---
 src/pstree.c |   38 +++++++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)

--- src/pstree.c
+++ src/pstree.c	2022-12-13 07:46:58.243076344 +0000
@@ -79,6 +79,7 @@ extern const char *__progname;
 #define UTF_HD        "\342\224\254"        /* U+252C, Horizontal and down */
 
 #define VT_BEG        "\033(0\017"        /* use graphic chars */
+#define VT_LEN      4
 #define VT_END        "\033(B"        /* back to normal char set */
 #define VT_V        "x"                /* see UTF definitions above */
 #define VT_VR        "t"
@@ -578,6 +579,28 @@ static void out_scontext(const PROC *cur
     out_string("'");
 }
 
+/*
+ * Only affects vt100 line drawing mode: Do not count the strlen of
+ * VT_BEG to prevent doing end-of-line way too early:
+ */
+static void
+out_sym (const char *str)
+{
+    int seq = 0;
+    if (sym == &sym_vt100 && *str == '\033') {
+        seq = 1;
+        if (cur_x <= output_width || !trunc)
+            cur_x -= VT_LEN;
+    }
+    out_string(str);
+    if (seq) {
+        str = VT_END;
+        while (*str)
+            putchar (*str++);
+    }
+}
+
+
 static void out_newline(void)
 {
     if (last_char && cur_x == output_width)
@@ -817,11 +840,12 @@ dump_tree(PROC * current, int level, int
         for (lvl = 0; lvl < level; lvl++) {
             for (i = width[lvl] + 1; i; i--)
                 out_char(' ');
-            out_string(lvl ==
-                       level -
-                       1 ? last ? sym->last_2 : sym->branch_2 : more[lvl +
-                                                                     1] ?
-                       sym->vert_2 : sym->empty_2);
+            /*
+             * Replace all three symbol-drawing calls with calls to out_sym()
+             * to handle VT100 line drawing sequences if VT100 mode is active:
+             */
+            out_sym(lvl == level - 1 ? last ? sym->last_2 : sym->branch_2 :
+            more[lvl + 1] ? sym->vert_2 : sym->empty_2);
         }
 
     if (rep < 2)
@@ -931,7 +955,7 @@ dump_tree(PROC * current, int level, int
     }
     width[level] = comm_len + cur_x - offset + add;
     if (cur_x >= output_width && trunc) {
-        out_string(sym->first_3);
+        out_sym(sym->first_3);
         out_string("+");
         out_newline();
         return;
@@ -955,7 +979,7 @@ dump_tree(PROC * current, int level, int
                 }
         }
         if (first) {
-            out_string(next ? sym->first_3 : sym->single_3);
+            out_sym(next ? sym->first_3 : sym->single_3);
             first = 0;
         }
         dump_tree(walk->child, level + 1, count + 1,