# vsnprintf-posix.m4 serial 20
dnl Copyright (C) 2007-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

AC_DEFUN([gl_FUNC_VSNPRINTF_POSIX],
[
  AC_REQUIRE([gl_FUNC_VSNPRINTF_IS_POSIX])
  if test $gl_cv_func_vsnprintf_posix = no; then
    gl_PREREQ_VASNPRINTF_WITH_POSIX_EXTRAS
    gl_REPLACE_VASNPRINTF
    gl_REPLACE_VSNPRINTF
  fi
])

dnl Test whether vsnprintf exists and is POSIX compliant.
dnl Result is gl_cv_func_vsnprintf_posix.
AC_DEFUN([gl_FUNC_VSNPRINTF_IS_POSIX],
[
  AC_REQUIRE([gl_PRINTF_SIZES_C99])
  AC_REQUIRE([gl_PRINTF_SIZES_C23])
  AC_REQUIRE([gl_PRINTF_LONG_DOUBLE])
  AC_REQUIRE([gl_PRINTF_INFINITE])
  AC_REQUIRE([gl_PRINTF_INFINITE_LONG_DOUBLE])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_A])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_B])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_F])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_N])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_LS])
  AC_REQUIRE([gl_PRINTF_DIRECTIVE_LC])
  AC_REQUIRE([gl_PRINTF_POSITIONS])
  AC_REQUIRE([gl_PRINTF_FLAG_GROUPING])
  AC_REQUIRE([gl_PRINTF_FLAG_LEFTADJUST])
  AC_REQUIRE([gl_PRINTF_FLAG_ZERO])
  AC_REQUIRE([gl_PRINTF_FLAG_ALT_PRECISION_ZERO])
  AC_REQUIRE([gl_PRINTF_PRECISION])
  AC_REQUIRE([gl_PRINTF_ENOMEM])
  gl_cv_func_vsnprintf_posix=no
  AC_CHECK_FUNCS([vsnprintf])
  if test $ac_cv_func_vsnprintf = yes; then
    dnl These tests use vsnprintf() if snprintf() does not exist.
    gl_SNPRINTF_TRUNCATION_C99
    gl_SNPRINTF_RETVAL_C99
    gl_SNPRINTF_DIRECTIVE_N
    gl_SNPRINTF_SIZE1
    gl_VSNPRINTF_ZEROSIZE_C99
    case "$gl_cv_func_printf_sizes_c99" in
      *yes)
        case "$gl_cv_func_printf_sizes_c23" in
          *yes)
            case "$gl_cv_func_printf_long_double" in
              *yes)
                case "$gl_cv_func_printf_infinite" in
                  *yes)
                    case "$gl_cv_func_printf_infinite_long_double" in
                      *yes)
                        case "$gl_cv_func_printf_directive_a" in
                          *yes)
                            case "$gl_cv_func_printf_directive_b" in
                              *yes)
                                case "$gl_cv_func_printf_directive_f" in
                                  *yes)
                                    case "$gl_cv_func_printf_directive_n" in
                                      *yes)
                                        case "$gl_cv_func_printf_directive_ls" in
                                          *yes)
                                            case "$gl_cv_func_printf_directive_lc" in
                                              *yes)
                                                case "$gl_cv_func_printf_positions" in
                                                  *yes)
                                                    case "$gl_cv_func_printf_flag_grouping" in
                                                      *yes)
                                                        case "$gl_cv_func_printf_flag_leftadjust" in
                                                          *yes)
                                                            case "$gl_cv_func_printf_flag_zero" in
                                                              *yes)
                                                                case "$gl_cv_func_printf_flag_alt_precision_zero" in
                                                                  *yes)
                                                                    case "$gl_cv_func_printf_precision" in
                                                                      *yes)
                                                                        case "$gl_cv_func_printf_enomem" in
                                                                          *yes)
                                                                            case "$gl_cv_func_snprintf_truncation_c99" in
                                                                              *yes)
                                                                                case "$gl_cv_func_snprintf_retval_c99" in
                                                                                  *yes)
                                                                                    case "$gl_cv_func_snprintf_directive_n" in
                                                                                      *yes)
                                                                                        case "$gl_cv_func_snprintf_size1" in
                                                                                          *yes)
                                                                                            case "$gl_cv_func_vsnprintf_zerosize_c99" in
                                                                                              *yes)
                                                                                                # vsnprintf exists and is
                                                                                                # already POSIX compliant.
                                                                                                gl_cv_func_vsnprintf_posix=yes
                                                                                                ;;
                                                                                            esac
                                                                                            ;;
                                                                                        esac
                                                                                        ;;
                                                                                    esac
                                                                                    ;;
                                                                                esac
                                                                                ;;
                                                                            esac
                                                                            ;;
                                                                        esac
                                                                        ;;
                                                                    esac
                                                                    ;;
                                                                esac
                                                                ;;
                                                            esac
                                                            ;;
                                                        esac
                                                        ;;
                                                    esac
                                                    ;;
                                                esac
                                                ;;
                                            esac
                                            ;;
                                        esac
                                        ;;
                                    esac
                                    ;;
                                esac
                                ;;
                            esac
                            ;;
                        esac
                        ;;
                    esac
                    ;;
                esac
                ;;
            esac
            ;;
        esac
        ;;
    esac
  fi
])