/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2022 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
â                                                                              â
â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/intrin/strace.internal.h"
#include "libc/macros.internal.h"
#include "libc/nt/accounting.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"

int sys_getlogin(char *, uint32_t);

/**
 * Returns login name.
 */
char *getlogin(void) {
  uint32_t size;
  const char *p, *res;
  char16_t buf16[257];
  static char login[128];
  if (IsBsd()) {
    if (sys_getlogin(login, sizeof(login)) != -1) {
      res = login;
    } else {
      res = 0;
    }
  } else if (IsWindows()) {
    size = ARRAYLEN(buf16);
    if (GetUserName(&buf16, &size)) {
      tprecode16to8(login, sizeof(login), buf16);
      res = login;
    } else {
      __winerr();
      res = 0;
    }
  } else if ((p = getenv("LOGNAME"))) {
    res = p;
  } else {
    enoent();
    res = 0;
  }
  STRACE("getlogin() â %#s% m", res);
  return res;
}
