From 853cb79cc31a765fa763109d3631e3b96825288b Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Fri, 21 Feb 2025 22:52:59 -0500
Subject: Smoothen input handling, prevent overlapping text

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 src/client/client.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 54 insertions(+), 8 deletions(-)

diff --git a/src/client/client.c b/src/client/client.c
index f8d3b9a..732cae1 100644
--- a/src/client/client.c
+++ b/src/client/client.c
@@ -34,6 +34,7 @@
 #include <string.h>
 #include <signal.h>
 #include <pthread.h>
+#include <termios.h>
 
 // #define CENTRAL_SERVER "127.0.0.1"
 #define CENTRAL_SERVER "149.248.6.149"
@@ -41,7 +42,29 @@
 static struct ostp_session s;
 static pthread_t td;
 static volatile int got_thread = 0;
+static char input[512];
+static size_t input_i = 0;
+static struct termios orig_termios;
 
+static void
+enable_raw_mode(void)
+{
+    struct termios raw;
+
+    tcgetattr(STDIN_FILENO, &orig_termios);
+    raw = orig_termios;
+    raw.c_lflag &= ~(ICANON | ECHO);
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw);
+
+    raw.c_lflag &= ~(ECHO | ICANON | ISIG);
+    raw.c_cflag |= (CS8);
+}
+
+static void
+disable_raw_mode(void)
+{
+    tcsetattr(STDIN_FILENO, TCSAFLUSH, &orig_termios);
+}
 static void *
 recv_td(void *args)
 {
@@ -53,7 +76,7 @@ recv_td(void *args)
             printf("session_recv() failure\n");
             return NULL;
         }
-        printf("%s\n>> ", buf);
+        printf("\n\033[1F\033[2K%s\n>> %s", buf, input);
         fflush(stdout);
     }
 }
@@ -72,11 +95,11 @@ sighandle(int dmmy)
 int
 main(int argc, char **argv)
 {
-    int c, error;
-    char input[2048];
-    char send_buf[2048];
+    int error;
+    char c, send_buf[2048];
     size_t len;
 
+    tcgetattr(STDIN_FILENO, &orig_termios);
     setbuf(stdin, NULL);
     setbuf(stdout, NULL);
     signal(SIGINT, sighandle);
@@ -92,17 +115,40 @@ main(int argc, char **argv)
         return error;
     }
 
+    atexit(disable_raw_mode);
+    enable_raw_mode();
+
     while (1) {
         printf(">> ");
-        fflush(stdout);
 
-        if (fgets(input, sizeof(input), stdin) == NULL) {
-            printf("\n");
-            continue;
+        while (read(STDIN_FILENO, &c, 1)) {
+            if (c == 0x7F && input_i == 0) {
+                continue;
+            } else if (c == 0x7F && input_i > 0) {
+                input[input_i--] = '\0';
+                printf("\b ", input_i);
+                continue;
+            }
+
+            /* Stop reading if newline */
+            if (c == '\n') {
+                input_i = 0;
+                printf("\n");
+                break;
+            }
+
+            if (input_i >= sizeof(input)) {
+                continue;
+            }
+
+            input[input_i++] = c;
+            input[input_i] = '\0';
+            printf("%c", c);
         }
 
         input[strcspn(input, "\n")] = '\0';
         snprintf(send_buf, sizeof(send_buf), "%s: %s", s.username, input);
+        input[0] = '\0';
         session_send(send_buf, strlen(send_buf) + 1, &s);
     }
 
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