argp/argp-fmtstream.h

   1 /* Word-wrapping and line-truncating streams.
   2    Copyright (C) 1997-2014 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, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 /* This package emulates glibc `line_wrap_stream' semantics for systems that
  21    don't have that.  If the system does have it, it is just a wrapper for
  22    that.  This header file is only used internally while compiling argp, and
  23    shouldn't be installed.  */
  24
  25 #ifndef _ARGP_FMTSTREAM_H
  26 #define _ARGP_FMTSTREAM_H
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <unistd.h>
  31
  32 #ifndef __attribute__
  33 /* This feature is available in gcc versions 2.5 and later.  */
  34 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
  35 #  define __attribute__(Spec) /* empty */
  36 # endif
  37 /* The __-protected variants of `format' and `printf' attributes
  38    are accepted by gcc versions 2.6.4 (effectively 2.7) and later.  */
  39 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 7) || __STRICT_ANSI__
  40 #  define __format__ format
  41 #  define __printf__ printf
  42 # endif
  43 #endif
  44
  45 #if defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H)
  46 /* line_wrap_stream is available, so use that.  */
  47 #define ARGP_FMTSTREAM_USE_LINEWRAP
  48 #endif
  49
  50 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
  51 /* Just be a simple wrapper for line_wrap_stream; the semantics are
  52    *slightly* different, as line_wrap_stream doesn't actually make a new
  53    object, it just modifies the given stream (reversibly) to do
  54    line-wrapping.  Since we control who uses this code, it doesn't matter.  */
  55
  56 #include <linewrap.h>
  57
  58 typedef FILE *argp_fmtstream_t;
  59
  60 #define argp_make_fmtstream line_wrap_stream
  61 #define __argp_make_fmtstream line_wrap_stream
  62 #define argp_fmtstream_free line_unwrap_stream
  63 #define __argp_fmtstream_free line_unwrap_stream
  64
  65 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
  66 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
  67 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
  68 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
  69 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  70 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  71 #define __argp_fmtstream_printf fprintf
  72 #define argp_fmtstream_printf fprintf
  73
  74 #define __argp_fmtstream_lmargin line_wrap_lmargin
  75 #define argp_fmtstream_lmargin line_wrap_lmargin
  76 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
  77 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
  78 #define __argp_fmtstream_rmargin line_wrap_rmargin
  79 #define argp_fmtstream_rmargin line_wrap_rmargin
  80 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
  81 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
  82 #define __argp_fmtstream_wmargin line_wrap_wmargin
  83 #define argp_fmtstream_wmargin line_wrap_wmargin
  84 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
  85 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
  86 #define __argp_fmtstream_point line_wrap_point
  87 #define argp_fmtstream_point line_wrap_point
  88
  89 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
  90 /* Guess we have to define our own version.  */
  91
  92 \f
  93 struct argp_fmtstream
  94 {
  95   FILE *stream;                 /* The stream we're outputting to.  */
  96
  97   size_t lmargin, rmargin;      /* Left and right margins.  */
  98   ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */
  99
 100   /* Point in buffer to which we've processed for wrapping, but not output.  */
 101   size_t point_offs;
 102   /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */
 103   ssize_t point_col;
 104
 105   char *buf;                    /* Output buffer.  */
 106   char *p;                      /* Current end of text in BUF. */
 107   char *end;                    /* Absolute end of BUF.  */
 108 };
 109
 110 typedef struct argp_fmtstream *argp_fmtstream_t;
 111
 112 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
 113    written on it with LMARGIN spaces and limits them to RMARGIN columns
 114    total.  If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
 115    replacing the whitespace before them with a newline and WMARGIN spaces.
 116    Otherwise, chars beyond RMARGIN are simply dropped until a newline.
 117    Returns NULL if there was an error.  */
 118 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
 119                                                size_t __lmargin,
 120                                                size_t __rmargin,
 121                                                ssize_t __wmargin);
 122 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
 123                                              size_t __lmargin,
 124                                              size_t __rmargin,
 125                                              ssize_t __wmargin);
 126
 127 /* Flush __FS to its stream, and free it (but don't close the stream).  */
 128 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
 129 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
 130
 131 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
 132                                         const char *__fmt, ...)
 133      __attribute__ ((__format__ (printf, 2, 3)));
 134 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
 135                                       const char *__fmt, ...)
 136      __attribute__ ((__format__ (printf, 2, 3)));
 137
 138 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 139 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 140
 141 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
 142 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
 143
 144 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
 145                                       const char *__str, size_t __len);
 146 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
 147                                     const char *__str, size_t __len);
 148 \f
 149 /* Access macros for various bits of state.  */
 150 #define argp_fmtstream_lmargin(__fs) ((__fs)->lmargin)
 151 #define argp_fmtstream_rmargin(__fs) ((__fs)->rmargin)
 152 #define argp_fmtstream_wmargin(__fs) ((__fs)->wmargin)
 153 #define __argp_fmtstream_lmargin argp_fmtstream_lmargin
 154 #define __argp_fmtstream_rmargin argp_fmtstream_rmargin
 155 #define __argp_fmtstream_wmargin argp_fmtstream_wmargin
 156
 157 /* Set __FS's left margin to LMARGIN and return the old value.  */
 158 extern size_t argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 159                                           size_t __lmargin);
 160 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 161                                             size_t __lmargin);
 162
 163 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 164 extern size_t argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 165                                           size_t __rmargin);
 166 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 167                                             size_t __rmargin);
 168
 169 /* Set __FS's wrap margin to __WMARGIN and return the old value.  */
 170 extern size_t argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 171                                           size_t __wmargin);
 172 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 173                                             size_t __wmargin);
 174
 175 /* Return the column number of the current output point in __FS.  */
 176 extern size_t argp_fmtstream_point (argp_fmtstream_t __fs);
 177 extern size_t __argp_fmtstream_point (argp_fmtstream_t __fs);
 178
 179 /* Internal routines.  */
 180 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
 181 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
 182 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 183 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 184 \f
 185 #ifdef __OPTIMIZE__
 186 /* Inline versions of above routines.  */
 187
 188 #if !_LIBC
 189 #define __argp_fmtstream_putc argp_fmtstream_putc
 190 #define __argp_fmtstream_puts argp_fmtstream_puts
 191 #define __argp_fmtstream_write argp_fmtstream_write
 192 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
 193 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
 194 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
 195 #define __argp_fmtstream_point argp_fmtstream_point
 196 #define __argp_fmtstream_update _argp_fmtstream_update
 197 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
 198 #endif
 199
 200 #ifndef ARGP_FS_EI
 201 #define ARGP_FS_EI extern inline
 202 #endif
 203
 204 ARGP_FS_EI size_t
 205 __argp_fmtstream_write (argp_fmtstream_t __fs, const char *__str, size_t __len)
 206 {
 207   if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
 208     {
 209       memcpy (__fs->p, __str, __len);
 210       __fs->p += __len;
 211       return __len;
 212     }
 213   else
 214     return 0;
 215 }
 216
 217 ARGP_FS_EI int
 218 __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str)
 219 {
 220   size_t __len = strlen (__str);
 221   if (__len)
 222     {
 223       size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
 224       return __wrote == __len ? 0 : -1;
 225     }
 226   else
 227     return 0;
 228 }
 229
 230 ARGP_FS_EI int
 231 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
 232 {
 233   if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
 234     return *__fs->p++ = __ch;
 235   else
 236     return EOF;
 237 }
 238
 239 /* Set __FS's left margin to __LMARGIN and return the old value.  */
 240 ARGP_FS_EI size_t
 241 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
 242 {
 243   size_t __old;
 244   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 245     __argp_fmtstream_update (__fs);
 246   __old = __fs->lmargin;
 247   __fs->lmargin = __lmargin;
 248   return __old;
 249 }
 250
 251 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 252 ARGP_FS_EI size_t
 253 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
 254 {
 255   size_t __old;
 256   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 257     __argp_fmtstream_update (__fs);
 258   __old = __fs->rmargin;
 259   __fs->rmargin = __rmargin;
 260   return __old;
 261 }
 262
 263 /* Set FS's wrap margin to __WMARGIN and return the old value.  */
 264 ARGP_FS_EI size_t
 265 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
 266 {
 267   size_t __old;
 268   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 269     __argp_fmtstream_update (__fs);
 270   __old = __fs->wmargin;
 271   __fs->wmargin = __wmargin;
 272   return __old;
 273 }
 274
 275 /* Return the column number of the current output point in __FS.  */
 276 ARGP_FS_EI size_t
 277 __argp_fmtstream_point (argp_fmtstream_t __fs)
 278 {
 279   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 280     __argp_fmtstream_update (__fs);
 281   return __fs->point_col >= 0 ? __fs->point_col : 0;
 282 }
 283
 284 #if !_LIBC
 285 #undef __argp_fmtstream_putc
 286 #undef __argp_fmtstream_puts
 287 #undef __argp_fmtstream_write
 288 #undef __argp_fmtstream_set_lmargin
 289 #undef __argp_fmtstream_set_rmargin
 290 #undef __argp_fmtstream_set_wmargin
 291 #undef __argp_fmtstream_point
 292 #undef __argp_fmtstream_update
 293 #undef __argp_fmtstream_ensure
 294 #endif
 295
 296 #endif /* __OPTIMIZE__ */
 297
 298 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
 299
 300 #endif /* argp-fmtstream.h */