--- a/th_ioctx.h	Wed Dec 07 11:58:54 2022 +0200
+++ b/th_ioctx.h	Wed Dec 07 12:14:39 2022 +0200
@@ -31,10 +31,10 @@
 typedef struct th_ioctx
 {
     char *filename;     ///< Context filename, if any. May be NULL.
-    BOOL fallocated;    ///< TRUE if filename is allocated, FALSE if "const"
+    bool fallocated;    ///< true if filename is allocated, false if "const"
     char *mode;         ///< Context's stdio open "mode", may also be NULL.
-    BOOL mallocated;    ///< TRUE if mode string is allocated, FALSE if "const"
-    BOOL allocated;     ///< TRUE if this structure has been allocated
+    bool mallocated;    ///< true if mode string is allocated, false if "const"
+    bool allocated;     ///< true if this structure has been allocated
 
     void *data;         ///< Internal data
     time_t atime;       ///< Last access time
@@ -49,8 +49,8 @@
     size_t minAlloc;    ///< Minimum allocation increase (0 = default)
     off_t  memOffset;   ///< Current offset in data
     uint8_t *memData;   ///< Pointer to data
-    BOOL   memFree;     ///< TRUE = free the allocated memory on thfclose(), FALSE = no
-    BOOL   memWrite;    ///< TRUE = memory can be written to / expanded etc. FALSE = no
+    bool   memFree;     ///< true = free the allocated memory on thfclose(), false = no
+    bool   memWrite;    ///< true = memory can be written to / expanded etc. false = no
 
     // Message functions
     void (*error)(struct th_ioctx *ctx, const int err, const char *msg);
@@ -72,7 +72,7 @@
     int     (*fseek)(th_ioctx *ctx, const off_t, const int whence);
     off_t   (*fsize)(th_ioctx *ctx);
     off_t   (*ftell)(th_ioctx *ctx);
-    BOOL    (*feof)(th_ioctx *ctx);
+    bool    (*feof)(th_ioctx *ctx);
     int     (*fgetc)(th_ioctx *ctx);
     int     (*fputc)(int, th_ioctx *ctx);
     size_t  (*fread)(void *ptr, const size_t, const size_t, th_ioctx *ctx);
@@ -102,7 +102,7 @@
 
 void         th_io_init_stdio(th_ioctx *ctx, FILE *fh);
 
-BOOL         th_io_set_handlers(th_ioctx *ctx,
+bool         th_io_set_handlers(th_ioctx *ctx,
              void (*error)(th_ioctx *, const int, const char *msg),
              void (*msg)(th_ioctx *, const int, const char *msg));
 
@@ -125,7 +125,7 @@
 int          thfseek(th_ioctx *ctx, const off_t, const int whence);
 off_t        thfsize(th_ioctx *ctx);
 off_t        thftell(th_ioctx *ctx);
-BOOL         thfeof(th_ioctx *ctx);
+bool         thfeof(th_ioctx *ctx);
 int          thfgetc(th_ioctx *ctx);
 int          thfputc(int ch, th_ioctx *ctx);
 size_t       thfread(void *ptr, const size_t, const size_t, th_ioctx *ctx);
@@ -136,35 +136,35 @@
 int          thfprintf(th_ioctx *ctx, const char *fmt, ...)
              TH_ATTR_PRINTF_FMT(2, 3);
 
-BOOL         thfread_str(th_ioctx *ctx, void *ptr, const size_t len);
-BOOL         thfread_u8(th_ioctx *ctx, uint8_t *);
-BOOL         thfwrite_str(th_ioctx *ctx, const void *ptr, const size_t len);
-BOOL         thfwrite_u8(th_ioctx *ctx, const uint8_t);
+bool         thfread_str(th_ioctx *ctx, void *ptr, const size_t len);
+bool         thfread_u8(th_ioctx *ctx, uint8_t *);
+bool         thfwrite_str(th_ioctx *ctx, const void *ptr, const size_t len);
+bool         thfwrite_u8(th_ioctx *ctx, const uint8_t);
 
 
 //
 // Endian-handling file read/write routines
 //
-BOOL         thfwrite_ne16(th_ioctx *ctx, const uint16_t v);
-BOOL         thfwrite_ne32(th_ioctx *ctx, const uint32_t v);
-BOOL         thfwrite_ne64(th_ioctx *ctx, const uint64_t v);
-BOOL         thfread_ne16(th_ioctx *ctx, uint16_t *v);
-BOOL         thfread_ne32(th_ioctx *ctx, uint32_t *v);
-BOOL         thfread_ne64(th_ioctx *ctx, uint64_t *v);
+bool         thfwrite_ne16(th_ioctx *ctx, const uint16_t v);
+bool         thfwrite_ne32(th_ioctx *ctx, const uint32_t v);
+bool         thfwrite_ne64(th_ioctx *ctx, const uint64_t v);
+bool         thfread_ne16(th_ioctx *ctx, uint16_t *v);
+bool         thfread_ne32(th_ioctx *ctx, uint32_t *v);
+bool         thfread_ne64(th_ioctx *ctx, uint64_t *v);
 
-BOOL         thfwrite_le16(th_ioctx *ctx, const uint16_t v);
-BOOL         thfwrite_le32(th_ioctx *ctx, const uint32_t v);
-BOOL         thfwrite_le64(th_ioctx *ctx, const uint64_t v);
-BOOL         thfread_le16(th_ioctx *ctx, uint16_t *v);
-BOOL         thfread_le32(th_ioctx *ctx, uint32_t *v);
-BOOL         thfread_le64(th_ioctx *ctx, uint64_t *v);
+bool         thfwrite_le16(th_ioctx *ctx, const uint16_t v);
+bool         thfwrite_le32(th_ioctx *ctx, const uint32_t v);
+bool         thfwrite_le64(th_ioctx *ctx, const uint64_t v);
+bool         thfread_le16(th_ioctx *ctx, uint16_t *v);
+bool         thfread_le32(th_ioctx *ctx, uint32_t *v);
+bool         thfread_le64(th_ioctx *ctx, uint64_t *v);
 
-BOOL         thfwrite_be16(th_ioctx *ctx, const uint16_t v);
-BOOL         thfwrite_be32(th_ioctx *ctx, const uint32_t v);
-BOOL         thfwrite_be64(th_ioctx *ctx, const uint64_t v);
-BOOL         thfread_be16(th_ioctx *ctx, uint16_t *v);
-BOOL         thfread_be32(th_ioctx *ctx, uint32_t *v);
-BOOL         thfread_be64(th_ioctx *ctx, uint64_t *v);
+bool         thfwrite_be16(th_ioctx *ctx, const uint16_t v);
+bool         thfwrite_be32(th_ioctx *ctx, const uint32_t v);
+bool         thfwrite_be64(th_ioctx *ctx, const uint64_t v);
+bool         thfread_be16(th_ioctx *ctx, uint16_t *v);
+bool         thfread_be32(th_ioctx *ctx, uint32_t *v);
+bool         thfread_be64(th_ioctx *ctx, uint64_t *v);
 
 
 #ifdef __cplusplus