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Added error handling to substring

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This commit is contained in:
Justin Ethier 2015-06-25 22:04:20 -04:00
parent fcf9158d1c
commit 1d72873117
1 changed files with 18 additions and 5 deletions
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23
runtime.c
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@ -857,13 +857,26 @@ integer_type Cyc_string_length(object str) {
return len;
}
TODO: need error checking below, this is much too dangerous without!
string_type Cyc_substring(object str, object start, object end) {
int s = integer_value(start),
e = integer_value(end);
const char *raw = string_str(str);
make_stringn(sub, raw + s, e - s);
return sub;
int s = integer_value(start),
e = integer_value(end),
len = strlen(raw);
if (s > e) {
Cyc_rt_raise2("substring - start cannot be greater than end", start);
}
if (s > len) {
Cyc_rt_raise2("substring - start cannot be greater than string length", start);
}
if (e > len) {
e = len;
}
{
make_stringn(sub, raw + s, e - s);
return sub;
}
}
integer_type Cyc_system(object cmd) {