#printf for moonx

Version 0.2.2 behavior is documented here. The support record separates local verification from published MoonX behavior; moonx examples use registry releases.

Format and print data like printf(1):

moonx cli/printf '%s=%d\n' answer 42
moonx cli/printf '%5.2f|%-8x|%o\n' 3.14159 255 8
moonx cli/printf '%s\n' one two three   # format reused per argument
moonx cli/printf '\x41é\n'

Supported: the escapes \a \b \e \f \n \r \t \v \\ \" \' \NNN \0NNN \xHH\uHHHH \UHHHHHHHH \c (stop output); the conversions %s %c %b %d %i %u %o%x %X %f %F %e %E %g %G %a %A %% with flags -+ 0#, field width, and precision (width and precision accept *). %b interprets escapes in its argument. Numeric arguments accept decimal, 0x hex, leading-0 octal, and 'C or "C for a character code. The format is reused until all arguments are consumed.

Float conversions use the frozen GNU Linux amd64 extended-precision profile (64 significand bits and the x87 exponent range), with exact conversion and round-half-even on every supported host and backend. Hexadecimal %a/%A preserves negative zero, subnormals, special values and requested precision, with Linux GNU forms such as 0xcp-3 for 1.5. NaN retains its sign and requested plus/space flags. Zero padding follows the sign and 0x prefix. The running host's long-double ABI is not selected, and non-C locale behavior is not claimed. Use -- before a FORMAT that starts with -. Invalid numeric prefixes produce the converted prefix plus a diagnostic and status 1; the format is still repeated as needed.

Bare %q emits GNU C-byte shell quoting, including ANSI-C escapes for controls and non-ASCII bytes. A real empty argument prints ''; a missing argument prints nothing. Flags, width and precision on %q reject the conversion while retaining output already produced before it.

#Standalone metadata

Standalone --version prints exactly printf 0.2.2 followed by one newline. Standalone --help starts with Usage: printf, lists both metadata options, and ends with a newline. Both write to stdout, leave stdin unread, and exit with status 0. Exact-version publication and verification remain recorded separately in the support record.

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