split: support optional start value for --numeric-suffixes

Allow changing the --numeric-suffixes start number
from the default of 0.

* src/split.c (next_file_name): Initialize the suffix index
and the output filename according to start value.
(main): Check that the suffix length is large enough for the
numerical suffix start value.
* doc/coreutils.texi (split invocation): Mention it.
* NEWS (New features): Mention it.
* tests/split/numeric: New file. Test --numeric-suffixes[=FROM].
* tests/Makefile.am (TESTS): Reference the new test.

2 files changed, 66 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7b5368195..eed6ed624 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -259,6 +259,7 @@ TESTS =						\
   split/lines					\
   split/l-chunk					\
   split/r-chunk					\
+  split/numeric					\
   misc/stat-birthtime				\
   misc/stat-fmt					\
   misc/stat-hyphen				\
diff --git a/tests/split/numeric b/tests/split/numeric
new file mode 100755
index 000000000..ad22df621
--- /dev/null
+++ b/tests/split/numeric
@@ -0,0 +1,65 @@
+#!/bin/sh
+# Show that split --numeric-suffixes[=from] works.
+
+# Copyright (C) 2012 Free Software Foundation, Inc.
+
+# 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 3 of the License, or
+# (at your option) any later version.
+
+# This 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, see <http://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/init.sh"; path_prepend_ ../src
+print_ver_ split
+
+# Check default start from 0
+printf '1\n2\n3\n4\n5\n' > in || framework_failure_
+split --numeric-suffixes --lines=2 in || fail=1
+cat <<\EOF > exp-1
+1
+2
+EOF
+cat <<\EOF > exp-2
+3
+4
+EOF
+cat <<\EOF > exp-3
+5
+EOF
+compare exp-1 x00 || fail=1
+compare exp-2 x01 || fail=1
+compare exp-3 x02 || fail=1
+
+# Check --numeric-suffixes=X
+split --numeric-suffixes=1 --lines=2 in || fail=1
+cat <<\EOF > exp-1
+1
+2
+EOF
+cat <<\EOF > exp-2
+3
+4
+EOF
+cat <<\EOF > exp-3
+5
+EOF
+compare exp-1 x01 || fail=1
+compare exp-2 x02 || fail=1
+compare exp-3 x03 || fail=1
+
+# Check that split failed when suffix length is not large enough for
+# the numerical suffix start value
+split -a 3 --numeric-suffixes=1000 in 2> /dev/null && fail=1
+
+# check invalid --numeric-suffixes start values are flagged
+split --numeric-suffixes=-1 in 2> /dev/null && fail=1
+split --numeric-suffixes=one in 2> /dev/null && fail=1
+
+Exit $fail