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126 .IX Title "ASN1_STRING_print_ex 3"
127 .TH ASN1_STRING_print_ex 3 "2012-04-19" "1.0.1a" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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133 ASN1_STRING_print_ex, ASN1_STRING_print_ex_fp \- ASN1_STRING output routines.
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/asn1.h>
139 \& int ASN1_STRING_print_ex(BIO *out, ASN1_STRING *str, unsigned long flags);
140 \& int ASN1_STRING_print_ex_fp(FILE *fp, ASN1_STRING *str, unsigned long flags);
141 \& int ASN1_STRING_print(BIO *out, ASN1_STRING *str);
144 .IX Header "DESCRIPTION"
145 These functions output an \fB\s-1ASN1_STRING\s0\fR structure. \fB\s-1ASN1_STRING\s0\fR is used to
146 represent all the \s-1ASN1\s0 string types.
148 \&\fIASN1_STRING_print_ex()\fR outputs \fBstr\fR to \fBout\fR, the format is determined by
149 the options \fBflags\fR. \fIASN1_STRING_print_ex_fp()\fR is identical except it outputs
152 \&\fIASN1_STRING_print()\fR prints \fBstr\fR to \fBout\fR but using a different format to
153 \&\fIASN1_STRING_print_ex()\fR. It replaces unprintable characters (other than \s-1CR\s0, \s-1LF\s0)
157 \&\fIASN1_STRING_print()\fR is a legacy function which should be avoided in new applications.
159 Although there are a large number of options frequently \fB\s-1ASN1_STRFLGS_RFC2253\s0\fR is
160 suitable, or on \s-1UTF8\s0 terminals \fB\s-1ASN1_STRFLGS_RFC2253\s0 & ~ASN1_STRFLGS_ESC_MSB\fR.
162 The complete set of supported options for \fBflags\fR is listed below.
164 Various characters can be escaped. If \fB\s-1ASN1_STRFLGS_ESC_2253\s0\fR is set the characters
165 determined by \s-1RFC2253\s0 are escaped. If \fB\s-1ASN1_STRFLGS_ESC_CTRL\s0\fR is set control
166 characters are escaped. If \fB\s-1ASN1_STRFLGS_ESC_MSB\s0\fR is set characters with the
167 \&\s-1MSB\s0 set are escaped: this option should \fBnot\fR be used if the terminal correctly
168 interprets \s-1UTF8\s0 sequences.
170 Escaping takes several forms.
172 If the character being escaped is a 16 bit character then the form \*(L"\eUXXXX\*(R" is used
173 using exactly four characters for the hex representation. If it is 32 bits then
174 \&\*(L"\eWXXXXXXXX\*(R" is used using eight characters of its hex representation. These forms
175 will only be used if \s-1UTF8\s0 conversion is not set (see below).
177 Printable characters are normally escaped using the backslash '\e' character. If
178 \&\fB\s-1ASN1_STRFLGS_ESC_QUOTE\s0\fR is set then the whole string is instead surrounded by
179 double quote characters: this is arguably more readable than the backslash
180 notation. Other characters use the \*(L"\eXX\*(R" using exactly two characters of the hex
183 If \fB\s-1ASN1_STRFLGS_UTF8_CONVERT\s0\fR is set then characters are converted to \s-1UTF8\s0
184 format first. If the terminal supports the display of \s-1UTF8\s0 sequences then this
185 option will correctly display multi byte characters.
187 If \fB\s-1ASN1_STRFLGS_IGNORE_TYPE\s0\fR is set then the string type is not interpreted at
188 all: everything is assumed to be one byte per character. This is primarily for
189 debugging purposes and can result in confusing output in multi character strings.
191 If \fB\s-1ASN1_STRFLGS_SHOW_TYPE\s0\fR is set then the string type itself is printed out
192 before its value (for example \*(L"\s-1BMPSTRING\s0\*(R"), this actually uses \fIASN1_tag2str()\fR.
194 The content of a string instead of being interpreted can be \*(L"dumped\*(R": this just
195 outputs the value of the string using the form #XXXX using hex format for each
198 If \fB\s-1ASN1_STRFLGS_DUMP_ALL\s0\fR is set then any type is dumped.
200 Normally non character string types (such as \s-1OCTET\s0 \s-1STRING\s0) are assumed to be
201 one byte per character, if \fB\s-1ASN1_STRFLGS_DUMP_UNKNOWN\s0\fR is set then they will
204 When a type is dumped normally just the content octets are printed, if
205 \&\fB\s-1ASN1_STRFLGS_DUMP_DER\s0\fR is set then the complete encoding is dumped
206 instead (including tag and length octets).
208 \&\fB\s-1ASN1_STRFLGS_RFC2253\s0\fR includes all the flags required by \s-1RFC2253\s0. It is
210 \s-1ASN1_STRFLGS_ESC_2253\s0 | \s-1ASN1_STRFLGS_ESC_CTRL\s0 | \s-1ASN1_STRFLGS_ESC_MSB\s0 |
211 \s-1ASN1_STRFLGS_UTF8_CONVERT\s0 | \s-1ASN1_STRFLGS_DUMP_UNKNOWN\s0 \s-1ASN1_STRFLGS_DUMP_DER\s0
213 .IX Header "SEE ALSO"
214 \&\fIX509_NAME_print_ex\fR\|(3),
215 \&\fIASN1_tag2str\fR\|(3)