Integer limits (limits.h)

Include limits.h for the integer type ranges used by the DCC C Compiler target model.

Macros

Name	Meaning
INT_MAX	Maximum value of signed int.
INT_MIN	Minimum value of signed int.
SHRT_MAX	Maximum value of signed short.
SHRT_MIN	Minimum value of signed short.
USHRT_MAX	Maximum value of unsigned short.
UINT_MAX	Maximum value of unsigned int.
LONG_MIN	Minimum value of signed long.
LONG_MAX	Maximum value of signed long.
ULONG_MAX	Maximum value of unsigned long.
UINT32_MAX	Maximum value of uint32_t.
CHAR_BIT	Number of bits in a char.
SCHAR_MIN	Minimum value of signed char.
SCHAR_MAX	Maximum value of signed char.
UCHAR_MAX	Maximum value of unsigned char.
CHAR_MIN	Minimum value of plain char.
CHAR_MAX	Maximum value of plain char.

Runtime model

The DCC C Compiler uses 8-bit char, 16-bit short and int, and 32-bit long. Plain char is signed, so CHAR_MIN and CHAR_MAX match SCHAR_MIN and SCHAR_MAX.

The header also provides UINT32_MAX for compatibility with code that uses the 32-bit unsigned limit name alongside stdint.h.

The runtime uses a fixed single-byte C/ASCII locale (MB_CUR_MAX is 1 in stdlib.h). limits.h does not currently define MB_LEN_MAX.

Range choices

Use long or unsigned long when values can exceed the 16-bit int range:

#include <limits.h>
#include <stdio.h>

long total = 0;
if (total > INT_MAX)
    puts("needs long formatting");

For formatted output of 32-bit values, use the l length modifier. Literal formats are detected automatically; -fl / -flongio only forces long-format support on every call. See Console and file I/O.