gl/argp-fmtstream.h

   1 /* Word-wrapping and line-truncating streams.
   2    Copyright (C) 1997, 2006-2012 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Written by Miles Bader <miles@gnu.ai.mit.edu>.
   5
   6    This program is free software: you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program 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
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 /* This package emulates glibc 'line_wrap_stream' semantics for systems that
  20    don't have that.  If the system does have it, it is just a wrapper for
  21    that.  This header file is only used internally while compiling argp, and
  22    shouldn't be installed.  */
  23
  24 #ifndef _ARGP_FMTSTREAM_H
  25 #define _ARGP_FMTSTREAM_H
  26
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30
  31 /* The __attribute__ feature is available in gcc versions 2.5 and later.
  32    The __-protected variants of the attributes 'format' and 'printf' are
  33    accepted by gcc versions 2.6.4 (effectively 2.7) and later.
  34    We enable _GL_ATTRIBUTE_FORMAT only if these are supported too, because
  35    gnulib and libintl do '#define printf __printf__' when they override
  36    the 'printf' function.  */
  37 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
  38 # define _GL_ATTRIBUTE_FORMAT(spec) __attribute__ ((__format__ spec))
  39 #else
  40 # define _GL_ATTRIBUTE_FORMAT(spec) /* empty */
  41 #endif
  42
  43 #if    (_LIBC - 0 && !defined (USE_IN_LIBIO)) \
  44     || (defined (__GNU_LIBRARY__) && defined (HAVE_LINEWRAP_H))
  45 /* line_wrap_stream is available, so use that.  */
  46 #define ARGP_FMTSTREAM_USE_LINEWRAP
  47 #endif
  48
  49 #ifdef ARGP_FMTSTREAM_USE_LINEWRAP
  50 /* Just be a simple wrapper for line_wrap_stream; the semantics are
  51    *slightly* different, as line_wrap_stream doesn't actually make a new
  52    object, it just modifies the given stream (reversibly) to do
  53    line-wrapping.  Since we control who uses this code, it doesn't matter.  */
  54
  55 #include <linewrap.h>
  56
  57 typedef FILE *argp_fmtstream_t;
  58
  59 #define argp_make_fmtstream line_wrap_stream
  60 #define __argp_make_fmtstream line_wrap_stream
  61 #define argp_fmtstream_free line_unwrap_stream
  62 #define __argp_fmtstream_free line_unwrap_stream
  63
  64 #define __argp_fmtstream_putc(fs,ch) putc(ch,fs)
  65 #define argp_fmtstream_putc(fs,ch) putc(ch,fs)
  66 #define __argp_fmtstream_puts(fs,str) fputs(str,fs)
  67 #define argp_fmtstream_puts(fs,str) fputs(str,fs)
  68 #define __argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  69 #define argp_fmtstream_write(fs,str,len) fwrite(str,1,len,fs)
  70 #define __argp_fmtstream_printf fprintf
  71 #define argp_fmtstream_printf fprintf
  72
  73 #define __argp_fmtstream_lmargin line_wrap_lmargin
  74 #define argp_fmtstream_lmargin line_wrap_lmargin
  75 #define __argp_fmtstream_set_lmargin line_wrap_set_lmargin
  76 #define argp_fmtstream_set_lmargin line_wrap_set_lmargin
  77 #define __argp_fmtstream_rmargin line_wrap_rmargin
  78 #define argp_fmtstream_rmargin line_wrap_rmargin
  79 #define __argp_fmtstream_set_rmargin line_wrap_set_rmargin
  80 #define argp_fmtstream_set_rmargin line_wrap_set_rmargin
  81 #define __argp_fmtstream_wmargin line_wrap_wmargin
  82 #define argp_fmtstream_wmargin line_wrap_wmargin
  83 #define __argp_fmtstream_set_wmargin line_wrap_set_wmargin
  84 #define argp_fmtstream_set_wmargin line_wrap_set_wmargin
  85 #define __argp_fmtstream_point line_wrap_point
  86 #define argp_fmtstream_point line_wrap_point
  87
  88 #else /* !ARGP_FMTSTREAM_USE_LINEWRAP */
  89 /* Guess we have to define our own version.  */
  90 \f
  91 struct argp_fmtstream
  92 {
  93   FILE *stream;                 /* The stream we're outputting to.  */
  94
  95   size_t lmargin, rmargin;      /* Left and right margins.  */
  96   ssize_t wmargin;              /* Margin to wrap to, or -1 to truncate.  */
  97
  98   /* Point in buffer to which we've processed for wrapping, but not output.  */
  99   size_t point_offs;
 100   /* Output column at POINT_OFFS, or -1 meaning 0 but don't add lmargin.  */
 101   ssize_t point_col;
 102
 103   char *buf;                    /* Output buffer.  */
 104   char *p;                      /* Current end of text in BUF. */
 105   char *end;                    /* Absolute end of BUF.  */
 106 };
 107
 108 typedef struct argp_fmtstream *argp_fmtstream_t;
 109
 110 /* Return an argp_fmtstream that outputs to STREAM, and which prefixes lines
 111    written on it with LMARGIN spaces and limits them to RMARGIN columns
 112    total.  If WMARGIN >= 0, words that extend past RMARGIN are wrapped by
 113    replacing the whitespace before them with a newline and WMARGIN spaces.
 114    Otherwise, chars beyond RMARGIN are simply dropped until a newline.
 115    Returns NULL if there was an error.  */
 116 extern argp_fmtstream_t __argp_make_fmtstream (FILE *__stream,
 117                                                size_t __lmargin,
 118                                                size_t __rmargin,
 119                                                ssize_t __wmargin);
 120 extern argp_fmtstream_t argp_make_fmtstream (FILE *__stream,
 121                                              size_t __lmargin,
 122                                              size_t __rmargin,
 123                                              ssize_t __wmargin);
 124
 125 /* Flush __FS to its stream, and free it (but don't close the stream).  */
 126 extern void __argp_fmtstream_free (argp_fmtstream_t __fs);
 127 extern void argp_fmtstream_free (argp_fmtstream_t __fs);
 128
 129 extern ssize_t __argp_fmtstream_printf (argp_fmtstream_t __fs,
 130                                         const char *__fmt, ...)
 131      _GL_ATTRIBUTE_FORMAT ((printf, 2, 3));
 132 extern ssize_t argp_fmtstream_printf (argp_fmtstream_t __fs,
 133                                       const char *__fmt, ...)
 134      _GL_ATTRIBUTE_FORMAT ((printf, 2, 3));
 135
 136 #if _LIBC || !defined __OPTIMIZE__
 137 extern int __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 138 extern int argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch);
 139
 140 extern int __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
 141 extern int argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str);
 142
 143 extern size_t __argp_fmtstream_write (argp_fmtstream_t __fs,
 144                                       const char *__str, size_t __len);
 145 extern size_t argp_fmtstream_write (argp_fmtstream_t __fs,
 146                                     const char *__str, size_t __len);
 147 #endif
 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 #if _LIBC || !defined __OPTIMIZE__
 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,
 160                                           size_t __lmargin);
 161 extern size_t __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs,
 162                                             size_t __lmargin);
 163
 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,
 166                                           size_t __rmargin);
 167 extern size_t __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs,
 168                                             size_t __rmargin);
 169
 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,
 172                                           size_t __wmargin);
 173 extern size_t __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs,
 174                                             size_t __wmargin);
 175
 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);
 179 #endif
 180
 181 /* Internal routines.  */
 182 extern void _argp_fmtstream_update (argp_fmtstream_t __fs);
 183 extern void __argp_fmtstream_update (argp_fmtstream_t __fs);
 184 extern int _argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 185 extern int __argp_fmtstream_ensure (argp_fmtstream_t __fs, size_t __amount);
 186 \f
 187 #ifdef __OPTIMIZE__
 188 /* Inline versions of above routines.  */
 189
 190 #if !_LIBC
 191 #define __argp_fmtstream_putc argp_fmtstream_putc
 192 #define __argp_fmtstream_puts argp_fmtstream_puts
 193 #define __argp_fmtstream_write argp_fmtstream_write
 194 #define __argp_fmtstream_set_lmargin argp_fmtstream_set_lmargin
 195 #define __argp_fmtstream_set_rmargin argp_fmtstream_set_rmargin
 196 #define __argp_fmtstream_set_wmargin argp_fmtstream_set_wmargin
 197 #define __argp_fmtstream_point argp_fmtstream_point
 198 #define __argp_fmtstream_update _argp_fmtstream_update
 199 #define __argp_fmtstream_ensure _argp_fmtstream_ensure
 200 #endif
 201
 202 #ifndef ARGP_FS_EI
 203 # ifdef __GNUC__
 204    /* GCC 4.3 and above with -std=c99 or -std=gnu99 implements ISO C99
 205       inline semantics, unless -fgnu89-inline is used.  It defines a macro
 206       __GNUC_STDC_INLINE__ to indicate this situation or a macro
 207       __GNUC_GNU_INLINE__ to indicate the opposite situation.
 208
 209       GCC 4.2 with -std=c99 or -std=gnu99 implements the GNU C inline
 210       semantics but warns, unless -fgnu89-inline is used:
 211         warning: C99 inline functions are not supported; using GNU89
 212         warning: to disable this warning use -fgnu89-inline or the gnu_inline function attribute
 213       It defines a macro __GNUC_GNU_INLINE__ to indicate this situation.
 214
 215       Whereas Apple GCC 4.0.1 build 5479 without -std=c99 or -std=gnu99
 216       implements the GNU C inline semantics and defines the macro
 217       __GNUC_GNU_INLINE__, but it does not warn and does not support
 218       __attribute__ ((__gnu_inline__)).
 219
 220       All in all, these are the possible combinations.  For every compiler,
 221       we need to choose ARGP_FS_EI so that the corresponding table cell
 222       contains an "ok".
 223
 224         \    ARGP_FS_EI                      inline   extern    extern
 225           \                                           inline    inline
 226       CC    \                                                   __attribute__
 227                                                                 ((gnu_inline))
 228
 229       gcc 4.3.0                              error    ok        ok
 230       gcc 4.3.0 -std=gnu99 -fgnu89-inline    error    ok        ok
 231       gcc 4.3.0 -std=gnu99                   ok       error     ok
 232
 233       gcc 4.2.2                              error    ok        ok
 234       gcc 4.2.2 -std=gnu99 -fgnu89-inline    error    ok        ok
 235       gcc 4.2.2 -std=gnu99                   error    warning   ok
 236
 237       gcc 4.1.2                              error    ok        warning
 238       gcc 4.1.2 -std=gnu99                   error    ok        warning
 239
 240       Apple gcc 4.0.1                        error    ok        warning
 241       Apple gcc 4.0.1 -std=gnu99             ok       error     warning
 242     */
 243 #  if defined __GNUC_STDC_INLINE__
 244 #   define ARGP_FS_EI inline
 245 #  elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
 246 #   define ARGP_FS_EI extern inline __attribute__ ((__gnu_inline__))
 247 #  else
 248 #   define ARGP_FS_EI extern inline
 249 #  endif
 250 # else
 251    /* With other compilers, assume the ISO C99 meaning of 'inline', if
 252       the compiler supports 'inline' at all.  */
 253 #  define ARGP_FS_EI inline
 254 # endif
 255 #endif
 256
 257 ARGP_FS_EI size_t
 258 __argp_fmtstream_write (argp_fmtstream_t __fs,
 259                         const char *__str, size_t __len)
 260 {
 261   if (__fs->p + __len <= __fs->end || __argp_fmtstream_ensure (__fs, __len))
 262     {
 263       memcpy (__fs->p, __str, __len);
 264       __fs->p += __len;
 265       return __len;
 266     }
 267   else
 268     return 0;
 269 }
 270
 271 ARGP_FS_EI int
 272 __argp_fmtstream_puts (argp_fmtstream_t __fs, const char *__str)
 273 {
 274   size_t __len = strlen (__str);
 275   if (__len)
 276     {
 277       size_t __wrote = __argp_fmtstream_write (__fs, __str, __len);
 278       return __wrote == __len ? 0 : -1;
 279     }
 280   else
 281     return 0;
 282 }
 283
 284 ARGP_FS_EI int
 285 __argp_fmtstream_putc (argp_fmtstream_t __fs, int __ch)
 286 {
 287   if (__fs->p < __fs->end || __argp_fmtstream_ensure (__fs, 1))
 288     return *__fs->p++ = __ch;
 289   else
 290     return EOF;
 291 }
 292
 293 /* Set __FS's left margin to __LMARGIN and return the old value.  */
 294 ARGP_FS_EI size_t
 295 __argp_fmtstream_set_lmargin (argp_fmtstream_t __fs, size_t __lmargin)
 296 {
 297   size_t __old;
 298   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 299     __argp_fmtstream_update (__fs);
 300   __old = __fs->lmargin;
 301   __fs->lmargin = __lmargin;
 302   return __old;
 303 }
 304
 305 /* Set __FS's right margin to __RMARGIN and return the old value.  */
 306 ARGP_FS_EI size_t
 307 __argp_fmtstream_set_rmargin (argp_fmtstream_t __fs, size_t __rmargin)
 308 {
 309   size_t __old;
 310   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 311     __argp_fmtstream_update (__fs);
 312   __old = __fs->rmargin;
 313   __fs->rmargin = __rmargin;
 314   return __old;
 315 }
 316
 317 /* Set FS's wrap margin to __WMARGIN and return the old value.  */
 318 ARGP_FS_EI size_t
 319 __argp_fmtstream_set_wmargin (argp_fmtstream_t __fs, size_t __wmargin)
 320 {
 321   size_t __old;
 322   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 323     __argp_fmtstream_update (__fs);
 324   __old = __fs->wmargin;
 325   __fs->wmargin = __wmargin;
 326   return __old;
 327 }
 328
 329 /* Return the column number of the current output point in __FS.  */
 330 ARGP_FS_EI size_t
 331 __argp_fmtstream_point (argp_fmtstream_t __fs)
 332 {
 333   if ((size_t) (__fs->p - __fs->buf) > __fs->point_offs)
 334     __argp_fmtstream_update (__fs);
 335   return __fs->point_col >= 0 ? __fs->point_col : 0;
 336 }
 337
 338 #if !_LIBC
 339 #undef __argp_fmtstream_putc
 340 #undef __argp_fmtstream_puts
 341 #undef __argp_fmtstream_write
 342 #undef __argp_fmtstream_set_lmargin
 343 #undef __argp_fmtstream_set_rmargin
 344 #undef __argp_fmtstream_set_wmargin
 345 #undef __argp_fmtstream_point
 346 #undef __argp_fmtstream_update
 347 #undef __argp_fmtstream_ensure
 348 #endif
 349
 350 #endif /* __OPTIMIZE__ */
 351
 352 #endif /* ARGP_FMTSTREAM_USE_LINEWRAP */
 353
 354 #endif /* argp-fmtstream.h */