/* Word-wrapping and line-truncating streams.
   Copyright (C) 1997-2021 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, see
   <https://www.gnu.org/licenses/>.  */

/* 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

#include <stdio.h>
#include <string.h>
#if defined(HAVE_UNISTD_H)
#include <unistd.h>
#endif

#ifndef PRINTF_STYLE
#if __GNUC__ >= 2
#define PRINTF_STYLE(f, a) __attribute__((__format__(__printf__, f, a)))
#else
#define PRINTF_STYLE(f, a)
#endif
#endif

#ifdef _WIN32
typedef ptrdiff_t ssize_t;
#endif

#if 0
/* 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.  */


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, ...) PRINTF_STYLE(2, 3);
extern ssize_t
argp_fmtstream_printf(argp_fmtstream_t __fs, const char* __fmt, ...) PRINTF_STYLE(2, 3);


/* 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

/* 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);

#if 1
/* Inline versions of above routines.  */

#if 1
#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 static 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 1
#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 */