ASN1_PRINTABLE_TYPE(3)

NAME
ASN1_PRINTABLE_type - classify a single-byte character string

SYNOPSIS
libcrypto
#include <openssl/asn1.h>
int
ASN1_PRINTABLE_type(const unsigned char *string, int len);

DESCRIPTION
ASN1_PRINTABLE_type() assumes that the given string consists of single-byte characters and classifies it according to which kinds characters occur. If len is greater than 0, at most len characters are inspected. Otherwise, the string needs to be NUL-terminated.

RETURN VALUES
If the given string contains a character outside the ascii(7) range, ASN1_PRINTABLE_type() returns V_ASN1_T61STRING.

Otherwise, if it contains a character that is neither a letter nor a digit nor the space character ( ‘ ’, ASCII 0x20) nor the apostrophe quote ( ‘'’, ASCII 0x27) nor contained in the set "()+,-./:=?", it returns V_ASN1_IA5STRING.

Otherwise, including if string is a NULL pointer or points to an empty string, it returns V_ASN1_PRINTABLESTRING.

SEE ALSO
ASN1_mbstring_copy(3), ASN1_STRING_new(3), ASN1_STRING_to_UTF8(3), isascii(3), ascii(7)

HISTORY
ASN1_PRINTABLE_type() first appeared in SSLeay 0.4.5d, has been part of the public API since SSLeay 0.5.1, and has been available since OpenBSD 2.4.

CAVEATS
The ASN.1 notion of what constitutes a PrintableString is more restrictive than what the C library function isprint(3) considers printable.