[src/trunk]: src/sys/ddb db_putchar - check if we need to wrap at $maxwidth a...

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

details:   https://anonhg.NetBSD.org/src/rev/c3175ac89339
branches:  trunk
changeset: 454262:c3175ac89339
user:      uwe <uwe%NetBSD.org@localhost>
date:      Thu Sep 12 18:43:02 2019 +0000

description:
db_putchar - check if we need to wrap at $maxwidth after whitespace.
That fixes orphaned first character in something like:

    |Stopped in ... longsymbol+0xf00:  |
    |i
    |nsn

diffstat:

 sys/ddb/db_output.c |  32 ++++++++++++++++++++++----------
 1 files changed, 22 insertions(+), 10 deletions(-)

diffs (62 lines):

diff -r 836b30454b30 -r c3175ac89339 sys/ddb/db_output.c
--- a/sys/ddb/db_output.c       Thu Sep 12 18:28:05 2019 +0000
+++ b/sys/ddb/db_output.c       Thu Sep 12 18:43:02 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: db_output.c,v 1.34 2018/09/16 23:18:55 mrg Exp $       */
+/*     $NetBSD: db_output.c,v 1.35 2019/09/12 18:43:02 uwe Exp $       */
 
 /*
  * Mach Operating System
@@ -35,7 +35,7 @@
 #endif
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: db_output.c,v 1.34 2018/09/16 23:18:55 mrg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: db_output.c,v 1.35 2019/09/12 18:43:02 uwe Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -103,6 +103,24 @@
        db_last_non_space = db_output_position;
 }
 
+
+/*
+ * End the current line if we it exceeds $maxwidth
+ */
+static void
+db_check_wrap(void)
+{
+
+       if (db_max_width >= DB_MIN_MAX_WIDTH
+           && db_output_position >= db_max_width) {
+               cnputc('\n');
+               db_output_position = 0;
+               db_last_non_space = 0;
+               db_output_line++;
+       }
+}
+
+
 static void
 db_more(void)
 {
@@ -148,16 +166,10 @@
                 * Use tabs if possible.
                 */
                db_force_whitespace();
+               db_check_wrap();
                cnputc(c);
                db_output_position++;
-               if (db_max_width >= DB_MIN_MAX_WIDTH
-                   && db_output_position >= db_max_width) {
-                       /* auto new line */
-                       cnputc('\n');
-                       db_output_position = 0;
-                       db_last_non_space = 0;
-                       db_output_line++;
-               }
+               db_check_wrap();
                db_last_non_space = db_output_position;
        } else if (c == '\n') {
                /* Return */