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AT_PARSER_CHECK for data that contains backslashes. It currently uses 'echo', and 'echo' isn't portable if its argument contains backslashes. Problem found on OpenBSD 3.4. Also, do not assume that the byte '\0xff' is not printable in the C locale; it is, under OpenBSD 3.4 (!). Luckily, '\0x80' through '\0x9e' are not printable, so use '\0x81' to test.
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