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/** @file unixfile.c
*
* The interface to a fast variety of file routines in the unix system.
*/
/* #[ License : */
/*
* Copyright (C) 1984-2026 J.A.M. Vermaseren
* When using this file you are requested to refer to the publication
* J.A.M.Vermaseren "New features of FORM" math-ph/0010025
* This is considered a matter of courtesy as the development was paid
* for by FOM the Dutch physics granting agency and we would like to
* be able to track its scientific use to convince FOM of its value
* for the community.
*
* This file is part of FORM.
*
* FORM is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* FORM is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along
* with FORM. If not, see <http://www.gnu.org/licenses/>.
*/
/* #] License : */
/*
#[ Includes :
File with direct interface to the UNIX functions.
This makes a big difference in speed!
*/
#include "form3.h"
/*[13jul2005 mt]:*/
#ifdef SAFESIGNAL
/*[15oct2004 mt]:*/
/*To access errno variable and EINTR constant:*/
#include <errno.h>
/*:[15oct2004 mt]*/
#endif
/*:[13jul2005 mt]*/
#ifdef UFILES
FILES TheStdout = { 1 };
FILES *Ustdout = &TheStdout;
#ifdef GPP
extern "C" open();
extern "C" close();
extern "C" read();
extern "C" write();
extern "C" lseek();
#endif
/*
#] Includes :
#[ Uopen :
*/
FILES *Uopen(char *filename, char *mode)
{
FILES *f = (FILES *)Malloc1(sizeof(FILES),"Uopen");
int flags = 0, rights = 0644;
while ( *mode ) {
if ( *mode == 'r' ) { flags |= O_RDONLY; }
else if ( *mode == 'w' ) { flags |= O_CREAT | O_TRUNC; }
else if ( *mode == 'a' ) { flags |= O_APPEND; }
else if ( *mode == 'b' ) { }
else if ( *mode == '+' ) { flags |= O_RDWR; }
mode++;
}
f->descriptor = open(filename,flags,rights);
if ( f->descriptor >= 0 ) return(f);
if ( ( flags & O_APPEND ) != 0 ) {
flags |= O_CREAT;
f->descriptor = open(filename,flags,rights);
if ( f->descriptor >= 0 ) return(f);
}
M_free(f,"Uopen");
return(0);
}
/*
#] Uopen :
#[ Uclose :
*/
int Uclose(FILES *f)
{
int retval;
if ( f ) {
retval = close(f->descriptor);
M_free(f,"Uclose");
return(retval);
}
return(EOF);
}
/*
#] Uclose :
#[ Uread :
*/
size_t Uread(char *ptr, size_t size, size_t nobj, FILES *f)
{
/*[13jul2005 mt]:*/
#ifdef SAFESIGNAL
/*[15oct2004 mt]:*/
/*Operation read() can be interrupted by a signal. Note, this is rather unlikely,
so we do not save size*nobj for future attempts*/
size_t ret;
/*If the syscall is interrupted by a signal before it
succeeded in getting any progress, it must be repeated:*/
while( ( (ret=read(f->descriptor,ptr,size*nobj))<1)&&(errno == EINTR) );
return(ret);
#else
#ifdef DEEPDEBUG
{
POSITION pos;
SETBASEPOSITION(pos,lseek(f->descriptor,0L,SEEK_CUR));
MesPrint("handle %d: reading %ld bytes from position %p\n",f->descriptor,size*nobj,pos);
}
#endif
return(read(f->descriptor,ptr,size*nobj));
#endif
/*:[15oct2004 mt]*/
/*:[13jul2005 mt]*/
}
/*
#] Uread :
#[ Uwrite :
*/
size_t Uwrite(char *ptr, size_t size, size_t nobj, FILES *f)
{
/*[13jul2005 mt]:*/
#ifdef SAFESIGNAL
/*[15oct2004 mt]:*/
/*Operation write() can be interrupted by a signal. */
size_t ret;
size_t thesize=size*nobj;
/*If the syscall is interrupted by a signal before it
succeeded in getting any progress, it must be repeated:*/
while( ( (ret=write(f->descriptor,ptr,thesize))<1 )&&(errno == EINTR) );
return(ret);
#else
#ifdef DEEPDEBUG
{
POSITION pos;
SETBASEPOSITION(pos,lseek(f->descriptor,0L,SEEK_CUR));
MesPrint("handle %d: writing %ld bytes to position %p\n",f->descriptor,size*nobj,pos);
}
#endif
return(write(f->descriptor,ptr,size*nobj));
/*:[15oct2004 mt]*/
#endif
/*:[13jul2005 mt]*/
}
/*
#] Uwrite :
#[ Useek :
*/
int Useek(FILES *f, off_t offset, int origin)
{
if ( f && ( lseek(f->descriptor,offset,origin) >= 0 ) ) return(0);
return(-1);
}
/*
#] Useek :
#[ Utell :
*/
off_t Utell(FILES *f)
{
if ( f ) return((off_t)lseek(f->descriptor,0L,SEEK_CUR));
else return(-1);
}
/*
#] Utell :
#[ Uflush :
*/
void Uflush(FILES *f) { DUMMYUSE(f); }
/*
#] Uflush :
#[ Ugetpos :
*/
int Ugetpos(FILES *f, fpos_t *ptr)
{
DUMMYUSE(f); DUMMYUSE(ptr);
return(-1);
}
/*
#] Ugetpos :
#[ Usetpos :
*/
int Usetpos(FILES *f,fpos_t *ptr)
{
DUMMYUSE(f); DUMMYUSE(ptr);
return(-1);
}
/*
#] Usetpos :
#[ Usetbuf :
*/
void Usetbuf(FILES *f, char *ptr) { DUMMYUSE(f); DUMMYUSE(ptr); }
/*
#] Usetbuf :
*/
#endif
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