vendor/bc: import version 5.2.4

This update fixes an issue in input line editing: when going left to
the start of the line, the cursor would jump to the end of the line
instead.

NEWS.md

@@ -1,5 +1,15 @@
 # News
 
+## 5.2.4
+
+This is a production release that fixes two bugs in history:
+
+* Without prompt, the cursor could not be placed on the first character in a
+  line.
+* Home and End key handling in `tmux` was fixed.
+
+Any users that do not care about these improvements do not need to upgrade.
+
 ## 5.2.3
 
 This is a production release that fixes one bug, a parse error when passing a

include/version.h

@@ -37,6 +37,6 @@
 #define BC_VERSION_H
 
 /// The current version.
-#define VERSION 5.2.3
+#define VERSION 5.2.4
 
 #endif // BC_VERSION_H

src/data.c

@@ -68,7 +68,7 @@ const uchar dc_sig_msg_len = (uchar) (sizeof(dc_sig_msg) - 1);
 
 /// The copyright banner.
 const char bc_copyright[] =
-	"Copyright (c) 2018-2021 Gavin D. Howard and contributors\n"
+	"Copyright (c) 2018-2022 Gavin D. Howard and contributors\n"
 	"Report bugs at: https://git.yzena.com/gavin/bc\n\n"
 	"This is free software with ABSOLUTELY NO WARRANTY.\n";
 

src/history.c

@@ -781,11 +781,14 @@ static void bc_history_refresh(BcHistory *h) {
 	if (pos >= h->buf.len - extras_len)
 		bc_vec_grow(&h->buf, pos + extras_len);
 
-	// Move cursor to original position.
+	// Move cursor to original position. Do NOT move the putchar of '\r' to the
+	// printf with colpos. That causes a bug where the cursor will go to the end
+	// of the line when there is no prompt.
+	bc_file_putchar(&vm.fout, bc_flush_none, '\r');
 	colpos = bc_history_colPos(h->buf.v, len - extras_len, pos) + h->pcol;
 
 	// Set the cursor position again.
-	if (colpos) bc_file_printf(&vm.fout, "\r\x1b[%zuC", colpos);
+	if (colpos) bc_file_printf(&vm.fout, "\x1b[%zuC", colpos);
 
 	bc_file_flush(&vm.fout, bc_flush_none);
 }
@@ -1193,7 +1196,34 @@ static void bc_history_escape(BcHistory *h) {
 				if (BC_ERR(BC_HIST_READ(seq + 2, 1)))
 					bc_vm_fatalError(BC_ERR_FATAL_IO_ERR);
 
-				if (seq[2] == '~' && c == '3') bc_history_edit_delete(h);
+				if (seq[2] == '~') {
+
+					switch(c) {
+
+						case '1':
+						{
+							bc_history_edit_home(h);
+							break;
+						}
+
+						case '3':
+						{
+							bc_history_edit_delete(h);
+							break;
+						}
+
+						case '4':
+						{
+							bc_history_edit_end(h);
+							break;
+						}
+
+						default:
+						{
+							break;
+						}
+					}
+				}
 				else if(seq[2] == ';') {
 
 					// Read two characters into seq.

tests/script.sh

@@ -154,6 +154,21 @@ elif [ "$generate" -eq 0 ]; then
 	printf 'Skipping %s script %s\n' "$d" "$f"
 	exit 0
 else
+
+	set +e
+
+	# This is to check that the command exists. If not, we should not try to
+	# generate the test. Instead, we should just skip.
+	command -v "$d"
+	err="$?"
+
+	set -e
+
+	if [ "$err" -ne 0 ]; then
+		printf 'Could not find %s to generate results; skipping %s script %s\n' "$d" "$d" "$f"
+		exit 0
+	fi
+
 	# This sed, and the script, are to remove an incompatibility with GNU bc,
 	# where GNU bc is wrong. See the development manual
 	# (manuals/development.md#script-tests) for more information.