+struct symtab;
+
+/* See openp function definition for their description. */
+
+enum openp_flag
+{
+ OPF_TRY_CWD_FIRST = 0x01,
+ OPF_SEARCH_IN_PATH = 0x02,
+ OPF_RETURN_REALPATH = 0x04,
+};
+
+DEF_ENUM_FLAGS_TYPE(openp_flag, openp_flags);
+
+extern int openp (const char *, openp_flags, const char *, int,
+ gdb::unique_xmalloc_ptr<char> *);
+
+extern int source_full_path_of (const char *, gdb::unique_xmalloc_ptr<char> *);
+
+extern void mod_path (const char *, char **);
+
+extern void add_path (const char *, char **, int);
+
+extern void directory_switch (const char *, int);
+
+extern char *source_path;
+
+extern void init_source_path (void);
+
+/* This function is capable of finding the absolute path to a
+ source file, and opening it, provided you give it a FILENAME. Both the
+ DIRNAME and FULLNAME are only added suggestions on where to find the file.
+
+ FILENAME should be the filename to open.
+ DIRNAME is the compilation directory of a particular source file.
+ Only some debug formats provide this info.
+ FULLNAME can be the last known absolute path to the file in question.
+ Space for the path must have been malloc'd. If a path substitution
+ is applied we free the old value and set a new one.
+
+ On Success
+ A valid file descriptor is returned (the return value is positive).
+ FULLNAME is set to the absolute path to the file just opened.
+ The caller is responsible for freeing FULLNAME.
+
+ On Failure
+ An invalid file descriptor is returned (the return value is negative).
+ FULLNAME is set to NULL. */
+extern int find_and_open_source (const char *filename,
+ const char *dirname,
+ gdb::unique_xmalloc_ptr<char> *fullname);
+