ASN1_STRING_print_ex.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" ASN1_tag2str, ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp, ASN1_STRING_print \&\- ASN1_STRING output routines .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/asn1.h> \& \& int ASN1_STRING_print_ex(BIO *out, const ASN1_STRING *str, unsigned long flags); \& int ASN1_STRING_print_ex_fp(FILE *fp, const ASN1_STRING *str, unsigned long flags); \& int ASN1_STRING_print(BIO *out, const ASN1_STRING *str); \& \& const char *ASN1_tag2str(int tag); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions output an \fB\s-1ASN1_STRING\s0\fR structure. \fB\s-1ASN1_STRING\s0\fR is used to represent all the \s-1ASN1\s0 string types. .PP \&\fBASN1_STRING_print_ex()\fR outputs \fBstr\fR to \fBout\fR, the format is determined by the options \fBflags\fR. \fBASN1_STRING_print_ex_fp()\fR is identical except it outputs to \fBfp\fR instead. .PP \&\fBASN1_STRING_print()\fR prints \fBstr\fR to \fBout\fR but using a different format to \&\fBASN1_STRING_print_ex()\fR. It replaces unprintable characters (other than \s-1CR, LF\s0) with '.'. .PP \&\fBASN1_tag2str()\fR returns a human-readable name of the specified \s-1ASN.1\s0 \fBtag\fR. .SH "NOTES" .IX Header "NOTES" \&\fBASN1_STRING_print()\fR is a deprecated function which should be avoided; use \&\fBASN1_STRING_print_ex()\fR instead. .PP Although there are a large number of options frequently \fB\s-1ASN1_STRFLGS_RFC2253\s0\fR is suitable, or on \s-1UTF8\s0 terminals \fB\s-1ASN1_STRFLGS_RFC2253 &\s0 ~ASN1_STRFLGS_ESC_MSB\fR. .PP The complete set of supported options for \fBflags\fR is listed below. .PP Various characters can be escaped. If \fB\s-1ASN1_STRFLGS_ESC_2253\s0\fR is set the characters determined by \s-1RFC2253\s0 are escaped. If \fB\s-1ASN1_STRFLGS_ESC_CTRL\s0\fR is set control characters are escaped. If \fB\s-1ASN1_STRFLGS_ESC_MSB\s0\fR is set characters with the \&\s-1MSB\s0 set are escaped: this option should \fBnot\fR be used if the terminal correctly interprets \s-1UTF8\s0 sequences. .PP Escaping takes several forms. .PP If the character being escaped is a 16 bit character then the form \*(L"\eUXXXX\*(R" is used using exactly four characters for the hex representation. If it is 32 bits then \&\*(L"\eWXXXXXXXX\*(R" is used using eight characters of its hex representation. These forms will only be used if \s-1UTF8\s0 conversion is not set (see below). .PP Printable characters are normally escaped using the backslash '\e' character. If \&\fB\s-1ASN1_STRFLGS_ESC_QUOTE\s0\fR is set then the whole string is instead surrounded by double quote characters: this is arguably more readable than the backslash notation. Other characters use the \*(L"\eXX\*(R" using exactly two characters of the hex representation. .PP If \fB\s-1ASN1_STRFLGS_UTF8_CONVERT\s0\fR is set then characters are converted to \s-1UTF8\s0 format first. If the terminal supports the display of \s-1UTF8\s0 sequences then this option will correctly display multi byte characters. .PP If \fB\s-1ASN1_STRFLGS_IGNORE_TYPE\s0\fR is set then the string type is not interpreted at all: everything is assumed to be one byte per character. This is primarily for debugging purposes and can result in confusing output in multi character strings. .PP If \fB\s-1ASN1_STRFLGS_SHOW_TYPE\s0\fR is set then the string type itself is printed out before its value (for example \*(L"\s-1BMPSTRING\*(R"\s0), this actually uses \fBASN1_tag2str()\fR. .PP The content of a string instead of being interpreted can be \*(L"dumped\*(R": this just outputs the value of the string using the form #XXXX using hex format for each octet. .PP If \fB\s-1ASN1_STRFLGS_DUMP_ALL\s0\fR is set then any type is dumped. .PP Normally non character string types (such as \s-1OCTET STRING\s0) are assumed to be one byte per character, if \fB\s-1ASN1_STRFLGS_DUMP_UNKNOWN\s0\fR is set then they will be dumped instead. .PP When a type is dumped normally just the content octets are printed, if \&\fB\s-1ASN1_STRFLGS_DUMP_DER\s0\fR is set then the complete encoding is dumped instead (including tag and length octets). .PP \&\fB\s-1ASN1_STRFLGS_RFC2253\s0\fR includes all the flags required by \s-1RFC2253.\s0 It is equivalent to: \s-1ASN1_STRFLGS_ESC_2253\s0 | \s-1ASN1_STRFLGS_ESC_CTRL\s0 | \s-1ASN1_STRFLGS_ESC_MSB\s0 | \s-1ASN1_STRFLGS_UTF8_CONVERT\s0 | \s-1ASN1_STRFLGS_DUMP_UNKNOWN ASN1_STRFLGS_DUMP_DER\s0 .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBASN1_STRING_print_ex()\fR and \fBASN1_STRING_print_ex_fp()\fR return the number of characters written or \-1 if an error occurred. .PP \&\fBASN1_STRING_print()\fR returns 1 on success or 0 on error. .PP \&\fBASN1_tag2str()\fR returns a human-readable name of the specified \s-1ASN.1\s0 \fBtag\fR. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBX509_NAME_print_ex\fR\|(3), \&\fBASN1_tag2str\fR\|(3) .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2002\-2018 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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