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Top Forums Programming Some questions regarding old if.c Post 302930452 by ongoto on Sunday 4th of January 2015 09:09:33 AM
Old 01-04-2015
Quote:
Code:
if (exp()) is asking if the function exists; it's not calling that function.
...

I think there's a good chance that code that you identified actually does make the call to exp(), with unknown data on the stack. I think to just check if the function exists, the code would be if ( exp ) .
That is possible. I can't remember all the type checking details used in those days either. One way Bash (nowadays) distinguises between a variable named 'func' and a function named 'func()' is the parentheses. But that may not have been true 20 years ago in the C language.

Last edited by ongoto; 01-04-2015 at 10:34 AM..
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snexpire,v0.3.8(8)					      System Manager's Manual						snexpire,v0.3.8(8)

NAME
snexpire - expire news under the sn system. SYNOPSIS
snexpire [-v] [-exp] newsgroup [[-exp] newsgroup]... DESCRIPTION
snexpire expires news in the sn news system, one article file (=10 articles, compile time default) at a time. snexpire always leaves behind at least one article file, so that newly entered articles will have numbers not overlapping previously used numbers. As an excep- tion if the expiration age is set to 0, then even this last file will be expired and subsequent article numbers will start from the begin- ning. You will need to be root or own /var/spool/sn to run snexpire. OPTIONS
-v Output a line for each article expired. The format of this line is the same as for snscan. ARGUMENTS
snexpire expires all newsgroups named on the command line. Each newsgroup may be preceded by -exp to control the expiration age. exp is of the form #[hdwmy] where # is a number, followed by one of the characters h,d,w,m,y representing hours, days, weeks, months and years. The default for -exp is a compile-time fixed. Each [-exp] applies to the next newsgroup only, any newsgroups after that one get default treatment unless overridden by another [-exp]. FILES MODIFIED
/var/spool/sn/newsgroup/.times, /var/spool/sn/newsgroup/[0123456789]*, /var/spool/sn/{.chain,.table}. ENVIRONMENT VARIABLES
SNROOT If this is set and is not empty, the value is used in place of /var/spool/sn, the default news spool directory. FILES
/var/spool/sn/newsgroup/.expire If this exists, its contents are taken to be exp if not overridden by -exp on the command line. N.B. Harold Tay snexpire,v0.3.8(8)
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