Detect invalid control characters #128
Description
Environment
toml++ version and/or commit hash:
v3 f3bd22b
Compiler:
gcc 11.1.0
C++ standard mode:
c++20
Target arch:
linux x86_64
Library configuration overrides:
n/a
Relevant compilation flags:
meson build_tt --buildtype=release -Dbuild_tt_encoder=true -Dbuild_tt_decoder=true -Dgenerate_cmake_config=false
Describe the bug
A TOML document containing only invalid control characters should return an error.
For example, a file with on a single byte of 0x0b (vertical tab) or 0x0c (form feed) is an invalid TOML document.
Steps to reproduce (or a small repro code sample)
On Linux with zsh, create a file with only a vertical tab and consume with tt_decoder:
$ echo -n "\v" > tomlpp.1
$ hexdump -C <tomlpp.1
00000000 0b |.|
00000001
$ tt_decoder <tomlpp.1
{}
Additional information
The same file returns an error with other decoders, such as toml.dart:
$ decoder <tomlpp.1
Unhandled exception:
TOML parse error: key expected OR "[" expected OR "[[" expected OR newline or end of input expected at 1:1
#0 TomlParserException.fromResult (package:toml/src/decoder/exception/parser.dart:25)
#1 TomlParserExceptionExtension.valueOrTomlException (package:toml/src/decoder/exception/parser.dart:84)
#2 TomlDocument.parse (package:toml/src/ast/document.dart:33)
#3 main (file:///x/src/github.com/just95/toml.dart/bin/decoder.dart:66)
<asynchronous suspension>
Found while doing differential fuzzing against go-toml.