Shell: Add POSIX-compliant character escaping

POSIX.1-2017, Shells & Utilities, section 2.2
fleximus · Sep 14, 2019 · f44e7dc · f44e7dc
1 parent 2d24b12
commit f44e7dc
Showing 1 changed file with 25 additions and 0 deletions.
diff --git a/Shell/Parser.cpp b/Shell/Parser.cpp
@@ -84,6 +84,16 @@ Vector<Command> Parser::parse()
  m_state = State::InRedirectionPath;
  break;
  }
+ if (ch == '\\') {
+ if (i == m_input.length() - 1) {
+ fprintf(stderr, "Syntax error: Nothing to escape (\\)\n");
+ return {};
+ }
+ char next_ch = m_input.characters()[i + 1];
+ m_token.append(next_ch);
+ ++i;
+ break;
+ }
  if (ch == '\'') {
  m_state = State::InSingleQuotes;
  break;
@@ -147,6 +157,21 @@ Vector<Command> Parser::parse()
  m_state = State::Free;
  break;
  }
+ if (ch == '\\') {
+ if (i == m_input.length() - 1) {
+ fprintf(stderr, "Syntax error: Nothing to escape (\\)\n");
+ return {};
+ }
+ char next_ch = m_input.characters()[i + 1];
+ if (next_ch == '$' || next_ch == '`'
+ || next_ch == '"' || next_ch == '\\') {
+ m_token.append(next_ch);
+ ++i;
+ continue;
+ }
+ m_token.append('\\');
+ break;
+ }
  m_token.append(ch);
  break;
  };