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C-style octal escapes, including 1- and 2-digit escapes

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This commit is contained in:
Murphy Berzish 2017-02-23 18:33:10 -05:00
parent 61bbf8ba7e
commit eb0ba26f90
1 changed files with 17 additions and 0 deletions
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17
src/ast/seq_decl_plugin.cpp
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@ -57,6 +57,23 @@ static bool is_escape_char(char const *& s, unsigned& result) {
s += 4;
return true;
}
/* C-standard octal escapes: either 1, 2, or 3 octal digits,
* stopping either at 3 digits or at the first non-digit character.
*/
/* 1 octal digit */
if (is_octal_digit(*(s + 1), d1) && !is_octal_digit(*(s + 2), d2)) {
result = d1;
s += 2;
return true;
}
/* 2 octal digits */
if (is_octal_digit(*(s + 1), d1) && is_octal_digit(*(s + 2), d2) &&
!is_octal_digit(*(s + 3), d3)) {
result = d1 * 8 + d2;
s += 3;
return true;
}
/* 3 octal digits */
if (is_octal_digit(*(s + 1), d1) && is_octal_digit(*(s + 2), d2) &&
is_octal_digit(*(s + 3), d3)) {
result = d1*64 + d2*8 + d3;