define(`DNSLOOKUP_IGNORE_TARGET_HOSTS', `')dnl
define(`DNSLOOKUP_DOMAINS', `! +local_domains')dnl
dnl
dnl find substring `$2' in string `$1'
define(`ifelse_strstr',`define(`_STR_INDEX_',`index(`$1',`$2')')`'define(`_IS_SET_',`eval(_STR_INDEX_ >= 0)')`'ifelse(_IS_SET_,`1',`$3',`$4')')
dnl
dnl change all occurences of the first character (`$2') in the string `$1' to second character (`$3')
define(`replace_char', `translit(`$1', `$2', `$3')')
dnl
define(`semicolon2pipe', `translit(`$1', `:', `|')')
define(`pipe2semicolon', `translit(`$1', `|', `:')')
dnl
dnl convert string `$1 to lower'
define(`lower', `translit(`$1', `ABCDEFGHIJKLMNOPQRSTUVWXYZ', `abcdefghijklmnopqrstuvwx')')
dnl
dnl caseinsensitive compare of strings `$1' and `$2'
define(`strcasecmp', `ifelse(lower($1), lower($2), `1', `0')')
dnl
dnl define if not yet defined: if `$1' is not defined it will be `$2'
define(`def_if_not',`ifdef(`$1',`',`define(`$1',`$2')')')