# split.awk --- do split in awk
#
# Requires ord() and chr() library functions
#
# Arnold Robbins, [email protected], Public Domain
# May 1993

# usage: split [-num] [file] [outname]

BEGIN {
outfile = "x" # default
count = 1000
if (ARGC > 4)
usage()

i = 1
if (ARGV[i] ~ /^-[[:digit:]]+$/) {
count = -ARGV[i]
ARGV[i] = ""
i++
}
# test argv in case reading from stdin instead of file
if (i in ARGV)
i++ # skip data file name
if (i in ARGV) {
outfile = ARGV[i]
ARGV[i] = ""
}

s1 = s2 = "a"
out = (outfile s1 s2)
}
{
if (++tcount > count) {
close(out)
if (s2 == "z") {
if (s1 == "z") {
printf("split: %s is too large to split\n",
FILENAME) > "/dev/stderr"
exit 1
}
s1 = chr(ord(s1) + 1)
s2 = "a"
}
else
s2 = chr(ord(s2) + 1)
out = (outfile s1 s2)
tcount = 1
}
print > out
}
function usage( e)
{
e = "usage: split [-num] [file] [outname]"
print e > "/dev/stderr"
exit 1
}