git: 95e6fd1fd85a - main - stand: split fg/bg handling up a little further

The branch main has been updated by kevans:

URL: https://cgit.FreeBSD.org/src/commit/?id=95e6fd1fd85a448d2c68473b85a61fba24c9bc4f

commit 95e6fd1fd85a448d2c68473b85a61fba24c9bc4f
Author:     Kyle Evans <kevans@FreeBSD.org>
AuthorDate: 2025-08-22 03:48:14 +0000
Commit:     Kyle Evans <kevans@FreeBSD.org>
CommitDate: 2025-08-22 03:48:28 +0000

    stand: split fg/bg handling up a little further
    
    These can be setup independently, so we should also check them and
    initialize each independently.  This fixes a pre-existing bug where-in
    we may not pickup a bg color specified in the environment if a fg color
    wasn't set.
    
    The new version also ensures that we're hooking the color vars properly
    if we're using a value that was already there, as the console may need
    to adjust if something wants to switch them up again.  Otherwise, a
    teken.fg_color set in loader could conceivably occur that only changes
    the color when you get to the kernel, which could be surprising.
    
    Reviewed by:    imp
    Differential Revision:  https://reviews.freebsd.org/D50887
---
 stand/common/gfx_fb.c | 59 ++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 42 insertions(+), 17 deletions(-)

diff --git a/stand/common/gfx_fb.c b/stand/common/gfx_fb.c
index 1d2f22649955..e9a343f2985a 100644
--- a/stand/common/gfx_fb.c
+++ b/stand/common/gfx_fb.c
@@ -232,35 +232,60 @@ gfx_parse_mode_str(char *str, int *x, int *y, int *depth)
 	return (true);
 }
 
+/*
+ * Returns true if we set the color from pre-existing environment, false if
+ * just used existing defaults.
+ */
+static bool
+gfx_fb_evalcolor(const char *envname, teken_color_t *cattr,
+    ev_sethook_t sethook, ev_unsethook_t unsethook)
+{
+	const char *ptr;
+	char env[10];
+	bool from_env = false;
+
+	ptr = getenv(envname);
+	if (ptr != NULL) {
+		*cattr = strtol(ptr, NULL, 10);
+
+		/*
+		 * If we can't unset the value, then it's probably hooked
+		 * properly and we can just carry on.  Otherwise, we want to
+		 * reinitialize it so that we can hook it for the console that
+		 * we're resetting defaults for.
+		 */
+		if (unsetenv(envname) != 0)
+			return (true);
+		from_env = true;
+	}
+
+	snprintf(env, sizeof(env), "%d", *cattr);
+	env_setenv(envname, EV_VOLATILE, env, sethook, unsethook);
+
+	return (from_env);
+}
+
 void
 gfx_fb_setcolors(teken_attr_t *attr, ev_sethook_t sethook,
      ev_unsethook_t unsethook)
 {
 	const char *ptr;
-	char env[10];
+	bool need_setattr = false;
 
 	/*
 	 * On first run, we setup an environment hook to process any color
 	 * changes.  If the env is already set, we pick up fg and bg color
 	 * values from the environment.
 	 */
-	ptr = getenv("teken.fg_color");
-	if (ptr != NULL) {
-		attr->ta_fgcolor = strtol(ptr, NULL, 10);
-		ptr = getenv("teken.bg_color");
-		attr->ta_bgcolor = strtol(ptr, NULL, 10);
-
+	if (gfx_fb_evalcolor("teken.fg_color", &attr->ta_fgcolor,
+	    sethook, unsethook))
+		need_setattr = true;
+	if (gfx_fb_evalcolor("teken.bg_color", &attr->ta_bgcolor,
+	    sethook, unsethook))
+		need_setattr = true;
+
+	if (need_setattr)
 		teken_set_defattr(&gfx_state.tg_teken, attr);
-	} else {
-		snprintf(env, sizeof(env), "%d",
-		    attr->ta_fgcolor);
-		env_setenv("teken.fg_color", EV_VOLATILE, env,
-		    sethook, unsethook);
-		snprintf(env, sizeof(env), "%d",
-		    attr->ta_bgcolor);
-		env_setenv("teken.bg_color", EV_VOLATILE, env,
-		    sethook, unsethook);
-	}
 }
 
 static uint32_t