Move command line editing routines into src/utils/edit*.[ch]

This allows the same routines to be shared with other programs
since these are not really specific to wpa_cli.

src/utils/edit_simple.c

@@ -0,0 +1,90 @@
+/*
+ * Minimal command line editing
+ * Copyright (c) 2010, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "eloop.h"
+#include "edit.h"
+
+
+#define CMD_BUF_LEN 256
+static char cmdbuf[CMD_BUF_LEN];
+static int cmdbuf_pos = 0;
+
+static void *edit_cb_ctx;
+static void (*edit_cmd_cb)(void *ctx, char *cmd);
+static void (*edit_eof_cb)(void *ctx);
+
+
+static void edit_read_char(int sock, void *eloop_ctx, void *sock_ctx)
+{
+	int c;
+	unsigned char buf[1];
+	int res;
+
+	res = read(sock, buf, 1);
+	if (res < 0)
+		perror("read");
+	if (res <= 0) {
+		edit_eof_cb(edit_cb_ctx);
+		return;
+	}
+	c = buf[0];
+
+	if (c == '\r' || c == '\n') {
+		cmdbuf[cmdbuf_pos] = '\0';
+		cmdbuf_pos = 0;
+		edit_cmd_cb(edit_cb_ctx, cmdbuf);
+		printf("> ");
+		fflush(stdout);
+		return;
+	}
+
+	if (c >= 32 && c <= 255) {
+		if (cmdbuf_pos < (int) sizeof(cmdbuf) - 1) {
+			cmdbuf[cmdbuf_pos++] = c;
+		}
+	}
+}
+
+
+int edit_init(void (*cmd_cb)(void *ctx, char *cmd),
+	      void (*eof_cb)(void *ctx),
+	      void *ctx)
+{
+	edit_cb_ctx = ctx;
+	edit_cmd_cb = cmd_cb;
+	edit_eof_cb = eof_cb;
+	eloop_register_read_sock(STDIN_FILENO, edit_read_char, NULL, NULL);
+	return 0;
+}
+
+
+void edit_deinit(void)
+{
+	eloop_unregister_read_sock(STDIN_FILENO);
+}
+
+
+void edit_clear_line(void)
+{
+}
+
+
+void edit_redraw(void)
+{
+	cmdbuf[cmdbuf_pos] = '\0';
+	printf("\r> %s", cmdbuf);
+}