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Diffstat (limited to '')
| -rw-r--r-- | examples/functions/isnum2 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/examples/functions/isnum2 b/examples/functions/isnum2 new file mode 100644 index 0000000..583e374 --- /dev/null +++ b/examples/functions/isnum2 @@ -0,0 +1,41 @@ +# +# Chet Ramey <chet.ramey@case.edu> +# +# Copyright 1998 Chester Ramey +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2, or (at your option) +# any later version. +# +# TThis program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program; if not, write to the Free Software Foundation, +# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +isnum2() +{ + case "$1" in + '[-+]' | '') return 1;; # empty or bare `-' or `+' + [-+]*[!0-9]*) return 1;; # non-digit with leading sign + [-+]*) return 0;; # OK + *[!0-9]*) return 1;; # non-digit + *) return 0;; # OK + esac +} + +# this one handles floating point +isnum3() +{ + case "$1" in + '') return 1;; # empty + *[!0-9.+-]*) return 1;; # non-digit, +, -, or . + *?[-+]*) return 1;; # sign as second or later char + *.*.*) return 1;; # multiple decimal points + *) return 0;; # OK + esac +} |