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sfhdr.h

#ifndef _SFHDR_H
#define _SFHDR_H  1
#ifndef _BLD_sfio
#define _BLD_sfio 1
#endif

/*    Internal definitions for sfio.
**    Written by Kiem-Phong Vo (07/16/90)
**    AT&T Labs
*/

#include    "FEATURE/sfio"
#include    "sfio_t.h"

/* avoid conflict with BSDI's SF_APPEND */
#undef SF_APPEND

/* file system info */
#if _PACKAGE_ast

#include    <ast.h>
#include    <ast_time.h>
#include    <ast_tty.h>
#include    <ls.h>

#if _mem_st_blksize_stat
#define _stat_blksize   1
#endif

#if _lib_localeconv && _hdr_locale
#define _lib_locale     1
#endif

#else /*!_PACKAGE_ast*/

#if __mips == 2 && !defined(_NO_LARGEFILE64_SOURCE)
#define _NO_LARGEFILE64_SOURCE  1
#endif
#if !defined(_NO_LARGEFILE64_SOURCE) && \
      _lib_lseek64 && _lib_stat64 && _lib_mmap64 && _typ_off64_t && _typ_struct_stat64
#     if !defined(_LARGEFILE64_SOURCE)
#     define _LARGEFILE64_SOURCE     1
#     endif
#else
#     undef  _LARGEFILE64_SOURCE
#endif

/* when building the binary compatibility package, a number of header files
   are not needed and they may get in the way so we remove them here.
*/
#if _SFBINARY_H
#undef  _hdr_time
#undef  _sys_time
#undef  _sys_stat
#undef  _hdr_stat
#undef  _hdr_filio
#undef  _sys_filio
#undef  _hdr_unistd
#undef  _lib_poll
#undef  _stream_peek
#undef  _socket_peek
#undef  _hdr_vfork
#undef  _sys_vfork
#undef  _lib_vfork
#undef  _hdr_floatingpoint
#undef  _hdr_float
#undef  _hdr_values
#undef  _hdr_math
#undef  _sys_mman
#undef  _hdr_mman
#undef  _sys_ioctl
#endif

#if _hdr_stdlib
#include    <stdlib.h>
#endif

#if _hdr_string
#include    <string.h>
#endif

#if _hdr_time
#include    <time.h>
#endif
#if _sys_time
#include    <sys/time.h>
#endif

#if _sys_stat
#include    <sys/stat.h>
#else
#if _hdr_stat
#include    <stat.h>
#ifndef _sys_stat
#define     _sys_stat   1
#endif
#endif
#endif /*_sys_stat*/

#ifndef _sys_stat
#define _sys_stat 0
#endif

#include    <fcntl.h>

#ifndef F_SETFD
#ifndef FIOCLEX
#if _hdr_filio
#include    <filio.h>
#else
#if _sys_filio
#include    <sys/filio.h>
#endif /*_sys_filio*/
#endif /*_hdr_filio*/
#endif /*_FIOCLEX*/
#endif /*F_SETFD*/

#if _hdr_unistd
#include    <unistd.h>
#endif

#endif /*_PACKAGE_ast*/

#include    <errno.h>
#include    <ctype.h>

#if _lib_select
#undef _lib_poll
#else
#if _lib_poll_fd_1 || _lib_poll_fd_2
#define _lib_poll 1
#endif
#endif /*_lib_select_*/

#if _lib_poll
#include    <poll.h>

#if _lib_poll_fd_1
#define SFPOLL(pfd,n,tm)      poll((pfd),(ulong)(n),(tm))
#else
#define SFPOLL(pfd,n,tm)      poll((ulong)(n),(pfd),(tm))
#endif
#endif /*_lib_poll*/

#if _stream_peek
#include    <stropts.h>
#endif

#if _socket_peek
# ifdef _AIX
#  undef SF_CLOSE
#  include  <sys/socket.h>
#  undef SF_CLOSE
/* From sfio.h, but must not be defined until after socket.h! */
#  define SF_CLOSE 4
# else /* !_AIX */
#  include  <sys/socket.h>
# endif
#endif

#ifndef X_OK      /* executable */
#define X_OK      01
#endif

#if _lib_vfork && !defined(sparc) && !defined(__sparc)
#if _hdr_vfork
#include    <vfork.h>
#endif
#if _sys_vfork
#include    <sys/vfork.h>
#endif
#define fork      vfork
#endif

#if _lib_unlink
#define remove    unlink
#endif

#if _hdr_math
#include    <math.h>
#ifdef MAXFLOAT   /* on BSDI, this is defined twice in machine/values.h and math.h */
#undef MAXFLOAT   /* we don't need it anyway, so we zap it to avoid compiler warnings */
#endif
#endif

#if !defined(MAXDOUBLE) && _hdr_values
#include    <values.h>
#endif

#if !defined(MAXDOUBLE) && _hdr_floatingpoint
#include    <floatingpoint.h>
#endif

#if !defined(MAXDOUBLE) && _hdr_float
#include    <float.h>
#endif

#if !_ast_fltmax_double
#if !defined(MAXDOUBLE) && defined(DBL_MAX)
#define MAXDOUBLE DBL_MAX
#endif
#if !defined(MAXDOUBLE)
#define MAXDOUBLE 1.79769313486231570e+308
#endif

#if _lib_qfrexp && _lib_qldexp
#define _has_expfuncs   1
#define frexp           qfrexp
#define ldexp           qldexp
#else
#define _has_expfuncs   0
#endif

#endif/*_ast_fltmax_double*/

/* 64-bit vs 32-bit file stuff */
#if _sys_stat
#ifdef _LARGEFILE64_SOURCE
typedef struct stat64   Stat_t;
#define     lseek       lseek64
#define stat            stat64
#define fstat           fstat64
#define off_t           off64_t
#else
typedef struct stat     Stat_t;
#endif
#endif

/* to get rid of pesky compiler warnings */
#if __STD_C
#define NOTUSED(x)      (void)(x)
#else
#define NOTUSED(x)      (&x,1)
#endif

/* Private flags */
#define SF_MMAP         00000001    /* in memory mapping mode           */
#define SF_PROCESS      00000002    /* this stream is sfpopen           */
#define SF_BOTH         00000004    /* both read/write                  */
#define SF_HOLE         00000010    /* a hole of zero's was created           */
#define SF_NULL         00000020    /* stream is /dev/null              */
#define SF_SEQUENTIAL   00000040    /* sequential access                */
#define SF_JUSTSEEK     00000100    /* just did a sfseek                */

/* private flags that must be cleared in sfclrlock */
#define SF_DCDOWN 00001000    /* recurse down the discipline stack      */
#define SF_MVSIZE 00002000
#define SFMVSET(f)      (((f)->size *= SF_NMAP), ((f)->bits |= SF_MVSIZE) )
#define SFMVUNSET(f)    (!((f)->bits&SF_MVSIZE) ? 0 : \
                        (((f)->bits &= ~SF_MVSIZE), ((f)->size /= SF_NMAP)) )
#define SFCLRBITS(f)    (SFMVUNSET(f), ((f)->bits &= ~(SF_DCDOWN|SF_MVSIZE)) )

/* bits for the mode field, SF_INIT defined in sfio_t.h */
#define SF_RC           00000010    /* peeking for a record             */
#define SF_RV           00000020    /* reserve without read or most write     */
#define SF_LOCK         00000040    /* stream is locked for io op       */
#define SF_PUSH         00000100    /* stream has been pushed           */
#define SF_POOL         00000200    /* stream is in a pool but not current    */
#define SF_PEEK         00000400    /* there is a pending peek          */
#define SF_PKRD         00001000    /* did a peek read                  */
#define SF_GETR         00002000    /* did a getr on this stream        */
#define SF_SYNCED 00004000    /* stream was synced                */
#define SF_STDIO  00010000    /* given up the buffer to stdio           */
#define SF_AVAIL  00020000    /* was closed, available for reuse  */
#define SF_LOCAL  00100000    /* sentinel for a local call        */

/* mode bits usable on the flags argument of sfnew() because they are >16-bit  */
#define SF_OPEN         00200000    /* just opened, ie, seek == 0       */

#ifdef DEBUG
#define ASSERT(p) ((p) ? 0 : (abort(),0) )
#else
#define ASSERT(p)
#endif

/* short-hands */
#define NIL(t)          ((t)0)
#define reg       register
#ifndef uchar
#define uchar           unsigned char
#endif
#ifndef ulong
#define ulong           unsigned long
#endif
#ifndef uint
#define uint            unsigned int
#endif
#ifndef ushort
#define ushort          unsigned short
#endif

#define SECOND          1000  /* millisecond units */

/* macros do determine stream types from Stat_t data */
#ifndef S_IFMT
#define S_IFMT    0
#endif
#ifndef S_IFDIR
#define S_IFDIR   0
#endif
#ifndef S_IFREG
#define S_IFREG   0
#endif
#ifndef S_IFCHR
#define S_IFCHR   0
#endif
#ifndef S_IFIFO
#define S_IFIFO   0
#endif

#ifndef S_ISDIR
#define S_ISDIR(m)      (((m)&S_IFMT) == S_IFDIR)
#endif
#ifndef S_ISREG
#define S_ISREG(m)      (((m)&S_IFMT) == S_IFREG)
#endif
#ifndef S_ISCHR
#define S_ISCHR(m)      (((m)&S_IFMT) == S_IFCHR)
#endif

#ifndef S_ISFIFO
#     ifdef S_IFIFO
#           define S_ISFIFO(m)      (((m)&S_IFIFO) == S_IFIFO)
#     else
#           define S_ISFIFO(m)      (0)
#     endif
#endif

#ifdef S_IRUSR
#define SF_CREATMODE    (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
#else
#define SF_CREATMODE    0666
#endif

/* set close-on-exec */
#ifdef F_SETFD
#     ifndef FD_CLOEXEC
#           define FD_CLOEXEC 1
#     endif /*FD_CLOEXEC*/
#     define SETCLOEXEC(fd)         ((void)fcntl((fd),F_SETFD,FD_CLOEXEC))
#else
#     ifdef FIOCLEX
#           define SETCLOEXEC(fd)   ((void)ioctl((fd),FIOCLEX,0))
#     else
#           define SETCLOEXEC(fd)
#     endif /*FIOCLEX*/
#endif /*F_SETFD*/

/* see if we can use memory mapping for io */
#if !_PACKAGE_ast && _mmap_worthy
#     ifdef _LARGEFILE64_SOURCE
#           undef mmap
#     endif
#     if _hdr_mman
#           include     <mman.h>
#     endif
#     if _sys_mman
#           include     <sys/mman.h>
#     endif
#     ifdef _LARGEFILE64_SOURCE
#           ifndef off_t
#                 define off_t            off64_t
#           endif
#           define mmap       mmap64
#     endif
#endif

/* function to get the decimal point for local environment */
#if _lib_locale
#include    <locale.h>
#define SFSETLOCALE(decimal,thousand) \
      { struct lconv*   lv; \
        if(*(decimal) == 0) \
        { *(decimal) = '.'; \
          if((lv = localeconv())) \
          { if(lv->decimal_point && lv->decimal_point[0]) \
            *(decimal) = lv->decimal_point[0]; \
            if(thousand && lv->thousands_sep && lv->thousands_sep[0]) \
            *(thousand) = lv->thousands_sep[0]; \
          } \
        } \
      }
#else
#define SFSETLOCALE(decimal,thousand)
#endif

/* stream pool structure. */
typedef struct _sfpool_s      Sfpool_t;
struct _sfpool_s
{     Sfpool_t*   next;
      int         mode;       /* type of pool               */
      int         s_sf;       /* size of pool array         */
      int         n_sf;       /* number currently in pool   */
      Sfio_t**    sf;         /* array of streams           */
      Sfio_t*           array[3];   /* start with 3               */
};

/* reserve buffer structure */
typedef struct _sfrsrv_s      Sfrsrv_t;
struct _sfrsrv_s
{     Sfrsrv_t*   next;       /* link list                  */
      Sfio_t*           sf;         /* stream associated with     */
      ssize_t           slen;       /* last string length         */
      ssize_t           size;       /* buffer size                */
      uchar       data[1];    /* data buffer                */
};

/* extensions to sfvprintf/sfvscanf */
#define FP_SET(fp,fn)   (fp < 0 ? (fn += 1) : (fn = fp) )
#define FP_WIDTH  0
#define FP_PRECIS 1
#define FP_BASE         2
#define FP_STR          3
#define FP_SIZE         4
#define FP_INDEX  5     /* index size     */

typedef struct _fmt_s         Fmt_t;
typedef struct _fmtpos_s      Fmtpos_t;
typedef union
{     int         i, *ip;
      long        l, *lp;
      short       h, *hp;
      uint        ui;
      ulong       ul;
      ushort            uh;
      Sflong_t    ll, *llp;
      Sfulong_t   lu;
      Sfdouble_t  ld;
      double            d;
      float       f;
      char        c, *s, **sp;
      Void_t            *vp;
      Sffmt_t           *ft;
} Argv_t;

struct _fmt_s
{     char*       form;       /* format string        */
      va_list           args;       /* corresponding arglist      */

      char*       oform;            /* original format string     */
      va_list           oargs;            /* original arg list          */
      int         argn;       /* number of args already used      */
      Fmtpos_t*   fp;         /* position list        */

      Sffmt_t*    ft;         /* formatting environment     */
      Sffmtevent_f      eventf;           /* event function       */
      Fmt_t*            next;       /* stack frame pointer        */
};

struct _fmtpos_s
{     Sffmt_t     ft;               /* environment                */
      Argv_t      argv;             /* argument value       */
      int   fmt;              /* original format            */
      int   need[FP_INDEX];         /* positions depending on     */
};

#define LEFTP           '('
#define RIGHTP          ')'
#define QUOTE           '\''

#ifndef CHAR_BIT
#define CHAR_BIT  8
#endif

#define FMTSET(ft, frm,ags, fv, sz, flgs, wid,pr,bs, ts,ns) \
      ((ft->form = (char*)frm), va_copy(ft->args,ags), \
       (ft->fmt = fv), (ft->size = sz), \
       (ft->flags = (flgs&SFFMT_SET)), \
       (ft->width = wid), (ft->precis = pr), (ft->base = bs), \
       (ft->t_str = ts), (ft->n_str = ns) )
#define FMTGET(ft, frm,ags, fv, sz, flgs, wid,pr,bs) \
      ((frm = ft->form), va_copy(ags,ft->args), (fv = ft->fmt), (sz = ft->size), \
       (flgs = (flgs&~(SFFMT_SET))|(ft->flags&SFFMT_SET)), \
       (wid = ft->width), (pr = ft->precis), (bs = ft->base) )
#define FMTCMP(sz, type, maxtype) \
      (sz == sizeof(type) || (sz == 0 && sizeof(type) == sizeof(maxtype)) || \
       (sz == 64 && sz == sizeof(type)*CHAR_BIT) )

/* format flags&types, must coexist with those in sfio.h */
#define SFFMT_FORBIDDEN 007777700   /* for sfio.h     */
#define SFFMT_INT 000000001   /* %d,%i    */
#define SFFMT_UINT      000000002   /* %u, etc. */
#define SFFMT_FLOAT     000000004   /* %f,e,g etc.    */
#define SFFMT_BYTE      000000010   /* %c       */
#define SFFMT_POINTER   000000020   /* %p, %n   */
#define SFFMT_CLASS     000000040   /* %[       */
#define SFFMT_GFORMAT   010000000   /* %g       */
#define SFFMT_EFORMAT   020000000   /* %e       */
#define SFFMT_MINUS     040000000   /* minus sign     */

#define SFFMT_TYPES     (SFFMT_SHORT|SFFMT_LONG|SFFMT_LLONG|SFFMT_LDOUBLE|SFFMT_IFLAG)

/* memory management for the Fmt_t structures */
#define FMTALLOC(f)     ((f = _Fmtfree) ? (_Fmtfree = NIL(Fmt_t*), f) : \
                        (f = (Fmt_t*)malloc(sizeof(Fmt_t))) )
#define FMTFREE(f)      (_Fmtfree = _Fmtfree ? (free((Void_t*)_Fmtfree),f) : f )

/* local variables used across sf-functions */
#define _Sfpage         (_Sfextern.sf_page)
#define _Sfpool         (_Sfextern.sf_pool)
#define _Sffree         (_Sfextern.sf_free)
#define _Fmtfree  (_Sfextern.fmt_free)
#define _Sfpmove  (_Sfextern.sf_pmove)
#define _Sfstack  (_Sfextern.sf_stack)
#define _Sfnotify (_Sfextern.sf_notify)
#define _Sfstdio  (_Sfextern.sf_stdio)
#define _Sfudisc  (&(_Sfextern.sf_udisc))
#define _Sfcleanup      (_Sfextern.sf_cleanup)
#define _Sfexiting      (_Sfextern.sf_exiting)
typedef struct _sfext_s
{     ssize_t                 sf_page;
      struct _sfpool_s  sf_pool;
      Sfio_t*                 sf_free;
      Fmt_t*                  fmt_free;
      int               (*sf_pmove)_ARG_((Sfio_t*, int));
      Sfio_t*                 (*sf_stack)_ARG_((Sfio_t*, Sfio_t*));
      void              (*sf_notify)_ARG_((Sfio_t*, int, int));
      int               (*sf_stdio)_ARG_((Sfio_t*));
      struct _sfdisc_s  sf_udisc;
      void              (*sf_cleanup)_ARG_((void));
      int               sf_exiting;
} Sfext_t;

/* function to clear an sfio structure */
#define SFCLEAR(f) \
      ((f)->next = (f)->endw = (f)->endr = (f)->endb = (f)->data = NIL(uchar*), \
       (f)->flags = 0, (f)->file = -1, \
       (f)->extent = (Sfoff_t)(-1), (f)->here = (Sfoff_t)0, \
       (f)->getr = 0, (f)->bits = 0, (f)->mode = 0, (f)->size = (ssize_t)(-1), \
       (f)->disc = NIL(Sfdisc_t*), (f)->pool = NIL(Sfpool_t*), \
       (f)->push = NIL(Sfio_t*) )

/* get the real value of a byte in a coded long or ulong */
#define SFUVALUE(v)     (((ulong)(v))&(SF_MORE-1))
#define SFSVALUE(v)     ((( long)(v))&(SF_SIGN-1))

/* amount of precision to get in each iteration during coding of doubles */
#define SF_PRECIS (SF_UBITS-1)

/* grain size for buffer increment */
#define SF_GRAIN  1024
#define SF_PAGE         ((ssize_t)(SF_GRAIN*sizeof(int)*2))

/* after a seek, we may limit buffer filling */
#define SFUNBUFFER(f,n) (n >= 4*SF_GRAIN && \
                   ((n%SF_GRAIN) == 0 || \
                    (ssize_t)n >= SF_PAGE-SF_GRAIN || \
                    (ssize_t)n >= f->size-SF_GRAIN ) )

/* number of pages to memory map at a time */
#define SF_NMAP         8

/* set/unset sequential states for mmap */
#if _lib_madvise && defined(MADV_SEQUENTIAL) && defined(MADV_NORMAL)
#define SFMMSEQON(f,a,s)      (void)(madvise((caddr_t)(a),(size_t)(s),MADV_SEQUENTIAL) )
#define SFMMSEQOFF(f,a,s)     (void)(madvise((caddr_t)(a),(size_t)(s),MADV_NORMAL) )
#else
#define SFMMSEQON(f,a,s)
#define SFMMSEQOFF(f,a,s)
#endif

#define SFMUNMAP(f,a,s)       (munmap((caddr_t)(a),(size_t)(s)), \
                         ((f)->endb = (f)->endr = (f)->endw = (f)->next = \
                          (f)->data = NIL(uchar*)) )

#ifndef MAP_VARIABLE
#define MAP_VARIABLE    0
#endif
#ifndef _mmap_fixed
#define _mmap_fixed     0
#endif

/* the bottomless bit bucket */
#define DEVNULL         "/dev/null"
#define SFSETNULL(f)    ((f)->extent = (Sfoff_t)(-1), (f)->bits |= SF_NULL)
#define SFISNULL(f)     ((f)->extent < 0 && ((f)->bits&SF_NULL) )

#define SFKILL(f) ((f)->mode = (SF_AVAIL|SF_LOCK) )
#define SFKILLED(f)     (((f)->mode&(SF_AVAIL|SF_LOCK)) == (SF_AVAIL|SF_LOCK) )

/* exception types */
#define SF_EDONE  0     /* stop this operation and return   */
#define SF_EDISC  1     /* discipline says it's ok          */
#define SF_ESTACK 2     /* stack was popped                 */
#define SF_ECONT  3     /* can continue normally            */

#define SETLOCAL(f)     ((f)->mode |= SF_LOCAL)
#define GETLOCAL(f,v)   ((v) = ((f)->mode&SF_LOCAL), (f)->mode &= ~SF_LOCAL, (v))
#define SFWRALL(f)      ((f)->mode |= SF_RV)
#define SFISALL(f,v)    ((((v) = (f)->mode&SF_RV) ? ((f)->mode &= ~SF_RV) : 0), \
                   ((v) || (f)->extent < 0 || \
                    ((f)->flags&(SF_SHARE|SF_APPENDWR|SF_WHOLE)) ) )
#define SFSK(f,a,o,d)   (SETLOCAL(f),sfsk(f,(Sfoff_t)a,o,d))
#define SFRD(f,b,n,d)   (SETLOCAL(f),sfrd(f,(Void_t*)b,n,d))
#define SFWR(f,b,n,d)   (SETLOCAL(f),sfwr(f,(Void_t*)b,n,d))
#define SFSYNC(f) (SETLOCAL(f),sfsync(f))
#define SFCLOSE(f)      (SETLOCAL(f),sfclose(f))
#define SFFLSBUF(f,n)   (SETLOCAL(f),_sfflsbuf(f,n))
#define SFFILBUF(f,n)   (SETLOCAL(f),_sffilbuf(f,n))
#define SFSETBUF(f,s,n) (SETLOCAL(f),sfsetbuf(f,s,n))
#define SFWRITE(f,s,n)  (SETLOCAL(f),sfwrite(f,s,n))
#define SFREAD(f,s,n)   (SETLOCAL(f),sfread(f,s,n))
#define SFSEEK(f,p,t)   (SETLOCAL(f),sfseek(f,p,t))
#define SFNPUTC(f,c,n)  (SETLOCAL(f),sfnputc(f,c,n))
#define SFRAISE(f,e,d)  (SETLOCAL(f),sfraise(f,e,d))

/* lock/open a stream */
#define SFMODE(f,l)     ((f)->mode & ~(SF_RV|SF_RC|((l) ? SF_LOCK : 0)) )
#define SFLOCK(f,l)     (void)((f)->mode |= SF_LOCK, (f)->endr = (f)->endw = (f)->data)
#define _SFOPEN(f)      ((f)->endr=((f)->mode == SF_READ) ? (f)->endb : (f)->data, \
                   (f)->endw=(((f)->mode == SF_WRITE) && !((f)->flags&SF_LINE)) ? \
                              (f)->endb : (f)->data )
#define SFOPEN(f,l)     (void)((l) ? 0 : \
                        ((f)->mode &= ~(SF_LOCK|SF_RC|SF_RV), _SFOPEN(f), 0) )

/* check to see if the stream can be accessed */
#define SFFROZEN(f)     ((f)->mode&(SF_PUSH|SF_LOCK|SF_PEEK) ? 1 : \
                   ((f)->mode&SF_STDIO) ? (*_Sfstdio)(f) : 0)


/* set discipline code */
#define SFDISC(f,dc,iof) \
      {     Sfdisc_t* d; \
            if(!(dc)) \
                  d = (dc) = (f)->disc; \
            else  d = (f->bits&SF_DCDOWN) ? ((dc) = (dc)->disc) : (dc); \
            while(d && !(d->iof))   d = d->disc; \
            if(d) (dc) = d; \
      }
#define SFDCRD(f,buf,n,dc,rv) \
            (((f)->bits |= SF_DCDOWN), \
             ((rv) = (*((dc)->readf))((f),(buf),(n),(dc)) ), \
             ((f)->bits &= ~SF_DCDOWN), (rv) )
#define SFDCWR(f,buf,n,dc,rv) \
            (((f)->bits |= SF_DCDOWN), \
             ((rv) = (*((dc)->writef))((f),(buf),(n),(dc)) ), \
             ((f)->bits &= ~SF_DCDOWN), (rv) )
#define SFDCSK(f,addr,type,dc,rv) \
            (((f)->bits |= SF_DCDOWN), \
             ((rv) = (*((dc)->seekf))((f),(addr),(type),(dc)) ), \
             ((f)->bits &= ~SF_DCDOWN), (rv) )

/* fast peek of a stream */
#define _SFAVAIL(f,s,n) ((n) = (f)->endb - ((s) = (f)->next) )
#define SFRPEEK(f,s,n)  (_SFAVAIL(f,s,n) > 0 ? (n) : \
                        ((n) = SFFILBUF(f,-1), (s) = (f)->next, (n)) )
#define SFWPEEK(f,s,n)  (_SFAVAIL(f,s,n) > 0 ? (n) : \
                        ((n) = SFFLSBUF(f,-1), (s) = (f)->next, (n)) )

/* malloc and free of streams */
#define SFFREE(f) ((_Sffree ? (free((Void_t*)_Sffree),0) : 0), _Sffree = f)
#define SFALLOC(f)      ((f = _Sffree) ? (_Sffree = NIL(Sfio_t*), f) : \
                           (f = (Sfio_t*)malloc(sizeof(Sfio_t))))

/* more than this for a line buffer, we might as well flush */
#define HIFORLINE 128

/* safe closing function */
#define CLOSE(f)  { while(close(f) < 0 && errno == EINTR) errno = 0; }

/* string stream extent */
#define SFSTRSIZE(f)    { reg Sfoff_t s = (f)->next - (f)->data; \
                    if(s > (f)->here) \
                      { (f)->here = s; if(s > (f)->extent) (f)->extent = s; } \
                  }

/* control flags for open() */
#ifdef O_CREAT
#define _has_oflags     1
#else /* for example, research UNIX */
#define _has_oflags     0
#define O_CREAT         004
#define O_TRUNC         010
#define O_APPEND  020
#define O_EXCL          040

#ifndef O_RDONLY
#define     O_RDONLY    000
#endif
#ifndef O_WRONLY
#define O_WRONLY  001
#endif
#ifndef O_RDWR
#define O_RDWR          002
#endif
#endif /*O_CREAT*/

#ifndef O_BINARY
#define O_BINARY  000
#endif
#ifndef O_TEXT
#define O_TEXT          000
#endif
#ifndef O_TEMPORARY
#define O_TEMPORARY     000
#endif

#define     SF_RADIX    64    /* maximum integer conversion base */

#if _PACKAGE_ast
#define SF_MAXINT INT_MAX
#define SF_MAXLONG      LONG_MAX
#else
#define SF_MAXINT ((int)(((uint)~0) >> 1))
#define SF_MAXLONG      ((long)(((ulong)~0L) >> 1))
#endif

#define SF_MAXCHAR      ((uchar)(~0))

/* floating point to ascii conversion */
#define SF_MAXEXP10     6
#define SF_MAXPOW10     (1 << SF_MAXEXP10)
#if !_ast_fltmax_double
#define SF_FDIGITS      1024        /* max allowed fractional digits */
#define SF_IDIGITS      (8*1024)    /* max number of digits in int part */
#else
#define SF_FDIGITS      256         /* max allowed fractional digits */
#define SF_IDIGITS      1024        /* max number of digits in int part */
#endif
#define SF_MAXDIGITS    (((SF_FDIGITS+SF_IDIGITS)/sizeof(int) + 1)*sizeof(int))

/* tables for numerical translation */
#define _Sfpos10  (_Sftable.sf_pos10)
#define _Sfneg10  (_Sftable.sf_neg10)
#define _Sfdec          (_Sftable.sf_dec)
#define _Sfdigits (_Sftable.sf_digits)
#define _Sfcvinitf      (_Sftable.sf_cvinitf)
#define _Sfcvinit (_Sftable.sf_cvinit)
#define _Sffmtposf      (_Sftable.sf_fmtposf)
#define _Sffmtintf      (_Sftable.sf_fmtintf)
#define _Sfcv36         (_Sftable.sf_cv36)
#define _Sfcv64         (_Sftable.sf_cv64)
#define _Sftype         (_Sftable.sf_type)
typedef struct _sftab_
{     Sfdouble_t  sf_pos10[SF_MAXEXP10];  /* positive powers of 10      */
      Sfdouble_t  sf_neg10[SF_MAXEXP10];  /* negative powers of 10      */
      uchar       sf_dec[200];            /* ascii reps of values < 100 */
      char*       sf_digits;        /* digits for general bases   */ 
      int         (*sf_cvinitf)();  /* initialization function    */
      int         sf_cvinit;        /* initialization state       */
      Fmtpos_t*   (*sf_fmtposf)_ARG_((Sfio_t*,const char*,va_list,int));
      char*       (*sf_fmtintf)_ARG_((const char*,int*));
      uchar       sf_cv36[SF_MAXCHAR+1];  /* conversion for base [2-36] */
      uchar       sf_cv64[SF_MAXCHAR+1];  /* conversion for base [37-64]      */
      uchar       sf_type[SF_MAXCHAR+1];  /* conversion formats&types   */
} Sftab_t;

/* thread-safe macro/function to initialize _Sfcv* conversion tables */
#define SFCVINIT()      (_Sfcvinit ? 1 : (_Sfcvinit = (*_Sfcvinitf)()) )

/* sfucvt() converts decimal integers to ASCII */
#define SFDIGIT(v,scale,digit) \
      { if(v < 5*scale) \
            if(v < 2*scale) \
                  if(v < 1*scale) \
                        { digit = '0'; } \
                  else  { digit = '1'; v -= 1*scale; } \
            else  if(v < 3*scale) \
                        { digit = '2'; v -= 2*scale; } \
                  else if(v < 4*scale) \
                        { digit = '3'; v -= 3*scale; } \
                  else  { digit = '4'; v -= 4*scale; } \
        else      if(v < 7*scale) \
                  if(v < 6*scale) \
                        { digit = '5'; v -= 5*scale; } \
                  else  { digit = '6'; v -= 6*scale; } \
            else  if(v < 8*scale) \
                        { digit = '7'; v -= 7*scale; } \
                  else if(v < 9*scale) \
                        { digit = '8'; v -= 8*scale; } \
                  else  { digit = '9'; v -= 9*scale; } \
      }
#define sfucvt(v,s,n,list,type,utype) \
      { while((utype)v >= 10000) \
        {   n = v; v = (type)(((utype)v)/10000); \
            n = (type)((utype)n - ((utype)v)*10000); \
            s -= 4; SFDIGIT(n,1000,s[0]); SFDIGIT(n,100,s[1]); \
                  s[2] = *(list = (char*)_Sfdec + (n <<= 1)); s[3] = *(list+1); \
        } \
        if(v < 100) \
        { if(v < 10) \
          {       s -= 1; s[0] = (char)('0'+v); \
          } else \
          {       s -= 2; s[0] = *(list = (char*)_Sfdec + (v <<= 1)); s[1] = *(list+1); \
          } \
        } else \
        { if(v < 1000) \
          {       s -= 3; SFDIGIT(v,100,s[0]); \
                  s[1] = *(list = (char*)_Sfdec + (v <<= 1)); s[2] = *(list+1); \
          } else \
          { s -= 4; SFDIGIT(v,1000,s[0]); SFDIGIT(v,100,s[1]); \
                  s[2] = *(list = (char*)_Sfdec + (v <<= 1)); s[3] = *(list+1); \
          } \
        } \
      }

/* handy functions */
#undef min
#undef max
#define min(x,y)  ((x) < (y) ? (x) : (y))
#define max(x,y)  ((x) > (y) ? (x) : (y))

/* fast functions for memory copy and memory clear */
#if _PACKAGE_ast
#define memclear(s,n)   memzero(s,n)
#else
#if _lib_bcopy && !_lib_memcpy
#define memcpy(to,fr,n) bcopy((fr),(to),(n))
#endif
#if _lib_bzero && !_lib_memset
#define memclear(s,n)   bzero((s),(n))
#else
#define memclear(s,n)   memset((s),'\0',(n))
#endif
#endif /*_PACKAGE_ast*/

/* note that MEMCPY advances the associated pointers */
#define MEMCPY(to,fr,n) \
      switch(n) \
      { default : memcpy((Void_t*)to,(Void_t*)fr,n); to += n; fr += n; break; \
        case  7 : *to++ = *fr++; \
        case  6 : *to++ = *fr++; \
        case  5 : *to++ = *fr++; \
        case  4 : *to++ = *fr++; \
        case  3 : *to++ = *fr++; \
        case  2 : *to++ = *fr++; \
        case  1 : *to++ = *fr++; \
      }
#define MEMSET(s,c,n) \
      switch(n) \
      { default : memset((Void_t*)s,(int)c,n); s += n; break; \
        case  7 : *s++ = c; \
        case  6 : *s++ = c; \
        case  5 : *s++ = c; \
        case  4 : *s++ = c; \
        case  3 : *s++ = c; \
        case  2 : *s++ = c; \
        case  1 : *s++ = c; \
      }

_BEGIN_EXTERNS_

extern Sfext_t          _Sfextern;
extern Sftab_t          _Sftable;

extern int        _sfpopen _ARG_((Sfio_t*, int, int));
extern int        _sfpclose _ARG_((Sfio_t*));
extern int        _sfmode _ARG_((Sfio_t*, int, int));
extern int        _sftype _ARG_((const char*, int*));
extern int        _sfexcept _ARG_((Sfio_t*, int, ssize_t, Sfdisc_t*));
extern Sfrsrv_t*  _sfrsrv _ARG_((Sfio_t*, ssize_t));
extern int        _sfsetpool _ARG_((Sfio_t*));
extern void       _sfswap _ARG_((Sfio_t*, Sfio_t*, int));
extern char*            _sfcvt _ARG_((Void_t*, int, int*, int*, int));
extern char**           _sfgetpath _ARG_((char*));
extern Sfdouble_t _sfstrtod _ARG_((const char*, char**));

#if !_lib_strtod
#define strtod          _sfstrtod
#endif

#ifndef errno
_astimport int          errno;
#endif

/* for portable encoding of double values */
#if !__STDC__
extern double     frexp _ARG_((double, int*));
extern double     ldexp _ARG_((double,int));
#endif

#if !_hdr_mman && !_sys_mman
extern Void_t*    mmap _ARG_((Void_t*, size_t, int, int, int, off_t));
extern int  munmap _ARG_((Void_t*, size_t));
#endif

#if !_PACKAGE_ast

#if !__STDC__ && !_hdr_stdlib
extern void abort _ARG_((void));
extern int  atexit _ARG_((void(*)(void)));
extern char*      getenv _ARG_((const char*));
extern void*      malloc _ARG_((size_t));
extern void*      realloc _ARG_((void*, size_t));
extern void free _ARG_((void*));
#ifndef strlen
extern size_t     strlen _ARG_((const char*));
#endif
#ifndef strcpy
extern char*      strcpy _ARG_((char*, const char*));
#endif
#ifndef memset
extern Void_t*    memset _ARG_((void*, int, size_t));
#endif
#ifndef memchr
extern Void_t*    memchr _ARG_((const void*, int, size_t));
#endif
#ifndef memccpy
extern Void_t*    memccpy _ARG_((void*, const void*, int, size_t));
#endif
#ifndef memcpy
extern Void_t*    memcpy _ARG_((void*, const void*, size_t));
#endif
#if !defined(strtod)
extern double     strtod _ARG_((const char*, char**));
#endif
#if !defined(remove)
extern int  remove _ARG_((const char*));
#endif
#endif /* !__STDC__ && !_hdr_stdlib */

#if !_hdr_unistd
extern int  close _ARG_((int));
extern ssize_t    read _ARG_((int, void*, size_t));
extern ssize_t    write _ARG_((int, const void*, size_t));
extern off_t      lseek _ARG_((int, off_t, int));
extern int  dup _ARG_((int));
extern int  isatty _ARG_((int));
extern int  wait _ARG_((int*));
extern int  pipe _ARG_((int*));
extern int  access _ARG_((const char*, int));
extern uint sleep _ARG_((uint));
#ifndef execl
extern int  execl _ARG_((const char*, const char*,...));
#endif
#ifndef execv
extern int  execv _ARG_((const char*, char**));
#endif
#if !defined(fork)
extern int  fork _ARG_((void));
#endif
#if _lib_unlink
extern int  unlink _ARG_((const char*));
#endif

#endif /*_hdr_unistd*/

#if _lib_bcopy && !_proto_bcopy
extern void bcopy _ARG_((const void*, void*, size_t));
#endif
#if _lib_bzero && !_proto_bzero
extern void bzero _ARG_((void*, size_t));
#endif

extern time_t     time _ARG_((time_t*));
extern int  waitpid _ARG_((int,int*,int));
extern void _exit _ARG_((int));
typedef int(*     Onexit_f)_ARG_((void));
extern Onexit_f   onexit _ARG_((Onexit_f));

#if _sys_stat
extern int  fstat _ARG_((int, Stat_t*));
#endif

#if _lib_vfork && !_hdr_vfork && !_sys_vfork
extern pid_t      vfork _ARG_((void));
#endif /*_lib_vfork*/

#if _lib_poll
#if _lib_poll_fd_1
extern int  poll _ARG_((struct pollfd*, ulong, int));
#else
extern int  poll _ARG_((ulong, struct pollfd*, int));
#endif
#endif /*_lib_poll*/

#if _proto_open && __cplusplus
extern int  open _ARG_((const char*, int, ...));
#endif

#endif /* _PACKAGE_ast */

_END_EXTERNS_

#endif /*_SFHDR_H*/

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