utils: add new tool xash-clang-format, a wrapper around clang-format that adds our formatting extensions

utils/xash-clang-format/proc.c

@@ -0,0 +1,99 @@
+/*
+proc.c - subprocess utilities
+Copyright (C) 2026 Xash3D FWGS contributors
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+*/
+#include <errno.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include "xcf.h"
+
+/*
+============
+RunCapture
+
+Spawn argv as a child, capture stdout into `out`.
+============
+*/
+int RunCapture( char *const argv[], xcf_buf_t *out, qboolean silent_stderr )
+{
+	int p[2];
+	pid_t pid;
+	char buf[8192];
+	int status;
+
+	if( pipe( p ) < 0 )
+		return -1;
+
+	pid = fork();
+	if( pid < 0 )
+	{
+		close( p[0] );
+		close( p[1] );
+		return -1;
+	}
+
+	if( pid == 0 )
+	{
+		close( p[0] );
+		dup2( p[1], STDOUT_FILENO );
+		close( p[1] );
+		if( silent_stderr )
+		{
+			int devnull = open( "/dev/null", O_WRONLY );
+
+			if( devnull >= 0 )
+			{
+				dup2( devnull, STDERR_FILENO );
+				close( devnull );
+			}
+		}
+		execvp( argv[0], argv );
+		_exit( 127 );
+	}
+
+	close( p[1] );
+
+	for( ;; )
+	{
+		ssize_t r = read( p[0], buf, sizeof( buf ));
+
+		if( r < 0 )
+		{
+			if( errno == EINTR )
+				continue;
+			break;
+		}
+		if( r == 0 )
+			break;
+		if( !BufPutMem( out, buf, r ))
+		{
+			close( p[0] );
+			kill( pid, SIGKILL );
+			waitpid( pid, NULL, 0 );
+			return -1;
+		}
+	}
+	close( p[0] );
+
+	if( waitpid( pid, &status, 0 ) < 0 )
+		return -1;
+
+	// heh wife excited
+	if( WIFEXITED( status ))
+		return WEXITSTATUS( status );
+
+	return -1;
+}