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Early escape in reading invalid escape sequence.

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This commit is contained in:
Christoffer Lerno
2021-12-03 17:06:52 +01:00
parent bc2d789c2e
commit cae1933f0f
1 changed files with 14 additions and 3 deletions
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17
src/compiler/lexer.c
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@@ -826,8 +826,9 @@ static int append_esc_string_token(char *restrict dest, const char *restrict src
case 'x':
{
int h = char_to_nibble(src[1]);
if (h < 0) return -1;
int l = char_to_nibble(src[2]);
if (h < 0 || l < 0) return -1;
if (l < 0) return -1;
unicode_char = ((unsigned) h << 4U) + (unsigned)l;
scanned = 3;
break;
@@ -835,10 +836,13 @@ static int append_esc_string_token(char *restrict dest, const char *restrict src
case 'u':
{
int x1 = char_to_nibble(src[1]);
if (x1 < 0) return -1;
int x2 = char_to_nibble(src[2]);
if (x2 < 0) return -1;
int x3 = char_to_nibble(src[3]);
if (x3 < 0) return -1;
int x4 = char_to_nibble(src[4]);
if (x1 < 0 || x2 < 0 || x3 < 0 || x4 < 0) return -1;
if (x4 < 0) return -1;
unicode_char = ((unsigned) x1 << 12U) + ((unsigned) x2 << 8U) + ((unsigned) x3 << 4U) + (unsigned)x4;
scanned = 5;
break;
@@ -846,14 +850,21 @@ static int append_esc_string_token(char *restrict dest, const char *restrict src
case 'U':
{
int x1 = char_to_nibble(src[1]);
if (x1 < 0) return -1;
int x2 = char_to_nibble(src[2]);
if (x2 < 0) return -1;
int x3 = char_to_nibble(src[3]);
if (x3 < 0) return -1;
int x4 = char_to_nibble(src[4]);
if (x4 < 0) return -1;
int x5 = char_to_nibble(src[5]);
if (x5 < 0) return -1;
int x6 = char_to_nibble(src[6]);
if (x6 < 0) return -1;
int x7 = char_to_nibble(src[7]);
if (x7 < 0) return -1;
int x8 = char_to_nibble(src[8]);
if (x1 < 0 || x2 < 0 || x3 < 0 || x4 < 0 || x5 < 0 || x6 < 0 || x7 < 0 || x8 < 0) return -1;
if (x8 < 0) return -1;
unicode_char = ((unsigned) x1 << 28U) + ((unsigned) x2 << 24U) + ((unsigned) x3 << 20U) + ((unsigned) x4 << 16U) +
((unsigned) x5 << 12U) + ((unsigned) x6 << 8U) + ((unsigned) x7 << 4U) + (unsigned)x8;
scanned = 9;