[src/trunk]: src/games/testpat - Don't allocate memory dynamically on the sta...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/249845295fa7
branches:  trunk
changeset: 958502:249845295fa7
user:      christos <christos%NetBSD.org@localhost>
date:      Fri Jan 08 15:16:04 2021 +0000

description:
- Don't allocate memory dynamically on the stack (for SSP)
- Don't return errno as exit code
- Fold long lines

diffstat:

 games/testpat/testpat.c |  101 +++++++++++++++++++++++++++--------------------
 1 files changed, 57 insertions(+), 44 deletions(-)

diffs (171 lines):

diff -r 98dea47c21bd -r 249845295fa7 games/testpat/testpat.c
--- a/games/testpat/testpat.c   Fri Jan 08 09:41:24 2021 +0000
+++ b/games/testpat/testpat.c   Fri Jan 08 15:16:04 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: testpat.c,v 1.3 2021/01/02 12:12:26 jmcneill Exp $ */
+/* $NetBSD: testpat.c,v 1.4 2021/01/08 15:16:04 christos Exp $ */
 
 /*-
  * Copyright (c) 2016 Nathanial Sloss <nathanialsloss%yahoo.com.au@localhost>
@@ -25,6 +25,11 @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: testpat.c,v 1.4 2021/01/08 15:16:04 christos Exp $");
+
+#include <sys/types.h>
+#include <sys/time.h>
 
 #include <curses.h>
 #include <err.h>
@@ -34,69 +39,66 @@
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
-#include <sys/time.h>
-#include <sys/types.h>
+
+static int colour_list[6] = {
+       COLOR_YELLOW,
+       COLOR_CYAN,
+       COLOR_GREEN,
+       COLOR_MAGENTA,
+       COLOR_RED,
+       COLOR_BLUE,
+};
+static int numcolours = (int)__arraycount(colour_list);
 
 int main(int argc, char *argv[]) {
        int i, col, colour, line, x_limit, y_limit, colourOK, spacing;
        int xpos, ypos, spacing_residual, spacing_start, spacing_end;
-       int grid_x, grid_y;
+       int grid_x, grid_y, **circle_pos;
+       size_t ncpos;
        float grid_unit;
-
-       char title[255] = "NetBSD";
-       int numcolours = 6;
-
-       int colour_list[6] = {
-               COLOR_YELLOW,
-               COLOR_CYAN,
-               COLOR_GREEN,
-               COLOR_MAGENTA,
-               COLOR_RED,
-               COLOR_BLUE,
-       };
-
+       const char *title = "NetBSD";
        float coord_x, circle_int;
        float a_axis, b_axis;
 
-       if (!(initscr())) {
-               printf("\nUnknown terminal type.");
-               printf("\n");
-               return EXIT_FAILURE;
+       if (!initscr()) {
+               errx(EXIT_FAILURE, "Unknown terminal type");
        }
+
        curs_set(0);
 
        if (argc > 2) {
                endwin();
-               errx(EINVAL, "usage: testpat [title]");
+               fprintf(stderr, "Usage: %s <title>", getprogname());
+               return EXIT_FAILURE;
        }
 
-       if (argc == 2 && strlen(argv[1]) < (size_t)COLS)
-               snprintf(title, sizeof(title), "%s", argv[1]);
-       else if (argc == 2 && (int)strlen(argv[1]) > COLS) {
-               endwin();
-               errx(EINVAL, "title string must be less than display columns");
+       if (argc == 2) {
+               title = argv[1];
+               if (strlen(title) >= (size_t)COLS) {
+                       endwin();
+                       errx(EXIT_FAILURE,
+                           "Title string is longer than display cols");
+               }
        }
 
        colourOK = has_colors();
 
        if (COLS < 13 || LINES < 13) {
                endwin();
-               printf("\nTerminal size must be at least 72x25.");
-               printf("\n");
-               return EXIT_FAILURE;
+               errx(EXIT_FAILURE, "Terminal size must be at least 72x25.");
        }
 
        if (colourOK) {
                start_color();
 
-               init_pair( 0, COLOR_WHITE, COLOR_BLACK );
-               init_pair( 1, COLOR_WHITE, COLOR_RED );
-               init_pair( 2, COLOR_WHITE, COLOR_GREEN );
-               init_pair( 3, COLOR_WHITE, COLOR_YELLOW );
-               init_pair( 4, COLOR_WHITE, COLOR_BLUE );
-               init_pair( 5, COLOR_WHITE, COLOR_MAGENTA );
-               init_pair( 6, COLOR_WHITE, COLOR_CYAN );
-               init_pair( 7, COLOR_BLACK, COLOR_WHITE );
+               init_pair(0, COLOR_WHITE, COLOR_BLACK);
+               init_pair(1, COLOR_WHITE, COLOR_RED);
+               init_pair(2, COLOR_WHITE, COLOR_GREEN);
+               init_pair(3, COLOR_WHITE, COLOR_YELLOW);
+               init_pair(4, COLOR_WHITE, COLOR_BLUE);
+               init_pair(5, COLOR_WHITE, COLOR_MAGENTA);
+               init_pair(6, COLOR_WHITE, COLOR_CYAN);
+               init_pair(7, COLOR_BLACK, COLOR_WHITE);
 
                attrset(COLOR_PAIR(0));
        }
@@ -113,11 +115,21 @@
        grid_y = grid_unit;
        grid_x = grid_unit * 2;
 
-       int circle_pos[y_limit][2];
-       memset(circle_pos, -1, sizeof(circle_pos));
+       
+       ncpos = y_limit * sizeof(*circle_pos)
+           + y_limit * 2 * sizeof(**circle_pos);
+       circle_pos = malloc(ncpos);
+       if (circle_pos == NULL) {
+               endwin();
+               errx(EXIT_FAILURE, "Can't allocate circle positions");
+       }
+       for (i = 0; i < y_limit; i++) {
+           circle_pos[i] = (void *)&circle_pos[y_limit + i * 2];
+           circle_pos[i][0] = circle_pos[i][1] = -1;
+       }
 
        for (i = 0; i < y_limit; i++) {
-               /* Draw an elipse (looks more circular.) */
+               /* Draw an ellipse (looks more circular.) */
                circle_int = (i - a_axis) / a_axis;
                circle_int = 1 - powf(circle_int, 2);
                circle_int = circle_int * powf(b_axis, 2);
@@ -200,8 +212,8 @@
                        attrset(COLOR_PAIR(COLOR_BLACK));
 
                for (col = roundf((4 * grid_unit * 2) +
-                   circle_pos[y_limit /2][0]); col <= roundf((9 * grid_unit
-                   * 2) + circle_pos[y_limit /2][0]); col++)
+                   circle_pos[y_limit / 2][0]); col <= roundf((9 * grid_unit
+                   * 2) + circle_pos[y_limit / 2][0]); col++)
                        mvaddch(i, col, ' ');
        }
 
@@ -435,7 +447,8 @@
        for (col = 1; col < x_limit; col = col + grid_x) {
                xpos = col;
                while (xpos < col + grid_x - 1) {
-                       if (xpos >= circle_pos[line][0] && xpos < circle_pos[line][1])
+                       if (xpos >= circle_pos[line][0]
+                           && xpos < circle_pos[line][1])
                                mvaddch(line, xpos, 113 | A_ALTCHARSET);
                        xpos++;
                }