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b05c1e1111
cc65/src/ld65/scanner.c
cuz b05c1e1111 Use xsprintf in common library 
git-svn-id: svn://svn.cc65.org/cc65/trunk@32 b7a2c559-68d2-44c3-8de9-860c34a00d81
2000-06-08 18:18:40 +00:00

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/*****************************************************************************/
/* */
/* scanner.c */
/* */
/* Configuration file scanner for the ld65 linker */
/* */
/* */
/* */
/* (C) 1998-2000 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include "../common/xsprintf.h"
#include "global.h"
#include "error.h"
#include "scanner.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Current token and attributes */
unsigned CfgTok;
char CfgSVal [CFG_MAX_IDENT_LEN+1];
unsigned long CfgIVal;
/* Error location */
unsigned CfgErrorLine;
unsigned CfgErrorCol;
/* Input sources for the configuration */
static const char* CfgName = 0;
static const char* CfgBuf = 0;
/* Other input stuff */
static int C = ' ';
static unsigned InputLine = 1;
static unsigned InputCol = 0;
static FILE* InputFile = 0;
/*****************************************************************************/
/* Error handling */
/*****************************************************************************/
void CfgWarning (const char* Format, ...)
/* Print a warning message adding file name and line number of the config file */
{
char Buf [512];
va_list ap;
va_start (ap, Format);
xvsprintf (Buf, sizeof (Buf), Format, ap);
va_end (ap);
Warning ("%s(%u): %s", CfgName, CfgErrorLine, Buf);
}
void CfgError (const char* Format, ...)
/* Print an error message adding file name and line number of the config file */
{
char Buf [512];
va_list ap;
va_start (ap, Format);
xvsprintf (Buf, sizeof (Buf), Format, ap);
va_end (ap);
Error ("%s(%u): %s", CfgName, CfgErrorLine, Buf);
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
static void NextChar (void)
/* Read the next character from the input file */
{
if (CfgBuf) {
/* Read from buffer */
C = (unsigned char)(*CfgBuf);
if (C == 0) {
C = EOF;
} else {
++CfgBuf;
}
} else {
/* Read from the file */
C = getc (InputFile);
}
/* Count columns */
if (C != EOF) {
++InputCol;
}
/* Count lines */
if (C == '\n') {
++InputLine;
InputCol = 0;
}
}
static unsigned DigitVal (int C)
/* Return the value for a numeric digit */
{
if (isdigit (C)) {
return C - '0';
} else {
return toupper (C) - 'A' + 10;
}
}
void CfgNextTok (void)
/* Read the next token from the input stream */
{
unsigned I;
Again:
/* Skip whitespace */
while (isspace (C)) {
NextChar ();
}
/* Remember the current position */
CfgErrorLine = InputLine;
CfgErrorCol = InputCol;
/* Identifier? */
if (C == '_' || isalpha (C)) {
/* Read the identifier */
I = 0;
while (C == '_' || isalnum (C)) {
if (I < CFG_MAX_IDENT_LEN) {
CfgSVal [I++] = C;
}
NextChar ();
}
CfgSVal [I] = '\0';
CfgTok = CFGTOK_IDENT;
return;
}
/* Hex number? */
if (C == '$') {
NextChar ();
if (!isxdigit (C)) {
Error ("%s(%u): Hex digit expected", CfgName, InputLine);
}
CfgIVal = 0;
while (isxdigit (C)) {
CfgIVal = CfgIVal * 16 + DigitVal (C);
NextChar ();
}
CfgTok = CFGTOK_INTCON;
return;
}
/* Decimal number? */
if (isdigit (C)) {
CfgIVal = 0;
while (isdigit (C)) {
CfgIVal = CfgIVal * 10 + DigitVal (C);
NextChar ();
}
CfgTok = CFGTOK_INTCON;
return;
}
/* Other characters */
switch (C) {
case '{':
NextChar ();
CfgTok = CFGTOK_LCURLY;
break;
case '}':
NextChar ();
CfgTok = CFGTOK_RCURLY;
break;
case ';':
NextChar ();
CfgTok = CFGTOK_SEMI;
break;
case '.':
NextChar ();
CfgTok = CFGTOK_DOT;
break;
case ',':
NextChar ();
CfgTok = CFGTOK_COMMA;
break;
case '=':
NextChar ();
CfgTok = CFGTOK_EQ;
break;
case ':':
NextChar ();
CfgTok = CFGTOK_COLON;
break;
case '\"':
NextChar ();
I = 0;
while (C != '\"') {
if (C == EOF || C == '\n') {
Error ("%s(%u): Unterminated string", CfgName, InputLine);
}
if (I < CFG_MAX_IDENT_LEN) {
CfgSVal [I++] = C;
}
NextChar ();
}
NextChar ();
CfgSVal [I] = '\0';
CfgTok = CFGTOK_STRCON;
break;
case '#':
/* Comment */
while (C != '\n' && C != EOF) {
NextChar ();
}
if (C != EOF) {
goto Again;
}
CfgTok = CFGTOK_EOF;
break;
case '%':
NextChar ();
switch (C) {
case 'O':
NextChar ();
if (OutputName) {
strncpy (CfgSVal, OutputName, CFG_MAX_IDENT_LEN);
CfgSVal [CFG_MAX_IDENT_LEN] = '\0';
} else {
CfgSVal [0] = '\0';
}
CfgTok = CFGTOK_STRCON;
break;
case 'S':
NextChar ();
CfgIVal = StartAddr;
CfgTok = CFGTOK_INTCON;
break;
default:
CfgError ("Invalid format specification");
}
break;
case EOF:
CfgTok = CFGTOK_EOF;
break;
default:
Error ("%s(%u): Invalid character `%c'", CfgName, InputLine, C);
}
}
void CfgConsume (unsigned T, const char* Msg)
/* Skip a token, print an error message if not found */
{
if (CfgTok != T) {
CfgError (Msg);
}
CfgNextTok ();
}
void CfgConsumeSemi (void)
/* Consume a semicolon */
{
CfgConsume (CFGTOK_SEMI, "`;' expected");
}
void CfgConsumeColon (void)
/* Consume a colon */
{
CfgConsume (CFGTOK_COLON, "`:' expected");
}
void CfgOptionalComma (void)
/* Consume a comma if there is one */
{
if (CfgTok == CFGTOK_COMMA) {
CfgNextTok ();
}
}
void CfgOptionalAssign (void)
/* Consume an equal sign if there is one */
{
if (CfgTok == CFGTOK_EQ) {
CfgNextTok ();
}
}
void CfgAssureInt (void)
/* Make sure the next token is an integer */
{
if (CfgTok != CFGTOK_INTCON) {
CfgError ("Integer constant expected");
}
}
void CfgAssureStr (void)
/* Make sure the next token is a string constant */
{
if (CfgTok != CFGTOK_STRCON) {
CfgError ("String constant expected");
}
}
void CfgAssureIdent (void)
/* Make sure the next token is an identifier */
{
if (CfgTok != CFGTOK_IDENT) {
CfgError ("Identifier expected");
}
}
void CfgRangeCheck (unsigned long Lo, unsigned long Hi)
/* Check the range of CfgIVal */
{
if (CfgIVal < Lo || CfgIVal > Hi) {
CfgError ("Range error");
}
}
void CfgSpecialToken (const IdentTok* Table, unsigned Size, const char* Name)
/* Map an identifier to one of the special tokens in the table */
{
unsigned I;
/* We need an identifier */
if (CfgTok == CFGTOK_IDENT) {
/* Make it upper case */
I = 0;
while (CfgSVal [I]) {
CfgSVal [I] = toupper (CfgSVal [I]);
++I;
}
/* Linear search */
for (I = 0; I < Size; ++I) {
if (strcmp (CfgSVal, Table [I].Ident) == 0) {
CfgTok = Table [I].Tok;
return;
}
}
}
/* Not found or no identifier */
Error ("%s(%u): %s expected", CfgName, InputLine, Name);
}
void CfgBoolToken (void)
/* Map an identifier or integer to a boolean token */
{
static const IdentTok Booleans [] = {
{ "YES", CFGTOK_TRUE },
{ "NO", CFGTOK_FALSE },
{ "TRUE", CFGTOK_TRUE },
{ "FALSE", CFGTOK_FALSE },
};
/* If we have an identifier, map it to a boolean token */
if (CfgTok == CFGTOK_IDENT) {
CfgSpecialToken (Booleans, ENTRY_COUNT (Booleans), "Boolean");
} else {
/* We expected an integer here */
if (CfgTok != CFGTOK_INTCON) {
CfgError ("Boolean value expected");
}
CfgTok = (CfgIVal == 0)? CFGTOK_FALSE : CFGTOK_TRUE;
}
}
void CfgSetName (const char* Name)
/* Set a name for a config file */
{
CfgName = Name;
}
const char* CfgGetName (void)
/* Get the name of the config file */
{
return CfgName? CfgName : "";
}
void CfgSetBuf (const char* Buf)
/* Set a memory buffer for the config */
{
CfgBuf = Buf;
}
int CfgAvail (void)
/* Return true if we have a configuration available */
{
return CfgName != 0 || CfgBuf != 0;
}
void CfgOpenInput (void)
/* Open the input file if we have one */
{
/* If we have a config name given, open the file, otherwise we will read
* from a buffer.
*/
if (!CfgBuf) {
/* Open the file */
InputFile = fopen (CfgName, "r");
if (InputFile == 0) {
Error ("Cannot open `%s': %s", CfgName, strerror (errno));
}
}
/* Initialize variables */
C = ' ';
InputLine = 1;
InputCol = 0;
/* Start the ball rolling ... */
CfgNextTok ();
}
void CfgCloseInput (void)
/* Close the input file if we have one */
{
/* Close the input file if we had one */
if (InputFile) {
(void) fclose (InputFile);
InputFile = 0;
}
}
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