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Support multiple \u sequences and check errors

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This commit is contained in:
Ekaitz Zarraga 2020-05-19 05:41:10 +02:00
parent c448e8b441
commit e79d2aefea
1 changed files with 37 additions and 4 deletions
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41
lib/chibi/json.c
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@ -54,11 +54,24 @@ sexp parse_json_literal (sexp ctx, sexp self, sexp str, const char* s, int* i, c
return res;
}
#define USEQ_LEN 4
long decode_useq(const char* s){
char utf_tmp[USEQ_LEN+1];
for (int iter=0; iter!=USEQ_LEN; iter++){
if (!isxdigit(s[iter])){
return -1;
}
}
strncpy(utf_tmp, s, USEQ_LEN);
return strtol(utf_tmp, NULL, 16);
}
sexp parse_json_string (sexp ctx, sexp self, sexp str, const char* s, int* i, const int len) {
sexp_gc_var2(res, tmp);
sexp_gc_preserve2(ctx, res, tmp);
char utf_tmp[5];
int from = *i, to = *i;
long utfchar, utfchar2;
res = SEXP_NULL;
for ( ; s[to] != '"'; ++to) {
if (to+1 >= len) {
@ -80,10 +93,29 @@ sexp parse_json_string (sexp ctx, sexp self, sexp str, const char* s, int* i, co
from = to+1;
break;
case 'u':
strncpy(utf_tmp, s+to+1, 5);
tmp = sexp_make_string(ctx, sexp_make_fixnum(1), sexp_make_character(strtoll(utf_tmp, NULL, 16)));
utfchar = decode_useq(s+to+1);
if (utfchar == -1){
res = sexp_json_exception(ctx, self, "invalid \\u sequence at", str, *i);
goto except;
}
to = to+USEQ_LEN;
if ( 0xd800 <= utfchar && utfchar <= 0xdbff && s[to+2] == 'u'){
utfchar2 = decode_useq(s+to+3);
if (utfchar2 == -1){
res = sexp_json_exception(ctx, self, "invalid \\u sequence at", str, *i);
goto except;
}
if ( 0xdc00 <= utfchar2 && utfchar <=0xdfff ){
utfchar = 0x10000 + (((utfchar - 0xd800) << 10) | (utfchar2 - 0xdc00));
to = to + USEQ_LEN +2;
}
}
tmp = sexp_make_string(ctx, sexp_make_fixnum(1), sexp_make_character(utfchar));
res = sexp_cons(ctx, tmp, res);
from = to+5;
from = to + 1;
break;
default:
from = to;
@ -91,6 +123,7 @@ sexp parse_json_string (sexp ctx, sexp self, sexp str, const char* s, int* i, co
}
}
}
except:
if (!sexp_exceptionp(res)) {
tmp = sexp_c_string(ctx, s+from, to-from);
if (res == SEXP_NULL) {