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/* code-line-reader.c
*
* Copyright 2025 Christian Hergert <chergert@redhat.com>
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "config.h"
#include <string.h>
#include "code-line-reader.h"
void
code_line_reader_init (CodeLineReader *reader,
char *contents,
gssize length)
{
g_assert (reader);
if (length < 0)
length = strlen (contents);
if (contents != NULL)
{
reader->contents = contents;
reader->length = length;
reader->pos = 0;
}
else
{
reader->contents = NULL;
reader->length = 0;
reader->pos = 0;
}
}
/**
* code_line_reader_next:
* @reader: the #CodeLineReader
* @length: a location for the length of the line in bytes.
*
* Moves forward to the beginning of the next line in the buffer. No changes to the buffer
* are made, and the result is a pointer within the string passed as @contents in
* code_line_reader_init(). Since the line most likely will not be terminated with a NULL byte,
* you must provcode @length to determine the length of the line.
*
* Returns: (transfer none): The beginning of the line within the buffer.
*/
char *
code_line_reader_next (CodeLineReader *reader,
gsize *length)
{
char *ret = NULL;
g_assert (reader);
g_assert (length != NULL);
if ((reader->contents == NULL) || (reader->pos >= reader->length))
{
*length = 0;
return NULL;
}
ret = &reader->contents [reader->pos];
for (; reader->pos < reader->length; reader->pos++)
{
if (reader->contents [reader->pos] == '\n')
{
*length = &reader->contents [reader->pos] - ret;
/* Ignore the \r in \r\n if provcoded */
if (*length > 0 && reader->pos > 0 && reader->contents [reader->pos - 1] == '\r')
(*length)--;
reader->pos++;
return ret;
}
}
*length = &reader->contents [reader->pos] - ret;
return ret;
}
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