1#!/bin/sh
2# Ensure sort -g sorts floating point limits correctly
3
4# Copyright (C) 2010-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ sort
21
22# Return 0 if LDBL_MIN is smaller than DBL_MIN, else 1.
23# Dissect numbers like these, comparing first exponent, then
24# whole part of mantissa, then fraction, until finding enough
25# of a difference to determine the relative order of the numbers.
26# These are "reversed":
27#   $ ./getlimits |grep DBL_MIN
28#   DBL_MIN=2.225074e-308
29#   LDBL_MIN=2.004168e-292
30#
31# These are in the expected order:
32#   $ ./getlimits|grep DBL_MIN
33#   DBL_MIN=2.225074e-308
34#   LDBL_MIN=3.362103e-4932
35
36dbl_minima_order()
37{
38  LC_ALL=C getlimits_
39  set -- $(echo $LDBL_MIN | tr .e- '   ')
40  local ldbl_whole=$1 ldbl_frac=$2 ldbl_exp=$3
41
42  set -- $(echo $DBL_MIN |tr .e- '   ')
43  local dbl_whole=$1 dbl_frac=$2 dbl_exp=$3
44
45  test "$dbl_exp"    -lt "$ldbl_exp"   && return 0
46  test "$ldbl_exp"   -lt "$dbl_exp"    && return 1
47  test "$ldbl_whole" -lt "$dbl_whole"  && return 0
48  test "$dbl_whole"  -lt "$ldbl_whole" && return 1
49  test "$ldbl_frac"  -le "$dbl_frac"   && return 0
50  return 1
51}
52
53# On some systems, DBL_MIN < LDBL_MIN.  Detect that.
54dbl_minima_order; reversed=$?
55
56for LOC in C $LOCALE_FR; do
57
58  LC_ALL=$LOC getlimits_
59
60  # If DBL_MIN happens to be smaller than LDBL_MIN, swap them,
61  # so that out expected output is sorted.
62  if test $reversed = 1; then
63    t=$LDBL_MIN
64    LDBL_MIN=$DBL_MIN
65    DBL_MIN=$t
66  fi
67
68  printf -- "\
69-$LDBL_MAX
70-$DBL_MAX
71-$FLT_MAX
72-$FLT_MIN
73-$DBL_MIN
74-$LDBL_MIN
750
76$LDBL_MIN
77$DBL_MIN
78$FLT_MIN
79$FLT_MAX
80$DBL_MAX
81$LDBL_MAX
82" |
83  grep '^[0-9.,e+-]*$' > exp # restrict to numeric just in case
84
85  tac exp | LC_ALL=$LOC sort -sg > out || fail=1
86
87  compare exp out || fail=1
88done
89
90Exit $fail
91