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 Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 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 #if    (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
  38     || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))
  39 /* line_wrap_stream is available, so use that.  */
  40 #define ARGP_FMTSTREAM_USE_LINEWRAP
  41 #endif
  42
  43 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
  44 /* Just be a simple wrapper for line_wrap_stream; the semantics are
  45    *slightly* different, as line_wrap_stream doesn't actually make a new
  46    object, it just modifies the given stream (reversibly) to do
  47    line-wrapping.  Since we control who uses this code, it doesn't matter.  */
  48
  49 #include <linewrap.h>
  50
  51 typedef FILE *argp_fmtstream_t;
  52
  53 #define argp_make_fmtstream line_wrap_stream
  54 #define __argp_make_fmtstream line_wrap_stream
  55 #define argp_fmtstream_free line_unwrap_stream
  56 #define __argp_fmtstream_free line_unwrap_stream
  57
  58 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
  59 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
  60 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
  61 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
  62 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  63 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  64 #define __argp_fmtstream_printf fprintf
  65 #define argp_fmtstream_printf fprintf
  66
  67 #define __argp_fmtstream_lmargin line_wrap_lmargin
  68 #define argp_fmtstream_lmargin line_wrap_lmargin
  69 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
  70 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
  71 #define __argp_fmtstream_rmargin line_wrap_rmargin
  72 #define argp_fmtstream_rmargin line_wrap_rmargin
  73 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
  74 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
  75 #define __argp_fmtstream_wmargin line_wrap_wmargin
  76 #define argp_fmtstream_wmargin line_wrap_wmargin
  77 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
  78 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
  79 #define __argp_fmtstream_point line_wrap_point
  80 #define argp_fmtstream_point line_wrap_point
  81
  82 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
  83 /* Guess we have to define our own version.  */
  84
  85 #ifndef __const
  86 #define __const const
  87 #endif
  88 \f
  89 struct argp_fmtstream
  90 {
  91   FILE *stream;                 /* The stream we're outputting to.  */
  92
  93   size_t lmargin, rmargin;      /* Left and right margins.  */
  94   ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */
  95
  96   /* Point in buffer to which we've processed for wrapping, but not output.  */
  97   size_t point_offs;
  98   /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */
  99   ssize_t point_col;
 100
 101   char *buf;                    /* Output buffer.  */
 102   char *p;                      /* Current end of text in BUF. */
 103   char *end;                    /* Absolute end of BUF.  */
 104 };
 105
 106 typedef struct argp_fmtstream *argp_fmtstream_t;
 107
 108 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
 109    written on it with LMARGIN spaces and limits them to RMARGIN columns
 110    total.  If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
 111    replacing the whitespace before them with a newline and WMARGIN spaces.
 112    Otherwise, chars beyond RMARGIN are simply dropped until a newline.
 113    Returns NULL if there was an error.  */
 114 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
 115                                                size_t __lmargin,
 116                                                size_t __rmargin,
 117                                                ssize_t __wmargin);
 118 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
 119                                              size_t __lmargin,
 120                                              size_t __rmargin,
 121                                              ssize_t __wmargin);
 122
 123 /* Flush __FS to its stream, and free it (but don't close the stream).  */
 124 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
 125 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
 126
 127 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
 128                                        __const char *__fmt, ...)
 129      __attribute__ ((__format__ (printf, 2, 3)));
 130 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
 131                                       __const char *__fmt, ...)
 132      __attribute__ ((__format__ (printf, 2, 3)));
 133
 134 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 135 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 136
 137 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 138 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str);
 139
 140 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
 141                                       __const char *__str, size_t __len);
 142 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
 143                                     __const char *__str, size_t __len);
 144 \f
 145 /* Access macros for various bits of state.  */
 146 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
 147 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
 148 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
 149 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
 150 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
 151 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
 152
 153 /* Set __FS's left margin to LMARGIN and return the old value.  */
 154 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 155                                           size_t __lmargin);
 156 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 157                                             size_t __lmargin);
 158
 159 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 160 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 161                                           size_t __rmargin);
 162 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 163                                             size_t __rmargin);
 164
 165 /* Set __FS's wrap margin to __WMARGIN and return the old value.  */
 166 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 167                                           size_t __wmargin);
 168 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 169                                             size_t __wmargin);
 170
 171 /* Return the column number of the current output point in __FS.  */
 172 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
 173 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
 174
 175 /* Internal routines.  */
 176 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
 177 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
 178 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 179 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 180 \f
 181 #ifdef __OPTIMIZE__
 182 /* Inline versions of above routines.  */
 183
 184 #if !_LIBC
 185 #define __argp_fmtstream_putc argp_fmtstream_putc
 186 #define __argp_fmtstream_puts argp_fmtstream_puts
 187 #define __argp_fmtstream_write argp_fmtstream_write
 188 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
 189 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
 190 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
 191 #define __argp_fmtstream_point argp_fmtstream_point
 192 #define __argp_fmtstream_update _argp_fmtstream_update
 193 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
 194 #endif
 195
 196 #ifndef ARGP_FS_EI
 197 #define ARGP_FS_EI extern inline
 198 #endif
 199
 200 ARGP_FS_EI size_t
 201 __argp_fmtstream_write (argp_fmtstream_t __fs,
 202                         __const char *__str, size_t __len)
 203 {
 204   if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
 205     {
 206       memcpy (__fs->p, __str, __len);
 207       __fs->p += __len;
 208       return __len;
 209     }
 210   else
 211     return 0;
 212 }
 213
 214 ARGP_FS_EI int
 215 __argp_fmtstream_puts (argp_fmtstream_t __fs, __const char *__str)
 216 {
 217   size_t __len = strlen (__str);
 218   if (__len)
 219     {
 220       size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
 221       return __wrote == __len ? 0 : -1;
 222     }
 223   else
 224     return 0;
 225 }
 226
 227 ARGP_FS_EI int
 228 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
 229 {
 230   if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
 231     return *__fs->p++ = __ch;
 232   else
 233     return EOF;
 234 }
 235
 236 /* Set __FS's left margin to __LMARGIN and return the old value.  */
 237 ARGP_FS_EI size_t
 238 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
 239 {
 240   size_t __old;
 241   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 242     __argp_fmtstream_update (__fs);
 243   __old = __fs->lmargin;
 244   __fs->lmargin = __lmargin;
 245   return __old;
 246 }
 247
 248 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 249 ARGP_FS_EI size_t
 250 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
 251 {
 252   size_t __old;
 253   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 254     __argp_fmtstream_update (__fs);
 255   __old = __fs->rmargin;
 256   __fs->rmargin = __rmargin;
 257   return __old;
 258 }
 259
 260 /* Set FS's wrap margin to __WMARGIN and return the old value.  */
 261 ARGP_FS_EI size_t
 262 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
 263 {
 264   size_t __old;
 265   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 266     __argp_fmtstream_update (__fs);
 267   __old = __fs->wmargin;
 268   __fs->wmargin = __wmargin;
 269   return __old;
 270 }
 271
 272 /* Return the column number of the current output point in __FS.  */
 273 ARGP_FS_EI size_t
 274 __argp_fmtstream_point (argp_fmtstream_t __fs)
 275 {
 276   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 277     __argp_fmtstream_update (__fs);
 278   return __fs->point_col >= 0 ? __fs->point_col : 0;
 279 }
 280
 281 #if !_LIBC
 282 #undef __argp_fmtstream_putc
 283 #undef __argp_fmtstream_puts
 284 #undef __argp_fmtstream_write
 285 #undef __argp_fmtstream_set_lmargin
 286 #undef __argp_fmtstream_set_rmargin
 287 #undef __argp_fmtstream_set_wmargin
 288 #undef __argp_fmtstream_point
 289 #undef __argp_fmtstream_update
 290 #undef __argp_fmtstream_ensure
 291 #endif
 292
 293 #endif /* __OPTIMIZE__ */
 294
 295 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
 296
 297 #endif /* __ARGP_FMTSTREAM_H__ */