gui: Remove ->cols and ->lines of struct gui_window.

The curses library provides the getmaxyx() macro to obtain the window
geometry. It's better to use these instead of storing the number of
lines and columns in the gui_window structure because with getmaxyx()
there is no risk to have stale values gui_window structure.

While the ncurses implementation provides getmaxx() and getmaxy()
to get only the number of lines or columns, respectively, only
getmaxyx() is described in the XSI Curses standard. Hence we provide
our own version of the former two functions. These call getmaxyx()
and return one of the two numbers.

With the ->cols and ->lines fields of struct gui_window gone, all
callers had to be adjusted to use either getmaxyx() or one of the
new functions.

diff --git a/gui.c b/gui.c
index 57cfe638dd5ba247763472b7bca4a2e5fd80748e..9cf950650090cc263b8395c09088f7ad0e3178fd 100644 (file)
--- a/gui.c
+++ b/gui.c
@@ -34,8 +34,6 @@ static int signal_pipe;
 
 static struct gui_window {
        WINDOW *win;
-       size_t cols;
-       size_t lines;
 } top, bot, sb, in, sep;
 
 #define RINGBUFFER_SIZE 512
@@ -45,7 +43,6 @@ struct rb_entry {
        int color;
 };
 static struct ringbuffer *bot_win_rb;
-#define NUM_LINES(len) (1 + (len) / bot.cols)
 
 static unsigned scroll_position;
 
@@ -203,6 +200,31 @@ static int find_cmd_byname(char *name)
        return -1;
 }
 
+/*
+ * Even though ncurses provides getmaxx and getmaxy, these functions/macros are
+ * not described in the XSI Curses standard.
+ */
+static int get_num_lines(struct gui_window *w)
+{
+       int lines;
+       __a_unused int cols; /* avoid "set but not used" warnings */
+
+       getmaxyx(w->win, lines, cols);
+       return lines;
+}
+
+static int get_num_cols(struct gui_window *w)
+{
+       __a_unused int lines; /* avoid "set but not used" warnings */
+       int cols;
+
+       getmaxyx(w->win, lines, cols);
+       return cols;
+}
+
+/** Number of lines of the window are occupied by an output line. */
+#define NUM_LINES(len) (1 + (len) / get_num_cols(&bot))
+
 /* isendwin() returns false before initscr() was called */
 static bool curses_active(void)
 {
@@ -354,7 +376,7 @@ __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
        xvasprintf(&msg, fmt, ap);
        va_end(ap);
        wmove(in.win, 0, 0);
-       align_str(in.win, msg, in.cols, LEFT);
+       align_str(in.win, msg, get_num_cols(&in), LEFT);
        free(msg);
        wrefresh(in.win);
 }
@@ -365,7 +387,7 @@ static void print_status_bar(void)
 
        tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
        wmove(sb.win, 0, 0);
-       align_str(sb.win, tmp, sb.cols, CENTER);
+       align_str(sb.win, tmp, get_num_cols(&sb), CENTER);
        free(tmp);
 }
 
@@ -376,7 +398,8 @@ static void print_status_bar(void)
  */
 static int first_visible_rbe(unsigned *lines)
 {
-       int i;
+       int i, bot_lines = get_num_lines(&bot);
+
        *lines = 0;
        for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
                struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
@@ -384,10 +407,10 @@ static int first_visible_rbe(unsigned *lines)
                if (!rbe)
                        return i - 1;
                rbe_lines = NUM_LINES(rbe->len);
-               if (rbe_lines > bot.lines)
+               if (rbe_lines > bot_lines)
                        return -1;
                *lines += rbe_lines;
-               if (*lines >= bot.lines)
+               if (*lines >= bot_lines)
                        return i;
        }
        return RINGBUFFER_SIZE - 1;
@@ -398,7 +421,7 @@ returns number of first visible rbe, *lines is the number of lines drawn.
  */
 static int draw_top_rbe(unsigned *lines)
 {
-       int ret, fvr = first_visible_rbe(lines);
+       int bot_cols, bot_lines, ret, fvr = first_visible_rbe(lines);
        struct rb_entry *rbe;
        size_t bytes_to_skip, cells_to_skip, width;
 
@@ -408,9 +431,10 @@ static int draw_top_rbe(unsigned *lines)
        rbe = ringbuffer_get(bot_win_rb, fvr);
        if (!rbe)
                return -1;
-       if (*lines > bot.lines) {
+       getmaxyx(bot.win, bot_lines, bot_cols);
+       if (*lines > bot_lines) {
                /* rbe is partially visible multi-line */
-               cells_to_skip = (*lines - bot.lines) * bot.cols;
+               cells_to_skip = (*lines - bot_lines) * bot_cols;
                ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
                if (ret < 0)
                        return ret;
@@ -430,14 +454,14 @@ static int draw_top_rbe(unsigned *lines)
 static void redraw_bot_win(void)
 {
        unsigned lines;
-       int i;
+       int i, bot_lines = get_num_lines(&bot);
 
        wmove(bot.win, 0, 0);
        wclear(bot.win);
        i = draw_top_rbe(&lines);
        if (i <= 0)
                goto out;
-       while (i > 0 && lines < bot.lines) {
+       while (i > 0 && lines < bot_lines) {
                struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
                if (!rbe) {
                        lines++;
@@ -572,11 +596,12 @@ static void print_stat_item(int i)
        char *tmp;
        struct stat_item_data d = theme.data[i];
        char *c = stat_content[i];
+       int top_lines = get_num_lines(&top);
 
        if (!curses_active() || !d.len || !c)
                return;
        tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
-       wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
+       wmove(top.win, d.y * top_lines / 100, d.x * COLS / 100);
        wrefresh(top.win);
        wattron(top.win, COLOR_PAIR(i + 1));
        align_str(top.win, tmp, d.len * COLS / 100, d.align);
@@ -675,35 +700,31 @@ static void init_wins(int top_lines)
 {
        int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
                in_y = LINES - 1, sep_y = top_lines;
-
-       top.lines = top_lines;
-       bot.lines = LINES - top.lines - 3;
-       sb.lines = in.lines = sep.lines = 1;
-
-       top.cols = bot.cols = sb.cols = in.cols = sep.cols = COLS;
+       int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
+               sep_lines = 1;
 
        assume_default_colors(theme.default_fg, theme.default_bg);
        if (top.win) {
-               wresize(top.win, top.lines, top.cols);
+               wresize(top.win, top_lines, COLS);
                mvwin(top.win, top_y, 0);
 
-               wresize(sb.win, sb.lines, sb.cols);
+               wresize(sb.win, sb_lines, COLS);
                mvwin(sb.win, sb_y, 0);
 
-               wresize(sep.win, sep.lines, sep.cols);
+               wresize(sep.win, sep_lines, COLS);
                mvwin(sep.win, sep_y, 0);
 
-               wresize(bot.win, bot.lines, bot.cols);
+               wresize(bot.win, bot_lines, COLS);
                mvwin(bot.win, bot_y, 0);
 
-               wresize(in.win, in.lines, in.cols);
+               wresize(in.win, in_lines, COLS);
                mvwin(in.win, in_y, 0);
        } else {
-               sep.win = newwin(sep.lines, sep.cols, sep_y, 0);
-               top.win = newwin(top.lines, top.cols, top_y, 0);
-               bot.win = newwin(bot.lines, bot.cols, bot_y, 0);
-               sb.win = newwin(sb.lines, sb.cols, sb_y, 0);
-               in.win = newwin(in.lines, in.cols, in_y, 0);
+               sep.win = newwin(sep_lines, COLS, sep_y, 0);
+               top.win = newwin(top_lines, COLS, top_y, 0);
+               bot.win = newwin(bot_lines, COLS, bot_y, 0);
+               sb.win = newwin(sb_lines, COLS, sb_y, 0);
+               in.win = newwin(in_lines, COLS, in_y, 0);
                if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
                        die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
                wclear(bot.win);
@@ -1100,13 +1121,13 @@ static void print_scroll_msg(void)
 
 static void com_scroll_top(void)
 {
-       int i = RINGBUFFER_SIZE - 1;
+       int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
        unsigned lines = 0;
 
        while (i > 0 && !ringbuffer_get(bot_win_rb, i))
                i--;
        /* i is oldest entry */
-       for (; lines < bot.lines && i >= 0; i--) {
+       for (; lines < bot_lines && i >= 0; i--) {
                struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
                if (!rbe)
                        break;
@@ -1136,9 +1157,9 @@ static void com_cancel_scrolling(void)
 static void com_page_down(void)
 {
        unsigned lines = 0;
-       int i = scroll_position;
+       int i = scroll_position, bot_lines = get_num_lines(&bot);
 
-       while (lines < bot.lines && --i > 0) {
+       while (lines < bot_lines && --i > 0) {
                struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
                if (!rbe)
                        break;
@@ -1156,7 +1177,7 @@ static void com_page_down(void)
 static void com_page_up(void)
 {
        unsigned lines;
-       int fvr = first_visible_rbe(&lines);
+       int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
 
        if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
                print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
@@ -1165,7 +1186,7 @@ static void com_page_up(void)
        scroll_position = fvr + 1;
        for (; scroll_position > 0; scroll_position--) {
                first_visible_rbe(&lines);
-               if (lines == bot.lines)
+               if (lines == bot_lines)
                        break;
        }
        redraw_bot_win();
@@ -1175,7 +1196,7 @@ static void com_page_up(void)
 static void com_scroll_down(void)
 {
        struct rb_entry *rbe;
-       int rbe_lines;
+       int rbe_lines, bot_lines = get_num_lines(&bot);
 
        if (!scroll_position) {
                print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
@@ -1185,7 +1206,7 @@ static void com_scroll_down(void)
        rbe = ringbuffer_get(bot_win_rb, scroll_position);
        rbe_lines = NUM_LINES(rbe->len);
        wscrl(bot.win, rbe_lines);
-       wmove(bot.win, bot.lines - rbe_lines, 0);
+       wmove(bot.win, bot_lines - rbe_lines, 0);
        wattron(bot.win, COLOR_PAIR(rbe->color));
        waddstr(bot.win, rbe->msg);
        wrefresh(bot.win);
@@ -1323,21 +1344,25 @@ static void com_help(void)
 
 static void com_shrink_top_win(void)
 {
-       if (top.lines <= theme.top_lines_min) {
+       int top_lines = get_num_lines(&top);
+
+       if (top_lines <= theme.top_lines_min) {
                PARA_WARNING_LOG("can not decrease top window\n");
                return;
        }
-       init_wins(top.lines - 1);
+       init_wins(top_lines - 1);
        print_in_bar(COLOR_MSG, "%s", "decreased top window");
 }
 
 static void com_enlarge_top_win(void)
 {
-       if (bot.lines < 3) {
+       int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
+
+       if (bot_lines < 3) {
                PARA_WARNING_LOG("can not increase top window\n");
                return;
        }
-       init_wins(top.lines + 1);
+       init_wins(top_lines + 1);
        print_in_bar(COLOR_MSG, "increased top window");
 }