tree 2251232865b9db5f556ad44f86db355468c2c64a
parent cc57416648a34bd254477d23367a31aecb6583db
author Hans Wennborg <hans@chromium.org> 1633078795 +0200
committer Copybara-Service <copybara-worker@google.com> 1633340135 -0700

[libFuzzer] Use octal instead of hex escape sequences in PrintASCII

Previously, PrintASCII would print the string "\ta" as "\x09a". However,
in C/C++ those strings are not the same: the trailing 'a' is part of the
escape sequence, which means it's equivalent to "\x9a". This is an
annoying quirk of the standard. (See
https://eel.is/c++draft/lex.ccon#nt:hexadecimal-escape-sequence)

To fix this, output three-digit octal escape sequences instead. Since
octal escapes are limited to max three digits, this avoids the problem
of subsequent characters unintentionally becoming part of the escape
sequence.

Dictionary files still use the non-C-compatible hex escapes, but I
believe we can't change the format since it comes from AFL, and
libfuzzer never writes such files, it only has to read them, so they're
not affected by this change.

Differential revision: https://reviews.llvm.org/D110920

GitOrigin-RevId: c7bd6435993ffbe0fbd1a06c2ba6fb55575edbe1