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134 lines
4.2 KiB
C
134 lines
4.2 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Boris Zbarsky
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* <bzbarsky@mit.edu> Portions created by Boris Zbarsky are Copyright
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* (C) 2001. All Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef nsReadLine_h__
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#define nsReadLine_h__
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#include "prmem.h"
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#include "nsIInputStream.h"
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/* To properly use the helper function in here (ReadLine) the caller
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* needs to declare a pointer to an nsLineBuffer, call
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* NS_InitLineBuffer on it, and pass it to ReadLine every time it
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* wants a line out.
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*
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* When done, the pointer should be freed using PR_FREEIF.
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*/
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#define kLineBufferSize 1024
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typedef struct {
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char buf[kLineBufferSize+1];
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char* start;
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char* current;
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char* end;
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PRBool empty;
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} nsLineBuffer;
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static nsresult
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NS_InitLineBuffer (nsLineBuffer ** aBufferPtr) {
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*aBufferPtr = PR_NEW(nsLineBuffer);
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if (!(*aBufferPtr)) return NS_ERROR_OUT_OF_MEMORY;
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(*aBufferPtr)->start = (*aBufferPtr)->current = (*aBufferPtr)->end = (*aBufferPtr)->buf;
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(*aBufferPtr)->empty = PR_TRUE;
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return NS_OK;
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}
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static nsresult
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NS_ReadLine (nsIInputStream* aStream, nsLineBuffer * aBuffer,
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nsAString & aLine, PRBool *more) {
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nsresult rv = NS_OK;
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PRUint32 bytesRead;
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nsAutoString temp;
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*more = PR_TRUE;
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PRBool eolStarted = PR_FALSE;
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char eolchar = '\0';
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aLine.Truncate();
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while (1) { // will be returning out of this loop on eol or eof
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if (aBuffer->empty) { // buffer is empty. Read into it.
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rv = aStream->Read(aBuffer->buf, kLineBufferSize, &bytesRead);
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if (NS_FAILED(rv)) // read failed
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return rv;
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if (bytesRead == 0) { // end of file
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*more = PR_FALSE;
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return NS_OK;
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}
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aBuffer->end = aBuffer->buf + bytesRead;
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aBuffer->empty = PR_FALSE;
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*(aBuffer->end) = '\0'; // null-terminate this thing
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}
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// walk the buffer looking for an end-of-line
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while (aBuffer->current < aBuffer->end) {
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if (eolStarted) {
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if ((eolchar == '\n' && *(aBuffer->current) == '\r') ||
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(eolchar == '\r' && *(aBuffer->current) == '\n')) { // line end
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(aBuffer->current)++;
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aBuffer->start = aBuffer->current;
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}
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eolStarted = PR_FALSE;
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return NS_OK;
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} else if (*(aBuffer->current) == '\n' ||
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*(aBuffer->current) == '\r') { // line end
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eolStarted = PR_TRUE;
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eolchar = *(aBuffer->current);
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*(aBuffer->current) = '\0';
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temp.AssignWithConversion(aBuffer->start);
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aLine.Append(temp);
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(aBuffer->current)++;
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aBuffer->start = aBuffer->current;
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} else {
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eolStarted = PR_FALSE;
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(aBuffer->current)++;
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}
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}
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// append whatever we currently have to the string
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temp.AssignWithConversion(aBuffer->start);
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aLine.Append(temp);
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// we've run out of buffer. Begin anew
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aBuffer->current = aBuffer->start = aBuffer->buf;
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aBuffer->empty = PR_TRUE;
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if (eolStarted) { // have to read another char and possibly skip over it
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rv = aStream->Read(aBuffer->buf, 1, &bytesRead);
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if (NS_FAILED(rv)) // read failed
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return rv;
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if (bytesRead == 0) { // end of file
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*more = PR_FALSE;
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return NS_OK;
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}
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if ((eolchar == '\n' && *(aBuffer->buf) == '\r') ||
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(eolchar == '\r' && *(aBuffer->buf) == '\n')) {
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// Just return and all is good -- we've skipped the extra newline char
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return NS_OK;
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} else {
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// we have a byte that we should look at later
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aBuffer->empty = PR_FALSE;
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aBuffer->end = aBuffer->buf + 1;
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*(aBuffer->end) = '\0';
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}
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}
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}
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}
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#endif // nsReadLine_h__
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