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/* Word-wrapping and line-truncating streams.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#ifndef __LINEWRAP_H__
#define __LINEWRAP_H__
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <features.h>
#include <string.h> /* Need size_t. */
__BEGIN_DECLS
/* We keep this data for each line-wrapping stream. */
struct line_wrap_data
{
size_t lmargin, rmargin; /* Left and right margins. */
size_t wmargin; /* Margin to wrap to, or -1 to truncate. */
size_t point; /* Current column of last chars flushed. */
/* Original cookie and hooks from the stream. */
void *cookie;
void (*output) (FILE *, int);
__io_close_fn *close;
__io_fileno_fn *fileno;
__io_seek_fn *seek;
};
/* Modify STREAM so that it prefixes lines written on it with LMARGIN spaces
and limits them to RMARGIN columns total. If WMARGIN >= 0, words that
extend past RMARGIN are wrapped by replacing the whitespace before them
with a newline and WMARGIN spaces. Otherwise, chars beyond RMARGIN are
simply dropped until a newline. Returns STREAM after modifying it, or
NULL if there was an error. */
FILE *line_wrap_stream (FILE *stream,
size_t lmargin, size_t rmargin, size_t wmargin);
/* Remove the hooks placed in STREAM by `line_wrap_stream'. */
void line_unwrap_stream (FILE *stream);
/* Returns true if STREAM is line wrapped. */
extern inline int line_wrapped (FILE *stream);
/* If STREAM is not line-wrapped return -1, else return its left margin. */
extern size_t line_wrap_lmargin (FILE *stream);
/* If STREAM is not line-wrapped return -1, else set its left margin to
LMARGIN and return the old value. */
extern size_t line_wrap_set_lmargin (FILE *stream, size_t lmargin);
/* If STREAM is not line-wrapped return -1, else return its left margin. */
extern size_t line_wrap_rmargin (FILE *stream);
/* If STREAM is not line-wrapped return -1, else set its right margin to
RMARGIN and return the old value. */
extern size_t line_wrap_set_rmargin (FILE *stream, size_t rmargin);
/* If STREAM is not line-wrapped return -1, else return its wrap margin. */
extern size_t line_wrap_wmargin (FILE *stream);
/* If STREAM is not line-wrapped return -1, else set its left margin to
WMARGIN and return the old value. */
extern size_t line_wrap_set_wmargin (FILE *stream, size_t wmargin);
/* If STREAM is not line-wrapped return -1, else return the column number of
the current output point. */
extern size_t line_wrap_point (FILE *stream);
#ifdef __OPTIMIZE__
extern void __line_wrap_output (FILE *, int); /* private */
/* Returns true if STREAM is line wrapped. */
extern inline int
line_wrapped (FILE *stream)
{
return (stream->__room_funcs.__output == &__line_wrap_output);
}
/* If STREAM is not line-wrapped return -1, else return its left margin. */
extern inline size_t
line_wrap_lmargin (FILE *stream)
{
if (! line_wrapped (stream))
return -1;
return ((struct line_wrap_data *)stream->__cookie)->lmargin;
}
/* If STREAM is not line-wrapped return -1, else set its left margin to
LMARGIN and return the old value. */
extern inline size_t
line_wrap_set_lmargin (FILE *stream, size_t lmargin)
{
if (! line_wrapped (stream))
return -1;
else
{
struct line_wrap_data *d = stream->__cookie;
size_t old = d->lmargin;
d->lmargin = lmargin;
return old;
}
}
/* If STREAM is not line-wrapped return -1, else return its left margin. */
extern inline size_t
line_wrap_rmargin (FILE *stream)
{
if (! line_wrapped (stream))
return -1;
return ((struct line_wrap_data *)stream->__cookie)->rmargin;
}
/* If STREAM is not line-wrapped return -1, else set its right margin to
RMARGIN and return the old value. */
extern inline size_t
line_wrap_set_rmargin (FILE *stream, size_t rmargin)
{
if (! line_wrapped (stream))
return -1;
else
{
struct line_wrap_data *d = stream->__cookie;
size_t old = d->rmargin;
d->rmargin = rmargin;
return old;
}
}
/* If STREAM is not line-wrapped return -1, else return its wrap margin. */
extern inline size_t
line_wrap_wmargin (FILE *stream)
{
if (! line_wrapped (stream))
return -1;
return ((struct line_wrap_data *)stream->__cookie)->wmargin;
}
/* If STREAM is not line-wrapped return -1, else set its left margin to
WMARGIN and return the old value. */
extern inline size_t
line_wrap_set_wmargin (FILE *stream, size_t wmargin)
{
if (! line_wrapped (stream))
return -1;
else
{
struct line_wrap_data *d = stream->__cookie;
size_t old = d->wmargin;
d->wmargin = wmargin;
return old;
}
}
/* If STREAM is not line-wrapped return -1, else return the column number of
the current output point. */
extern inline size_t
line_wrap_point (FILE *stream)
{
if (! line_wrapped (stream))
return -1;
return ((struct line_wrap_data *)stream->__cookie)->point;
}
#endif /* Optimizing. */
__END_DECLS
#endif /* __LINEWRAP_H__ */
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