#include "sfhdr.h"
#if __STD_C
Sfulong_t sfgetm(reg Sfio_t* f, Sfulong_t m)
#else
Sfulong_t sfgetm(f, m)
reg Sfio_t* f;
Sfulong_t m;
#endif
{
Sfulong_t v;
reg uchar *s, *ends, c;
reg int p;
SFMTXSTART(f, (Sfulong_t)(-1));
if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
SFMTXRETURN(f, (Sfulong_t)(-1));
SFLOCK(f,0);
for(v = 0;; )
{ if(SFRPEEK(f,s,p) <= 0)
{ f->flags |= SF_ERROR;
v = (Sfulong_t)(-1);
goto done;
}
for(ends = s+p; s < ends;)
{ c = *s++;
v = (v << SF_BBITS) | SFBVALUE(c);
if((m >>= SF_BBITS) <= 0)
{ f->next = s;
goto done;
}
}
f->next = s;
}
done:
SFOPEN(f,0);
SFMTXRETURN(f, v);
}