From bfd58e2c515e8c360fda4bee3d0702c60d92ebf0 Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Tue, 2 Dec 2025 18:24:54 +0100
Subject: preprocessor: add #ifndef...#endif include guard optimization

---
 io.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 58ebf17..1721f7b 100644
--- a/io.c
+++ b/io.c
@@ -818,6 +818,7 @@ static struct file {
    vec_of(uint) lineoffs;
    bool once;
    bool seen;
+   const char *guardmac;
 } *fileht[1<<SPANFILEBITS];
 static int nfiles;
 
@@ -913,19 +914,21 @@ getfilepos(int *line, int *col, int id, uint off)
 }
 
 bool
-isoncefile(int id)
+isoncefile(int id, const char **guard)
 {
    assert(id < arraylength(fileht) && fileht[id]);
+   *guard = fileht[id]->guardmac;
    return fileht[id]->once;
 }
+
 void
-markfileonce(int id)
+markfileonce(int id, const char *guard)
 {
    assert(id < arraylength(fileht) && fileht[id]);
    fileht[id]->once = 1;
+   fileht[id]->guardmac = guard;
 }
 
-
 void
 markfileseen(int id)
 {
-- 
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