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/* line-reader-private.h
*
* Copyright 2015-2023 Christian Hergert <christian@hergert.me>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 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: GPL-3.0-or-later
*/
#pragma once
#include <glib.h>
#include <string.h>
G_BEGIN_DECLS
typedef struct _LineReader
{
char *contents;
gsize length;
gssize pos;
} LineReader;
static inline void
line_reader_init (LineReader *reader,
char *contents,
gssize length)
{
g_assert (reader != NULL);
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;
}
}
static inline char *
line_reader_next (LineReader *reader,
gsize *length)
{
char *ret = NULL;
g_assert (reader != NULL);
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;
/* Ingore the \r in \r\n if provided */
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;
}
G_END_DECLS
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