test-lib-functions.sh: add generate_zero_bytes function
t5318 and t5562 used /dev/zero, which is not portable. This function
provides both a fixed block of NUL bytes and an infinite stream of NULs.
Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 92cf8f8..bbf6871 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -116,6 +116,19 @@
tr '\015' Q | sed -e 's/Q$//'
}
+# Generate an output of $1 bytes of all zeroes (NULs, not ASCII zeroes).
+# If $1 is 'infinity', output forever or until the receiving pipe stops reading,
+# whichever comes first.
+generate_zero_bytes () {
+ perl -e 'if ($ARGV[0] == "infinity") {
+ while (-1) {
+ print "\0"
+ }
+ } else {
+ print "\0" x $ARGV[0]
+ }' "$@"
+}
+
# In some bourne shell implementations, the "unset" builtin returns
# nonzero status when a variable to be unset was not set in the first
# place.
