1 /* Word-wrapping and line-truncating streams.
2 Copyright (C) 1997, 2011, 2012 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Written by Miles Bader <miles@gnu.ai.mit.edu>.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 /* This package emulates glibc `line_wrap_stream' semantics for systems that
22 don't have that. If the system does have it, it is just a wrapper for
23 that. This header file is only used internally while compiling argp, and
24 shouldn't be installed. */
26 #ifndef _ARGP_FMTSTREAM_H
27 #define _ARGP_FMTSTREAM_H
34 /* This feature is available in gcc versions 2.5 and later. */
35 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
36 # define __attribute__(Spec) /* empty */
38 /* The __-protected variants of `format' and `printf' attributes
39 are accepted by gcc versions 2.6.4 (effectively 2.7) and later. */
40 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || __STRICT_ANSI__
41 # define __format__ format
42 # define __printf__ printf
46 #if defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H)
47 /* line_wrap_stream is available, so use that. */
48 #define ARGP_FMTSTREAM_USE_LINEWRAP
51 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
52 /* Just be a simple wrapper for line_wrap_stream; the semantics are
53 *slightly* different, as line_wrap_stream doesn't actually make a new
54 object, it just modifies the given stream (reversibly) to do
55 line-wrapping. Since we control who uses this code, it doesn't matter. */
59 typedef FILE *argp_fmtstream_t;
61 #define argp_make_fmtstream line_wrap_stream
62 #define __argp_make_fmtstream line_wrap_stream
63 #define argp_fmtstream_free line_unwrap_stream
64 #define __argp_fmtstream_free line_unwrap_stream
66 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
67 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
68 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
69 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
70 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
71 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
72 #define __argp_fmtstream_printf fprintf
73 #define argp_fmtstream_printf fprintf
75 #define __argp_fmtstream_lmargin line_wrap_lmargin
76 #define argp_fmtstream_lmargin line_wrap_lmargin
77 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
78 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
79 #define __argp_fmtstream_rmargin line_wrap_rmargin
80 #define argp_fmtstream_rmargin line_wrap_rmargin
81 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
82 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
83 #define __argp_fmtstream_wmargin line_wrap_wmargin
84 #define argp_fmtstream_wmargin line_wrap_wmargin
85 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
86 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
87 #define __argp_fmtstream_point line_wrap_point
88 #define argp_fmtstream_point line_wrap_point
90 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
91 /* Guess we have to define our own version. */
96 FILE *stream; /* The stream we're outputting to. */
98 size_t lmargin, rmargin; /* Left and right margins. */
99 ssize_t wmargin; /* Margin to wrap to, or -1 to truncate. */
101 /* Point in buffer to which we've processed for wrapping, but not output. */
103 /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin. */
106 char *buf; /* Output buffer. */
107 char *p; /* Current end of text in BUF. */
108 char *end; /* Absolute end of BUF. */
111 typedef struct argp_fmtstream *argp_fmtstream_t;
113 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
114 written on it with LMARGIN spaces and limits them to RMARGIN columns
115 total. If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
116 replacing the whitespace before them with a newline and WMARGIN spaces.
117 Otherwise, chars beyond RMARGIN are simply dropped until a newline.
118 Returns NULL if there was an error. */
119 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
123 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
128 /* Flush __FS to its stream, and free it (but don't close the stream). */
129 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
130 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
132 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
133 const char *__fmt, ...)
134 __attribute__ ((__format__ (printf, 2, 3)));
135 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
136 const char *__fmt, ...)
137 __attribute__ ((__format__ (printf, 2, 3)));
139 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
140 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
142 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
143 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
145 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
146 const char *__str, size_t __len);
147 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
148 const char *__str, size_t __len);
150 /* Access macros for various bits of state. */
151 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
152 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
153 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
154 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
155 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
156 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
158 /* Set __FS's left margin to LMARGIN and return the old value. */
159 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
161 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
164 /* Set __FS's right margin to __RMARGIN and return the old value. */
165 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
167 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
170 /* Set __FS's wrap margin to __WMARGIN and return the old value. */
171 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
173 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
176 /* Return the column number of the current output point in __FS. */
177 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
178 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
180 /* Internal routines. */
181 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
182 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
183 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
184 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
187 /* Inline versions of above routines. */
190 #define __argp_fmtstream_putc argp_fmtstream_putc
191 #define __argp_fmtstream_puts argp_fmtstream_puts
192 #define __argp_fmtstream_write argp_fmtstream_write
193 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
194 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
195 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
196 #define __argp_fmtstream_point argp_fmtstream_point
197 #define __argp_fmtstream_update _argp_fmtstream_update
198 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
202 #define ARGP_FS_EI extern inline
206 __argp_fmtstream_write (argp_fmtstream_t __fs, const char *__str, size_t __len)
208 if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
210 memcpy (__fs->p, __str, __len);
219 __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str)
221 size_t __len = strlen (__str);
224 size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
225 return __wrote == __len ? 0 : -1;
232 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
234 if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
235 return *__fs->p++ = __ch;
240 /* Set __FS's left margin to __LMARGIN and return the old value. */
242 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
245 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
246 __argp_fmtstream_update (__fs);
247 __old = __fs->lmargin;
248 __fs->lmargin = __lmargin;
252 /* Set __FS's right margin to __RMARGIN and return the old value. */
254 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
257 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
258 __argp_fmtstream_update (__fs);
259 __old = __fs->rmargin;
260 __fs->rmargin = __rmargin;
264 /* Set FS's wrap margin to __WMARGIN and return the old value. */
266 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
269 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
270 __argp_fmtstream_update (__fs);
271 __old = __fs->wmargin;
272 __fs->wmargin = __wmargin;
276 /* Return the column number of the current output point in __FS. */
278 __argp_fmtstream_point (argp_fmtstream_t __fs)
280 if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
281 __argp_fmtstream_update (__fs);
282 return __fs->point_col >= 0 ? __fs->point_col : 0;
286 #undef __argp_fmtstream_putc
287 #undef __argp_fmtstream_puts
288 #undef __argp_fmtstream_write
289 #undef __argp_fmtstream_set_lmargin
290 #undef __argp_fmtstream_set_rmargin
291 #undef __argp_fmtstream_set_wmargin
292 #undef __argp_fmtstream_point
293 #undef __argp_fmtstream_update
294 #undef __argp_fmtstream_ensure
297 #endif /* __OPTIMIZE__ */
299 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
301 #endif /* argp-fmtstream.h */