further work on soundlib support code

move some inline code into functions
replace some magic numbers

The mingw code is not tested yet.

include/extern.h

@@ -2615,6 +2615,8 @@ extern void get_soundlib_name(char *dest, int maxlen);
 #ifdef SND_SOUNDEFFECTS_AUTOMAP
 extern char *get_sound_effect_filename(int32_t seidint,
                                        char *buf, size_t bufsz, int32_t);
+extern char *base_soundname_to_filename(char *basename, char *buf,
+                                       size_t bufsz, int32_t baseflag);
 #endif
 
 /* ### sp_lev.c ### */

include/sndprocs.h

@@ -414,4 +414,16 @@ SoundAchievement(0, sa2_xpleveldown, level);
 #define SOUNDLIBONLY UNUSED
 #endif
 
+enum findsound_approaches {
+    findsound_embedded,
+    findsound_soundfile
+};
+
+enum sound_file_flags {
+    sff_default,            /* add dir prefix + '/' + sound + suffix */
+    sff_base_only,          /* base sound name only, no dir, no suffix */
+    sff_havedir_append_rest, /* dir provided, append base sound name + suffix */
+    sff_baseknown_add_rest /* base is already known, add dir and suffix */
+};
+
 #endif /* SNDPROCS_H */

include/windconf.h

@@ -92,6 +92,7 @@
 #define INTERJECTION_TYPES (INTERJECT_PANIC + 1)
 extern void interject_assistance(int, int, genericptr_t, genericptr_t);
 extern void interject(int);
+extern char *windows_exepath(void);
 
 /*
  *===============================================
@@ -119,7 +120,6 @@ extern errno_t tmpfile_s(FILE * restrict * restrict streamptr);
 #define __USE_MINGW_ANSI_STDIO 1
 #endif
 /* extern int getlock(void); */
-extern char *mingw_exepath(void);
 #endif   /* __MINGW32__ */
 
 #ifdef _MSC_VER