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First da65 version

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git-svn-id: svn://svn.cc65.org/cc65/trunk@332 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2000-09-24 15:55:57 +00:00
parent c05f6064a4
commit 5a90b5a58c
18 changed files with 3986 additions and 0 deletions
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src/da65/code.c Normal file
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/*****************************************************************************/
/* */
/* code.c */
/* */
/* Binary code management */
/* */
/* */
/* */
/* (C) 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 <stdio.h>
#include <string.h>
#include <errno.h>
/* common */
#include "check.h"
/* da65 */
#include "error.h"
#include "code.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
static unsigned char CodeBuf [0x10000]; /* Code buffer */
static unsigned long CodeStart; /* Start address */
static unsigned long CodeEnd; /* End address */
static unsigned long PC; /* Current PC */
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void LoadCode (const char* Name, unsigned long StartAddress)
/* Load the code from the given file */
{
unsigned Count, MaxCount;
FILE* F;
PRECONDITION (StartAddress < 0x10000);
/* Calculate the maximum code size */
MaxCount = 0x10000 - StartAddress;
/* Open the file */
F = fopen (Name, "rb");
if (F == 0) {
Error ("Cannot open `%s': %s", Name, strerror (errno));
}
/* Read from the file and remember the number of bytes read */
Count = fread (CodeBuf + StartAddress, 1, MaxCount, F);
if (ferror (F)) {
Error ("Error reading from `%s': %s", Name, strerror (errno));
}
if (Count == 0) {
Error ("File `%s' contains no data", Name);
}
/* Set the buffer variables */
CodeStart = PC = StartAddress;
CodeEnd = CodeStart + Count - 1; /* CodeEnd is inclusive */
}
unsigned GetPC (void)
/* Get the current program counter */
{
return PC;
}
unsigned char PeekCodeByte (void)
/* Peek at the byte at the current PC */
{
PRECONDITION (PC <= CodeEnd);
return CodeBuf [PC];
}
unsigned char GetCodeByte (void)
/* Get a byte from the PC and increment it */
{
PRECONDITION (PC <= CodeEnd);
return CodeBuf [PC++];
}
unsigned GetCodeWord (void)
/* Get a word from the current PC and increment it */
{
unsigned Lo = GetCodeByte ();
unsigned Hi = GetCodeByte ();
return Lo | (Hi << 8);
}
unsigned GetRemainingBytes (void)
/* Return the number of remaining code bytes */
{
if (CodeEnd >= PC) {
return (CodeEnd - PC + 1);
} else {
return 0;
}
}
void ResetCode (void)
/* Reset the code input to start over for the next pass */
{
PC = CodeStart;
}