C++ strftime %b not working as expected - c++

Question

I want to print timestamp using C++ in different locales, I get strange output for fr_FR in one particular host.
Here is the code,
#include <time.h> /* time_t, struct tm, time, localtime, strftime */
#include <stdlib.h>
#include <locale.h>
#include <clocale>
#include <iostream>
using namespace std;
int main()
{
time_t rawtime;
struct tm * timeinfo;
char buffer [32];
setlocale(LC_ALL, "");
cout << "LC_ALL: " << setlocale(LC_ALL, NULL) << endl;
cout << "LC_CTYPE: " << setlocale(LC_CTYPE, NULL) << endl;
time (&rawtime);
timeinfo = localtime (&rawtime);
strftime (buffer,sizeof(buffer),"%a %b %d %H:%M:%S %Y %Z",timeinfo);
puts (buffer);
return 0;
}
Before running the above program I did
export LANG=fr_FR.ISO8859-1
It gives output,
LC_ALL: fr_FR.ISO8859-1
LC_CTYPE: fr_FR.ISO8859-1
ven. avril 12 08:49:55 2013 UTC
It gives same output for both %b and %B, when I checked in another machine, it works as expected. Output,
LC_ALL: fr_FR.ISO8859-1
LC_CTYPE: fr_FR.ISO8859-1
jeu avr 11 23:26:24 2013 PDT
In one machine,
$date +%b
avr
$date +%B
avril
In problamatic machine,
$date +%b
avril
$date +%B
avril
Please help me to solve this issue.

Answer 1

The output appears correct.
"avril" is a legitimate abbreviation for "avril" Reference.
"Avr" is also an abbreviation for "avril". French months "juin" and "juillet", both beginning with the same 3 letters demonstrate that using the first 3 letters won't always work.
C++ does not specify how to abbreviate month names other than the default locale. Thus assuming the abbreviation are short, the same length within a locale or implemented the same in various OS world wide is problematic.
Recommend checking the return value of strftime().