unset.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2025 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */
 
/**
 * @file unset.c
 * @brief VM opcode snippet for removing an INI entry (OP_INI_UNSET).
 *
 * Opcode: OP_INI_UNSET
 * Stack: [key:string] [section:string] [handle:int] -> [ok:int]
 *
 * Behavior
 * - Pops key, section, and handle. Removes both "section:key" and a dotted
 *   fallback key from the dictionary. Pushes 1 if the operation was attempted
 *   (with a valid handle and arguments), otherwise 0.
 *
 * Notes
 * - iniparser 4.2.6 dictionary_unset() returns void; we assume success when
 *   called with valid parameters.
 */
 
/* OP_INI_UNSET */
#ifdef FUN_WITH_INI
case OP_INI_UNSET: {
  Value vkey = pop_value(vm);
  Value vsec = pop_value(vm);
  Value vh = pop_value(vm);
  dictionary *d = ini_get((vh.type == VAL_INT) ? (int)vh.i : 0);
  const char *key = (vkey.type == VAL_STRING) ? vkey.s : NULL;
  const char *sec = (vsec.type == VAL_STRING) ? vsec.s : NULL;
  int ok = 0;
  if (d && sec && key) {
    char full[1024];
    char alt[1024];
    ini_make_full_key(full, sizeof(full), sec, key);
    memcpy(alt, full, sizeof(alt));
    for (size_t i = 0; i < sizeof(alt) && alt[i]; ++i) {
      if (alt[i] == ':') {
        alt[i] = '.';
        break;
      }
    }
    /* iniparser 4.2.6 dictionary_unset returns void; remove both forms */
    dictionary_unset(d, full);
    dictionary_unset(d, alt);
    ok = 1;
  }
  free_value(vkey);
  free_value(vsec);
  free_value(vh);
  push_value(vm, make_int(ok));
  break;
}
#endif