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 #ifdef HAVE_CONFIG_H
  30 #include <config.h>
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36
  37 #ifndef __attribute__
  38 /* This feature is available in gcc versions 2.5 and later.  */
  39 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
  40 #  define __attribute__(Spec) /* empty */
  41 # endif
  42 /* The __-protected variants of `format' and `printf' attributes
  43    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
  44 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || __STRICT_ANSI__
  45 #  define __format__ format
  46 #  define __printf__ printf
  47 # endif
  48 #endif
  49
  50 #if    (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
  51     || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))
  52 /* line_wrap_stream is available, so use that.  */
  53 #define ARGP_FMTSTREAM_USE_LINEWRAP
  54 #endif
  55
  56 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
  57 /* Just be a simple wrapper for line_wrap_stream; the semantics are
  58    *slightly* different, as line_wrap_stream doesn't actually make a new
  59    object, it just modifies the given stream (reversibly) to do
  60    line-wrapping.  Since we control who uses this code, it doesn't matter.  */
  61
  62 #include <linewrap.h>
  63
  64 typedef FILE *argp_fmtstream_t;
  65
  66 #define argp_make_fmtstream line_wrap_stream
  67 #define __argp_make_fmtstream line_wrap_stream
  68 #define argp_fmtstream_free line_unwrap_stream
  69 #define __argp_fmtstream_free line_unwrap_stream
  70
  71 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
  72 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
  73 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
  74 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
  75 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  76 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  77 #define __argp_fmtstream_printf fprintf
  78 #define argp_fmtstream_printf fprintf
  79
  80 #define __argp_fmtstream_lmargin line_wrap_lmargin
  81 #define argp_fmtstream_lmargin line_wrap_lmargin
  82 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
  83 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
  84 #define __argp_fmtstream_rmargin line_wrap_rmargin
  85 #define argp_fmtstream_rmargin line_wrap_rmargin
  86 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
  87 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
  88 #define __argp_fmtstream_wmargin line_wrap_wmargin
  89 #define argp_fmtstream_wmargin line_wrap_wmargin
  90 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
  91 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
  92 #define __argp_fmtstream_point line_wrap_point
  93 #define argp_fmtstream_point line_wrap_point
  94
  95 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
  96 /* Guess we have to define our own version.  */
  97
  98 #ifndef __const
  99 #define __const const
 100 #endif
 101 \f
 102 struct argp_fmtstream
 103 {
 104   FILE *stream;                 /* The stream we're outputting to.  */
 105
 106   size_t lmargin, rmargin;      /* Left and right margins.  */
 107   ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */
 108
 109   /* Point in buffer to which we've processed for wrapping, but not output.  */
 110   size_t point_offs;
 111   /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */
 112   ssize_t point_col;
 113
 114   char *buf;                    /* Output buffer.  */
 115   char *p;                      /* Current end of text in BUF. */
 116   char *end;                    /* Absolute end of BUF.  */
 117 };
 118
 119 typedef struct argp_fmtstream *argp_fmtstream_t;
 120
 121 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
 122    written on it with LMARGIN spaces and limits them to RMARGIN columns
 123    total.  If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
 124    replacing the whitespace before them with a newline and WMARGIN spaces.
 125    Otherwise, chars beyond RMARGIN are simply dropped until a newline.
 126    Returns NULL if there was an error.  */
 127 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
 128                                                size_t __lmargin,
 129                                                size_t __rmargin,
 130                                                ssize_t __wmargin);
 131 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
 132                                              size_t __lmargin,
 133                                              size_t __rmargin,
 134                                              ssize_t __wmargin);
 135
 136 /* Flush __FS to its stream, and free it (but don't close the stream).  */
 137 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
 138 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
 139
 140 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
 141                                        __const char *__fmt, ...)
 142      __attribute__ ((__format__ (printf, 2, 3)));
 143 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
 144                                       __const char *__fmt, ...)
 145      __attribute__ ((__format__ (printf, 2, 3)));
 146
 147 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 148 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 149
 150 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 151 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 152
 153 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
 154                                       __const char *__str, size_t __len);
 155 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
 156                                     __const char *__str, size_t __len);
 157 \f
 158 /* Access macros for various bits of state.  */
 159 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
 160 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
 161 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
 162 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
 163 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
 164 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
 165
 166 /* Set __FS's left margin to LMARGIN and return the old value.  */
 167 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 168                                           size_t __lmargin);
 169 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 170                                             size_t __lmargin);
 171
 172 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 173 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 174                                           size_t __rmargin);
 175 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 176                                             size_t __rmargin);
 177
 178 /* Set __FS's wrap margin to __WMARGIN and return the old value.  */
 179 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 180                                           size_t __wmargin);
 181 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 182                                             size_t __wmargin);
 183
 184 /* Return the column number of the current output point in __FS.  */
 185 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
 186 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
 187
 188 /* Internal routines.  */
 189 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
 190 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
 191 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 192 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 193 \f
 194 #ifdef __OPTIMIZE__
 195 /* Inline versions of above routines.  */
 196
 197 #if !_LIBC
 198 #define __argp_fmtstream_putc argp_fmtstream_putc
 199 #define __argp_fmtstream_puts argp_fmtstream_puts
 200 #define __argp_fmtstream_write argp_fmtstream_write
 201 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
 202 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
 203 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
 204 #define __argp_fmtstream_point argp_fmtstream_point
 205 #define __argp_fmtstream_update _argp_fmtstream_update
 206 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
 207 #endif
 208
 209 #ifndef ARGP_FS_EI
 210 #define ARGP_FS_EI extern inline
 211 #endif
 212
 213 ARGP_FS_EI size_t
 214 __argp_fmtstream_write (argp_fmtstream_t __fs,
 215                         __const char *__str, size_t __len)
 216 {
 217   if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
 218     {
 219       memcpy (__fs->p, __str, __len);
 220       __fs->p += __len;
 221       return __len;
 222     }
 223   else
 224     return 0;
 225 }
 226
 227 ARGP_FS_EI int
 228 __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str)
 229 {
 230   size_t __len = strlen (__str);
 231   if (__len)
 232     {
 233       size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
 234       return __wrote == __len ? 0 : -1;
 235     }
 236   else
 237     return 0;
 238 }
 239
 240 ARGP_FS_EI int
 241 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
 242 {
 243   if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
 244     return *__fs->p++ = __ch;
 245   else
 246     return EOF;
 247 }
 248
 249 /* Set __FS's left margin to __LMARGIN and return the old value.  */
 250 ARGP_FS_EI size_t
 251 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
 252 {
 253   size_t __old;
 254   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 255     __argp_fmtstream_update (__fs);
 256   __old = __fs->lmargin;
 257   __fs->lmargin = __lmargin;
 258   return __old;
 259 }
 260
 261 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 262 ARGP_FS_EI size_t
 263 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
 264 {
 265   size_t __old;
 266   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 267     __argp_fmtstream_update (__fs);
 268   __old = __fs->rmargin;
 269   __fs->rmargin = __rmargin;
 270   return __old;
 271 }
 272
 273 /* Set FS's wrap margin to __WMARGIN and return the old value.  */
 274 ARGP_FS_EI size_t
 275 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
 276 {
 277   size_t __old;
 278   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 279     __argp_fmtstream_update (__fs);
 280   __old = __fs->wmargin;
 281   __fs->wmargin = __wmargin;
 282   return __old;
 283 }
 284
 285 /* Return the column number of the current output point in __FS.  */
 286 ARGP_FS_EI size_t
 287 __argp_fmtstream_point (argp_fmtstream_t __fs)
 288 {
 289   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 290     __argp_fmtstream_update (__fs);
 291   return __fs->point_col >= 0 ? __fs->point_col : 0;
 292 }
 293
 294 #if !_LIBC
 295 #undef __argp_fmtstream_putc
 296 #undef __argp_fmtstream_puts
 297 #undef __argp_fmtstream_write
 298 #undef __argp_fmtstream_set_lmargin
 299 #undef __argp_fmtstream_set_rmargin
 300 #undef __argp_fmtstream_set_wmargin
 301 #undef __argp_fmtstream_point
 302 #undef __argp_fmtstream_update
 303 #undef __argp_fmtstream_ensure
 304 #endif
 305
 306 #endif /* __OPTIMIZE__ */
 307
 308 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
 309
 310 #endif /* argp-fmtstream.h */