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/* A string or file based input stream.
Copyright (C) 2024 Free Software Foundation, Inc.
This file 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 3 of the
License, or (at your option) any later version.
This file 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 Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
#include <config.h>
/* Specification. */
#include "sf-istream.h"
#include <stdlib.h>
#include <string.h>
void
sf_istream_init_from_file (sf_istream_t *stream, FILE *fp)
{
stream->fp = fp;
stream->input = NULL;
stream->input_end = NULL;
}
void
sf_istream_init_from_string (sf_istream_t *stream,
const char *input)
{
stream->fp = NULL;
stream->input = input;
stream->input_end = input + strlen (input);
}
void
sf_istream_init_from_string_desc (sf_istream_t *stream,
string_desc_t input)
{
stream->fp = NULL;
stream->input = string_desc_data (input);
stream->input_end = stream->input + string_desc_length (input);
}
int
sf_getc (sf_istream_t *stream)
{
int c;
if (stream->fp != NULL)
c = getc (stream->fp);
else
{
if (stream->input == stream->input_end)
return EOF;
c = (unsigned char) *(stream->input++);
}
return c;
}
int
sf_ferror (sf_istream_t *stream)
{
return (stream->fp != NULL && ferror (stream->fp));
}
void
sf_ungetc (sf_istream_t *stream, int c)
{
if (c != EOF)
{
if (stream->fp != NULL)
ungetc (c, stream->fp);
else
{
stream->input--;
if (!(c == (unsigned char) *stream->input))
/* C was incorrect. */
abort ();
}
}
}
void
sf_free (sf_istream_t *stream)
{
}
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