[gdb/build] Remove dependency on _rl_term_autowrap

[thirdparty/binutils-gdb.git] / gdb / utils.c

diff --git a/gdb/utils.c b/gdb/utils.c
index 5ec8c5671f3a0feb6a606a1dd055ae1342e3ca00..9ae9494d51d2d602f31609dcaaa1557eaac6b9db 100644 (file)
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -1110,10 +1110,6 @@ static bool filter_initialized = false;
 
 \f
 
-/* See readline's rlprivate.h.  */
-
-extern "C" int _rl_term_autowrap;
-
 /* See utils.h.  */
 
 int readline_hidden_cols = 0;
@@ -1154,10 +1150,17 @@ init_page_info (void)
           (because rl_change_environment defaults to 1)
         - may report one less than the detected screen width in
           rl_get_screen_size (when _rl_term_autowrap == 0).
-        We could set readline_hidden_cols by comparing COLUMNS to cols as
-        returned by rl_get_screen_size, but instead simply use
-        _rl_term_autowrap.  */
-      readline_hidden_cols = _rl_term_autowrap ? 0 : 1;
+        We could use _rl_term_autowrap, but we want to avoid introducing
+        another dependency on readline private variables, so set
+        readline_hidden_cols by comparing COLUMNS to cols as returned by
+        rl_get_screen_size.  */
+      const char *columns_env_str = getenv ("COLUMNS");
+      gdb_assert (columns_env_str != nullptr);
+      int columns_env_val = atoi (columns_env_str);
+      gdb_assert (columns_env_val != 0);
+      readline_hidden_cols = columns_env_val - cols;
+      gdb_assert (readline_hidden_cols >= 0);
+      gdb_assert (readline_hidden_cols <= 1);
 
       lines_per_page = rows;
       chars_per_line = cols + readline_hidden_cols;