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Shell: Allow empty tokens if enclosed in single or double quotes

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Previously the shell parser would discard empty tokens. We now allow
them when they are enclosed in quotes (either '' or "")

This means that a command like _echo ""_ will actually pass an empty
string to /bin/echo in argv[1] now.
This commit is contained in:
Andreas Kling
2020-01-25 12:16:45 +01:00
parent 003d52ce6e
commit ed90d39cd7
2 changed files with 6 additions and 5 deletions
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8
Shell/Parser.cpp
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@@ -29,9 +29,9 @@
#include <unistd.h>
#include <ctype.h>
void Parser::commit_token()
void Parser::commit_token(AllowEmptyToken allow_empty)
{
if (m_token.is_empty())
if (allow_empty == AllowEmptyToken::No && m_token.is_empty())
return;
if (m_state == InRedirectionPath) {
m_redirections.last().path = String::copy(m_token);
@@ -239,7 +239,7 @@ Vector<Command> Parser::parse()
break;
case State::InSingleQuotes:
if (ch == '\'') {
commit_token();
commit_token(AllowEmptyToken::Yes);
m_state = State::Free;
break;
}
@@ -247,7 +247,7 @@ Vector<Command> Parser::parse()
break;
case State::InDoubleQuotes:
if (ch == '\"') {
commit_token();
commit_token(AllowEmptyToken::Yes);
m_state = State::Free;
break;
}