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/* Word-wrapping and line-truncating streams.

   Copyright (C) 1997 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Written by Miles Bader <miles@gnu.ai.mit.edu>.

   The GNU C 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.

   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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

/* This package emulates glibc `line_wrap_stream' semantics for systems that

   don't have that.  If the system does have it, it is just a wrapper for

   that.  This header file is only used internally while compiling argp, and

   shouldn't be installed.  */

#ifndef _ARGP_FMTSTREAM_H

#define _ARGP_FMTSTREAM_H

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <string.h>

#include <unistd.h>

#if    (_LIBC - 0 && !defined (USE_IN_LIBIO)) \

    || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))

/* line_wrap_stream is available, so use that.  */

#define ARGP_FMTSTREAM_USE_LINEWRAP

#endif

#ifdef ARGP_FMTSTREAM_USE_LINEWRAP

/* Just be a simple wrapper for line_wrap_stream; the semantics are

   *slightly* different, as line_wrap_stream doesn't actually make a new

   object, it just modifies the given stream (reversibly) to do

   line-wrapping.  Since we control who uses this code, it doesn't matter.  */

#include <linewrap.h>

typedef FILE *argp_fmtstream_t;

#define argp_make_fmtstream line_wrap_stream

#define __argp_make_fmtstream line_wrap_stream

#define argp_fmtstream_free line_unwrap_stream

#define __argp_fmtstream_free line_unwrap_stream

#define __argp_fmtstream_putc(fs,ch) putc(ch,fs)

#define argp_fmtstream_putc(fs,ch) putc(ch,fs)

#define __argp_fmtstream_puts(fs,str) fputs(str,fs)

#define argp_fmtstream_puts(fs,str) fputs(str,fs)

#define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)

#define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)

#define __argp_fmtstream_printf fprintf

#define argp_fmtstream_printf fprintf

#define __argp_fmtstream_lmargin line_wrap_lmargin

#define argp_fmtstream_lmargin line_wrap_lmargin

#define __argp_fmtstream_set_lmargin line_wrap_set_lmargin

#define argp_fmtstream_set_lmargin line_wrap_set_lmargin

#define __argp_fmtstream_rmargin line_wrap_rmargin

#define argp_fmtstream_rmargin line_wrap_rmargin

#define __argp_fmtstream_set_rmargin line_wrap_set_rmargin

#define argp_fmtstream_set_rmargin line_wrap_set_rmargin

#define __argp_fmtstream_wmargin line_wrap_wmargin

#define argp_fmtstream_wmargin line_wrap_wmargin

#define __argp_fmtstream_set_wmargin line_wrap_set_wmargin

#define argp_fmtstream_set_wmargin line_wrap_set_wmargin

#define __argp_fmtstream_point line_wrap_point

#define argp_fmtstream_point line_wrap_point

#else /* !ARGP_FMTSTREAM_USE_LINEWRAP */

/* Guess we have to define our own version.  */

#ifndef __const

#define __const const

#endif

struct argp_fmtstream

{

  FILE *stream;                 /* The stream we're outputting to.  */

  size_t lmargin, rmargin;      /* Left and right margins.  */

  ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */

  /* Point in buffer to which we've processed for wrapping, but not output.  */

  size_t point_offs;

  /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */

  ssize_t point_col;

  char *buf;                    /* Output buffer.  */

  char *p;                      /* Current end of text in BUF. */

  char *end;                    /* Absolute end of BUF.  */

};

typedef struct argp_fmtstream *argp_fmtstream_t;

/* Return an argp_fmtstream that outputs to STREAM, and which 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 NULL if there was an error.  */

extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,

                                               size_t __lmargin,

                                               size_t __rmargin,

                                               ssize_t __wmargin);

extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,

                                             size_t __lmargin,

                                             size_t __rmargin,

                                             ssize_t __wmargin);

/* Flush __FS to its stream, and free it (but don't close the stream).  */

extern void __argp_fmtstream_free (argp_fmtstream_t __fs);

extern void argp_fmtstream_free (argp_fmtstream_t __fs);

extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,

                                       __const char *__fmt, ...)

     __attribute__ ((__format__ (printf, 2, 3)));

extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,

                                      __const char *__fmt, ...)

     __attribute__ ((__format__ (printf, 2, 3)));

extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);

extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);

extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);

extern int argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);

extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,

                                      __const char *__str, size_t __len);

extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,

                                    __const char *__str, size_t __len);

/* Access macros for various bits of state.  */

#define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)

#define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)

#define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)

#define __argp_fmtstream_lmargin argp_fmtstream_lmargin

#define __argp_fmtstream_rmargin argp_fmtstream_rmargin

#define __argp_fmtstream_wmargin argp_fmtstream_wmargin

/* Set __FS's left margin to LMARGIN and return the old value.  */

extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,

                                          size_t __lmargin);

extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,

                                            size_t __lmargin);

/* Set __FS's right margin to __RMARGIN and return the old value.  */

extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,

                                          size_t __rmargin);

extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,

                                            size_t __rmargin);

/* Set __FS's wrap margin to __WMARGIN and return the old value.  */

extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,

                                          size_t __wmargin);

extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,

                                            size_t __wmargin);

/* Return the column number of the current output point in __FS.  */

extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);

extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);

/* Internal routines.  */

extern void _argp_fmtstream_update (argp_fmtstream_t __fs);

extern void __argp_fmtstream_update (argp_fmtstream_t __fs);

extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);

extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);

#ifdef __OPTIMIZE__

/* Inline versions of above routines.  */

#if !_LIBC

#define __argp_fmtstream_putc argp_fmtstream_putc

#define __argp_fmtstream_puts argp_fmtstream_puts

#define __argp_fmtstream_write argp_fmtstream_write

#define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin

#define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin

#define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin

#define __argp_fmtstream_point argp_fmtstream_point

#define __argp_fmtstream_update _argp_fmtstream_update

#define __argp_fmtstream_ensure _argp_fmtstream_ensure

#endif

#ifndef ARGP_FS_EI

#define ARGP_FS_EI extern inline

#endif

ARGP_FS_EI size_t

__argp_fmtstream_write (argp_fmtstream_t __fs,

                        __const char *__str, size_t __len)

{

  if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))

    {

      memcpy (__fs->p, __str, __len);

      __fs->p += __len;

      return __len;

    }

  else

    return 0;

}

ARGP_FS_EI int

__argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str)

{

  size_t __len = strlen (__str);

  if (__len)

    {

      size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);

      return __wrote == __len ? 0 : -1;

    }

  else

    return 0;

}

ARGP_FS_EI int

__argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)

{

  if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))

    return *__fs->p++ = __ch;

  else

    return EOF;

}

/* Set __FS's left margin to __LMARGIN and return the old value.  */

ARGP_FS_EI size_t

__argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)

{

  size_t __old;

  if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)

    __argp_fmtstream_update (__fs);

  __old = __fs->lmargin;

  __fs->lmargin = __lmargin;

  return __old;

}

/* Set __FS's right margin to __RMARGIN and return the old value.  */

ARGP_FS_EI size_t

__argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)

{

  size_t __old;

  if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)

    __argp_fmtstream_update (__fs);

  __old = __fs->rmargin;

  __fs->rmargin = __rmargin;

  return __old;

}

/* Set FS's wrap margin to __WMARGIN and return the old value.  */

ARGP_FS_EI size_t

__argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)

{

  size_t __old;

  if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)

    __argp_fmtstream_update (__fs);

  __old = __fs->wmargin;

  __fs->wmargin = __wmargin;

  return __old;

}

/* Return the column number of the current output point in __FS.  */

ARGP_FS_EI size_t

__argp_fmtstream_point (argp_fmtstream_t __fs)

{

  if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)

    __argp_fmtstream_update (__fs);

  return __fs->point_col >= 0 ? __fs->point_col : 0;

}

#if !_LIBC

#undef __argp_fmtstream_putc

#undef __argp_fmtstream_puts

#undef __argp_fmtstream_write

#undef __argp_fmtstream_set_lmargin

#undef __argp_fmtstream_set_rmargin

#undef __argp_fmtstream_set_wmargin

#undef __argp_fmtstream_point

#undef __argp_fmtstream_update

#undef __argp_fmtstream_ensure

#endif

#endif /* __OPTIMIZE__ */

#endif /* ARGP_FMTSTREAM_USE_LINEWRAP */

#endif /* argp-fmtstream.h */