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-.Dd Aug 19, 2012
-.Dt XPRINTF_DOMAIN 3
-.Os Darwin
-.Sh NAME
-.Nm copy_printf_domain , free_printf_domain , new_printf_domain ,
-.Nm register_printf_domain_function , register_printf_domain_render_std
-.Nd extensible printf domains
-.Sh SYNOPSIS
-.In printf.h
-.Ft printf_domain_t
-.Fn copy_printf_domain "printf_domain_t domain"
-.Ft void
-.Fn free_printf_domain "printf_domain_t domain"
-.Ft printf_domain_t
-.Fn new_printf_domain void
-.Ft int
-.Fn register_printf_domain_function "printf_domain_t domain" "int spec" "printf_function *render" "printf_arginfo_function *arginfo", "void *context"
-.Ft int
-.Fn register_printf_domain_render_std "printf_domain_t domain" "const char *specs"
-.Sh DESCRIPTION
-A printf domain is an extensible printf (see
-.Xr xprintf 5 )
-structure defining a set of conversion specifiers that
-will be used in calls to the routines discussed in
-.Xr xprintf 3
-and
-.Xr xprintf_comp 3 .
-Domains can be modified independently of one another, and do not affect the
-behavior of the normal printf calls in
-.Xr printf 3 .
-.Pp
-To create a new domain, call
-.Fn new_printf_domain ;
-the standard POSIX conversion specifiers are defined by default.
-To make a copy of an existing domain, use
-.Fn copy_printf_domain .
-When a domain is no longer needed, call
-.Fn free_printf_domain
-to release the associated memory.
-.Pp
-The
-.Fn register_printf_domain_function
-function is used to add, modify or remove conversion specifiers for a
-given domain.
-The
-.Fa spec
-argument is the specifier character, which can be any printable (non-control)
-ASCII character,
-except for those characters that are used as flag/option characters.
-The set of flag/option characters includes the space character, and the
-following:
-.Pp
-.Dl # $ ' * + \&, - \&. 0 1 2 3 4 5 6 7 8 9 \&: \&; L _ h j l q t v z
-.Pp
-Two user-defined callback function must also be given; see
-.Xr xprintf 5
-for a description of these callback functions and an example of use.
-Setting either or both callbacks to
-.Dv NULL
-deletes the given specifier from the domain.
-Note that while it is permissible to redefine the standard conversion
-specifiers, it is not usually recommended as it may cause confusion.
-.Pp
-The
-.Fn register_printf_domain_render_std
-function is used to add pre-defined conversion specifiers to the given domain.
-The
-.Fa specs
-argument is a null-terminated C string containing one or more of the following
-specifier characters:
-.Bl -tag -width ".Li H"
-.It Li H
-Hex dump.
-The
-.Sq Li H
-specifier takes two arguments; the first is a pointer to the data to
-dump, while the second argument is the length of the data, given as type
-.Vt unsigned .
-Normally, 16 characters are displayed per line, as pairs of hex characters
-separated by spaces.
-Specifying a field width less than 16 will display that number of characters
-per line.
-Setting the
-.Sq Li +
-(showsign) flag will prefix each line with the hex offset of the beginning
-character in that line.
-Setting the
-.Sq Li #
-(alternate form) flag will postfix an ASCII representation to each line, with
-.Sq Li \&.
-representing non-printable characters.
-.It Li M
-Errno.
-The
-.Sq Li M
-specifier displayed the text representation of the given
-.Vt int
-argument, expected to be a valid
-.Va errno
-value (as returned by
-.Xr strerror 3 ) .
-Invalid errno values are represent by the
-.Dq Li errno=
-string followed by the decimal and hex values of the argument.
-.It Li Q
-Quoted.
-The
-.Sq Li Q
-specifier displays a null-terminated string argument as a C string, with
-leading and trailing double quotes.
-Newlines, carriage-returns and tabs are represented by
-.Sq Li \en ,
-.Sq Li \er
-and
-.Sq Li \et ,
-respectively, while backslashes and double quotes are preceeded with a
-backslash.
-All other whitespace characters not including space itself (those in which
-.Xr isspace 3
-returns true) are displayed as octal escape sequences (a backslash followed by
-three octal digits).
-All other characters print as themselves.
-.It Li T
-time_t/timeval/timespec.
-The
-.Sq Li T
-specifier displays the three types of time values as a single decimal value.
-The argument should be a pointer to the time value to be converted.
-Setting the appropriate flags indicates which type is indicated:
-.Bl -tag -width ".Pq none"
-.It Li ll
-The
-.Sq Li ll
-(long long) flag indicates the argument points to a
-.Vt struct timespec
-structure.
-The default precision is 9.
-.It Li l
-The
-.Sq Li l
-(long) flag indicates the argument points to a
-.Vt struct timeval
-structure.
-The default precision is 6.
-.It Pq none
-By default, the argument points to a
-.Vt time_t
-value.
-The default precision is 0 (the fractional part is not displayed).
-.El
-.Pp
-If the
-.Sq Li #
-(alternate form) flag is specified, the value is displayed in years, days,
-hours, minutes and seconds, as in:
-.Dq Li 3y123d21h59m59s.987654
-(zero values are not displayed at all).
-Note that the years are 365 days (no leap days).
-.It Li V
-String vis.
-The
-.Sq Li V
-specifier uses
-.Xr strvisx 3
-to display the null-terminated C string argument.
-The precision value can be used to limit the amount of the string that is
-processed (defaults to the entire string).
-.Pp
-Flag values can be used to obtain different encodings:
-.Bl -tag -width "(none)"
-.It Li +
-The
-.Sq Li +
-(showsign) flag uses the
-.Dq Li VIS_WHITE | VIS_HTTPSTYLE
-flag value to
-.Xr strvisx 3 .
-.It Li 0
-The
-.Sq Li 0
-(leading zero) flag uses the
-.Dq Li VIS_WHITE | VIS_OCTAL
-flag value to
-.Xr strvisx 3 .
-.It Li #
-The
-.Sq Li #
-(alternate form) flag uses the
-.Dq Li VIS_WHITE
-flag value to
-.Xr strvisx 3 .
-.It Pq none
-The default flag value to
-.Xr strvisx 3
-is
-.Dq Li VIS_WHITE | VIS_CSTYLE | VIS_OCTAL .
-.El
-.El
-.Sh RETURN VALUES
-The
-.Fn new_printf_domain
-and
-.Fn copy_printf_domain
-functions return the new domain, or
-.Dv NULL
-on failure (usually out of memory condition).
-.Pp
-The
-.Fn register_printf_domain_function
-and
-.Fn register_printf_domain_render_std
-return zero on success and \-1 on failure (usually due to an improper specifier
-character or out of memory condition).
-.Sh SEE ALSO
-.Xr printf 3 ,
-.Xr strvisx 3 ,
-.Xr xprintf 3 ,
-.Xr xprintf_comp 3 ,
-.Xr xprintf 5