number.h File Reference

Number module to parse numbers. More...

#include "state.h"

Go to the source code of this file.

Enumerations
enum	{   OPC_INVALID = 0xff, MAP_MAX_KEY_LEN = 32, NUMBER_ERROR = -1, NUMBER_LABEL_NODEF = -2,   STATE_MAX_STRING_LEN = 32, TOKEN_BUFFER_SIZE = 100, TOKEN_SOURCE_FILE_SIZE = 32 }

Functions
int	number_get_number (State *s, char *str)
	interpret a string as a constant, label or number More...
int	number_char_to_digit (char c)
	Convert a hex char to a digit. More...

Detailed Description

Number module to parse numbers.

Handles number in decimal and hex, labels, constants and modifiers

Definition in file number.h.

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
OPC_INVALID	An invalid opcode to signal invalid / non-existent variations.
MAP_MAX_KEY_LEN	Key buffer size for Map.
NUMBER_ERROR	Could not parse a number or constant is undefined.
NUMBER_LABEL_NODEF	Undefined label.
STATE_MAX_STRING_LEN	max string length for input/output files
TOKEN_BUFFER_SIZE	Token max length.
TOKEN_SOURCE_FILE_SIZE	source filename max length. Longer strings will get truncated.

Definition at line 13 of file number.h.

     {
    NUMBER_ERROR = -1,
    NUMBER_LABEL_NODEF = -2,
};

Function Documentation

number_char_to_digit()

int number_char_to_digit

(

char

c

)

Convert a hex char to a digit.

Parameters

c	char to convert

Returns

value or NUMBER_ERROR on some error

Handles upper or lowercase chars
Returns NUMBER_ERROR on failed conversion

Definition at line 12 of file number.c.

                                 {
    if ('0' <= c && c <= '9')
        return c - '0';
    if ('a' <= c && c <= 'f')
        c += 'A' - 'a';
    if ('A' <= c && c <= 'F')
        return c - 'A' + 10;
    return NUMBER_ERROR;
}

References NUMBER_ERROR.

Referenced by instruction_load(), and number_parse_number().

number_get_number()

int number_get_number	(	State *	s,
		char *	str
	)

interpret a string as a constant, label or number

Parameters

s	State to read constant / label values from
str	string to interpret

• get the value of a constant or label
• parse number
• handles modifier symbols
  Returns NUMBER_ERROR on error, or NUMBER_LABEL_NODEF if number is a valid label with no value

Definition at line 75 of file number.c.

                                           {
 
    int p = (str[0] == '>' || str[0] == '<') ? 1 : 0;
    int num = number_get_raw(s, &str[p]);
 
    if (num < 0) return num;
 
    num = str[0] == '>' ? num >> 8 : num;
    num &= str[0] == '>' || str[0] == '<' ? 0xff : 0xffff;
 
    return num;
}

References number_get_raw().

Referenced by compile_data(), compile_pad(), and token_get_operand().