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Enforce trailing slash in include paths
Fixes rednex#456

--- a/src/asm/fstack.c

+++ b/src/asm/fstack.c

@@ -316,7 +316,11 @@

 	if (NextIncPath == MAXINCPATHS)

 		fatalerror("Too many include directories passed from command line");

-	if (snprintf(IncludePaths[NextIncPath++], _MAX_PATH, "%s",

+	// Find last occurrence of slash; is it at the end of the string?

+	char const *lastSlash = strrchr(s, '/');

+	char const *pattern = lastSlash && *(lastSlash + 1) == 0 ? "%s" : "%s/";

+

+	if (snprintf(IncludePaths[NextIncPath++], _MAX_PATH, pattern,

 		     s) >= _MAX_PATH)

 		fatalerror("Include path too long '%s'", s);

 }