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Full Discussion: Pure C function pointer on printing vowels twice
Top Forums Programming Pure C function pointer on printing vowels twice Post 302997639 by Corona688 on Wednesday 17th of May 2017 03:49:42 PM
Old 05-17-2017
Quote:
Originally Posted by yifangt
The return value is EOF or a single vowel, which is the first part bugging me.

Does that mean in if (putchar(c) == EOF || putchar(c) == EOF) , function putchar(c) gets actually executed twice?
Yes. To evaluate the expression, it has to call the function.

Quote:
I thought this line is just a condition
Slapping an if() around it doesn't change it. Would you expect this to print the values?

Code:
#include <stdio.h>

int main(void) {
    printf("a") && printf("b");
}

Treat anything inside an if() the exact same way.

Quote:
Let me put my question in another way:
Is there another layer
No.

For C, the answer to this question is always "no".

With very specific exceptions - like atexit() - C will never call a function without being asked.
 

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LEARN ABOUT LINUX

pure-statsdecode

pure-statsdecode(8)						     Pure-FTPd						       pure-statsdecode(8)

NAME

       pure-statsdecode - Show human-readable dates from a "stats" logfile

SYNTAX

       pure-statsdecode filename
       pure-statsdecode -

DESCRIPTION

       This program decodes Pure-FTPd's "stats" log files and converts timestamps into human-readable dates.

OPTIONS

       -      means to read the standard input.

       filename
	      is a log file produced with pure-ftpd -O ftpstats:/path/to/logfile

EXAMPLES

       To run this program the standard way type:

       pure-statsdecode /var/log/pureftpd.log > /tmp/pureftpd.humanlog

       Alternativly you can run it as:

       cat /var/log/pureftpd.log | pure-statsdecode - | gzip --best > /tmp/pureftpd.humanlog.gz

AUTHORS

       Frank DENIS <j at pureftpd dot org>

SEE ALSO

       ftp(1), pure-ftpd(8) pure-ftpwho(8) pure-mrtginfo(8) pure-uploadscript(8) pure-statsdecode(8) pure-pw(8) pure-quotacheck(8) pure-authd(8)

       RFC 959, RFC 2228, RFC 2389 and RFC 2428.

Pure-FTPd team							      1.0.36						       pure-statsdecode(8)
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