mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 15:05:14 +00:00
348 lines
8.1 KiB
C
348 lines
8.1 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* fileio.c */
|
|
/* */
|
|
/* File I/O for the ld65 linker */
|
|
/* */
|
|
/* */
|
|
/* */
|
|
/* (C) 1998-2003 Ullrich von Bassewitz */
|
|
/* Römerstrasse 52 */
|
|
/* D-70794 Filderstadt */
|
|
/* EMail: uz@cc65.org */
|
|
/* */
|
|
/* */
|
|
/* 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 <string.h>
|
|
#include <errno.h>
|
|
|
|
/* common */
|
|
#include "xmalloc.h"
|
|
|
|
/* ld65 */
|
|
#include "error.h"
|
|
#include "fileio.h"
|
|
#include "spool.h"
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
/* Code */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
void FileSetPos (FILE* F, unsigned long Pos)
|
|
/* Seek to the given absolute position, fail on errors */
|
|
{
|
|
if (fseek (F, Pos, SEEK_SET) != 0) {
|
|
Error ("Cannot seek: %s", strerror (errno));
|
|
}
|
|
}
|
|
|
|
|
|
|
|
unsigned long FileGetPos (FILE* F)
|
|
/* Return the current file position, fail on errors */
|
|
{
|
|
long Pos = ftell (F);
|
|
if (Pos < 0) {
|
|
Error ("Error in ftell: %s", strerror (errno));
|
|
}
|
|
return Pos;
|
|
}
|
|
|
|
|
|
|
|
void Write8 (FILE* F, unsigned Val)
|
|
/* Write an 8 bit value to the file */
|
|
{
|
|
if (putc (Val, F) == EOF) {
|
|
Error ("Write error (disk full?)");
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void Write16 (FILE* F, unsigned Val)
|
|
/* Write a 16 bit value to the file */
|
|
{
|
|
Write8 (F, (unsigned char) Val);
|
|
Write8 (F, (unsigned char) (Val >> 8));
|
|
}
|
|
|
|
|
|
|
|
void Write24 (FILE* F, unsigned long Val)
|
|
/* Write a 24 bit value to the file */
|
|
{
|
|
Write8 (F, (unsigned char) Val);
|
|
Write8 (F, (unsigned char) (Val >> 8));
|
|
Write8 (F, (unsigned char) (Val >> 16));
|
|
}
|
|
|
|
|
|
|
|
void Write32 (FILE* F, unsigned long Val)
|
|
/* Write a 32 bit value to the file */
|
|
{
|
|
Write8 (F, (unsigned char) Val);
|
|
Write8 (F, (unsigned char) (Val >> 8));
|
|
Write8 (F, (unsigned char) (Val >> 16));
|
|
Write8 (F, (unsigned char) (Val >> 24));
|
|
}
|
|
|
|
|
|
|
|
void WriteVal (FILE* F, unsigned long Val, unsigned Size)
|
|
/* Write a value of the given size to the output file */
|
|
{
|
|
switch (Size) {
|
|
|
|
case 1:
|
|
Write8 (F, Val);
|
|
break;
|
|
|
|
case 2:
|
|
Write16 (F, Val);
|
|
break;
|
|
|
|
case 3:
|
|
Write24 (F, Val);
|
|
break;
|
|
|
|
case 4:
|
|
Write32 (F, Val);
|
|
break;
|
|
|
|
default:
|
|
Internal ("WriteVal: Invalid size: %u", Size);
|
|
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void WriteVar (FILE* F, unsigned long V)
|
|
/* Write a variable sized value to the file in special encoding */
|
|
{
|
|
/* We will write the value to the file in 7 bit chunks. If the 8th bit
|
|
* is clear, we're done, if it is set, another chunk follows. This will
|
|
* allow us to encode smaller values with less bytes, at the expense of
|
|
* needing 5 bytes if a 32 bit value is written to file.
|
|
*/
|
|
do {
|
|
unsigned char C = (V & 0x7F);
|
|
V >>= 7;
|
|
if (V) {
|
|
C |= 0x80;
|
|
}
|
|
Write8 (F, C);
|
|
} while (V != 0);
|
|
}
|
|
|
|
|
|
|
|
void WriteStr (FILE* F, const char* S)
|
|
/* Write a string to the file */
|
|
{
|
|
unsigned Len = strlen (S);
|
|
WriteVar (F, Len);
|
|
WriteData (F, S, Len);
|
|
}
|
|
|
|
|
|
|
|
void WriteData (FILE* F, const void* Data, unsigned Size)
|
|
/* Write data to the file */
|
|
{
|
|
if (fwrite (Data, 1, Size, F) != Size) {
|
|
Error ("Write error (disk full?)");
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void WriteMult (FILE* F, unsigned char Val, unsigned long Count)
|
|
/* Write one byte several times to the file */
|
|
{
|
|
while (Count--) {
|
|
Write8 (F, Val);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
unsigned Read8 (FILE* F)
|
|
/* Read an 8 bit value from the file */
|
|
{
|
|
int C = getc (F);
|
|
if (C == EOF) {
|
|
Error ("Read error (file corrupt?)");
|
|
}
|
|
return C;
|
|
}
|
|
|
|
|
|
|
|
unsigned Read16 (FILE* F)
|
|
/* Read a 16 bit value from the file */
|
|
{
|
|
unsigned Lo = Read8 (F);
|
|
unsigned Hi = Read8 (F);
|
|
return (Hi << 8) | Lo;
|
|
}
|
|
|
|
|
|
|
|
unsigned long Read24 (FILE* F)
|
|
/* Read a 24 bit value from the file */
|
|
{
|
|
unsigned long Lo = Read16 (F);
|
|
unsigned long Hi = Read8 (F);
|
|
return (Hi << 16) | Lo;
|
|
}
|
|
|
|
|
|
|
|
unsigned long Read32 (FILE* F)
|
|
/* Read a 32 bit value from the file */
|
|
{
|
|
unsigned long Lo = Read16 (F);
|
|
unsigned long Hi = Read16 (F);
|
|
return (Hi << 16) | Lo;
|
|
}
|
|
|
|
|
|
|
|
long Read32Signed (FILE* F)
|
|
/* Read a 32 bit value from the file. Sign extend the value. */
|
|
{
|
|
/* Read a 32 bit value */
|
|
unsigned long V = Read32 (F);
|
|
|
|
/* Sign extend the value */
|
|
if (V & 0x80000000UL) {
|
|
/* Signed value */
|
|
V |= ~0xFFFFFFFFUL;
|
|
}
|
|
|
|
/* Return it as a long */
|
|
return (long) V;
|
|
}
|
|
|
|
|
|
|
|
unsigned long ReadVar (FILE* F)
|
|
/* Read a variable size value from the file */
|
|
{
|
|
/* The value was written to the file in 7 bit chunks LSB first. If there
|
|
* are more bytes, bit 8 is set, otherwise it is clear.
|
|
*/
|
|
unsigned char C;
|
|
unsigned long V = 0;
|
|
unsigned Shift = 0;
|
|
do {
|
|
/* Read one byte */
|
|
C = Read8 (F);
|
|
/* Encode it into the target value */
|
|
V |= ((unsigned long)(C & 0x7F)) << Shift;
|
|
/* Next value */
|
|
Shift += 7;
|
|
} while (C & 0x80);
|
|
|
|
/* Return the value read */
|
|
return V;
|
|
}
|
|
|
|
|
|
|
|
unsigned ReadStr (FILE* F)
|
|
/* Read a string from the file, place it into the global string pool, and
|
|
* return its string id.
|
|
*/
|
|
{
|
|
unsigned Id;
|
|
char* B;
|
|
char Buf[256];
|
|
|
|
/* Read the length */
|
|
unsigned Len = ReadVar (F);
|
|
|
|
/* If the string is short enough, use our buffer on the stack, otherwise
|
|
* allocate space on the heap.
|
|
*/
|
|
if (Len < sizeof (Buf)) {
|
|
B = Buf;
|
|
} else {
|
|
B = xmalloc (Len + 1);
|
|
}
|
|
|
|
/* Read the string */
|
|
ReadData (F, B, Len);
|
|
|
|
/* Terminate the string */
|
|
B[Len] = '\0';
|
|
|
|
/* Insert it into the string pool and remember the id */
|
|
Id = GetStringId (B);
|
|
|
|
/* If we had allocated memory before, free it now */
|
|
if (B != Buf) {
|
|
xfree (B);
|
|
}
|
|
|
|
/* Return the string id */
|
|
return Id;
|
|
}
|
|
|
|
|
|
|
|
FilePos* ReadFilePos (FILE* F, FilePos* Pos)
|
|
/* Read a file position from the file */
|
|
{
|
|
/* Read the data fields */
|
|
Pos->Line = ReadVar (F);
|
|
Pos->Col = ReadVar (F);
|
|
Pos->Name = ReadVar (F);
|
|
return Pos;
|
|
}
|
|
|
|
|
|
|
|
void* ReadData (FILE* F, void* Data, unsigned Size)
|
|
/* Read data from the file */
|
|
{
|
|
/* Explicitly allow reading zero bytes */
|
|
if (Size > 0) {
|
|
if (fread (Data, 1, Size, F) != Size) {
|
|
Error ("Read error (file corrupt?)");
|
|
}
|
|
}
|
|
return Data;
|
|
}
|
|
|
|
|
|
|
|
|