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fgets.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include "stdhdr.h"

extern char*
_stdgets(Sfio_t* f, char* us, int n, int isgets)
{
      int         p;
      unsigned char*    is;
      unsigned char*    ps;

      if(n <= 0 || !us || (f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0))
            return NIL(char*);

      SFLOCK(f,0);

      n -= 1;
      is = (uchar*)us;
      
      while(n)
      {     /* peek the read buffer for data */
            if((p = f->endb - (ps = f->next)) <= 0 )
            {     f->getr = '\n';
                  f->mode |= SF_RC;
                  if(SFRPEEK(f,ps,p) <= 0)
                        break;
            }

            if(p > n)
                  p = n;

#if _lib_memccpy
            if((ps = (uchar*)memccpy((char*)is,(char*)ps,'\n',p)) != NIL(uchar*))
                  p = ps-is;
            is += p;
            ps  = f->next+p;
#else
            if(!(f->flags&(SF_BOTH|SF_MALLOC)))
            {     while(p-- && (*is++ = *ps++) != '\n')
                        ;
                  p = ps-f->next;
            }
            else
            {     reg int     c = ps[p-1];
                  if(c != '\n')
                        ps[p-1] = '\n';
                  while((*is++ = *ps++) != '\n')
                        ;
                  if(c != '\n')
                  {     f->next[p-1] = c;
                        if((ps-f->next) >= p)
                              is[-1] = c;
                  }
            }
#endif

            /* gobble up read data and continue */
            f->next = ps;
            if(is[-1] == '\n')
                  break;
            else if(n > 0)
                  n -= p;
      }

      if((_Sfi = is - ((uchar*)us)) <= 0)
            us = NIL(char*);
      else if(isgets && is[-1] == '\n')
      {     is[-1] = '\0';
            _Sfi -= 1;
      }
      else  *is = '\0';

      SFOPEN(f,0);
      return us;
}

char*
fgets(char* s, int n, Sfio_t* f)
{
      STDIO_PTR(f, "fgets", char*, (char*, int, Sfio_t*), (s, n, f))

      return _stdgets(f, s, n, 0);
}

char*
gets(char* s)
{
      return _stdgets(sfstdin, s, BUFSIZ, 1);
}

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