From 2c6ef92d83b54b2a2a2203ee3860bc46a6c56341 Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Mon, 29 Jan 2001 09:34:43 +0000
Subject: I confess.  This is a truely nasty hack.  I am so ashamed! (I think
 config(8) source does bad things to your brain :-)

Clean up likely stray *.h files in the build directory.
Eg: if isa.h ceases being generated, zap it.
The heuristics to figure out a 'likely' file are pretty revolting.
---
 usr.sbin/config/main.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 57 insertions(+)

diff --git a/usr.sbin/config/main.c b/usr.sbin/config/main.c
index ed04c8d..520d4fa 100644
--- a/usr.sbin/config/main.c
+++ b/usr.sbin/config/main.c
@@ -55,6 +55,7 @@ static const char rcsid[] =
 #include <stdio.h>
 #include <sysexits.h>
 #include <unistd.h>
+#include <dirent.h>
 #include "y.tab.h"
 #include "config.h"
 
@@ -78,6 +79,7 @@ int	profiling;
 static void configfile(void);
 static void get_srcdir(void);
 static void usage(void);
+static void cleanheaders(char *, time_t);
 
 /*
  * Config builds a set of files for building a UNIX
@@ -90,6 +92,9 @@ main(int argc, char **argv)
 	struct stat buf;
 	int ch, len;
 	char *p;
+	time_t starttime;
+
+	starttime = time(0);
 
 	while ((ch = getopt(argc, argv, "d:gp")) != -1)
 		switch (ch) {
@@ -171,6 +176,7 @@ main(int argc, char **argv)
 	makefile();			/* build Makefile */
 	headers();			/* make a lot of .h files */
 	configfile();			/* put config file into kernel*/
+	cleanheaders(p, starttime);
 	printf("Kernel build directory is %s\n", p);
 	exit(0);
 }
@@ -409,3 +415,54 @@ moveifchanged(const char *from_name, const char *to_name)
 			err(EX_OSERR, "unlink(%s)", from_name);
 	}
 }
+
+static void
+cleanheaders(char *p, time_t starttime)
+{
+	DIR *dirp;
+	struct dirent *dp;
+	struct stat st;
+	struct file_list *fl;
+	int i;
+
+	starttime--;
+
+	/*
+	 * Scan the build directory and clean out stuff that looks like
+	 * it might have been a leftover NFOO header, etc.
+	 */
+	dirp = opendir(p);
+	while ((dp = readdir(dirp)) != NULL) {
+		i = dp->d_namlen - 2;
+		/* Skip non-headers */
+		if (dp->d_name[i] != '.' || dp->d_name[i + 1] != 'h')
+			continue;
+		/* Skip stuff that config created or examined in this pass */
+		if (stat(path(dp->d_name), &st) == -1)
+			err(1, "stat(%s)", dp->d_name);
+		if (st.st_mtime >= starttime || st.st_atime >= starttime ||
+		    st.st_ctime >= starttime)
+			continue;
+		/* Skip special stuff, eg: bus_if.h, but check opt_*.h */
+		if (index(dp->d_name, '_') &&
+		    strncmp(dp->d_name, "opt_", 4) != 0)
+			continue;
+		/* Some more magic names to skip. Sigh. */
+		if (strcmp(dp->d_name, "setdefs.h") == 0 ||
+		    strcmp(dp->d_name, "y.tab.h") == 0)
+			continue;
+		/* Check if it is a target file */
+		for (fl = ftab; fl != NULL; fl = fl->f_next) {
+			if (strcmp(dp->d_name, fl->f_fn) == 0) {
+				break;
+			}
+		}
+		if (fl)
+			continue;
+		printf("Removing stale header: %s\n", dp->d_name);
+		unlink(path(dp->d_name));
+	}
+	(void)closedir(dirp);
+
+}
+
-- 
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