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Make the string type elements "immutable", akin to char const * in C

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Allows for extra security and optimization benefits
This commit is contained in:
gingerBill
2019-12-01 14:10:59 +00:00
parent 7fbe0a6f23
commit 9db81498d8
25 changed files with 255 additions and 176 deletions
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core/runtime/internal.odin
+14 -8
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@@ -369,17 +369,27 @@ memory_compare_zero :: proc "contextless" (a: rawptr, n: int) -> int #no_bounds_
return 0;
}
@private
Raw_String :: struct {
data: ^byte,
len: int,
};
string_eq :: proc "contextless" (a, b: string) -> bool {
x := transmute(Raw_String)a;
y := transmute(Raw_String)b;
switch {
case len(a) != len(b): return false;
case len(a) == 0: return true;
case &a[0] == &b[0]: return true;
case x.len != y.len: return false;
case x.len == 0: return true;
case x.data == y.data: return true;
}
return string_cmp(a, b) == 0;
}
string_cmp :: proc "contextless" (a, b: string) -> int {
return memory_compare(&a[0], &b[0], min(len(a), len(b)));
x := transmute(Raw_String)a;
y := transmute(Raw_String)b;
return memory_compare(x.data, y.data, min(x.len, y.len));
}
string_ne :: inline proc "contextless" (a, b: string) -> bool { return !string_eq(a, b); }
@@ -398,10 +408,6 @@ cstring_len :: proc "contextless" (s: cstring) -> int {
}
cstring_to_string :: proc "contextless" (s: cstring) -> string {
Raw_String :: struct {
data: ^byte,
len: int,
};
if s == nil do return "";
ptr := (^byte)(s);
n := cstring_len(s);