Refactor langinfo module to use a static string table for constants
This commit is contained in:
Guillaume Gielly
+70
-147
@@ -5,160 +5,83 @@
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use core::ffi::c_char;
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/// TODO : the POSIX type for items used with `nl_langinfo` (not implemented), which is defined in <nl_types.h>
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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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// Constant definitions
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const ITEMS: &[(nl_item, &[u8])] = &[
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(CODESET, b"UTF-8\0"),
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(D_T_FMT, b"%a %b %e %H:%M:%S %Y\0"),
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(D_FMT, b"%m/%d/%y\0"),
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(T_FMT, b"%H:%M:%S\0"),
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(T_FMT_AMPM, b"%I:%M:%S %p\0"),
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(AM_STR, b"AM\0"),
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(PM_STR, b"PM\0"),
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(DAY_1, b"Sunday\0"),
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(DAY_2, b"Monday\0"),
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(DAY_3, b"Tuesday\0"),
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(DAY_4, b"Wednesday\0"),
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(DAY_5, b"Thursday\0"),
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(DAY_6, b"Friday\0"),
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(DAY_7, b"Saturday\0"),
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(ABDAY_1, b"Sun\0"),
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(ABDAY_2, b"Mon\0"),
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(ABDAY_3, b"Tue\0"),
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(ABDAY_4, b"Wed\0"),
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(ABDAY_5, b"Thu\0"),
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(ABDAY_6, b"Fri\0"),
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(ABDAY_7, b"Sat\0"),
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(MON_1, b"January\0"),
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(MON_2, b"February\0"),
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(MON_3, b"March\0"),
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(MON_4, b"April\0"),
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(MON_5, b"May\0"),
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(MON_6, b"June\0"),
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(MON_7, b"July\0"),
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(MON_8, b"August\0"),
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(MON_9, b"September\0"),
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(MON_10, b"October\0"),
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(MON_11, b"November\0"),
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(MON_12, b"December\0"),
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(ABMON_1, b"Jan\0"),
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(ABMON_2, b"Feb\0"),
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(ABMON_3, b"Mar\0"),
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(ABMON_4, b"Apr\0"),
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(ABMON_5, b"May\0"),
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(ABMON_6, b"Jun\0"),
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(ABMON_7, b"Jul\0"),
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(ABMON_8, b"Aug\0"),
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(ABMON_9, b"Sep\0"),
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(ABMON_10, b"Oct\0"),
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(ABMON_11, b"Nov\0"),
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(ABMON_12, b"Dec\0"),
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(ERA, b"\0"),
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(ERA_D_FMT, b"\0"),
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(ERA_D_T_FMT, b"\0"),
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(ERA_T_FMT, b"\0"),
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(ALT_DIGITS, b"\0"),
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(RADIXCHAR, b".\0"),
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(THOUSEP, b"\0"),
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(CRNCYSTR, b".\0"),
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(YESEXPR, b"^[yY]\0"),
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(NOEXPR, b"^[nN]\0"),
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(YESSTR, b"yes\0"),
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(NOSTR, b"no\0"),
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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; // Legaxy
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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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const fn is_valid_nl_item(item: nl_item) -> bool {
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item >= CODESET && item <= CRNCYSTR
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}
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/// Return a pointer to a C string for the specified `nl_item`.
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/// Currently only supports the "C" locale.
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/// Get a string from the langinfo table
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///
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/// # Safety
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/// - Returns a static string pointer valid for program lifetime
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/// - Caller must not modify or free the returned pointer
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/// - The returned pointer is always null-terminated
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///
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/// # Returns
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/// - Valid pointer to a null-terminated string for valid items
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/// - Pointer to empty string for invalid items
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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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#[no_mangle]
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pub unsafe extern "C" fn nl_langinfo(item: nl_item) -> *const c_char {
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if !is_valid_nl_item(item) {
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return b"\0".as_ptr() as *const c_char;
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// Validate the item and perform the lookup
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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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for &(id, string) in ITEMS {
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if id == item {
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return string.as_ptr() as *const c_char;
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}
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}
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b"\0".as_ptr() as *const c_char
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}
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