argp/argp-fmtstream.h

   1 /* Word-wrapping and line-truncating streams.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>.
   5
   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.
  10
  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.
  15
  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
  19    02111-1307 USA.  */
  20
  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.  */
  25
  26 #ifndef _ARGP_FMTSTREAM_H
  27 #define _ARGP_FMTSTREAM_H
  28
  29 #include <stdio.h>
  30 #include <string.h>
  31 #include <unistd.h>
  32
  33 #ifndef __attribute__
  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 */
  37 # endif
  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
  43 # endif
  44 #endif
  45
  46 #if    (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
  47     || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))
  48 /* line_wrap_stream is available, so use that.  */
  49 #define ARGP_FMTSTREAM_USE_LINEWRAP
  50 #endif
  51
  52 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
  53 /* Just be a simple wrapper for line_wrap_stream; the semantics are
  54    *slightly* different, as line_wrap_stream doesn't actually make a new
  55    object, it just modifies the given stream (reversibly) to do
  56    line-wrapping.  Since we control who uses this code, it doesn't matter.  */
  57
  58 #include <linewrap.h>
  59
  60 typedef FILE *argp_fmtstream_t;
  61
  62 #define argp_make_fmtstream line_wrap_stream
  63 #define __argp_make_fmtstream line_wrap_stream
  64 #define argp_fmtstream_free line_unwrap_stream
  65 #define __argp_fmtstream_free line_unwrap_stream
  66
  67 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
  68 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
  69 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
  70 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
  71 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  72 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  73 #define __argp_fmtstream_printf fprintf
  74 #define argp_fmtstream_printf fprintf
  75
  76 #define __argp_fmtstream_lmargin line_wrap_lmargin
  77 #define argp_fmtstream_lmargin line_wrap_lmargin
  78 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
  79 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
  80 #define __argp_fmtstream_rmargin line_wrap_rmargin
  81 #define argp_fmtstream_rmargin line_wrap_rmargin
  82 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
  83 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
  84 #define __argp_fmtstream_wmargin line_wrap_wmargin
  85 #define argp_fmtstream_wmargin line_wrap_wmargin
  86 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
  87 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
  88 #define __argp_fmtstream_point line_wrap_point
  89 #define argp_fmtstream_point line_wrap_point
  90
  91 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
  92 /* Guess we have to define our own version.  */
  93
  94 #ifndef __const
  95 #define __const const
  96 #endif
  97 \f
  98 struct argp_fmtstream
  99 {
 100   FILE *stream;                 /* The stream we're outputting to.  */
 101
 102   size_t lmargin, rmargin;      /* Left and right margins.  */
 103   ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */
 104
 105   /* Point in buffer to which we've processed for wrapping, but not output.  */
 106   size_t point_offs;
 107   /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */
 108   ssize_t point_col;
 109
 110   char *buf;                    /* Output buffer.  */
 111   char *p;                      /* Current end of text in BUF. */
 112   char *end;                    /* Absolute end of BUF.  */
 113 };
 114
 115 typedef struct argp_fmtstream *argp_fmtstream_t;
 116
 117 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
 118    written on it with LMARGIN spaces and limits them to RMARGIN columns
 119    total.  If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
 120    replacing the whitespace before them with a newline and WMARGIN spaces.
 121    Otherwise, chars beyond RMARGIN are simply dropped until a newline.
 122    Returns NULL if there was an error.  */
 123 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
 124                                                size_t __lmargin,
 125                                                size_t __rmargin,
 126                                                ssize_t __wmargin);
 127 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
 128                                              size_t __lmargin,
 129                                              size_t __rmargin,
 130                                              ssize_t __wmargin);
 131
 132 /* Flush __FS to its stream, and free it (but don't close the stream).  */
 133 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
 134 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
 135
 136 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
 137                                        __const char *__fmt, ...)
 138      __attribute__ ((__format__ (printf, 2, 3)));
 139 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
 140                                       __const char *__fmt, ...)
 141      __attribute__ ((__format__ (printf, 2, 3)));
 142
 143 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 144 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 145
 146 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 147 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 148
 149 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
 150                                       __const char *__str, size_t __len);
 151 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
 152                                     __const char *__str, size_t __len);
 153 \f
 154 /* Access macros for various bits of state.  */
 155 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
 156 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
 157 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
 158 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
 159 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
 160 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
 161
 162 /* Set __FS's left margin to LMARGIN and return the old value.  */
 163 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 164                                           size_t __lmargin);
 165 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 166                                             size_t __lmargin);
 167
 168 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 169 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 170                                           size_t __rmargin);
 171 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 172                                             size_t __rmargin);
 173
 174 /* Set __FS's wrap margin to __WMARGIN and return the old value.  */
 175 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 176                                           size_t __wmargin);
 177 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 178                                             size_t __wmargin);
 179
 180 /* Return the column number of the current output point in __FS.  */
 181 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
 182 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
 183
 184 /* Internal routines.  */
 185 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
 186 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
 187 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 188 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 189 \f
 190 #ifdef __OPTIMIZE__
 191 /* Inline versions of above routines.  */
 192
 193 #if !_LIBC
 194 #define __argp_fmtstream_putc argp_fmtstream_putc
 195 #define __argp_fmtstream_puts argp_fmtstream_puts
 196 #define __argp_fmtstream_write argp_fmtstream_write
 197 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
 198 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
 199 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
 200 #define __argp_fmtstream_point argp_fmtstream_point
 201 #define __argp_fmtstream_update _argp_fmtstream_update
 202 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
 203 #endif
 204
 205 #ifndef ARGP_FS_EI
 206 #define ARGP_FS_EI extern inline
 207 #endif
 208
 209 ARGP_FS_EI size_t
 210 __argp_fmtstream_write (argp_fmtstream_t __fs,
 211                         __const char *__str, size_t __len)
 212 {
 213   if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
 214     {
 215       memcpy (__fs->p, __str, __len);
 216       __fs->p += __len;
 217       return __len;
 218     }
 219   else
 220     return 0;
 221 }
 222
 223 ARGP_FS_EI int
 224 __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str)
 225 {
 226   size_t __len = strlen (__str);
 227   if (__len)
 228     {
 229       size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
 230       return __wrote == __len ? 0 : -1;
 231     }
 232   else
 233     return 0;
 234 }
 235
 236 ARGP_FS_EI int
 237 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
 238 {
 239   if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
 240     return *__fs->p++ = __ch;
 241   else
 242     return EOF;
 243 }
 244
 245 /* Set __FS's left margin to __LMARGIN and return the old value.  */
 246 ARGP_FS_EI size_t
 247 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
 248 {
 249   size_t __old;
 250   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 251     __argp_fmtstream_update (__fs);
 252   __old = __fs->lmargin;
 253   __fs->lmargin = __lmargin;
 254   return __old;
 255 }
 256
 257 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 258 ARGP_FS_EI size_t
 259 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
 260 {
 261   size_t __old;
 262   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 263     __argp_fmtstream_update (__fs);
 264   __old = __fs->rmargin;
 265   __fs->rmargin = __rmargin;
 266   return __old;
 267 }
 268
 269 /* Set FS's wrap margin to __WMARGIN and return the old value.  */
 270 ARGP_FS_EI size_t
 271 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
 272 {
 273   size_t __old;
 274   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 275     __argp_fmtstream_update (__fs);
 276   __old = __fs->wmargin;
 277   __fs->wmargin = __wmargin;
 278   return __old;
 279 }
 280
 281 /* Return the column number of the current output point in __FS.  */
 282 ARGP_FS_EI size_t
 283 __argp_fmtstream_point (argp_fmtstream_t __fs)
 284 {
 285   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 286     __argp_fmtstream_update (__fs);
 287   return __fs->point_col >= 0 ? __fs->point_col : 0;
 288 }
 289
 290 #if !_LIBC
 291 #undef __argp_fmtstream_putc
 292 #undef __argp_fmtstream_puts
 293 #undef __argp_fmtstream_write
 294 #undef __argp_fmtstream_set_lmargin
 295 #undef __argp_fmtstream_set_rmargin
 296 #undef __argp_fmtstream_set_wmargin
 297 #undef __argp_fmtstream_point
 298 #undef __argp_fmtstream_update
 299 #undef __argp_fmtstream_ensure
 300 #endif
 301
 302 #endif /* __OPTIMIZE__ */
 303
 304 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
 305
 306 #endif /* argp-fmtstream.h */