[PATCH] pre-proc: do some path normalization

[Luc Van Oostenryck <luc.vanoostenryck@gmail.com>]

An header file like 'header.h':
	#pragma once
	#include "./header.h"

doesn't work because:
1) both filenames are different, so it will be be included anyway
2) after that it will be included again under the name "././header.h"
   and so on until it eventually fails with ENAMETOOLONG.

Prevent this by stripping leading "./"s in the paths.
This is not good enough for testing file equivalence by is enough to
avoid the loop.

Link: https://lore.kernel.org/r/CAHk-=wjFWZMVWTbvUMVxQqGKvGMC_BNrahCtTkpEjxoC0k-T=A@mail.gmail.com
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
---
 pre-process.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pre-process.c b/pre-process.c
index 7a1478f6a0f1..3fb250828fa6 100644
--- a/pre-process.c
+++ b/pre-process.c
@@ -884,6 +884,12 @@ static void set_stream_include_path(struct stream *stream)
 			memcpy(m, stream->name, len);
 			m[len] = 0;
 			path = m;
+			/* normalize this path */
+			while (path[0] == '.' && path[1] == '/') {
+				path += 2;
+				while (path[0] == '/')
+					path++;
+			}
 		}
 		stream->path = path;
 	}
-- 
2.30.0