Added INPUTOFFS and INPUTSIZE

git-svn-id: svn://svn.cc65.org/cc65/trunk@2411 b7a2c559-68d2-44c3-8de9-860c34a00d81

doc/da65.sgml

@@ -261,6 +261,20 @@ following attributes are recognized:
   input file name on the command line.
 
 
+  <tag><tt>INPUTOFFS</tt></tag>
+
+  The attribute is followed by a numerical value that gives an offset into
+  the input file which is skipped before reading data. The attribute may be
+  used to skip headers or unwanted code sections in the input file.
+
+
+  <tag><tt>INPUTSIZE</tt></tag>
+
+  INPUTSIZE is followed by a numerical value that gives the amount of data
+  to read from the input file. Data beyond <tt/INPUTOFFS+INPUTSIZE/ is 
+  ignored.
+
+
   <tag><tt>OUTPUTNAME</tt></tag>
 
   The attribute is followed by string value, which gives the name of the

src/da65/code.c

@@ -86,18 +86,43 @@ void LoadCode (void)
 	Error ("Cannot seek on file `%s': %s", InFile, strerror (errno));
     }
     Size = ftell (F);
-    rewind (F);
+
+    /* The input offset must be smaller than the size */
+    if (InputOffs >= 0) {
+        if (InputOffs >= Size) {
+            Error ("Input offset is greater than file size");
+        }
+    } else {
+        /* Use a zero offset */
+        InputOffs = 0;
+    }
+
+    /* Seek to the input offset and correct size to contain the remainder of
+     * the file.
+     */
+    if (fseek (F, InputOffs, SEEK_SET) != 0) {
+	Error ("Cannot seek on file `%s': %s", InFile, strerror (errno));
+    }
+    Size -= InputOffs;
+
+    /* Limit the size to the maximum input size if one is given */
+    if (InputSize >= 0) {
+        if (InputSize > Size) {
+            Error ("Input size is greater than what is available");
+        }
+        Size = InputSize;
+    }
 
     /* 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) {
+     	if (Size > 0x10000) {
-	    StartAddr = 0;
+     	    StartAddr = 0;
-	} else {
+     	} else {
-	    StartAddr = 0x10000 - Size;
+     	    StartAddr = 0x10000 - Size;
-	}
+     	}
     }
 
     /* Calculate the maximum code size */
@@ -105,7 +130,7 @@ void LoadCode (void)
 
     /* Check if the size is larger than what we can read */
     if (Size == 0) {
-       	Error ("File `%s' contains no data", InFile);
+       	Error ("Nothing to read from input file `%s'", InFile);
     }
     if (Size > MaxCount) {
        	Warning ("File `%s' is too large, ignoring %ld bytes",

src/da65/global.c

@@ -53,15 +53,17 @@ const char CfgExt[]    	      = ".cfg";	/* Config file extension */
 
 /* Flags and other command line stuff */
 unsigned char DebugInfo       = 0;      /* Add debug info to the object file */
-unsigned char FormFeeds	      = 0;	/* Add form feeds to the output? */
+unsigned char FormFeeds	      = 0;  	/* Add form feeds to the output? */
-unsigned char PassCount	      = 2;	/* How many passed do we do? */
+unsigned char PassCount	      = 2;  	/* How many passed do we do? */
-long 	      StartAddr	      = -1;	/* Start/load address of the program */
+long 	      StartAddr	      = -1L; 	/* Start/load address of the program */
+long          InputOffs       = -1L;    /* Offset into input file */
+long          InputSize       = -1L;    /* Number of bytes to read from input */
 
 /* Stuff needed by many routines */
-unsigned char Pass	      = 0;	/* Disassembler pass */
+unsigned      Pass	      = 0;	/* Disassembler pass */
 
 /* Comments */
-unsigned char Comments        = 0;      /* Add which comments to the output? */
+unsigned      Comments        = 0;      /* Add which comments to the output? */
 
 /* Page formatting */
 unsigned PageLength    	      = 0;	/* Length of a listing page */

src/da65/global.h

@@ -44,7 +44,7 @@
 
 
 
-/* File names */
+/* File stuff */
 extern const char*	InFile;		/* Name of input file */
 extern const char*	OutFile;	/* Name of output file */
 
@@ -57,15 +57,16 @@ extern unsigned char    DebugInfo;      /* Add debug info to the object file */
 extern unsigned char	FormFeeds;	/* Add form feeds to the output? */
 extern unsigned char	PassCount;	/* How many passed do we do? */
 extern long    		StartAddr;	/* Start/load address of the program */
-
+extern long             InputOffs;      /* Offset into input file */
+extern long             InputSize;      /* Number of bytes to read from input */
 
 /* Stuff needed by many routines */
-extern unsigned char	Pass;		/* Disassembler pass */
+extern unsigned         Pass;	     	/* Disassembler pass */
 
 /* Comments */
 #define MIN_COMMENTS    0
 #define MAX_COMMENTS    4
-extern unsigned char    Comments;       /* Add which comments to the output? */
+extern unsigned         Comments;       /* Add which comments to the output? */
 
 /* Page formatting */
 #define MIN_PAGE_LEN	32

src/da65/infofile.c

@@ -70,6 +70,8 @@ static void GlobalSection (void)
         {   "COMMENTS",         INFOTOK_COMMENTS        },
        	{   "CPU",     	        INFOTOK_CPU     	},
        	{   "INPUTNAME",  	INFOTOK_INPUTNAME	},
+        {   "INPUTOFFS",        INFOTOK_INPUTOFFS       },
+        {   "INPUTSIZE",        INFOTOK_INPUTSIZE       },
 	{   "OUTPUTNAME",      	INFOTOK_OUTPUTNAME	},
 	{   "PAGELENGTH",      	INFOTOK_PAGELENGTH	},
 	{   "STARTADDR",	INFOTOK_STARTADDR	},
@@ -119,6 +121,21 @@ static void GlobalSection (void)
 		InfoNextTok ();
 		break;
 
+            case INFOTOK_INPUTOFFS:
+		InfoNextTok ();
+		InfoAssureInt ();
+		InputOffs = InfoIVal;
+		InfoNextTok ();
+		break;
+
+            case INFOTOK_INPUTSIZE:
+		InfoNextTok ();
+		InfoAssureInt ();
+                InfoRangeCheck (1, 0x10000);
+		InputSize = InfoIVal;
+		InfoNextTok ();
+		break;
+
 	    case INFOTOK_OUTPUTNAME:
 		InfoNextTok ();
 		InfoAssureStr ();

src/da65/main.c

@@ -247,7 +247,7 @@ static void OneOpcode (unsigned RemainingBytes)
      *   - ...if we have enough bytes remaining for the code at this address.
      *   - ...if the current instruction is valid for the given CPU.
      *   - ...if there is no label somewhere between the instruction bytes.
-     * If any of these conditions is true, switch to data mode.
+     * If any of these conditions is false, switch to data mode.
      */
     if (GetStyleAttr (PC) == atDefault) {
 	if (D->Size > RemainingBytes) {

src/da65/scanner.h

@@ -68,6 +68,8 @@ typedef enum token_t {
     INFOTOK_COMMENTS,
     INFOTOK_CPU,
     INFOTOK_INPUTNAME,
+    INFOTOK_INPUTOFFS,
+    INFOTOK_INPUTSIZE,
     INFOTOK_OUTPUTNAME,
     INFOTOK_PAGELENGTH,
     INFOTOK_STARTADDR,