From 0da97c67115a80ac14c2ae90a5cda18b81c224d7 Mon Sep 17 00:00:00 2001
From: cuz <cuz@b7a2c559-68d2-44c3-8de9-860c34a00d81>
Date: Wed, 8 Jun 2005 11:31:00 +0000
Subject: [PATCH] Fixed a bug: Compiling an empty source file led to an
 internal error. Changed the lineinfo module to take dynamically allocated
 string buffers instead of char*.

git-svn-id: svn://svn.cc65.org/cc65/trunk@3523 b7a2c559-68d2-44c3-8de9-860c34a00d81
---
 src/cc65/input.c    | 14 +++++++++++---
 src/cc65/lineinfo.c | 41 ++++++++++++++++++++++-------------------
 src/cc65/lineinfo.h |  9 +++++++--
 3 files changed, 40 insertions(+), 24 deletions(-)

diff --git a/src/cc65/input.c b/src/cc65/input.c
index 6a26869f2..d093f4103 100644
--- a/src/cc65/input.c
+++ b/src/cc65/input.c
@@ -205,6 +205,9 @@ static IFile* FindFile (const char* Name)
 void OpenMainFile (const char* Name)
 /* Open the main file. Will call Fatal() in case of failures. */
 {
+    AFile* MainFile;
+
+
     /* Setup a new IFile structure for the main file */
     IFile* IF = NewIFile (Name);
 
@@ -216,10 +219,15 @@ void OpenMainFile (const char* Name)
     }
 
     /* Allocate a new AFile structure for the file */
-    (void) NewAFile (IF, F);
+    MainFile = NewAFile (IF, F);
 
     /* Allocate the input line buffer */
     Line = NewStrBuf ();
+
+    /* Update the line infos, so we have a valid line info even at start of
+     * the main file before the first line is read.
+     */
+    UpdateLineInfo (MainFile->Input, MainFile->Line, Line);
 }
 
 
@@ -340,7 +348,7 @@ static void GetInputChar (void)
 
 void NextChar (void)
 /* Skip the current input character and read the next one from the input
- * stream. CurC and NextC are valid after the call. If end of line is 
+ * stream. CurC and NextC are valid after the call. If end of line is
  * reached, both are set to NUL, no more lines are read by this function.
  */
 {
@@ -478,7 +486,7 @@ int NextLine (void)
     InitLine (Line);
 
     /* Create line information for this line */
-    UpdateLineInfo (Input->Input, Input->Line, SB_GetConstBuf (Line));
+    UpdateLineInfo (Input->Input, Input->Line, Line);
 
     /* Done */
     return 1;
diff --git a/src/cc65/lineinfo.c b/src/cc65/lineinfo.c
index 342eeaced..cdb409551 100644
--- a/src/cc65/lineinfo.c
+++ b/src/cc65/lineinfo.c
@@ -64,22 +64,25 @@ static LineInfo* CurLineInfo = 0;
 
 
 
-static LineInfo* NewLineInfo (struct IFile* F, unsigned LineNum, const char* Line)
+static LineInfo* NewLineInfo (struct IFile* F, unsigned LineNum, const StrBuf* Line)
 /* Create and return a new line info. Ref count will be 1. */
 {
-    unsigned  Len;
-    LineInfo* LI;
-    char*     T;
+    unsigned    Len;
+    LineInfo*   LI;
+    const char* S;
+    char*       T;
+
+    /* Get the length of the line and a pointer to the line buffer */
+    Len = SB_GetLen (Line);
+    S   = SB_GetConstBuf (Line);
 
     /* Skip leading spaces in Line */
-    while (IsBlank (*Line)) {
-    	++Line;
+    while (Len > 0 && IsBlank (*S)) {
+       	++S;
+        --Len;
     }
 
-    /* Calculate the length of the line */
-    Len = strlen (Line);
-
-    /* Allocate memory */
+    /* Allocate memory for the line info and the input line */
     LI = xmalloc (sizeof (LineInfo) + Len);
 
     /* Initialize the fields */
@@ -93,13 +96,13 @@ static LineInfo* NewLineInfo (struct IFile* F, unsigned LineNum, const char* Lin
      */
     T = LI->Line;
     while (Len--) {
-       	if (*Line == '\t') {
-	    *T = ' ';
-	} else {
-	    *T = *Line;
-	}
-	++Line;
-	++T;
+       	if (*S == '\t') {
+       	    *T = ' ';
+       	} else {
+       	    *T = *S;
+       	}
+       	++S;
+       	++T;
     }
 
     /* Add the terminator */
@@ -153,7 +156,7 @@ LineInfo* GetCurLineInfo (void)
 
 
 
-void UpdateLineInfo (struct IFile* F, unsigned LineNum, const char* Line)
+void UpdateLineInfo (struct IFile* F, unsigned LineNum, const StrBuf* Line)
 /* Update the line info - called if a new line is read */
 {
     /* If a current line info exists, release it */
@@ -165,7 +168,7 @@ void UpdateLineInfo (struct IFile* F, unsigned LineNum, const char* Line)
      * of the supplied one to save some memory.
      */
     if (!AddSource) {
-	Line = "";
+	Line = &EmptyStrBuf;
     }
 
     /* Create a new line info */
diff --git a/src/cc65/lineinfo.h b/src/cc65/lineinfo.h
index 3a19ca0ae..6d0f2d05c 100644
--- a/src/cc65/lineinfo.h
+++ b/src/cc65/lineinfo.h
@@ -37,6 +37,11 @@
 #define LINEINFO_H
 
 
+                   
+/* common */
+#include "strbuf.h"
+
+
 
 /*****************************************************************************/
 /*				   Forwards                                  */
@@ -45,7 +50,7 @@
 
 
 /* Input file structure */
-struct IFile;
+struct IFile;           
 
 
 
@@ -87,7 +92,7 @@ LineInfo* GetCurLineInfo (void);
  * increased, use UseLineInfo for that purpose.
  */
 
-void UpdateLineInfo (struct IFile* F, unsigned LineNum, const char* Line);
+void UpdateLineInfo (struct IFile* F, unsigned LineNum, const StrBuf* Line);
 /* Update the line info - called if a new line is read */
 
 const char* GetInputName (const LineInfo* LI);