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Changed supposed usage of the original line input stack. It is now used for reusing input lines.

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This commit is contained in:
acqn 2022-09-01 12:58:52 +08:00
parent 133507b031
commit 942ee47d05
2 changed files with 57 additions and 40 deletions
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94
src/cc65/input.c
View File

@ -67,6 +67,9 @@
/* The current input line */
StrBuf* Line;
/* The input line to reuse as the next line */
static StrBuf* CurReusedLine;
/* Current and next input character */
char CurC = '\0';
char NextC = '\0';
@ -403,24 +406,6 @@ static void GetInputChar (void)
/* NextC is '\0' by default */
NextC = '\0';
/* Drop all pushed fragments that don't have data left */
if (CurrentInputStack != 0) {
while (SB_GetIndex (Line) >= SB_GetLen (Line)) {
/* Cannot read more from this line, check next line on stack if any */
if (CollCount (CurrentInputStack) == 0) {
/* This is THE line */
break;
}
FreeStrBuf (Line);
Line = CollPop (CurrentInputStack);
}
/* NextC comes from next fragment */
if (CollCount (CurrentInputStack) > 0) {
NextC = ' ';
}
}
/* Get CurC from the line */
CurC = SB_LookAt (Line, SB_GetIndex (Line));
}
@ -461,13 +446,17 @@ void PushLine (StrBuf* L)
/* Save the current input line and use a new one */
{
PRECONDITION (CurrentInputStack != 0);
if (SB_GetIndex (L) < SB_GetLen (L)) {
CollAppend (CurrentInputStack, Line);
Line = L;
GetInputChar ();
} else {
FreeStrBuf (L);
}
CollAppend (CurrentInputStack, Line);
Line = L;
GetInputChar ();
}
void ReuseInputLine (void)
/* Save and reuse the current line as the next line */
{
CurReusedLine = Line;
}
@ -475,16 +464,6 @@ void PushLine (StrBuf* L)
void ClearLine (void)
/* Clear the current input line */
{
if (CurrentInputStack != 0) {
unsigned I;
/* Remove all pushed fragments from the input stack */
for (I = 0; I < CollCount (CurrentInputStack); ++I) {
FreeStrBuf (Line);
Line = CollPop (CurrentInputStack);
}
}
/* Clear the contents of Line */
SB_Clear (Line);
CurC = '\0';
@ -515,12 +494,47 @@ int NextLine (void)
int C;
AFile* Input;
/* Clear the current line */
ClearLine ();
SB_Clear (Line);
/* Overwrite the next input line with the pushed line if there is one */
if (CurReusedLine != 0) {
/* Use data move to resolve the issue that Line may be impersistent */
if (Line != CurReusedLine) {
SB_Move (Line, CurReusedLine);
}
/* Continue with this Line */
InitLine (Line);
CurReusedLine = 0;
/* Must have an input file when called */
if (CollCount(&AFiles) == 0) {
return 1;
}
/* If there are pushed input lines, read from them */
if (CurrentInputStack != 0 && CollCount (CurrentInputStack) > 0) {
/* Drop all pushed fragments that have no data left until one can be
** used as input.
*/
do {
/* Use data move to resolve the issue that Line may be impersistent */
if (Line != CollLast (CurrentInputStack)) {
SB_Move (Line, CollPop (CurrentInputStack));
} else {
CollPop (CurrentInputStack);
}
} while (CollCount (CurrentInputStack) > 0 &&
SB_GetIndex (Line) >= SB_GetLen (Line));
if (SB_GetIndex (Line) < SB_GetLen (Line)) {
InitLine (Line);
/* Successive */
return 1;
}
}
/* Otherwise, clear the current line */
ClearLine ();
/* Must have an input file when going on */
if (CollCount (&AFiles) == 0) {
return 0;
}

3
src/cc65/input.h
View File

@ -105,6 +105,9 @@ Collection* UseInputStack (Collection* InputStack);
void PushLine (StrBuf* L);
/* Save the current input line and use a new one */
void ReuseInputLine (void);
/* Save and reuse the current line as the next line */
void ClearLine (void);
/* Clear the current input line */