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feat: add slightly more robust fmtBuf API

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This commit is contained in:
CJ van den Berg 2026-03-12 21:42:13 +01:00
parent 0b1c94eae2
commit 46e7709232
Signed by: neurocyte
GPG key ID: 8EB1E1BB660E3FB9
2 changed files with 20 additions and 0 deletions
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6
src/cbor.zig
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@ -301,6 +301,12 @@ pub fn fmt(buf: []u8, value: anytype) []const u8 {
return writer.buffered(); return writer.buffered();
} }
pub fn fmtBuf(buf: []u8, value: anytype) Io.Writer.Error![]const u8 {
var writer: Io.Writer = .fixed(buf);
try writeValue(&writer, value);
return writer.buffered();
}
const CborType = struct { type: u8, minor: u5, major: u3 }; const CborType = struct { type: u8, minor: u5, major: u3 };
pub fn decodeType(iter: *[]const u8) error{TooShort}!CborType { pub fn decodeType(iter: *[]const u8) error{TooShort}!CborType {

14
test/tests.zig
View file

@ -9,6 +9,7 @@ const expectEqualStrings = std.testing.expectEqualStrings;
const expectError = std.testing.expectError; const expectError = std.testing.expectError;
const fmt = cbor_mod.fmt; const fmt = cbor_mod.fmt;
const fmtBuf = cbor_mod.fmtBuf;
const toJson = cbor_mod.toJson; const toJson = cbor_mod.toJson;
const toJsonPretty = cbor_mod.toJsonPretty; const toJsonPretty = cbor_mod.toJsonPretty;
const fromJson = cbor_mod.fromJson; const fromJson = cbor_mod.fromJson;
@ -44,6 +45,19 @@ test "cbor simple" {
); );
} }
test "cbor.fmtBuf success" {
var buf: [128]u8 = undefined;
try expectEqualDeep(
try fmtBuf(&buf, .{ "five", 5, "four", 4, .{ "three", 3 } }),
&[_]u8{ 0x85, 0x64, 0x66, 0x69, 0x76, 0x65, 0x05, 0x64, 0x66, 0x6f, 0x75, 0x72, 0x04, 0x82, 0x65, 0x74, 0x68, 0x72, 0x65, 0x65, 0x03 },
);
}
test "cbor.fmtBuf overflow" {
var buf: [4]u8 = undefined;
try expectError(error.NoSpaceLeft, fmtBuf(&buf, .{ "five", 5, "four", 4, .{ "three", 3 } }));
}
test "cbor exit message" { test "cbor exit message" {
var buf: [128]u8 = undefined; var buf: [128]u8 = undefined;
try expectEqualDeep( try expectEqualDeep(