noh.h: Add noh_sv_copy_cstr and noh_sv_compare

src/noh.h

@@ -357,6 +357,9 @@ typedef struct {
     const char *elems;
 } Noh_String_View;
 
+// Copies a c-string to the arena and returns it as a Noh_String_View.
+Noh_String_View noh_sv_copy_cstr(Noh_Arena *arena, const char *cstr);
+
 // Appends a Noh_String_View view into a Noh_String.
 void noh_string_append_sv(Noh_String *string, Noh_String_View sv);
 
@@ -403,6 +406,13 @@ Noh_String_View noh_sv_from_cstr(const char *cstr);
 // Creates a string view from a string.
 Noh_String_View noh_sv_from_string(const Noh_String *string);
 
+// Compares two string views.
+// Returns:
+// - 0 if the two strings are equal.
+// - A negative value if a is smaller than b.
+// - A positive value if a is greater than b.
+int noh_sv_compare(Noh_String_View a, Noh_String_View b);
+
 // Checks whether to string views contain the same string.
 bool noh_sv_eq(Noh_String_View a, Noh_String_View b);
 
@@ -883,6 +893,13 @@ defer:
 
 ///////////////////////// String view /////////////////////////
 
+Noh_String_View noh_sv_copy_cstr(Noh_Arena *arena, const char *cstr) {
+    size_t len = strlen(cstr);
+    char *buffer = noh_arena_alloc(arena, len);
+    memcpy(buffer, cstr, len);
+    return (Noh_String_View){ .elems = buffer, .count = len };
+}
+
 void noh_string_append_sv(Noh_String *string, Noh_String_View sv) {
     noh_da_append_multiple(string, sv.elems, sv.count);
 }
@@ -999,6 +1016,18 @@ Noh_String_View noh_sv_from_string(const Noh_String *string) {
     return result;
 }
 
+int noh_sv_compare(Noh_String_View a, Noh_String_View b) {
+    size_t count = a.count;
+    if (b.count < a.count) count = b.count;
+
+    for (size_t i = 0; i < count; i++) {
+        if (a.elems[i] == b.elems[i]) continue;
+        return a.elems[i] - b.elems[i];
+    }
+
+    return a.count - b.count;
+}
+
 bool noh_sv_eq(Noh_String_View a, Noh_String_View b) {
     if (a.count != b.count) return false;