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cxxrtl: fix escape_c_string hex literal fiasco.

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In C and C++, a `\x` escape sequence consumes as many hexadecimal digits
as there are available, so it is not composable with arbitrary alnum
characters afterwards. An octal escape sequence like `\000` always has
fixed width, avoiding an issue where `\x01c` and `\x1c` produce the same
string.
This commit is contained in:
Catherine 2024-05-08 02:53:36 +00:00
parent 7294d8b5af
commit 43ddd89ba5
1 changed files with 5 additions and 4 deletions
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9
backends/cxxrtl/cxxrtl_backend.cc
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@ -615,10 +615,11 @@ std::string escape_cxx_string(const std::string &input)
output.push_back('\\');
output.push_back(c);
} else {
char l = c & 0xf, h = (c >> 4) & 0xf;
output.append("\\x");
output.push_back((h < 10 ? '0' + h : 'a' + h - 10));
output.push_back((l < 10 ? '0' + l : 'a' + l - 10));
char l = c & 0x3, m = (c >> 3) & 0x3, h = (c >> 6) & 0x3;
output.append("\\");
output.push_back('0' + h);
output.push_back('0' + m);
output.push_back('0' + l);
}
}
output.push_back('"');