();
+       nonl(); /* do not NL->CR/NL on output, always returns OK */
+       /* don't echo input */
+       if (noecho() == ERR)
+               msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
+       /* take input chars one at a time, no wait for \n */
+       if (cbreak() == ERR)
+               msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
+       init_colors_or_die();
+       clear(); /* ignore non-fatal errors */
        init_wins(theme.top_lines_default);
        print_all_items();
-       noecho(); /* don't echo input */
+       // noecho(); /* don't echo input */
 }
 
 static void check_sigchld(void)