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Do not allow NUL bytes in string literals or character constants.

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This commit is contained in:
Paul Eggert
2003-10-07 07:32:57 +00:00
parent 91d2c560a8
commit 92ac370570
3 changed files with 17 additions and 1 deletions
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7
ChangeLog
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@@ -1,3 +1,10 @@
2003-10-07 Paul Eggert <eggert@twinsun.com>
* doc/bison.texinfo (Symbols): NUL bytes are not allowed in string
literals, unfortunately.
* src/scan-gram.l (<SC_ESCAPED_STRING,SC_ESCAPED_CHARACTER>):
Complain about NUL bytes in character constants or string literals.
2003-10-05 Paul Eggert <eggert@twinsun.com>
* NEWS: Don't document %no-default-prec, as it's still

3
doc/bison.texinfo
View File

@@ -2481,7 +2481,8 @@ does not enforce this convention, but if you depart from it, people who
read your program will be confused.
All the escape sequences used in string literals in C can be used in
Bison as well. However, unlike Standard C, trigraphs have no special
Bison as well, except that you must not use a null character within a
string literal. Also, unlike Standard C, trigraphs have no special
meaning in Bison string literals, nor is backslash-newline allowed. A
literal string token must contain two or more characters; for a token
containing just one character, use a character token (see above).

8
src/scan-gram.l
View File

@@ -371,6 +371,7 @@ splice (\\[ \f\t\v]*\n)*
return STRING;
}
\0 complain_at (*loc, _("invalid null character"));
.|\n STRING_GROW;
<<EOF>> unexpected_eof (token_start, "\""); BEGIN INITIAL;
}
@@ -397,6 +398,7 @@ splice (\\[ \f\t\v]*\n)*
return ID;
}
\0 complain_at (*loc, _("invalid null character"));
.|\n STRING_GROW;
<<EOF>> unexpected_eof (token_start, "'"); BEGIN INITIAL;
}
@@ -412,6 +414,8 @@ splice (\\[ \f\t\v]*\n)*
unsigned long c = strtoul (yytext + 1, 0, 8);
if (UCHAR_MAX < c)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else if (! c)
complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
@@ -422,6 +426,8 @@ splice (\\[ \f\t\v]*\n)*
c = strtoul (yytext + 2, 0, 16);
if (UCHAR_MAX < c || get_errno ())
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else if (! c)
complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}
@@ -441,6 +447,8 @@ splice (\\[ \f\t\v]*\n)*
int c = convert_ucn_to_byte (yytext);
if (c < 0)
complain_at (*loc, _("invalid escape sequence: %s"), quote (yytext));
else if (! c)
complain_at (*loc, _("invalid null character: %s"), quote (yytext));
else
obstack_1grow (&obstack_for_string, c);
}