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292 lines
10 KiB
C
292 lines
10 KiB
C
/* Word-wrapping and line-truncating streams.
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Copyright (C) 1997-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Miles Bader <miles@gnu.ai.mit.edu>.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* This package emulates glibc `line_wrap_stream' semantics for systems that
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don't have that. If the system does have it, it is just a wrapper for
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that. This header file is only used internally while compiling argp, and
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shouldn't be installed. */
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#ifndef _ARGP_FMTSTREAM_H
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#define _ARGP_FMTSTREAM_H
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#if defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H)
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/* line_wrap_stream is available, so use that. */
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#define ARGP_FMTSTREAM_USE_LINEWRAP
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#endif
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#ifdef ARGP_FMTSTREAM_USE_LINEWRAP
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/* Just be a simple wrapper for line_wrap_stream; the semantics are
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*slightly* different, as line_wrap_stream doesn't actually make a new
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object, it just modifies the given stream (reversibly) to do
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line-wrapping. Since we control who uses this code, it doesn't matter. */
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#include <linewrap.h>
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typedef FILE *argp_fmtstream_t;
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#define argp_make_fmtstream line_wrap_stream
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#define __argp_make_fmtstream line_wrap_stream
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#define argp_fmtstream_free line_unwrap_stream
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#define __argp_fmtstream_free line_unwrap_stream
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#define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
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#define argp_fmtstream_putc(fs,ch) putc(ch,fs)
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#define __argp_fmtstream_puts(fs,str) fputs(str,fs)
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#define argp_fmtstream_puts(fs,str) fputs(str,fs)
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#define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
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#define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
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#define __argp_fmtstream_printf fprintf
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#define argp_fmtstream_printf fprintf
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#define __argp_fmtstream_lmargin line_wrap_lmargin
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#define argp_fmtstream_lmargin line_wrap_lmargin
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#define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
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#define argp_fmtstream_set_lmargin line_wrap_set_lmargin
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#define __argp_fmtstream_rmargin line_wrap_rmargin
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#define argp_fmtstream_rmargin line_wrap_rmargin
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#define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
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#define argp_fmtstream_set_rmargin line_wrap_set_rmargin
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#define __argp_fmtstream_wmargin line_wrap_wmargin
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#define argp_fmtstream_wmargin line_wrap_wmargin
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#define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
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#define argp_fmtstream_set_wmargin line_wrap_set_wmargin
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#define __argp_fmtstream_point line_wrap_point
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#define argp_fmtstream_point line_wrap_point
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#else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
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/* Guess we have to define our own version. */
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struct argp_fmtstream
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{
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FILE *stream; /* The stream we're outputting to. */
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size_t lmargin, rmargin; /* Left and right margins. */
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ssize_t wmargin; /* Margin to wrap to, or -1 to truncate. */
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/* Point in buffer to which we've processed for wrapping, but not output. */
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size_t point_offs;
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/* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin. */
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ssize_t point_col;
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char *buf; /* Output buffer. */
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char *p; /* Current end of text in BUF. */
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char *end; /* Absolute end of BUF. */
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};
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typedef struct argp_fmtstream *argp_fmtstream_t;
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__BEGIN_DECLS
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/* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
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written on it with LMARGIN spaces and limits them to RMARGIN columns
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total. If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
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replacing the whitespace before them with a newline and WMARGIN spaces.
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Otherwise, chars beyond RMARGIN are simply dropped until a newline.
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Returns NULL if there was an error. */
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extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
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size_t __lmargin,
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size_t __rmargin,
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ssize_t __wmargin);
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extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
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size_t __lmargin,
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size_t __rmargin,
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ssize_t __wmargin);
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/* Flush __FS to its stream, and free it (but don't close the stream). */
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extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
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extern void argp_fmtstream_free (argp_fmtstream_t __fs);
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extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
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const char *__fmt, ...)
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__attribute__ ((__format__ (printf, 2, 3)));
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extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
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const char *__fmt, ...)
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__attribute__ ((__format__ (printf, 2, 3)));
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extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
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extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
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extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
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extern int argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
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extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
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const char *__str, size_t __len);
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extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
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const char *__str, size_t __len);
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/* Access macros for various bits of state. */
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#define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
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#define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
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#define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
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#define __argp_fmtstream_lmargin argp_fmtstream_lmargin
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#define __argp_fmtstream_rmargin argp_fmtstream_rmargin
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#define __argp_fmtstream_wmargin argp_fmtstream_wmargin
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/* Set __FS's left margin to LMARGIN and return the old value. */
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extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
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size_t __lmargin);
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extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
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size_t __lmargin);
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/* Set __FS's right margin to __RMARGIN and return the old value. */
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extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
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size_t __rmargin);
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extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
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size_t __rmargin);
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/* Set __FS's wrap margin to __WMARGIN and return the old value. */
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extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
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size_t __wmargin);
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extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
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size_t __wmargin);
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/* Return the column number of the current output point in __FS. */
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extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
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extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
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/* Internal routines. */
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extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
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extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
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extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
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extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
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#ifdef __OPTIMIZE__
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/* Inline versions of above routines. */
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#if !_LIBC
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#define __argp_fmtstream_putc argp_fmtstream_putc
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#define __argp_fmtstream_puts argp_fmtstream_puts
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#define __argp_fmtstream_write argp_fmtstream_write
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#define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
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#define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
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#define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
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#define __argp_fmtstream_point argp_fmtstream_point
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#define __argp_fmtstream_update _argp_fmtstream_update
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#define __argp_fmtstream_ensure _argp_fmtstream_ensure
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#endif
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#ifndef ARGP_FS_EI
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#define ARGP_FS_EI extern inline
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#endif
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ARGP_FS_EI size_t
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__argp_fmtstream_write (argp_fmtstream_t __fs, const char *__str, size_t __len)
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{
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if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
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{
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memcpy (__fs->p, __str, __len);
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__fs->p += __len;
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return __len;
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}
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else
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return 0;
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}
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ARGP_FS_EI int
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__argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str)
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{
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size_t __len = strlen (__str);
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if (__len)
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{
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size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
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return __wrote == __len ? 0 : -1;
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}
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else
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return 0;
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}
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ARGP_FS_EI int
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__argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
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{
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if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
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return *__fs->p++ = __ch;
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else
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return EOF;
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}
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/* Set __FS's left margin to __LMARGIN and return the old value. */
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ARGP_FS_EI size_t
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__argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
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{
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size_t __old;
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if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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__argp_fmtstream_update (__fs);
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__old = __fs->lmargin;
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__fs->lmargin = __lmargin;
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return __old;
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}
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/* Set __FS's right margin to __RMARGIN and return the old value. */
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ARGP_FS_EI size_t
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__argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
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{
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size_t __old;
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if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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__argp_fmtstream_update (__fs);
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__old = __fs->rmargin;
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__fs->rmargin = __rmargin;
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return __old;
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}
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/* Set FS's wrap margin to __WMARGIN and return the old value. */
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ARGP_FS_EI size_t
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__argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
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{
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size_t __old;
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if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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__argp_fmtstream_update (__fs);
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__old = __fs->wmargin;
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__fs->wmargin = __wmargin;
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return __old;
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}
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/* Return the column number of the current output point in __FS. */
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ARGP_FS_EI size_t
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__argp_fmtstream_point (argp_fmtstream_t __fs)
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{
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if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
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__argp_fmtstream_update (__fs);
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return __fs->point_col >= 0 ? __fs->point_col : 0;
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}
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#if !_LIBC
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#undef __argp_fmtstream_putc
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#undef __argp_fmtstream_puts
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#undef __argp_fmtstream_write
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#undef __argp_fmtstream_set_lmargin
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#undef __argp_fmtstream_set_rmargin
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#undef __argp_fmtstream_set_wmargin
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#undef __argp_fmtstream_point
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#undef __argp_fmtstream_update
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#undef __argp_fmtstream_ensure
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#endif
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#endif /* __OPTIMIZE__ */
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__END_DECLS
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#endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
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#endif /* argp-fmtstream.h */
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