From 24818b238155dc7797f14b471b63c789e6f3bb1a Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Fri, 1 Nov 2024 20:48:43 +0100
Subject: Allow building without readline support for irecovery tool

---
 configure.ac      | 11 ++++++-----
 tools/irecovery.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 60 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index 06a27d0..4507e85 100644
--- a/configure.ac
+++ b/configure.ac
@@ -96,16 +96,17 @@ if test "$ac_cv_attribute_constructor" = "yes"; then
 fi
 
 AC_ARG_WITH([tools],
-	[AS_HELP_STRING([--with-tools], [Build irecovery tools. (requires readline) [default=yes]])],
+	[AS_HELP_STRING([--with-tools], [Build irecovery tools. [default=yes]])],
 	[],
 	[with_tools=yes])
 
 AS_IF([test "x$with_tools" = "xyes"], [
 	AC_DEFINE(BUILD_TOOLS, 1, [Define if we are building irecovery tools])
-	AC_CHECK_HEADERS([readline/readline.h], [],
-		[AC_MSG_ERROR([Please install readline development headers])]
-	)]
-)
+	AC_CHECK_HEADERS([readline/readline.h],
+		[AC_DEFINE(HAVE_READLINE, 1, [Define if readline is available])],
+		[AC_MSG_NOTICE([NOTE: Building without readline support. If you want readline support, install its development package.])]
+	)
+])
 AM_CONDITIONAL(BUILD_TOOLS, test "x$with_tools" = "xyes")
 
 AC_ARG_WITH([dummy],
diff --git a/tools/irecovery.c b/tools/irecovery.c
index 61d053a..f527c44 100644
--- a/tools/irecovery.c
+++ b/tools/irecovery.c
@@ -31,12 +31,20 @@
 #include <string.h>
 #include <getopt.h>
 #include <inttypes.h>
+#include <ctype.h>
 #include <libirecovery.h>
+#ifdef HAVE_READLINE
 #include <readline/readline.h>
 #include <readline/history.h>
+#else
+#ifndef WIN32
+#include <termios.h>
+#endif
+#endif
 
 #ifdef WIN32
 #include <windows.h>
+#include <conio.h>
 #ifndef sleep
 #define sleep(n) Sleep(1000 * n)
 #endif
@@ -271,15 +279,49 @@ static void parse_command(irecv_client_t client, unsigned char* command, unsigne
 
 static void load_command_history()
 {
+#ifdef HAVE_READLINE
 	read_history(FILE_HISTORY_PATH);
+#endif
 }
 
-static void append_command_to_history(char* cmd)
+static void append_command_to_history(const char* cmd)
 {
+#ifdef HAVE_READLINE
 	add_history(cmd);
 	write_history(FILE_HISTORY_PATH);
+#endif
 }
 
+#ifndef HAVE_READLINE
+#ifdef WIN32
+#define BS_CC '\b'
+#else
+#define BS_CC 0x7f
+#define getch getchar
+#endif
+static void get_input(char *buf, int maxlen)
+{
+	int len = 0;
+	int c;
+
+	while ((c = getch())) {
+		if ((c == '\r') || (c == '\n')) {
+			break;
+		}
+		if (isprint(c)) {
+			if (len < maxlen-1)
+				buf[len++] = c;
+		} else if (c == BS_CC) {
+			if (len > 0) {
+				fputs("\b \b", stdout);
+				len--;
+			}
+		}
+	}
+	buf[len] = 0;
+}
+#endif
+
 static void init_shell(irecv_client_t client)
 {
 	irecv_error_t error = 0;
@@ -294,8 +336,15 @@ static void init_shell(irecv_client_t client)
 			debug("%s\n", irecv_strerror(error));
 			break;
 		}
-
+#ifdef HAVE_READLINE
 		char* cmd = readline("> ");
+#else
+		char cmdbuf[4096];
+		const char* cmd = &cmdbuf[0];
+		printf("> ");
+		fflush(stdout);
+		get_input(cmdbuf, sizeof(cmdbuf));
+#endif
 		if (cmd && *cmd) {
 			if (_is_breq_command(cmd)) {
 				error = irecv_send_command_breq(client, cmd, 1);
@@ -307,8 +356,10 @@ static void init_shell(irecv_client_t client)
 			}
 
 			append_command_to_history(cmd);
-			free(cmd);
 		}
+#ifdef HAVE_READLINE
+		free(cmd);
+#endif
 	}
 }
 
-- 
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