cc79022c128caab81ba5686174b0085ce480259f
kent
  Wed Oct 27 17:53:19 2010 -0700
Adding new function pathRelativeToFile
diff --git src/inc/filePath.h src/inc/filePath.h
index 2214cd1..ca4ddb5 100644
--- src/inc/filePath.h
+++ src/inc/filePath.h
@@ -2,20 +2,30 @@
 #ifndef FILEPATH_H
 #define FILEPATH_H
 
 #include "common.h"
 
 void splitPath(char *path, char dir[PATH_LEN], char name[FILENAME_LEN],
 	       char extension[FILEEXT_LEN]);
 /* Split a full path into components.  The dir component will include the
  * trailing / if any.  The extension component will include the starting
  * . if any.   Pass in NULL for dir, name, or extension if you don't care about
  * that part. */
 
 char *expandRelativePath(char *baseDir, char *relPath);
 /* Expand relative path to more absolute one. */
 
+char *pathRelativeToFile(char *baseFile, char *relPath);
+/* Given a base file name and a path relative to that, return
+ * relative path interpreted as if it were seen from the
+ * same directory holding the baseFile.  
+ *   An example of using this would be in processing include
+ * files.  In this case the baseFile would be the current
+ * source file, and the relPath would be from the include
+ * statement.  The returned result could then be used to
+ * open the include file. */
+
 void undosPath(char *path);
 /* Convert '\' to '/' in path. (DOS/Windows is typically ok with
  * this actually.) */
 
 #endif /* FILEPATH_H */