compiler/
lib/
examples/
std/
arch/
collections/
lang/
sys/
arch.rad
65 B
collections.rad
36 B
fmt.rad
3.8 KiB
intrinsics.rad
399 B
io.rad
1.2 KiB
lang.rad
222 B
mem.rad
2.1 KiB
sys.rad
167 B
testing.rad
2.3 KiB
tests.rad
11.6 KiB
vec.rad
3.1 KiB
std.rad
231 B
scripts/
seed/
test/
vim/
.gitignore
353 B
.gitsigners
112 B
LICENSE
1.1 KiB
Makefile
3.0 KiB
README
2.5 KiB
std.lib
1.0 KiB
std.lib.test
252 B
lib/std/fmt.rad
raw
| 1 | //! Formatting utilities for converting values to strings. |
| 2 | use super::mem; |
| 3 | |
| 4 | /// Maximum string length for a formatted u32 (eg. "4294967295"). |
| 5 | pub const U32_STR_LEN: u32 = 10; |
| 6 | /// Maximum string length for a formatted i32 (eg. "-2147483648"). |
| 7 | pub const I32_STR_LEN: u32 = U32_STR_LEN + 1; |
| 8 | /// Maximum string length for a formatted u64 (eg. "18446744073709551615"). |
| 9 | pub const U64_STR_LEN: u32 = 20; |
| 10 | /// Maximum string length for a formatted i64 (eg. "-9223372036854775808"). |
| 11 | pub const I64_STR_LEN: u32 = 20; |
| 12 | /// Maximum string length for a formatted bool (eg. "false"). |
| 13 | pub const BOOL_STR_LEN: u32 = 5; |
| 14 | |
| 15 | /// Format a u32 by writing it to the provided buffer. |
| 16 | pub fn formatU32(val: u32, buffer: *mut [u8]) -> *[u8] { |
| 17 | assert buffer.len >= U32_STR_LEN; |
| 18 | |
| 19 | let mut x: u32 = val; |
| 20 | let mut i: u32 = buffer.len; |
| 21 | |
| 22 | // Handle the zero case separately to ensure a single '0' is written. |
| 23 | if x == 0 { |
| 24 | i -= 1; |
| 25 | buffer[i] = '0'; |
| 26 | } else { |
| 27 | // Write digits backwards from the end of the buffer. |
| 28 | while x != 0 { |
| 29 | i -= 1; |
| 30 | buffer[i] = ('0' + (x % 10) as u8); |
| 31 | x /= 10; |
| 32 | } |
| 33 | } |
| 34 | // Return the slice from the start of the written number to |
| 35 | // the end of the buffer. |
| 36 | return &buffer[i..]; |
| 37 | } |
| 38 | |
| 39 | /// Format a i32 by writing it to the provided buffer. |
| 40 | pub fn formatI32(val: i32, buffer: *mut [u8]) -> *[u8] { |
| 41 | assert buffer.len >= I32_STR_LEN; |
| 42 | |
| 43 | let neg: bool = val < 0; |
| 44 | let mut x: u32 = -val as u32 if neg else val as u32; |
| 45 | let mut i: u32 = buffer.len; |
| 46 | // Handle the zero case separately to ensure a single '0' is written. |
| 47 | if x == 0 { |
| 48 | i -= 1; |
| 49 | buffer[i] = '0'; |
| 50 | } else { |
| 51 | // Write digits backwards from the end of the buffer. |
| 52 | while x != 0 { |
| 53 | i -= 1; |
| 54 | buffer[i] = '0' + (x % 10) as u8; |
| 55 | x /= 10; |
| 56 | } |
| 57 | // Add the negative sign if needed. |
| 58 | if neg { |
| 59 | i -= 1; |
| 60 | buffer[i] = '-'; |
| 61 | } |
| 62 | } |
| 63 | return &buffer[i..]; |
| 64 | } |
| 65 | |
| 66 | /// Format a u64 by writing it to the provided buffer. |
| 67 | pub fn formatU64(val: u64, buffer: *mut [u8]) -> *[u8] { |
| 68 | assert buffer.len >= U64_STR_LEN; |
| 69 | |
| 70 | let mut x: u64 = val; |
| 71 | let mut i: u32 = buffer.len; |
| 72 | |
| 73 | if x == 0 { |
| 74 | i -= 1; |
| 75 | buffer[i] = '0'; |
| 76 | } else { |
| 77 | while x != 0 { |
| 78 | i -= 1; |
| 79 | buffer[i] = ('0' + (x % 10) as u8); |
| 80 | x /= 10; |
| 81 | } |
| 82 | } |
| 83 | return &buffer[i..]; |
| 84 | } |
| 85 | |
| 86 | /// Format a i64 by writing it to the provided buffer. |
| 87 | pub fn formatI64(val: i64, buffer: *mut [u8]) -> *[u8] { |
| 88 | assert buffer.len >= I64_STR_LEN; |
| 89 | |
| 90 | let neg: bool = val < 0; |
| 91 | let mut x: u64 = -val as u64 if neg else val as u64; |
| 92 | let mut i: u32 = buffer.len; |
| 93 | if x == 0 { |
| 94 | i -= 1; |
| 95 | buffer[i] = '0'; |
| 96 | } else { |
| 97 | while x != 0 { |
| 98 | i -= 1; |
| 99 | buffer[i] = '0' + (x % 10) as u8; |
| 100 | x /= 10; |
| 101 | } |
| 102 | if neg { |
| 103 | i -= 1; |
| 104 | buffer[i] = '-'; |
| 105 | } |
| 106 | } |
| 107 | return &buffer[i..]; |
| 108 | } |
| 109 | |
| 110 | /// Format a i8 by writing it to the provided buffer. |
| 111 | pub fn formatI8(val: i8, buffer: *mut [u8]) -> *[u8] { |
| 112 | return formatI32(val as i32, buffer); |
| 113 | } |
| 114 | |
| 115 | /// Format a i16 by writing it to the provided buffer. |
| 116 | pub fn formatI16(val: i16, buffer: *mut [u8]) -> *[u8] { |
| 117 | return formatI32(val as i32, buffer); |
| 118 | } |
| 119 | |
| 120 | /// Format a u8 by writing it to the provided buffer. |
| 121 | pub fn formatU8(val: u8, buffer: *mut [u8]) -> *[u8] { |
| 122 | return formatU32(val as u32, buffer); |
| 123 | } |
| 124 | |
| 125 | /// Format a u16 by writing it to the provided buffer. |
| 126 | pub fn formatU16(val: u16, buffer: *mut [u8]) -> *[u8] { |
| 127 | return formatU32(val as u32, buffer); |
| 128 | } |
| 129 | |
| 130 | /// Format a bool by writing it to the provided buffer. |
| 131 | pub fn formatBool(val: bool, buffer: *mut [u8]) -> *[u8] { |
| 132 | if val { |
| 133 | try! mem::copy(buffer, "true"); |
| 134 | return &buffer[..4]; |
| 135 | } else { |
| 136 | try! mem::copy(buffer, "false"); |
| 137 | return &buffer[..5]; |
| 138 | } |
| 139 | } |