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Added zilog/intel style hex numbers

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3242 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2004-10-11 19:01:51 +00:00
parent 843c183698
commit d204e4a1ad
2 changed files with 63 additions and 24 deletions
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8
doc/ca65.sgml
View File

@ -402,10 +402,10 @@ name="http://www.6502.org/source/interpreters/sweet16.htm">.
<sect1>Number format<p>
For literal values, the assembler accepts the widely used number formats:
A preceeding '&dollar;' denotes a hex value, a preceeding '%' denotes a
binary value, and a bare number is interpeted as a decimal. There are
currently no octal values and no floats.
For literal values, the assembler accepts the widely used number formats: A
preceeding '&dollar;' or a trailing 'h' denotes a hex value, a preceeding '%'
denotes a binary value, and a bare number is interpeted as a decimal. There
are currently no octal values and no floats.
<sect1>Conditional assembly<p>

79
src/ca65/scanner.c
View File

@ -72,19 +72,15 @@
enum Token Tok = TOK_NONE; /* Current token */
int WS; /* Flag: Whitespace before token */
long IVal; /* Integer token attribute */
char SVal [MAX_STR_LEN+1]; /* String token attribute */
char SVal[MAX_STR_LEN+1]; /* String token attribute */
FilePos CurPos = { 0, 0, 0 }; /* Name and position in current file */
/* Struct to handle include files. Note: The length of the input line may
* not exceed 255+1, since the column is stored in the file position struct
* as a character. Increasing this value means changing the FilePos struct,
* and the read and write routines in the assembler and linker.
*/
typedef struct InputFile_ InputFile;
struct InputFile_ {
/* Struct to handle include files. */
typedef struct InputFile InputFile;
struct InputFile {
FILE* F; /* Input file descriptor */
FilePos Pos; /* Position in file */
enum Token Tok; /* Last token */
@ -94,8 +90,8 @@ struct InputFile_ {
};
/* Struct to handle textual input data */
typedef struct InputData_ InputData;
struct InputData_ {
typedef struct InputData InputData;
struct InputData {
char* Data; /* Pointer to the data */
const char* Pos; /* Pointer to current position */
int Malloced; /* Memory was malloced */
@ -111,7 +107,7 @@ static unsigned ICount = 0; /* Count of input files */
static int C = 0; /* Current input character */
/* Force end of assembly */
int ForcedEnd = 0;
int ForcedEnd = 0;
/* List of dot keywords with the corresponding tokens */
struct DotKeyword {
@ -752,19 +748,62 @@ Again:
return;
}
/* Decimal number? */
/* Number? */
if (IsDigit (C)) {
/* Read the number */
char Buf[16];
unsigned Digits;
unsigned Base;
unsigned I;
long Max;
unsigned DVal;
/* Ignore leading zeros */
while (C == '0') {
NextChar ();
}
/* Read the number into Buf counting the digits */
Digits = 0;
while (IsXDigit (C)) {
/* Buf is big enough to allow any decimal and hex number to
* overflow, so ignore excess digits here, they will be detected
* when we convert the value.
*/
if (Digits < sizeof (Buf)) {
Buf[Digits++] = C;
}
NextChar ();
}
/* Allow zilog/intel style hex numbers with a 'h' suffix */
if (C == 'h' || C == 'H') {
NextChar ();
Base = 16;
Max = 0xFFFFFFFFUL / 16;
} else {
Base = 10;
Max = 0xFFFFFFFFUL / 10;
}
/* Convert the number using the given base */
IVal = 0;
while (IsDigit (C)) {
if (IVal > (long) (0xFFFFFFFFUL / 10)) {
Error ("Overflow in decimal number");
IVal = 0;
for (I = 0; I < Digits; ++I) {
if (IVal > Max) {
Error ("Number out of range");
IVal = 0;
break;
}
IVal = (IVal * 10) + DigitVal (C);
NextChar ();
}
DVal = DigitVal (Buf[I]);
if (DVal > Base) {
Error ("Invalid digits in number");
IVal = 0;
break;
}
IVal = (IVal * Base) + DVal;
}
/* This is an integer constant */
Tok = TOK_INTCON;