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355 lines
14 KiB
C
355 lines
14 KiB
C
/* Word-wrapping and line-truncating streams.
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Copyright (C) 1997, 2006-2010 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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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://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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#ifndef __attribute__
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/* The __attribute__ feature is available in gcc versions 2.5 and later.
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The __-protected variants of the attributes 'format' and 'printf' are
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accepted by gcc versions 2.6.4 (effectively 2.7) and later.
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We enable __attribute__ only if these are supported too, because
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gnulib and libintl do '#define printf __printf__' when they override
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the 'printf' function. */
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7)
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# define __attribute__(Spec) /* empty */
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# endif
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#endif
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#if (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
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|| (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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/* 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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#if _LIBC || !defined __OPTIMIZE__
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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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#endif
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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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#if _LIBC || !defined __OPTIMIZE__
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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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#endif
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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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# ifdef __GNUC__
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/* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
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inline semantics, unless -fgnu89-inline is used. It defines a macro
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__GNUC_STDC_INLINE__ to indicate this situation or a macro
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__GNUC_GNU_INLINE__ to indicate the opposite situation.
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GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
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semantics but warns, unless -fgnu89-inline is used:
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warning: C99 inline functions are not supported; using GNU89
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warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
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It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
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Whereas Apple GCC 4.0.1 build 5479 without -std=c99 or -std=gnu99
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implements the GNU C inline semantics and defines the macro
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__GNUC_GNU_INLINE__, but it does not warn and does not support
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__attribute__ ((__gnu_inline__)).
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All in all, these are the possible combinations. For every compiler,
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we need to choose ARGP_FS_EI so that the corresponding table cell
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contains an "ok".
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\ ARGP_FS_EI inline extern extern
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\ inline inline
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CC \ __attribute__
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((gnu_inline))
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gcc 4.3.0 error ok ok
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gcc 4.3.0 -std=gnu99 -fgnu89-inline error ok ok
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gcc 4.3.0 -std=gnu99 ok error ok
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gcc 4.2.2 error ok ok
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gcc 4.2.2 -std=gnu99 -fgnu89-inline error ok ok
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gcc 4.2.2 -std=gnu99 error warning ok
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gcc 4.1.2 error ok warning
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gcc 4.1.2 -std=gnu99 error ok warning
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Apple gcc 4.0.1 error ok warning
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Apple gcc 4.0.1 -std=gnu99 ok error warning
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*/
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# if defined __GNUC_STDC_INLINE__
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# define ARGP_FS_EI inline
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# elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
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# define ARGP_FS_EI extern inline __attribute__ ((__gnu_inline__))
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# else
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# define ARGP_FS_EI extern inline
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# endif
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# else
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/* With other compilers, assume the ISO C99 meaning of 'inline', if
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the compiler supports 'inline' at all. */
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# define ARGP_FS_EI inline
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# endif
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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,
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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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#endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
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#endif /* argp-fmtstream.h */
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