Rot-13: Difference between revisions

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@@ Line 6,873: / Line 6,873: @@
 =={{header|Zig}}==
-<syntaxhighlight lang="zig">
+{{Works with|Zig|0.11.x}}
-// Warning: modifies the buffer in-place (returns pointer to in)
+{{Works with|Zig|0.12.0-dev.1643+91329ce94}}
-fn rot13(in: [] u8) []u8 {
-    for (in) |*c| {
+<syntaxhighlight lang="zig">const std = @import("std");
-        var d : u8 = c.*;
-        var x : u8 = d;
+pub const Rot13 = struct {
-        x = if (@subWithOverflow(u8, d | 32, 97, &x) ) x else x;
-        if (x < 26) {
+    pub fn char(ch: u8) u8 {
-            x = (x + 13) % 26 + 65 + (d & 32);
+        return switch (ch) {
-            c.* = x;
+            'a'...'m', 'A'...'M' => |c| c + 13,
-        }
+            'n'...'z', 'N'...'Z' => |c| c - 13,
+            else => |c| c,
+        };
     }
-    return in;
-}
+    /// Caller owns returned memory.
-const msg: [:0] const u8 =
+    pub fn slice(allocator: std.mem.Allocator, input: []const u8) error{OutOfMemory}![]u8 {
-    \\Lbh xabj vg vf tbvat gb or n onq qnl
+        const output = try allocator.alloc(u8, input.len);
-    \\ jura gur yrggref va lbhe nycunorg fbhc
+        errdefer allocator.free(output);
-    \\ fcryy Q-V-F-N-F-G-R-E.
-;
+        for (input, output) |input_ch, *output_ch| {
-// need to copy the const string to a buffer
+            output_ch.* = char(input_ch);
-// before we can modify it in-place
+        }
-//https://zig.news/kristoff/what-s-a-string-literal-in-zig-31e9
+        return output;
-var buf: [500]u8 = undefined;
-fn assignStr(out: []u8, str: [:0]const u8) void {
-    for (str) |c, i| {
-        out[i] = c;
     }
+};
-    out[str.len] = 0;
-}
+pub fn main() error{OutOfMemory}!void {
+    var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+    const message_input =
+        \\@@@111@@@ Lbh xabj vg vf tbvat gb or n onq qnl
+        \\ jura gur yrggref va lbhe nycunorg fbhc
+        \\ fcryy Q-V-F-N-F-G-R-E.
+    ;
+    const message_decoded = try Rot13.slice(allocator, message_input);
+    defer allocator.free(message_decoded);
+    std.debug.print(
+        \\{s}
+        \\=== Decoded to ===
+        \\{s}
+        \\
+    , .{
+        message_input,
+        message_decoded,
+    });
+    std.debug.print("\n", .{});
+    const message_encoded = try Rot13.slice(allocator, message_decoded);
+    defer allocator.free(message_encoded);
+    std.debug.print(
+        \\{s}
+        \\=== Encoded to ===
+        \\{s}
+        \\
+    , .{
+        message_decoded,
+        message_encoded,
+    });
+}</syntaxhighlight>
+{{out}}
+<pre>
+@@@111@@@ Lbh xabj vg vf tbvat gb or n onq qnl
+ jura gur yrggref va lbhe nycunorg fbhc
+ fcryy Q-V-F-N-F-G-R-E.
+=== Decoded to ===
+@@@111@@@ You know it is going to be a bad day
+ when the letters in your alphabet soup
+ spell D-I-S-A-S-T-E-R.
+@@@111@@@ You know it is going to be a bad day
-const print = @import("std").debug.print;
+ when the letters in your alphabet soup
+ spell D-I-S-A-S-T-E-R.
+=== Encoded to ===
+@@@111@@@ Lbh xabj vg vf tbvat gb or n onq qnl
+ jura gur yrggref va lbhe nycunorg fbhc
+ fcryy Q-V-F-N-F-G-R-E.
+</pre>
-pub fn main() void {
-    assignStr(&buf, msg);
-    print("rot13={s}\n",.{rot13(&buf)});
-}
-</syntaxhighlight>
 =={{header|zkl}}==