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New default for start address

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2366 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2003-08-18 20:36:38 +00:00
parent da8739609d
commit 7faa7ab3b8
5 changed files with 41 additions and 28 deletions
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53
src/da65/code.c
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@@ -6,10 +6,10 @@
/* */
/* */
/* */
/* (C) 2000 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* (C) 2000-2003 Ullrich von Bassewitz */
/* R<EFBFBD>merstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
@@ -41,8 +41,9 @@
#include "check.h"
/* da65 */
#include "error.h"
#include "code.h"
#include "error.h"
#include "global.h"
@@ -65,53 +66,65 @@ unsigned long PC; /* Current PC */
void LoadCode (const char* Name, unsigned long StartAddress)
void LoadCode (void)
/* Load the code from the given file */
{
long Count, MaxCount, Size;
FILE* F;
PRECONDITION (StartAddress < 0x10000);
/* Calculate the maximum code size */
MaxCount = 0x10000 - StartAddress;
PRECONDITION (StartAddr < 0x10000);
/* Open the file */
F = fopen (Name, "rb");
F = fopen (InFile, "rb");
if (F == 0) {
Error ("Cannot open `%s': %s", Name, strerror (errno));
Error ("Cannot open `%s': %s", InFile, strerror (errno));
}
/* Seek to the end to get the size of the file */
if (fseek (F, 0, SEEK_END) != 0) {
Error ("Cannot seek on file `%s': %s", Name, strerror (errno));
Error ("Cannot seek on file `%s': %s", InFile, strerror (errno));
}
Size = ftell (F);
rewind (F);
/* If the start address was not given, set it so that the code loads to
* 0x10000 - Size. This is a reasonable default assuming that the file
* is a ROM that contains the hardware vectors at $FFFA.
*/
if (StartAddr < 0) {
if (Size > 0x10000) {
StartAddr = 0;
} else {
StartAddr = 0x10000 - Size;
}
}
/* Calculate the maximum code size */
MaxCount = 0x10000 - StartAddr;
/* Check if the size is larger than what we can read */
if (Size == 0) {
Error ("File `%s' contains no data", Name);
Error ("File `%s' contains no data", InFile);
}
if (Size > MaxCount) {
Warning ("File `%s' is too large, ignoring %ld bytes",
Name, Size - MaxCount);
Warning ("File `%s' is too large, ignoring %ld bytes",
InFile, Size - MaxCount);
} else if (MaxCount > Size) {
MaxCount = (unsigned) Size;
MaxCount = (unsigned) Size;
}
/* Read from the file and remember the number of bytes read */
Count = fread (CodeBuf + StartAddress, 1, MaxCount, F);
Count = fread (CodeBuf + StartAddr, 1, MaxCount, F);
if (ferror (F) || Count != MaxCount) {
Error ("Error reading from `%s': %s", Name, strerror (errno));
Error ("Error reading from `%s': %s", InFile, strerror (errno));
}
/* Close the file */
fclose (F);
/* Set the buffer variables */
CodeStart = PC = StartAddress;
CodeStart = PC = StartAddr;
CodeEnd = CodeStart + Count - 1; /* CodeEnd is inclusive */
}