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-.TH PCRE 3 "12 May 2013" "PCRE 8.33"
-.SH NAME
-PCRE - Perl-compatible regular expressions
-.sp
-.B #include <pcre.h>
-.
-.
-.SH "PCRE 16-BIT API BASIC FUNCTIONS"
-.rs
-.sp
-.nf
-.B pcre16 *pcre16_compile(PCRE_SPTR16 \fIpattern\fP, int \fIoptions\fP,
-.B "     const char **\fIerrptr\fP, int *\fIerroffset\fP,"
-.B "     const unsigned char *\fItableptr\fP);"
-.sp
-.B pcre16 *pcre16_compile2(PCRE_SPTR16 \fIpattern\fP, int \fIoptions\fP,
-.B "     int *\fIerrorcodeptr\fP,"
-.B "     const char **\fIerrptr\fP, int *\fIerroffset\fP,"
-.B "     const unsigned char *\fItableptr\fP);"
-.sp
-.B pcre16_extra *pcre16_study(const pcre16 *\fIcode\fP, int \fIoptions\fP,
-.B "     const char **\fIerrptr\fP);"
-.sp
-.B void pcre16_free_study(pcre16_extra *\fIextra\fP);
-.sp
-.B int pcre16_exec(const pcre16 *\fIcode\fP, "const pcre16_extra *\fIextra\fP,"
-.B "     PCRE_SPTR16 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
-.B "     int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP);"
-.sp
-.B int pcre16_dfa_exec(const pcre16 *\fIcode\fP, "const pcre16_extra *\fIextra\fP,"
-.B "     PCRE_SPTR16 \fIsubject\fP, int \fIlength\fP, int \fIstartoffset\fP,"
-.B "     int \fIoptions\fP, int *\fIovector\fP, int \fIovecsize\fP,"
-.B "     int *\fIworkspace\fP, int \fIwscount\fP);"
-.fi
-.
-.
-.SH "PCRE 16-BIT API STRING EXTRACTION FUNCTIONS"
-.rs
-.sp
-.nf
-.B int pcre16_copy_named_substring(const pcre16 *\fIcode\fP,
-.B "     PCRE_SPTR16 \fIsubject\fP, int *\fIovector\fP,"
-.B "     int \fIstringcount\fP, PCRE_SPTR16 \fIstringname\fP,"
-.B "     PCRE_UCHAR16 *\fIbuffer\fP, int \fIbuffersize\fP);"
-.sp
-.B int pcre16_copy_substring(PCRE_SPTR16 \fIsubject\fP, int *\fIovector\fP,
-.B "     int \fIstringcount\fP, int \fIstringnumber\fP, PCRE_UCHAR16 *\fIbuffer\fP,"
-.B "     int \fIbuffersize\fP);"
-.sp
-.B int pcre16_get_named_substring(const pcre16 *\fIcode\fP,
-.B "     PCRE_SPTR16 \fIsubject\fP, int *\fIovector\fP,"
-.B "     int \fIstringcount\fP, PCRE_SPTR16 \fIstringname\fP,"
-.B "     PCRE_SPTR16 *\fIstringptr\fP);"
-.sp
-.B int pcre16_get_stringnumber(const pcre16 *\fIcode\fP,
-.B "     PCRE_SPTR16 \fIname\fP);
-.sp
-.B int pcre16_get_stringtable_entries(const pcre16 *\fIcode\fP,
-.B "     PCRE_SPTR16 \fIname\fP, PCRE_UCHAR16 **\fIfirst\fP, PCRE_UCHAR16 **\fIlast\fP);"
-.sp
-.B int pcre16_get_substring(PCRE_SPTR16 \fIsubject\fP, int *\fIovector\fP,
-.B "     int \fIstringcount\fP, int \fIstringnumber\fP,"
-.B "     PCRE_SPTR16 *\fIstringptr\fP);"
-.sp
-.B int pcre16_get_substring_list(PCRE_SPTR16 \fIsubject\fP,
-.B "     int *\fIovector\fP, int \fIstringcount\fP, PCRE_SPTR16 **\fIlistptr\fP);"
-.sp
-.B void pcre16_free_substring(PCRE_SPTR16 \fIstringptr\fP);
-.sp
-.B void pcre16_free_substring_list(PCRE_SPTR16 *\fIstringptr\fP);
-.fi
-.
-.
-.SH "PCRE 16-BIT API AUXILIARY FUNCTIONS"
-.rs
-.sp
-.nf
-.B pcre16_jit_stack *pcre16_jit_stack_alloc(int \fIstartsize\fP, int \fImaxsize\fP);
-.sp
-.B void pcre16_jit_stack_free(pcre16_jit_stack *\fIstack\fP);
-.sp
-.B void pcre16_assign_jit_stack(pcre16_extra *\fIextra\fP,
-.B "     pcre16_jit_callback \fIcallback\fP, void *\fIdata\fP);"
-.sp
-.B const unsigned char *pcre16_maketables(void);
-.sp
-.B int pcre16_fullinfo(const pcre16 *\fIcode\fP, "const pcre16_extra *\fIextra\fP,"
-.B "     int \fIwhat\fP, void *\fIwhere\fP);"
-.sp
-.B int pcre16_refcount(pcre16 *\fIcode\fP, int \fIadjust\fP);
-.sp
-.B int pcre16_config(int \fIwhat\fP, void *\fIwhere\fP);
-.sp
-.B const char *pcre16_version(void);
-.sp
-.B int pcre16_pattern_to_host_byte_order(pcre16 *\fIcode\fP,
-.B "     pcre16_extra *\fIextra\fP, const unsigned char *\fItables\fP);"
-.fi
-.
-.
-.SH "PCRE 16-BIT API INDIRECTED FUNCTIONS"
-.rs
-.sp
-.nf
-.B void *(*pcre16_malloc)(size_t);
-.sp
-.B void (*pcre16_free)(void *);
-.sp
-.B void *(*pcre16_stack_malloc)(size_t);
-.sp
-.B void (*pcre16_stack_free)(void *);
-.sp
-.B int (*pcre16_callout)(pcre16_callout_block *);
-.fi
-.
-.
-.SH "PCRE 16-BIT API 16-BIT-ONLY FUNCTION"
-.rs
-.sp
-.nf
-.B int pcre16_utf16_to_host_byte_order(PCRE_UCHAR16 *\fIoutput\fP,
-.B "     PCRE_SPTR16 \fIinput\fP, int \fIlength\fP, int *\fIbyte_order\fP,"
-.B "     int \fIkeep_boms\fP);"
-.fi
-.
-.
-.SH "THE PCRE 16-BIT LIBRARY"
-.rs
-.sp
-Starting with release 8.30, it is possible to compile a PCRE library that
-supports 16-bit character strings, including UTF-16 strings, as well as or
-instead of the original 8-bit library. The majority of the work to make this
-possible was done by Zoltan Herczeg. The two libraries contain identical sets
-of functions, used in exactly the same way. Only the names of the functions and
-the data types of their arguments and results are different. To avoid
-over-complication and reduce the documentation maintenance load, most of the
-PCRE documentation describes the 8-bit library, with only occasional references
-to the 16-bit library. This page describes what is different when you use the
-16-bit library.
-.P
-WARNING: A single application can be linked with both libraries, but you must
-take care when processing any particular pattern to use functions from just one
-library. For example, if you want to study a pattern that was compiled with
-\fBpcre16_compile()\fP, you must do so with \fBpcre16_study()\fP, not
-\fBpcre_study()\fP, and you must free the study data with
-\fBpcre16_free_study()\fP.
-.
-.
-.SH "THE HEADER FILE"
-.rs
-.sp
-There is only one header file, \fBpcre.h\fP. It contains prototypes for all the
-functions in all libraries, as well as definitions of flags, structures, error
-codes, etc.
-.
-.
-.SH "THE LIBRARY NAME"
-.rs
-.sp
-In Unix-like systems, the 16-bit library is called \fBlibpcre16\fP, and can
-normally be accesss by adding \fB-lpcre16\fP to the command for linking an
-application that uses PCRE.
-.
-.
-.SH "STRING TYPES"
-.rs
-.sp
-In the 8-bit library, strings are passed to PCRE library functions as vectors
-of bytes with the C type "char *". In the 16-bit library, strings are passed as
-vectors of unsigned 16-bit quantities. The macro PCRE_UCHAR16 specifies an
-appropriate data type, and PCRE_SPTR16 is defined as "const PCRE_UCHAR16 *". In
-very many environments, "short int" is a 16-bit data type. When PCRE is built,
-it defines PCRE_UCHAR16 as "unsigned short int", but checks that it really is a
-16-bit data type. If it is not, the build fails with an error message telling
-the maintainer to modify the definition appropriately.
-.
-.
-.SH "STRUCTURE TYPES"
-.rs
-.sp
-The types of the opaque structures that are used for compiled 16-bit patterns
-and JIT stacks are \fBpcre16\fP and \fBpcre16_jit_stack\fP respectively. The
-type of the user-accessible structure that is returned by \fBpcre16_study()\fP
-is \fBpcre16_extra\fP, and the type of the structure that is used for passing
-data to a callout function is \fBpcre16_callout_block\fP. These structures
-contain the same fields, with the same names, as their 8-bit counterparts. The
-only difference is that pointers to character strings are 16-bit instead of
-8-bit types.
-.
-.
-.SH "16-BIT FUNCTIONS"
-.rs
-.sp
-For every function in the 8-bit library there is a corresponding function in
-the 16-bit library with a name that starts with \fBpcre16_\fP instead of
-\fBpcre_\fP. The prototypes are listed above. In addition, there is one extra
-function, \fBpcre16_utf16_to_host_byte_order()\fP. This is a utility function
-that converts a UTF-16 character string to host byte order if necessary. The
-other 16-bit functions expect the strings they are passed to be in host byte
-order.
-.P
-The \fIinput\fP and \fIoutput\fP arguments of
-\fBpcre16_utf16_to_host_byte_order()\fP may point to the same address, that is,
-conversion in place is supported. The output buffer must be at least as long as
-the input.
-.P
-The \fIlength\fP argument specifies the number of 16-bit data units in the
-input string; a negative value specifies a zero-terminated string.
-.P
-If \fIbyte_order\fP is NULL, it is assumed that the string starts off in host
-byte order. This may be changed by byte-order marks (BOMs) anywhere in the
-string (commonly as the first character).
-.P
-If \fIbyte_order\fP is not NULL, a non-zero value of the integer to which it
-points means that the input starts off in host byte order, otherwise the
-opposite order is assumed. Again, BOMs in the string can change this. The final
-byte order is passed back at the end of processing.
-.P
-If \fIkeep_boms\fP is not zero, byte-order mark characters (0xfeff) are copied
-into the output string. Otherwise they are discarded.
-.P
-The result of the function is the number of 16-bit units placed into the output
-buffer, including the zero terminator if the string was zero-terminated.
-.
-.
-.SH "SUBJECT STRING OFFSETS"
-.rs
-.sp
-The lengths and starting offsets of subject strings must be specified in 16-bit
-data units, and the offsets within subject strings that are returned by the
-matching functions are in also 16-bit units rather than bytes.
-.
-.
-.SH "NAMED SUBPATTERNS"
-.rs
-.sp
-The name-to-number translation table that is maintained for named subpatterns
-uses 16-bit characters. The \fBpcre16_get_stringtable_entries()\fP function
-returns the length of each entry in the table as the number of 16-bit data
-units.
-.
-.
-.SH "OPTION NAMES"
-.rs
-.sp
-There are two new general option names, PCRE_UTF16 and PCRE_NO_UTF16_CHECK,
-which correspond to PCRE_UTF8 and PCRE_NO_UTF8_CHECK in the 8-bit library. In
-fact, these new options define the same bits in the options word. There is a
-discussion about the
-.\" HTML <a href="pcreunicode.html#utf16strings">
-.\" </a>
-validity of UTF-16 strings
-.\"
-in the
-.\" HREF
-\fBpcreunicode\fP
-.\"
-page.
-.P
-For the \fBpcre16_config()\fP function there is an option PCRE_CONFIG_UTF16
-that returns 1 if UTF-16 support is configured, otherwise 0. If this option is
-given to \fBpcre_config()\fP or \fBpcre32_config()\fP, or if the
-PCRE_CONFIG_UTF8 or PCRE_CONFIG_UTF32 option is given to \fBpcre16_config()\fP,
-the result is the PCRE_ERROR_BADOPTION error.
-.
-.
-.SH "CHARACTER CODES"
-.rs
-.sp
-In 16-bit mode, when PCRE_UTF16 is not set, character values are treated in the
-same way as in 8-bit, non UTF-8 mode, except, of course, that they can range
-from 0 to 0xffff instead of 0 to 0xff. Character types for characters less than
-0xff can therefore be influenced by the locale in the same way as before.
-Characters greater than 0xff have only one case, and no "type" (such as letter
-or digit).
-.P
-In UTF-16 mode, the character code is Unicode, in the range 0 to 0x10ffff, with
-the exception of values in the range 0xd800 to 0xdfff because those are
-"surrogate" values that are used in pairs to encode values greater than 0xffff.
-.P
-A UTF-16 string can indicate its endianness by special code knows as a
-byte-order mark (BOM). The PCRE functions do not handle this, expecting strings
-to be in host byte order. A utility function called
-\fBpcre16_utf16_to_host_byte_order()\fP is provided to help with this (see
-above).
-.
-.
-.SH "ERROR NAMES"
-.rs
-.sp
-The errors PCRE_ERROR_BADUTF16_OFFSET and PCRE_ERROR_SHORTUTF16 correspond to
-their 8-bit counterparts. The error PCRE_ERROR_BADMODE is given when a compiled
-pattern is passed to a function that processes patterns in the other
-mode, for example, if a pattern compiled with \fBpcre_compile()\fP is passed to
-\fBpcre16_exec()\fP.
-.P
-There are new error codes whose names begin with PCRE_UTF16_ERR for invalid
-UTF-16 strings, corresponding to the PCRE_UTF8_ERR codes for UTF-8 strings that
-are described in the section entitled
-.\" HTML <a href="pcreapi.html#badutf8reasons">
-.\" </a>
-"Reason codes for invalid UTF-8 strings"
-.\"
-in the main
-.\" HREF
-\fBpcreapi\fP
-.\"
-page. The UTF-16 errors are:
-.sp
-  PCRE_UTF16_ERR1  Missing low surrogate at end of string
-  PCRE_UTF16_ERR2  Invalid low surrogate follows high surrogate
-  PCRE_UTF16_ERR3  Isolated low surrogate
-  PCRE_UTF16_ERR4  Non-character
-.
-.
-.SH "ERROR TEXTS"
-.rs
-.sp
-If there is an error while compiling a pattern, the error text that is passed
-back by \fBpcre16_compile()\fP or \fBpcre16_compile2()\fP is still an 8-bit
-character string, zero-terminated.
-.
-.
-.SH "CALLOUTS"
-.rs
-.sp
-The \fIsubject\fP and \fImark\fP fields in the callout block that is passed to
-a callout function point to 16-bit vectors.
-.
-.
-.SH "TESTING"
-.rs
-.sp
-The \fBpcretest\fP program continues to operate with 8-bit input and output
-files, but it can be used for testing the 16-bit library. If it is run with the
-command line option \fB-16\fP, patterns and subject strings are converted from
-8-bit to 16-bit before being passed to PCRE, and the 16-bit library functions
-are used instead of the 8-bit ones. Returned 16-bit strings are converted to
-8-bit for output. If both the 8-bit and the 32-bit libraries were not compiled,
-\fBpcretest\fP defaults to 16-bit and the \fB-16\fP option is ignored.
-.P
-When PCRE is being built, the \fBRunTest\fP script that is called by "make
-check" uses the \fBpcretest\fP \fB-C\fP option to discover which of the 8-bit,
-16-bit and 32-bit libraries has been built, and runs the tests appropriately.
-.
-.
-.SH "NOT SUPPORTED IN 16-BIT MODE"
-.rs
-.sp
-Not all the features of the 8-bit library are available with the 16-bit
-library. The C++ and POSIX wrapper functions support only the 8-bit library,
-and the \fBpcregrep\fP program is at present 8-bit only.
-.
-.
-.SH AUTHOR
-.rs
-.sp
-.nf
-Philip Hazel
-University Computing Service
-Cambridge CB2 3QH, England.
-.fi
-.
-.
-.SH REVISION
-.rs
-.sp
-.nf
-Last updated: 12 May 2013
-Copyright (c) 1997-2013 University of Cambridge.
-.fi