From d350dea5f829353d05ce8f95f7cdc08a8a8f78b9 Mon Sep 17 00:00:00 2001
From: tmp64 <tmp32x2@gmail.com>
Date: Sat, 16 Dec 2023 10:27:15 +0700
Subject: [PATCH] Server: Split long HUD messages (#198)

Resolves #198
---
 src/game/server/util.cpp | 68 +++++++++++++++++++++++++++++++++++-----
 src/game/server/util.h   | 12 +++++++
 2 files changed, 72 insertions(+), 8 deletions(-)

diff --git a/src/game/server/util.cpp b/src/game/server/util.cpp
index 720b0d39..2613a90b 100644
--- a/src/game/server/util.cpp
+++ b/src/game/server/util.cpp
@@ -829,6 +829,12 @@ void UTIL_ScreenFade(CBaseEntity *pEntity, const Vector &color, float fadeTime,
 }
 
 void UTIL_HudMessage(CBaseEntity *pEntity, const hudtextparms_t &textparms, const char *pMessage)
+{
+	const char *splitMsg = UTIL_SplitHudMessage(pMessage);
+	UTIL_HudMessageRaw(pEntity, textparms, splitMsg);
+}
+
+void UTIL_HudMessageRaw(CBaseEntity *pEntity, const hudtextparms_t &textparms, const char *pMessage)
 {
 	if (!pEntity || !pEntity->IsNetClient())
 		return;
@@ -874,13 +880,13 @@ void UTIL_HudMessage(CBaseEntity *pEntity, const hudtextparms_t &textparms, cons
 
 void UTIL_HudMessageAll(const hudtextparms_t &textparms, const char *pMessage)
 {
-	int i;
+	const char *splitMsg = UTIL_SplitHudMessage(pMessage);
 
-	for (i = 1; i <= gpGlobals->maxClients; i++)
+	for (int i = 1; i <= gpGlobals->maxClients; i++)
 	{
 		CBaseEntity *pPlayer = UTIL_PlayerByIndex(i);
 		if (pPlayer)
-			UTIL_HudMessage(pPlayer, textparms, pMessage);
+			UTIL_HudMessageRaw(pPlayer, textparms, splitMsg);
 	}
 }
 
@@ -968,7 +974,48 @@ char *UTIL_dtos4(int d)
 	return buf;
 }
 
-void UTIL_ShowMessage(const char *pString, CBaseEntity *pEntity)
+char *UTIL_SplitHudMessage(const char *src)
+{
+	// Copied from AMX Mod X: https://github.com/alliedmodders/amxmodx/blob/27f451a868c3154a0ab0d4d70e0a650074fd485d/amxmodx/util.cpp#L148-L183
+	// Licensed under the GNU General Public License, version 3 or higher.
+	static char message[512];
+	short b = 0, d = 0, e = 0, c = -1;
+
+	while (src[d] && e < 480)
+	{
+		if (src[d] == ' ')
+		{
+			c = e;
+		}
+		else if (src[d] == '\n')
+		{
+			c = -1;
+			b = 0;
+		}
+
+		message[e++] = src[d++];
+
+		if (++b == 69)
+		{
+			if (c == -1)
+			{
+				message[e++] = '\n';
+				b = 0;
+			}
+			else
+			{
+				message[c] = '\n';
+				b = e - c - 1;
+				c = -1;
+			}
+		}
+	}
+
+	message[e] = 0;
+	return message;
+}
+
+void UTIL_ShowMessageRaw(const char *pString, CBaseEntity *pEntity)
 {
 	if (!pEntity || !pEntity->IsNetClient())
 		return;
@@ -978,17 +1025,22 @@ void UTIL_ShowMessage(const char *pString, CBaseEntity *pEntity)
 	MESSAGE_END();
 }
 
+void UTIL_ShowMessage(const char *pString, CBaseEntity *pEntity)
+{
+	const char *splitMsg = UTIL_SplitHudMessage(pString);
+	UTIL_ShowMessageRaw(splitMsg, pEntity);
+}
+
 void UTIL_ShowMessageAll(const char *pString)
 {
-	int i;
+	const char *splitMsg = UTIL_SplitHudMessage(pString);
 
 	// loop through all players
-
-	for (i = 1; i <= gpGlobals->maxClients; i++)
+	for (int i = 1; i <= gpGlobals->maxClients; i++)
 	{
 		CBaseEntity *pPlayer = UTIL_PlayerByIndex(i);
 		if (pPlayer)
-			UTIL_ShowMessage(pString, pPlayer);
+			UTIL_ShowMessageRaw(splitMsg, pPlayer);
 	}
 }
 
diff --git a/src/game/server/util.h b/src/game/server/util.h
index 2ec8cbbb..ac45e7eb 100644
--- a/src/game/server/util.h
+++ b/src/game/server/util.h
@@ -276,8 +276,19 @@ extern void UTIL_EmitAmbientSound(edict_t *entity, const Vector &vecOrigin, cons
 extern void UTIL_ParticleEffect(const Vector &vecOrigin, const Vector &vecDirection, ULONG ulColor, ULONG ulCount);
 extern void UTIL_ScreenShake(const Vector &center, float amplitude, float frequency, float duration, float radius);
 extern void UTIL_ScreenShakeAll(const Vector &center, float amplitude, float frequency, float duration);
+
+//! Splits any lines in a string longer than 68 characters.
+//! Not UTF-8-aware. Will split by words if possible.
+//! Prevents a client crash due to a buffer overflow.
+//! See tmp64/BugfixedHL-Rebased#198 and ValveSoftware/halflife#3705.
+//! @param  src		Original message text. Size after splitting is limited to 511 bytes.
+//! @returns Pointer to a static buffer.
+extern char *UTIL_SplitHudMessage(const char *src);
+
+extern void UTIL_ShowMessageRaw(const char *pString, CBaseEntity *pPlayer);
 extern void UTIL_ShowMessage(const char *pString, CBaseEntity *pPlayer);
 extern void UTIL_ShowMessageAll(const char *pString);
+
 extern void UTIL_ScreenFadeAll(const Vector &color, float fadeTime, float holdTime, int alpha, int flags);
 extern void UTIL_ScreenFade(CBaseEntity *pEntity, const Vector &color, float fadeTime, float fadeHold, int alpha, int flags);
 
@@ -376,6 +387,7 @@ typedef struct hudtextparms_s
 // prints as transparent 'title' to the HUD
 extern void UTIL_HudMessageAll(const hudtextparms_t &textparms, const char *pMessage);
 extern void UTIL_HudMessage(CBaseEntity *pEntity, const hudtextparms_t &textparms, const char *pMessage);
+extern void UTIL_HudMessageRaw(CBaseEntity *pEntity, const hudtextparms_t &textparms, const char *pMessage);
 
 // for handy use with ClientPrint params
 extern char *UTIL_dtos1(int d);