/usr/share/calc/help/files is in apcalc-common 2.12.5.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | NAME
files - return a file or the maximum number of open files
SYNOPSIS
files([fnum])
TYPES
fnum int
return files, int or null
DESCRIPTION
This function, when given the argument fnum, will use it as an
index into an internal table of open file and return a file value.
If that entry in the table is not in use, then the null value is
returned instead. When no args are given, the maximum number of
open files is returned.
If you overwrite a variable containing a file value or don't save the
result of an 'fopen', the opened file still remains open. Such 'lost'
files can be recovered by using the 'files' function.
The first 3 file entries always refer to standard input, output
and error respectively. (see the example below) These three
files are already open by the calculator and cannot be closed.
When calc starts up, it scans for open file descriptors above
stderr (2) and below MAXFILES (20). Any open descriptor found
is assumed to be an open file opened in an unknown mode. Calc
will try to read and write to this file when directed.
Consider the following commands shell commands:
echo "A line of text in the file on descriptor 5" > datafile
calc 5<datafile
then one could do the following:
; files(5)
FILE 5 "descriptor[5]" (unknown_mode, pos 0)
; fgetline(files(5))
"A line of text in the file on descriptor 5"
EXAMPLE
; fd = fopen("/etc/motd", "r")
; fd
FILE 3 "/etc/motd" (reading, pos 0)
; files(3)
FILE 3 "/etc/motd" (reading, pos 0)
; if (isnull(files(4))) print "not open"
not open
; stdin = files(0)
; stdout = files(1)
; stderr = files(2)
; print files()
20
LIMITS
none
LINK LIBRARY
none
SEE ALSO
errno, fclose, feof, ferror, fflush, fgetc, fgetline, fgets, files, fopen,
fprintf, fputc, fputs, fseek, fsize, ftell, isfile, printf, prompt
## Copyright (C) 1999-2006 Landon Curt Noll
##
## Calc is open software; you can redistribute it and/or modify it under
## the terms of the version 2.1 of the GNU Lesser General Public License
## as published by the Free Software Foundation.
##
## Calc 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 Lesser General
## Public License for more details.
##
## A copy of version 2.1 of the GNU Lesser General Public License is
## distributed with calc under the filename COPYING-LGPL. You should have
## received a copy with calc; if not, write to Free Software Foundation, Inc.
## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
##
## @(#) $Revision: 30.1 $
## @(#) $Id: files,v 30.1 2007/03/16 11:10:42 chongo Exp $
## @(#) $Source: /usr/local/src/bin/calc/help/RCS/files,v $
##
## Under source code control: 1995/03/04 11:33:19
## File existed as early as: 1995
##
## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
|