number.c File Reference

implement number module functions More...

#include <string.h>
#include "number.h"
#include "logging.h"

Go to the source code of this file.

Functions
int	number_char_to_digit (char c)
	Convert a hex char to a digit. More...
int	number_parse_number (char *str)
	interpret a string as a decimal or hex number More...
int	number_get_raw (State *s, char *str)
	interpret number without modifiers More...
int	number_get_number (State *s, char *str)
	interpret a string as a constant, label or number More...

Detailed Description

implement number module functions

Definition in file number.c.

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().

number_get_raw()

int number_get_raw	(	State *	s,
		char *	str
	)

interpret number without modifiers

Parameters

s	state to read from
str	string to interpret

Resolves labels & constants, parses numbers
Does not interpret modifiers

Definition at line 62 of file number.c.

                                        {
    if (str[0] == '@' || str[0] == '&') {
        Map* m = str[0] == '@' ? s->defines : s->labels;
        int n = map_get(m, &str[1]);
        if (n < 0) {
            return str[0] == '@' ? NUMBER_ERROR : NUMBER_LABEL_NODEF;
        }
        return n;
    }
    // pass error (NUMBER_ERROR value)
    return number_parse_number(str);
}

References State::defines, State::labels, Map::map_get(), NUMBER_ERROR, NUMBER_LABEL_NODEF, and number_parse_number().

Referenced by number_get_number().

number_parse_number()

int number_parse_number

(

char *

str

)

interpret a string as a decimal or hex number

Parameters

str	string to interpret

Returns

string as a number or NUMBER_ERROR

This one only parses decimals and hexes without any modifiers

Definition at line 30 of file number.c.

                                   {
    int count = strlen(str);
 
    int base = 10;
    int ptr = 0;
    int num = 0;
    if (str[0] == '$') {
        base = 16;
        ptr++;
    }
    while (ptr < count) {
        num *= base;
        int digit = number_char_to_digit(str[ptr]);
        if (digit == NUMBER_ERROR || digit >= base) {
            ERROR("Can not interpret number: '%.*s'\n", count, str);
            return NUMBER_ERROR;
        }
 
        num += digit;
        ptr++;
    }
    return num;
}

References ERROR, number_char_to_digit(), and NUMBER_ERROR.

Referenced by number_get_raw().