auronandace
160 lines
5.5 KiB
Rust
160 lines
5.5 KiB
Rust
//! `langinfo.h` implementation.
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//!
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//! See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/langinfo.h.html>.
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// TODO : involve loading locale data. Currently, the implementation only supports the "C" locale.
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use core::ffi::c_char;
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/langinfo.h.html>.
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///
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/// POSIX type for items used with `nl_langinfo`
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/// In practice, this is an integer index into the string table.
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pub type nl_item = i32;
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// Static string table for langinfo constants
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static STRING_TABLE: [&[u8]; 57] = [
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b"UTF-8\0", // CODESET
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b"%a %b %e %H:%M:%S %Y\0", // D_T_FMT
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b"%m/%d/%y\0", // D_FMT
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b"%H:%M:%S\0", // T_FMT
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b"%I:%M:%S %p\0", // T_FMT_AMPM
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b"AM\0", // AM_STR
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b"PM\0", // PM_STR
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b"Sunday\0", // DAY_1
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b"Monday\0", // DAY_2
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b"Tuesday\0", // DAY_3
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b"Wednesday\0", // DAY_4
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b"Thursday\0", // DAY_5
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b"Friday\0", // DAY_6
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b"Saturday\0", // DAY_7
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b"Sun\0", // ABDAY_1
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b"Mon\0", // ABDAY_2
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b"Tue\0", // ABDAY_3
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b"Wed\0", // ABDAY_4
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b"Thu\0", // ABDAY_5
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b"Fri\0", // ABDAY_6
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b"Sat\0", // ABDAY_7
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b"January\0", // MON_1
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b"February\0", // MON_2
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b"March\0", // MON_3
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b"April\0", // MON_4
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b"May\0", // MON_5
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b"June\0", // MON_6
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b"July\0", // MON_7
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b"August\0", // MON_8
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b"September\0", // MON_9
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b"October\0", // MON_10
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b"November\0", // MON_11
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b"December\0", // MON_12
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b"Jan\0", // ABMON_1
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b"Feb\0", // ABMON_2
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b"Mar\0", // ABMON_3
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b"Apr\0", // ABMON_4
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b"May\0", // ABMON_5
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b"Jun\0", // ABMON_6
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b"Jul\0", // ABMON_7
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b"Aug\0", // ABMON_8
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b"Sep\0", // ABMON_9
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b"Oct\0", // ABMON_10
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b"Nov\0", // ABMON_11
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b"Dec\0", // ABMON_12
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b"\0", // ERA
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b"\0", // ERA_D_FMT
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b"\0", // ERA_D_T_FMT
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b"\0", // ERA_T_FMT
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b"\0", // ALT_DIGITS
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b".\0", // RADIXCHAR
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b"\0", // THOUSEP
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b".\0", // CRNCYSTR
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b"^[yY]\0", // YESEXPR
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b"^[nN]\0", // NOEXPR
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b"yes\0", // YESSTR
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b"no\0", // NOSTR
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];
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// Item constants
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pub const CODESET: nl_item = 0;
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pub const D_T_FMT: nl_item = 1;
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pub const D_FMT: nl_item = 2;
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pub const T_FMT: nl_item = 3;
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pub const T_FMT_AMPM: nl_item = 4;
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pub const AM_STR: nl_item = 5;
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pub const PM_STR: nl_item = 6;
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pub const DAY_1: nl_item = 7;
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pub const DAY_2: nl_item = 8;
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pub const DAY_3: nl_item = 9;
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pub const DAY_4: nl_item = 10;
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pub const DAY_5: nl_item = 11;
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pub const DAY_6: nl_item = 12;
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pub const DAY_7: nl_item = 13;
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pub const ABDAY_1: nl_item = 14;
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pub const ABDAY_2: nl_item = 15;
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pub const ABDAY_3: nl_item = 16;
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pub const ABDAY_4: nl_item = 17;
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pub const ABDAY_5: nl_item = 18;
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pub const ABDAY_6: nl_item = 19;
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pub const ABDAY_7: nl_item = 20;
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pub const MON_1: nl_item = 21;
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pub const MON_2: nl_item = 22;
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pub const MON_3: nl_item = 23;
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pub const MON_4: nl_item = 24;
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pub const MON_5: nl_item = 25;
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pub const MON_6: nl_item = 26;
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pub const MON_7: nl_item = 27;
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pub const MON_8: nl_item = 28;
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pub const MON_9: nl_item = 29;
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pub const MON_10: nl_item = 30;
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pub const MON_11: nl_item = 31;
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pub const MON_12: nl_item = 32;
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pub const ABMON_1: nl_item = 33;
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pub const ABMON_2: nl_item = 34;
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pub const ABMON_3: nl_item = 35;
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pub const ABMON_4: nl_item = 36;
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pub const ABMON_5: nl_item = 37;
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pub const ABMON_6: nl_item = 38;
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pub const ABMON_7: nl_item = 39;
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pub const ABMON_8: nl_item = 40;
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pub const ABMON_9: nl_item = 41;
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pub const ABMON_10: nl_item = 42;
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pub const ABMON_11: nl_item = 43;
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pub const ABMON_12: nl_item = 44;
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pub const ERA: nl_item = 45;
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pub const ERA_D_FMT: nl_item = 46;
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pub const ERA_D_T_FMT: nl_item = 47;
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pub const ERA_T_FMT: nl_item = 48;
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pub const ALT_DIGITS: nl_item = 49;
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pub const RADIXCHAR: nl_item = 50;
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pub const THOUSEP: nl_item = 51;
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pub const YESEXPR: nl_item = 52;
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pub const NOEXPR: nl_item = 53;
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pub const YESSTR: nl_item = 54; // Legacy
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pub const NOSTR: nl_item = 55; // Legacy
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pub const CRNCYSTR: nl_item = 56;
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/// See <https://pubs.opengroup.org/onlinepubs/9799919799/functions/nl_langinfo.html>.
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///
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/// Get a string from the langinfo table
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///
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/// # Safety
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/// - Caller must ensure `item` is a valid `nl_item` index.
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/// - Returns a pointer to a null-terminated string, or an empty string if the item is invalid.
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/// - Compatibility requires mutable pointer to be returned, but it should not be mutated!
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#[unsafe(no_mangle)]
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pub unsafe extern "C" fn nl_langinfo(item: nl_item) -> *mut c_char {
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// Validate the item and perform the lookup
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let ptr = if (item as usize) < STRING_TABLE.len() {
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STRING_TABLE[item as usize].as_ptr() as *const c_char
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} else {
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// Return a pointer to an empty string if the item is invalid
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b"\0".as_ptr() as *const c_char
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};
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// Mutable pointer is required (unsafe!)
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ptr as *mut c_char
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}
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