UTF-8 chars never displayed in get/walk output for 5.7.3

Hi,

 I already added bug report
(https://sourceforge.net/p/net-snmp/bugs/2815/), but probably issue need
additional discussion.

Server with net-snmp daemon, where I added some string with UTF8 chars
for testing purposes (but I know real system where used UTF8 chars).

My test string is: "Rue de la Métallurgie, 4530 Villers-le-Bouillet, België"

in old versions (seems as pre 5.7) I see correct UTF8 string in get/walk
requests

**NET-SNMP version: 5.4.3 (Ubuntu 12.04.5)**

SNMPv2-MIB::sysLocation.0 = STRING: Rue de la Métallurgie, 4530
Villers-le-Bouillet, België

**NET-SNMP version: 5.5 (CentOS 6)**

SNMPv2-MIB::sysLocation.0 = STRING: Rue de la Métallurgie, 4530
Villers-le-Bouillet, België

but for 5.7.x on different system, I see 2 dots instead each UTF8 chars:

**NET-SNMP version: 5.7.3 (Ubuntu 16.04.3)**
**NET-SNMP version: 5.7.3 (FreeBSD 10.3-RELEASE-p18)**

SNMPv2-MIB::sysLocation.0 = STRING: Rue de la M..tallurgie, 4530
Villers-le-Bouillet, Belgi..


I'm not C-guru, but I think this is DISPLAY-HINT conversion issue.

For such strings used textual conversion
SNMPv2-TC::DisplayString (DISPLAY-HINT "255a")

I compared code from 5.7.3 and 5.4.4 in snmplib/mib.c
and see string conversion cardinally changed for "a" and "t" hints.

And I think issue something in function sprint_realloc_asciistring().

I tried rebuild Ubuntu package with old code for hint conversion, and
issue is gone for me!

Probably some one can fix this more correctly with
sprint_realloc_asciistring()?


-- 
Sincerely yours,
Mike S. Stupalov, CTO NOC,
RU-CENTER Group (Northwest)
Phone: +7 981 8889951
E-mail: [email protected]

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