tiny.choir.ir.format

1const std = @import("std");23pub fn appendFmt(4    buf: []u8,5    pos: usize,6    comptime fmt: []const u8,7    args: anytype,8) !usize {9    const slice = try std.fmt.bufPrint(buf[pos..], fmt, args);10    return pos + slice.len;11}1213pub fn intPayload(buf: []u8, value: anytype) ![]const u8 {14    return std.fmt.bufPrint(buf, "{d}", .{value});15}1617test "format.appendFmt appends and advances position" {18    const testing = std.testing;19    var buf: [32]u8 = undefined;2021    var pos: usize = 0;22    pos = try appendFmt(buf[0..], pos, "hello", .{});23    pos = try appendFmt(buf[0..], pos, " {s} {d}", .{ "world", 42 });2425    try testing.expectEqualStrings("hello world 42", buf[0..pos]);26}2728test "format.intPayload formats integers" {29    const testing = std.testing;30    var buf: [16]u8 = undefined;3132    const payload = try intPayload(buf[0..], 12345);33    try testing.expectEqualStrings("12345", payload);34}3536test "format.appendFmt errors on small buffer" {37    const testing = std.testing;38    var buf: [4]u8 = undefined;3940    try testing.expectError(error.NoSpaceLeft, appendFmt(buf[0..], 0, "hello", .{}));41}4243test "format.intPayload errors on small buffer" {44    const testing = std.testing;45    var buf: [2]u8 = undefined;4647    try testing.expectError(error.NoSpaceLeft, intPayload(buf[0..], 123));48}

1pub const format = @import("format.zig");