usr/src/lib/libast/i386/include/ast/sfio.h

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #ifndef _SFIO_H
  23 #define _SFIO_H 1
  24
  25 #define SFIO_VERSION    20080717L
  26
  27 /*      Public header file for the sfio library
  28 **
  29 **      Written by Kiem-Phong Vo
  30 */
  31
  32 typedef struct _sfio_s          Sfio_t;
  33 typedef struct _sfdisc_s        Sfdisc_t;
  34
  35 #if defined(_AST_STD_H) || defined(_PACKAGE_ast) && defined(_SFIO_PRIVATE)
  36 #include        <ast_std.h>
  37 #else
  38 #include        <ast_common.h>
  39 #endif /* _PACKAGE_ast */
  40
  41 /* Sfoff_t should be large enough for largest file address */
  42 #define Sfoff_t         intmax_t
  43 #define Sflong_t        intmax_t
  44 #define Sfulong_t       uintmax_t
  45 #define Sfdouble_t      _ast_fltmax_t
  46
  47 typedef ssize_t         (*Sfread_f)_ARG_((Sfio_t*, Void_t*, size_t, Sfdisc_t*));
  48 typedef ssize_t         (*Sfwrite_f)_ARG_((Sfio_t*, const Void_t*, size_t, Sfdisc_t*));
  49 typedef Sfoff_t         (*Sfseek_f)_ARG_((Sfio_t*, Sfoff_t, int, Sfdisc_t*));
  50 typedef int             (*Sfexcept_f)_ARG_((Sfio_t*, int, Void_t*, Sfdisc_t*));
  51 typedef int             (*Sfwalk_f)_ARG_((Sfio_t*, Void_t*));
  52
  53 /* discipline structure */
  54 struct _sfdisc_s
  55 {       Sfread_f        readf;          /* read function                */
  56         Sfwrite_f       writef;         /* write function               */
  57         Sfseek_f        seekf;          /* seek function                */
  58         Sfexcept_f      exceptf;        /* to handle exceptions         */
  59         Sfdisc_t*       disc;           /* the continuing discipline    */
  60 };
  61
  62 #include <sfio_s.h>
  63
  64 /* formatting environment */
  65 typedef struct _sffmt_s Sffmt_t;
  66 typedef int             (*Sffmtext_f)_ARG_((Sfio_t*, Void_t*, Sffmt_t*));
  67 typedef int             (*Sffmtevent_f)_ARG_((Sfio_t*, int, Void_t*, Sffmt_t*));
  68 struct _sffmt_s
  69 {       long            version;/* version of this structure            */
  70         Sffmtext_f      extf;   /* function to process arguments        */
  71         Sffmtevent_f    eventf; /* process events                       */
  72
  73         char*           form;   /* format string to stack               */
  74         va_list args;   /* corresponding arg list               */
  75
  76         int             fmt;    /* format character                     */
  77         ssize_t         size;   /* object size                          */
  78         int             flags;  /* formatting flags                     */
  79         int             width;  /* width of field                       */
  80         int             precis; /* precision required                   */
  81         int             base;   /* conversion base                      */
  82
  83         char*           t_str;  /* type string                          */
  84         ssize_t         n_str;  /* length of t_str                      */
  85
  86         Void_t*         mbs;    /* multibyte state for format string    */
  87
  88         Void_t*         none;   /* unused for now                       */
  89 };
  90 #define sffmtversion(fe,type) \
  91                 ((type) ? ((fe)->version = SFIO_VERSION) : (fe)->version)
  92
  93 #define SFFMT_SSHORT    000000010 /* 'hh' flag, char                    */
  94 #define SFFMT_TFLAG     000000020 /* 't' flag, ptrdiff_t                        */
  95 #define SFFMT_ZFLAG     000000040 /* 'z' flag, size_t                   */
  96
  97 #define SFFMT_LEFT      000000100 /* left-justification                 */
  98 #define SFFMT_SIGN      000000200 /* must have a sign                   */
  99 #define SFFMT_BLANK     000000400 /* if not signed, prepend a blank     */
 100 #define SFFMT_ZERO      000001000 /* zero-padding on the left           */
 101 #define SFFMT_ALTER     000002000 /* alternate formatting               */
 102 #define SFFMT_THOUSAND  000004000 /* thousand grouping                  */
 103 #define SFFMT_SKIP      000010000 /* skip assignment in scanf()         */
 104 #define SFFMT_SHORT     000020000 /* 'h' flag                           */
 105 #define SFFMT_LONG      000040000 /* 'l' flag                           */
 106 #define SFFMT_LLONG     000100000 /* 'll' flag                          */
 107 #define SFFMT_LDOUBLE   000200000 /* 'L' flag                           */
 108 #define SFFMT_VALUE     000400000 /* value is returned                  */
 109 #define SFFMT_ARGPOS    001000000 /* getting arg for $ patterns         */
 110 #define SFFMT_IFLAG     002000000 /* 'I' flag                           */
 111 #define SFFMT_JFLAG     004000000 /* 'j' flag, intmax_t                 */
 112 #define SFFMT_CENTER    010000000 /* '=' flag, center justification     */
 113 #define SFFMT_SET       017777770 /* flags settable on calling extf     */
 114
 115 /* for sfmutex() call */
 116 #define SFMTX_LOCK      0       /* up mutex count                       */
 117 #define SFMTX_TRYLOCK   1       /* try to up mutex count                */
 118 #define SFMTX_UNLOCK    2       /* down mutex count                     */
 119 #define SFMTX_CLRLOCK   3       /* clear mutex count                    */
 120
 121 /* various constants */
 122 #ifndef NULL
 123 #define NULL            0
 124 #endif
 125 #ifndef EOF
 126 #define EOF             (-1)
 127 #endif
 128 #ifndef SEEK_SET
 129 #define SEEK_SET        0
 130 #define SEEK_CUR        1
 131 #define SEEK_END        2
 132 #endif
 133
 134 /* bits for various types of files */
 135 #define SF_READ         0000001 /* open for reading                     */
 136 #define SF_WRITE        0000002 /* open for writing                     */
 137 #define SF_STRING       0000004 /* a string stream                      */
 138 #define SF_APPENDWR     0000010 /* file is in append mode only          */
 139 #define SF_MALLOC       0000020 /* buffer is malloc-ed                  */
 140 #define SF_LINE         0000040 /* line buffering                       */
 141 #define SF_SHARE        0000100 /* stream with shared file descriptor   */
 142 #define SF_EOF          0000200 /* eof was detected                     */
 143 #define SF_ERROR        0000400 /* an error happened                    */
 144 #define SF_STATIC       0001000 /* a stream that cannot be freed        */
 145 #define SF_IOCHECK      0002000 /* call exceptf before doing IO         */
 146 #define SF_PUBLIC       0004000 /* SF_SHARE and follow physical seek    */
 147 #define SF_MTSAFE       0010000 /* need thread safety                   */
 148 #define SF_WHOLE        0020000 /* preserve wholeness of sfwrite/sfputr */
 149 #define SF_IOINTR       0040000 /* return on interrupts                 */
 150 #define SF_WCWIDTH      0100000 /* wcwidth display stream               */
 151
 152 #define SF_FLAGS        0177177 /* PUBLIC FLAGS PASSABLE TO SFNEW()     */
 153 #define SF_SETS         0177163 /* flags passable to sfset()            */
 154
 155 #ifndef _SF_NO_OBSOLETE
 156 #define SF_BUFCONST     0400000 /* unused flag - for compatibility only */
 157 #endif
 158
 159 /* for sfgetr/sfreserve to hold a record */
 160 #define SF_LOCKR        0000010 /* lock record, stop access to stream   */
 161 #define SF_LASTR        0000020 /* get the last incomplete record       */
 162
 163 /* exception events: SF_NEW(0), SF_READ(1), SF_WRITE(2) and the below   */
 164 #define SF_SEEK         3       /* seek error                           */
 165 #define SF_CLOSING      4       /* when stream is about to be closed    */
 166 #define SF_DPUSH        5       /* when discipline is being pushed      */
 167 #define SF_DPOP         6       /* when discipline is being popped      */
 168 #define SF_DPOLL        7       /* see if stream is ready for I/O       */
 169 #define SF_DBUFFER      8       /* buffer not empty during push or pop  */
 170 #define SF_SYNC         9       /* announcing start/end synchronization */
 171 #define SF_PURGE        10      /* a sfpurge() call was issued          */
 172 #define SF_FINAL        11      /* closing is done except stream free   */
 173 #define SF_READY        12      /* a polled stream is ready             */
 174 #define SF_LOCKED       13      /* stream is in a locked state          */
 175 #define SF_ATEXIT       14      /* process is exiting                   */
 176 #define SF_EVENT        100     /* start of user-defined events         */
 177
 178 /* for stack and disciplines */
 179 #define SF_POPSTACK     ((Sfio_t*)0)    /* pop the stream stack         */
 180 #define SF_POPDISC      ((Sfdisc_t*)0)  /* pop the discipline stack     */
 181
 182 /* for the notify function and discipline exception */
 183 #define SF_NEW          0       /* new stream                           */
 184 #define SF_SETFD        (-1)    /* about to set the file descriptor     */
 185 #define SF_MTACCESS     (-2)    /* starting a multi-threaded stream     */
 186
 187 #define SF_BUFSIZE      8192    /* default buffer size                  */
 188 #define SF_UNBOUND      (-1)    /* unbounded buffer size                */
 189
 190 /* namespace incursion workarounds -- migrate to the new names */
 191 #if !_mac_SF_APPEND
 192 #define SF_APPEND       SF_APPENDWR     /* BSDI sys/stat.h              */
 193 #endif
 194 #if !_mac_SF_CLOSE
 195 #define SF_CLOSE        SF_CLOSING      /* AIX sys/socket.h             */
 196 #endif
 197
 198 _BEGIN_EXTERNS_
 199
 200 /* standard in/out/err streams */
 201
 202 #if _BLD_sfio && defined(__EXPORT__)
 203 #define extern          extern __EXPORT__
 204 #endif
 205 #if !_BLD_sfio && defined(__IMPORT__)
 206 #define extern          extern __IMPORT__
 207 #endif
 208
 209 extern ssize_t          _Sfi;
 210 extern ssize_t          _Sfmaxr;
 211
 212 extern Sfio_t*          sfstdin;
 213 extern Sfio_t*          sfstdout;
 214 extern Sfio_t*          sfstderr;
 215
 216 #if _UWIN
 217 #undef  extern
 218 #endif
 219
 220 extern Sfio_t           _Sfstdin;
 221 extern Sfio_t           _Sfstdout;
 222 extern Sfio_t           _Sfstderr;
 223
 224 #undef  extern
 225
 226 #if _BLD_sfio && defined(__EXPORT__)
 227 #define extern  __EXPORT__
 228 #endif
 229
 230 extern Sfio_t*          sfnew _ARG_((Sfio_t*, Void_t*, size_t, int, int));
 231 extern Sfio_t*          sfopen _ARG_((Sfio_t*, const char*, const char*));
 232 extern Sfio_t*          sfpopen _ARG_((Sfio_t*, const char*, const char*));
 233 extern Sfio_t*          sfstack _ARG_((Sfio_t*, Sfio_t*));
 234 extern Sfio_t*          sfswap _ARG_((Sfio_t*, Sfio_t*));
 235 extern Sfio_t*          sftmp _ARG_((size_t));
 236 extern int              sfwalk _ARG_((Sfwalk_f, Void_t*, int));
 237 extern int              sfpurge _ARG_((Sfio_t*));
 238 extern int              sfpoll _ARG_((Sfio_t**, int, int));
 239 extern Void_t*          sfreserve _ARG_((Sfio_t*, ssize_t, int));
 240 extern int              sfresize _ARG_((Sfio_t*, Sfoff_t));
 241 extern int              sfsync _ARG_((Sfio_t*));
 242 extern int              sfclrlock _ARG_((Sfio_t*));
 243 extern Void_t*          sfsetbuf _ARG_((Sfio_t*, Void_t*, size_t));
 244 extern Sfdisc_t*        sfdisc _ARG_((Sfio_t*,Sfdisc_t*));
 245 extern int              sfraise _ARG_((Sfio_t*, int, Void_t*));
 246 extern int              sfnotify _ARG_((void(*)(Sfio_t*, int, void*)));
 247 extern int              sfset _ARG_((Sfio_t*, int, int));
 248 extern int              sfsetfd _ARG_((Sfio_t*, int));
 249 extern Sfio_t*          sfpool _ARG_((Sfio_t*, Sfio_t*, int));
 250 extern ssize_t          sfread _ARG_((Sfio_t*, Void_t*, size_t));
 251 extern ssize_t          sfwrite _ARG_((Sfio_t*, const Void_t*, size_t));
 252 extern Sfoff_t          sfmove _ARG_((Sfio_t*, Sfio_t*, Sfoff_t, int));
 253 extern int              sfclose _ARG_((Sfio_t*));
 254 extern Sfoff_t          sftell _ARG_((Sfio_t*));
 255 extern Sfoff_t          sfseek _ARG_((Sfio_t*, Sfoff_t, int));
 256 extern ssize_t          sfputr _ARG_((Sfio_t*, const char*, int));
 257 extern char*            sfgetr _ARG_((Sfio_t*, int, int));
 258 extern ssize_t          sfnputc _ARG_((Sfio_t*, int, size_t));
 259 extern int              sfungetc _ARG_((Sfio_t*, int));
 260 extern int              sfprintf _ARG_((Sfio_t*, const char*, ...));
 261 extern char*            sfprints _ARG_((const char*, ...));
 262 extern ssize_t          sfsprintf _ARG_((char*, size_t, const char*, ...));
 263 extern ssize_t          sfvsprintf _ARG_((char*, size_t, const char*, va_list));
 264 extern int              sfvprintf _ARG_((Sfio_t*, const char*, va_list));
 265 extern int              sfscanf _ARG_((Sfio_t*, const char*, ...));
 266 extern int              sfsscanf _ARG_((const char*, const char*, ...));
 267 extern int              sfvsscanf _ARG_((const char*, const char*, va_list));
 268 extern int              sfvscanf _ARG_((Sfio_t*, const char*, va_list));
 269
 270 /* mutex locking for thread-safety */
 271 extern int              sfmutex _ARG_((Sfio_t*, int));
 272
 273 /* io functions with discipline continuation */
 274 extern ssize_t          sfrd _ARG_((Sfio_t*, Void_t*, size_t, Sfdisc_t*));
 275 extern ssize_t          sfwr _ARG_((Sfio_t*, const Void_t*, size_t, Sfdisc_t*));
 276 extern Sfoff_t          sfsk _ARG_((Sfio_t*, Sfoff_t, int, Sfdisc_t*));
 277 extern ssize_t          sfpkrd _ARG_((int, Void_t*, size_t, int, long, int));
 278
 279 /* portable handling of primitive types */
 280 extern int              sfdlen _ARG_((Sfdouble_t));
 281 extern int              sfllen _ARG_((Sflong_t));
 282 extern int              sfulen _ARG_((Sfulong_t));
 283
 284 extern int              sfputd _ARG_((Sfio_t*, Sfdouble_t));
 285 extern int              sfputl _ARG_((Sfio_t*, Sflong_t));
 286 extern int              sfputu _ARG_((Sfio_t*, Sfulong_t));
 287 extern int              sfputm _ARG_((Sfio_t*, Sfulong_t, Sfulong_t));
 288 extern int              sfputc _ARG_((Sfio_t*, int));
 289
 290 extern Sfdouble_t       sfgetd _ARG_((Sfio_t*));
 291 extern Sflong_t         sfgetl _ARG_((Sfio_t*));
 292 extern Sfulong_t        sfgetu _ARG_((Sfio_t*));
 293 extern Sfulong_t        sfgetm _ARG_((Sfio_t*, Sfulong_t));
 294 extern int              sfgetc _ARG_((Sfio_t*));
 295
 296 extern int              _sfputd _ARG_((Sfio_t*, Sfdouble_t));
 297 extern int              _sfputl _ARG_((Sfio_t*, Sflong_t));
 298 extern int              _sfputu _ARG_((Sfio_t*, Sfulong_t));
 299 extern int              _sfputm _ARG_((Sfio_t*, Sfulong_t, Sfulong_t));
 300 extern int              _sfflsbuf _ARG_((Sfio_t*, int));
 301
 302 extern int              _sffilbuf _ARG_((Sfio_t*, int));
 303
 304 extern int              _sfdlen _ARG_((Sfdouble_t));
 305 extern int              _sfllen _ARG_((Sflong_t));
 306 extern int              _sfulen _ARG_((Sfulong_t));
 307
 308 /* miscellaneous function analogues of fast in-line functions */
 309 extern Sfoff_t          sfsize _ARG_((Sfio_t*));
 310 extern int              sfclrerr _ARG_((Sfio_t*));
 311 extern int              sfeof _ARG_((Sfio_t*));
 312 extern int              sferror _ARG_((Sfio_t*));
 313 extern int              sffileno _ARG_((Sfio_t*));
 314 extern int              sfstacked _ARG_((Sfio_t*));
 315 extern ssize_t          sfvalue _ARG_((Sfio_t*));
 316 extern ssize_t          sfslen _ARG_((void));
 317 extern ssize_t          sfmaxr _ARG_((ssize_t, int));
 318
 319 #undef extern
 320 _END_EXTERNS_
 321
 322 /* coding long integers in a portable and compact fashion */
 323 #define SF_SBITS        6
 324 #define SF_UBITS        7
 325 #define SF_BBITS        8
 326 #define SF_SIGN         (1 << SF_SBITS)
 327 #define SF_MORE         (1 << SF_UBITS)
 328 #define SF_BYTE         (1 << SF_BBITS)
 329 #define SF_U1           SF_MORE
 330 #define SF_U2           (SF_U1*SF_U1)
 331 #define SF_U3           (SF_U2*SF_U1)
 332 #define SF_U4           (SF_U3*SF_U1)
 333
 334 #if __cplusplus
 335 #define _SF_(f)         (f)
 336 #else
 337 #define _SF_(f)         ((Sfio_t*)(f))
 338 #endif
 339
 340 #define __sf_putd(f,v)          (_sfputd(_SF_(f),(Sfdouble_t)(v)))
 341 #define __sf_putl(f,v)          (_sfputl(_SF_(f),(Sflong_t)(v)))
 342 #define __sf_putu(f,v)          (_sfputu(_SF_(f),(Sfulong_t)(v)))
 343 #define __sf_putm(f,v,m)        (_sfputm(_SF_(f),(Sfulong_t)(v),(Sfulong_t)(m)))
 344
 345 #define __sf_putc(f,c)  (_SF_(f)->_next >= _SF_(f)->_endw ? \
 346                          _sfflsbuf(_SF_(f),(int)((unsigned char)(c))) : \
 347                          (int)(*_SF_(f)->_next++ = (unsigned char)(c)) )
 348 #define __sf_getc(f)    (_SF_(f)->_next >= _SF_(f)->_endr ? _sffilbuf(_SF_(f),0) : \
 349                          (int)(*_SF_(f)->_next++) )
 350
 351 #define __sf_dlen(v)    (_sfdlen((Sfdouble_t)(v)) )
 352 #define __sf_llen(v)    (_sfllen((Sflong_t)(v)) )
 353 #define __sf_ulen(v)    ((Sfulong_t)(v) < SF_U1 ? 1 : (Sfulong_t)(v) < SF_U2 ? 2 : \
 354                          (Sfulong_t)(v) < SF_U3 ? 3 : (Sfulong_t)(v) < SF_U4 ? 4 : 5)
 355
 356 #define __sf_fileno(f)  (_SF_(f)->_file)
 357 #define __sf_eof(f)     (_SF_(f)->_flags&SF_EOF)
 358 #define __sf_error(f)   (_SF_(f)->_flags&SF_ERROR)
 359 #define __sf_clrerr(f)  (_SF_(f)->_flags &= ~(SF_ERROR|SF_EOF))
 360 #define __sf_stacked(f) (_SF_(f)->_push != (Sfio_t*)0)
 361 #define __sf_value(f)   (_SF_(f)->_val)
 362 #define __sf_slen()     (_Sfi)
 363 #define __sf_maxr(n,s)  ((s)?((_Sfi=_Sfmaxr),(_Sfmaxr=(n)),_Sfi):_Sfmaxr)
 364
 365 #if defined(__INLINE__) && !_BLD_sfio
 366
 367 __INLINE__ int sfputd(Sfio_t* f, Sfdouble_t v)  { return __sf_putd(f,v); }
 368 __INLINE__ int sfputl(Sfio_t* f, Sflong_t v)    { return __sf_putl(f,v); }
 369 __INLINE__ int sfputu(Sfio_t* f, Sfulong_t v)   { return __sf_putu(f,v); }
 370 __INLINE__ int sfputm(Sfio_t* f, Sfulong_t v, Sfulong_t m)
 371                                                 { return __sf_putm(f,v,m); }
 372
 373 __INLINE__ int sfputc(Sfio_t* f, int c)         { return __sf_putc(f,c); }
 374 __INLINE__ int sfgetc(Sfio_t* f)                { return __sf_getc(f); }
 375
 376 __INLINE__ int sfdlen(Sfdouble_t v)             { return __sf_dlen(v); }
 377 __INLINE__ int sfllen(Sflong_t v)               { return __sf_llen(v); }
 378 __INLINE__ int sfulen(Sfulong_t v)              { return __sf_ulen(v); }
 379
 380 __INLINE__ int sffileno(Sfio_t* f)              { return __sf_fileno(f); }
 381 __INLINE__ int sfeof(Sfio_t* f)                 { return __sf_eof(f); }
 382 __INLINE__ int sferror(Sfio_t* f)               { return __sf_error(f); }
 383 __INLINE__ int sfclrerr(Sfio_t* f)              { return __sf_clrerr(f); }
 384 __INLINE__ int sfstacked(Sfio_t* f)             { return __sf_stacked(f); }
 385 __INLINE__ ssize_t sfvalue(Sfio_t* f)           { return __sf_value(f); }
 386 __INLINE__ ssize_t sfslen()                     { return __sf_slen(); }
 387 __INLINE__ ssize_t sfmaxr(ssize_t n, int s)     { return __sf_maxr(n,s); }
 388
 389 #else
 390
 391 #define sfputd(f,v)                             ( __sf_putd((f),(v)) )
 392 #define sfputl(f,v)                             ( __sf_putl((f),(v)) )
 393 #define sfputu(f,v)                             ( __sf_putu((f),(v)) )
 394 #define sfputm(f,v,m)                           ( __sf_putm((f),(v),(m)) )
 395
 396 #define sfputc(f,c)                             ( __sf_putc((f),(c)) )
 397 #define sfgetc(f)                               ( __sf_getc(f) )
 398
 399 #define sfdlen(v)                               ( __sf_dlen(v) )
 400 #define sfllen(v)                               ( __sf_llen(v) )
 401 #define sfulen(v)                               ( __sf_ulen(v) )
 402
 403 #define sffileno(f)                             ( __sf_fileno(f) )
 404 #define sfeof(f)                                ( __sf_eof(f) )
 405 #define sferror(f)                              ( __sf_error(f) )
 406 #define sfclrerr(f)                             ( __sf_clrerr(f) )
 407 #define sfstacked(f)                            ( __sf_stacked(f) )
 408 #define sfvalue(f)                              ( __sf_value(f) )
 409 #define sfslen()                                ( __sf_slen() )
 410 #define sfmaxr(n,s)                             ( __sf_maxr(n,s) )
 411
 412 #endif /*__INLINE__*/
 413
 414 #ifndef _SFSTR_H /* GSF's string manipulation stuff */
 415 #define _SFSTR_H                1
 416
 417 #define sfstropen()             sfnew(0, 0, -1, -1, SF_READ|SF_WRITE|SF_STRING)
 418 #define sfstrclose(f)           sfclose(f)
 419
 420 #define sfstrseek(f,p,m) \
 421         ( (m) == SEEK_SET ? \
 422                 (((p) < 0 || (p) > (f)->_size) ? (char*)0 : \
 423                  (char*)((f)->_next = (f)->_data+(p)) ) \
 424         : (m) == SEEK_CUR ? \
 425                 ((f)->_next += (p), \
 426                  (((f)->_next < (f)->_data || (f)->_next > (f)->_data+(f)->_size) ? \
 427                         ((f)->_next -= (p), (char*)0) : (char*)(f)->_next ) ) \
 428         : (m) == SEEK_END ? \
 429                 ( ((p) > 0 || (f)->_size+(p) < 0) ? (char*)0 : \
 430                         (char*)((f)->_next = (f)->_data+(f)->_size+(p)) ) \
 431         : (char*)0 \
 432         )
 433
 434 #define sfstrsize(f)            ((f)->_size)
 435 #define sfstrtell(f)            ((f)->_next - (f)->_data)
 436 #define sfstrpend(f)            ((f)->_size - sfstrtell())
 437 #define sfstrbase(f)            ((char*)(f)->_data)
 438
 439 #define sfstruse(f) \
 440         (sfputc((f),0) < 0 ? (char*)0 : (char*)((f)->_next = (f)->_data) \
 441         )
 442
 443 #define sfstrrsrv(f,n) \
 444         (sfreserve((f),(n),SF_WRITE|SF_LOCKR), sfwrite((f),(f)->_next,0), \
 445          ((f)->_next+(n) <= (f)->_data+(f)->_size ? (char*)(f)->_next : (char*)0) \
 446         )
 447
 448 #define sfstrbuf(f,b,n,m) \
 449         (sfsetbuf((f),(b),(n)), ((f)->_flags |= (m) ? SF_MALLOC : 0), \
 450          ((f)->_data == (unsigned char*)(b) ? 0 : -1) \
 451         )
 452
 453 #endif /* _SFSTR_H */
 454
 455 #endif /* _SFIO_H */