4.4BSD/usr/src/contrib/gdb-4.7.lbl/include/fopen-same.h

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/* Macros for the 'type' part of an fopen, freopen or fdopen. 

	<Read|Write>[Update]<Binary file|text file>

   This version is for "same" systems, where text and binary files are
   the same.  An example is Unix.  Many Unix systems could also add a
   "b" to the string, indicating binary files, but some reject this
   (and thereby don't conform to ANSI C, but what else is new?).

   This file is designed for inclusion by host-dependent .h files.  No
   user application should include it directly, since that would make
   the application unable to be configured for both "same" and "binary"
   variant systems.  */

#define FOPEN_RB	"r"
#define FOPEN_WB 	"w"
#define FOPEN_AB 	"a"
#define FOPEN_RUB 	"r+"
#define FOPEN_WUB 	"w+"
#define FOPEN_AUB 	"a+"

#define FOPEN_RT	"r"
#define FOPEN_WT 	"w"
#define FOPEN_AT 	"a"
#define FOPEN_RUT 	"r+"
#define FOPEN_WUT 	"w+"
#define FOPEN_AUT 	"a+"