From 3fbacb1f5c5eab1727d0bed0bd50d659af854ec7 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Mon, 5 Jul 2021 00:57:46 -0500
Subject: Add split -n test, handle more than one leftover byte, clarify help
 text.

---
 tests/split.test   | 18 +++++++++++-------
 toys/posix/split.c | 14 ++++----------
 2 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/tests/split.test b/tests/split.test
index 4a522432..57270ffa 100755
--- a/tests/split.test
+++ b/tests/split.test
@@ -5,21 +5,21 @@
 #testing "name" "command" "result" "infile" "stdin"
 
 testing "split" "seq 1 12345 | split && ls xa[a-z] | wc -l" "13\n" "" ""
-rm xa[a-z]
+rm -f xa[a-z]
 
 testing "-" "seq 1 12345 | split - && ls xa[a-z] | wc -l" "13\n" "" ""
-rm xa[a-z]
+rm -f xa[a-z]
 
 seq 1 12345 > file
 testing "file" "split file && ls xa[a-z] | wc -l" "13\n" "" ""
-rm xa[a-z]
+rm -f xa[a-z]
 
-testing "-l" "split file -l 10k && wc -l xab" "2105 xab\n" "" ""
-rm xa[ab]
+toyonly testing "-l" "split file -l 10k && wc -l xab" "2105 xab\n" "" ""
+rm -f xa[ab]
 
 testing "suffix exhaustion" \
   "split file -l 10 -a 1 walrus 2>/dev/null || ls walrus* | wc -l" "26\n" "" ""
-rm walrus*
+rm -f walrus*
 
 testing "bytes" \
   "seq 1 20000 | split -b 100 -a 3 - whang && ls whang* | wc -l && wc -c whangbpw" "1089\n94 whangbpw\n" "" ""
@@ -27,5 +27,9 @@ testing "bytes" \
 testing "reassembly" \
   'ls whang* | sort | xargs cat > reassembled && seq 1 20000 | diff -u reassembled - && echo yes' \
   "yes\n" "" ""
+rm -f file whang* reassembled
+
+testing "-n" "split -n 3 input; md5sum xaa xab xac" \
+  "494bb8fb423bfa1a5fd66dd0b98f866d  xaa\n449acfdbc692780de30a2df05c5d32aa  xab\n15ab4be57aebe9a1e445195d5094036c  xac\n" \
+  "$(seq 1 10000)" ""
 
-rm file whang* reassembled
diff --git a/toys/posix/split.c b/toys/posix/split.c
index 5161affb..293343bf 100644
--- a/toys/posix/split.c
+++ b/toys/posix/split.c
@@ -22,7 +22,7 @@ config SPLIT
     -a	Suffix length (default 2)
     -b	BYTES/file (10, 10k, 10m, 10g...)
     -l	LINES/file (default 1000)
-    -n	PARTS
+    -n	PARTS many equal length files
 */
 
 #define FOR_split
@@ -42,14 +42,10 @@ static void do_split(int infd, char *in)
 
   // posix doesn't cover permissions on output file, so copy input (or 0777)
   st.st_mode = 0777;
+  st.st_size = 0;
   fstat(infd, &st);
 
-  if (!TT.b && TT.n) {
-    if (lseek(infd, 0, SEEK_CUR) < 0)
-      error_exit("cannot determine file size");
-    TT.b = st.st_size / TT.n;
-  }
-
+  if (TT.n && (TT.b = st.st_size/TT.n)<1) return error_msg("%s: no size", in);
   len = pos = filenum = bytesleft = linesleft = 0;
   for (;;) {
     int i, j;
@@ -70,9 +66,7 @@ static void do_split(int infd, char *in)
         j /= 26;
       }
       if (j) error_exit("bad suffix");
-      bytesleft = TT.b;
-      if (TT.n && filenum == TT.n && st.st_size % 2)
-          ++bytesleft;
+      bytesleft = TT.b + ((filenum == TT.n) ? st.st_size%TT.n : 0);
       linesleft = TT.l;
       xclose(outfd);
       outfd = xcreate(TT.outfile, O_RDWR|O_CREAT|O_TRUNC, st.st_mode & 0777);
-- 
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