97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/* A string or file based input stream.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2024. */
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#include <config.h>
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/* Specification. */
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#include "sf-istream.h"
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#include <stdlib.h>
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#include <string.h>
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void
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sf_istream_init_from_file (sf_istream_t *stream, FILE *fp)
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{
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stream->fp = fp;
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stream->input = NULL;
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stream->input_end = NULL;
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}
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void
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sf_istream_init_from_string (sf_istream_t *stream,
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const char *input)
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{
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stream->fp = NULL;
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stream->input = input;
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stream->input_end = input + strlen (input);
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}
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void
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sf_istream_init_from_string_desc (sf_istream_t *stream,
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string_desc_t input)
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{
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stream->fp = NULL;
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stream->input = string_desc_data (input);
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stream->input_end = stream->input + string_desc_length (input);
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}
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int
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sf_getc (sf_istream_t *stream)
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{
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int c;
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if (stream->fp != NULL)
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c = getc (stream->fp);
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else
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{
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if (stream->input == stream->input_end)
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return EOF;
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c = (unsigned char) *(stream->input++);
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}
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return c;
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}
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int
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sf_ferror (sf_istream_t *stream)
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{
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return (stream->fp != NULL && ferror (stream->fp));
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}
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void
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sf_ungetc (sf_istream_t *stream, int c)
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{
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if (c != EOF)
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{
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if (stream->fp != NULL)
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ungetc (c, stream->fp);
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else
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{
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stream->input--;
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if (!(c == (unsigned char) *stream->input))
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/* C was incorrect. */
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abort ();
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}
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}
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}
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void
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sf_free (sf_istream_t *stream)
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{
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}
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