id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
345	"Multics C: Create a ""limits.h"" and other standard include files."	trnsz@…	Eric Swenson	"Multics C is ""C87"", i.e. enhanced K&R C.  This is a pre-standard pre-ANSI (pre-C89) superset of K&R C (C78), roughly compatible with circa-1987 PCC/SGS as distributed with AT&T System V.

Multics C includes a non-standard ""values.h"" which defines some pre-ANSI standard definitions such as BITSPERBYTE, etc.

We should create a standard ""limits.h"" file, the following would be a good start:

#include <values.h>
#define CHAR_BIT BITSPERBYTE
#define CHAR_WIDTH CHAR_BIT
#define CHAR_MIN -256
#define CHAR_MAX 255
#define SCHAR_MIN CHAR_MIN
#define SCHAR_MAX CHAR_MAX
#define UCHAR_MIN 0
#define UCHAR_MAX 511

This would take care of the char types.

https://en.cppreference.com/w/c/types/limits shows other things this file should include.  This would not interfere with or modify the existing non-standard ""values.h"".

This issue is mostly a placeholder for now - I intend to complete the limits.h to be C89 compliant, and provide some additional C89 headers as well."	enhancement	new	minor		Administration