solve Challenge 1 of Set 1

.gitignore

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+.*.swp
+
+*/*/zig-cache
+*/*/zig-out

set1/challenge1_hex2base64/build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.build.Builder) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard release options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    const mode = b.standardReleaseOptions();
+
+    const exe = b.addExecutable("challenge1_hex2base64", "src/main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(mode);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+}

set1/challenge1_hex2base64/src/main.zig

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+const std = @import("std");
+
+pub fn main() anyerror!void {
+    const stdin = std.io.bufferedReader(std.io.getStdIn().reader()).reader();
+    const stdout = std.io.getStdOut().writer();
+
+    var inputbuffer = std.mem.zeroes([1024]u8);
+    var rawbuffer = std.mem.zeroes([512]u8);
+    var outputbuffer = std.mem.zeroes([1024]u8);
+
+    while (true) {
+        const line = stdin.readUntilDelimiterOrEof(inputbuffer[0..], '\n') catch |err| {
+            std.log.err("input failed: {s}\n", .{err});
+            return;
+        };
+        const hex = line orelse return;
+        const raw = std.fmt.hexToBytes(rawbuffer[0..], hex) catch {
+            std.log.err("not a valid hexadecimal\n", .{});
+            continue;
+        };
+        const base64 = std.base64.standard.Encoder.encode(outputbuffer[0..], raw);
+        stdout.print("{s}\n", .{base64}) catch |err| {
+            std.log.err("output failed: {s}\n", .{err});
+            return;
+        };
+    }
+}