about validity check in netsnmp for community string, v3 username, v3 passphrase , syscontact, sysLocation, sysName

Hello Friends,
Greetings.
I have question regarding validity check for following parameters which are
configurable
in snmpd.conf. validity check means
     a) maximum number of allowed bytes
     b) which character are allowed ? I want to know  range of character in
allowed set for configuration.
         means whether character / digit / special characters etc.
     c) minimum number of character which must specify ?
         (like for minimum 8 character passphrase we need to specify,
similarly what is range for others ? )
     d) special format like in our C programming language for declaring
variable
         format is (<Character>|<character|digit>*) i.e. first character
must be bet (a-z)
         so for variable that i have said is there any rule ?

parameters which i need to check are
1) community string for v1/v2
2) user name for v3
3) passphrase (Auth/ Priv)  for v3
4) sysContact
6) sysLocation
7) sysName

Please help me in this.
Thanks in advance.
Regards
Bhushan. E . Sonawane

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