(gettext) c-format
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15.3.1 C Format Strings
-----------------------
C format strings are described in POSIX (IEEE P1003.1 2001), section
XSH 3 fprintf(),
`http://www.opengroup.org/onlinepubs/007904975/functions/fprintf.html'.
See also the fprintf() manual page,
`http://www.linuxvalley.it/encyclopedia/ldp/manpage/man3/printf.3.php',
`http://informatik.fh-wuerzburg.de/student/i510/man/printf.html'.
Although format strings with positions that reorder arguments, such
as
"Only %2$d bytes free on '%1$s'."
which is semantically equivalent to
"'%s' has only %d bytes free."
are a POSIX/XSI feature and not specified by ISO C 99, translators can
rely on this reordering ability: On the few platforms where `printf()',
`fprintf()' etc. don't support this feature natively, `libintl.a' or
`libintl.so' provides replacement functions, and GNU `<libintl.h>'
activates these replacement functions automatically.
As a special feature for Farsi (Persian) and maybe Arabic,
translators can insert an `I' flag into numeric format directives. For
example, the translation of `"%d"' can be `"%Id"'. The effect of this
flag, on systems with GNU `libc', is that in the output, the ASCII
digits are replaced with the `outdigits' defined in the `LC_CTYPE'
locale facet. On other systems, the `gettext' function removes this
flag, so that it has no effect.
Note that the programmer should _not_ put this flag into the
untranslated string. (Putting the `I' format directive flag into an
MSGID string would lead to undefined behaviour on platforms without
glibc when NLS is disabled.)
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