mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-01 07:01:54 +00:00
65 lines
1.8 KiB
Awk
65 lines
1.8 KiB
Awk
# Generate random path-like strings, separated by null characters.
|
|
#
|
|
# Invocation:
|
|
#
|
|
# awk -f ./generate.awk -v <variable>=<value> | tr '\0' '\n'
|
|
#
|
|
# Customizable variables (all default to 0):
|
|
# - seed: Deterministic random seed to use for generation
|
|
# - count: Number of paths to generate
|
|
# - extradotweight: Give extra weight to dots being generated
|
|
# - extraslashweight: Give extra weight to slashes being generated
|
|
# - extranullweight: Give extra weight to null being generated, making paths shorter
|
|
BEGIN {
|
|
# Random seed, passed explicitly for reproducibility
|
|
srand(seed)
|
|
|
|
# Don't include special characters below 32
|
|
minascii = 32
|
|
# Don't include DEL at 128
|
|
maxascii = 127
|
|
upperascii = maxascii - minascii
|
|
|
|
# add extra weight for ., in addition to the one weight from the ascii range
|
|
upperdot = upperascii + extradotweight
|
|
|
|
# add extra weight for /, in addition to the one weight from the ascii range
|
|
upperslash = upperdot + extraslashweight
|
|
|
|
# add extra weight for null, indicating the end of the string
|
|
# Must be at least 1 to have strings end at all
|
|
total = upperslash + 1 + extranullweight
|
|
|
|
# new=1 indicates that it's a new string
|
|
new=1
|
|
while (count > 0) {
|
|
|
|
# Random integer between [0, total)
|
|
value = int(rand() * total)
|
|
|
|
if (value < upperascii) {
|
|
# Ascii range
|
|
printf("%c", value + minascii)
|
|
new=0
|
|
|
|
} else if (value < upperdot) {
|
|
# Dot range
|
|
printf "."
|
|
new=0
|
|
|
|
} else if (value < upperslash) {
|
|
# If it's the start of a new path, only generate a / in 10% of cases
|
|
# This is always an invalid subpath, which is not a very interesting case
|
|
if (new && rand() > 0.1) continue
|
|
printf "/"
|
|
|
|
} else {
|
|
# Do not generate empty strings
|
|
if (new) continue
|
|
printf "\x00"
|
|
count--
|
|
new=1
|
|
}
|
|
}
|
|
}
|