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lwres_gai_strerror()'s return value is massaged to remove the const qualifier,

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as specified by RFC 2133.   It's still ultimately const, just not with
the qualifier.
This commit is contained in:
David Lawrence
2000-06-01 19:11:21 +00:00
parent 1b6d529cb5
commit 50bd180f4b
1 changed files with 29 additions and 13 deletions
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42
lib/lwres/gai_strerror.c
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@@ -12,32 +12,48 @@ you didn't get a copy, you may request one from <license@inner.net>.
char *
lwres_gai_strerror(int errnum) {
union {
const char *konst;
char *var;
} u;
/*
* The union game is played here because RFC 2133 specifies
* gai_strerror as returning just "char *", not qualified by
* const, but the most reasonably way to implement this function
* is with const strings.
*
* The caller had better not attempt to modify the return string.
*/
switch(errnum) {
case 0:
return ("no error");
u.konst = "no error";
case EAI_BADFLAGS:
return ("invalid value for ai_flags");
u.konst = "invalid value for ai_flags";
case EAI_NONAME:
return ("name or service is not known");
u.konst = "name or service is not known";
case EAI_AGAIN:
return ("temporary failure in name resolution");
u.konst = "temporary failure in name resolution";
case EAI_FAIL:
return ("non-recoverable failure in name resolution");
u.konst = "non-recoverable failure in name resolution";
case EAI_NODATA:
return ("no address associated with name");
u.konst = "no address associated with name";
case EAI_FAMILY:
return ("ai_family not supported");
u.konst = "ai_family not supported";
case EAI_SOCKTYPE:
return ("ai_socktype not supported");
u.konst = "ai_socktype not supported";
case EAI_SERVICE:
return ("service not supported for ai_socktype");
u.konst = "service not supported for ai_socktype";
case EAI_ADDRFAMILY:
return ("address family for name not supported");
u.konst = "address family for name not supported";
case EAI_MEMORY:
return ("memory allocation failure");
u.konst = "memory allocation failure";
case EAI_SYSTEM:
return ("system error");
u.konst = "system error";
default:
return ("unknown error");
u.konst = "unknown error";
};
return (u.var);
}