Hi folks,
Under dash 0.5.12 parameter expansion using regexp classes [[:space:]] to trim
no longer works, but releases up to 0.5.11.5 still work correctly with the same
environment and default config options.
In the attached dash script and logs, one of our users has an abstruse string
they use to clean up build command lines, but I trimmed that down to the
locale-dependent [[:space:]] regexp, then to the ASCII whitespace characters
generated by echo, and only the last still works with 0.5.12, all work under
0.5.11.5.
Nothing obvious jumps out from the commitdiffs between then and now, so I am
hoping some possible cause occurs to you.
Build environment was Cygwin+newlib autoreconf with autoconf 2.71, autogen
5.18.16, automake 1.16.5, gcc 11.3, binutils 2.29, coreutils 9.0, dash 0.5.11.5
as sh.
--
Take care. Thanks, Brian Inglis Calgary, Alberta, Canada
La perfection est atteinte Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut
-- Antoine de Saint-Exupéry
#!/bin/dash -vx
trim() {
# remove leading whitespace characters
__trim="${*#${*%%[![:space:]]*}}"
# remove trailing whitespace characters
printf "%s" "${__trim%${__trim##*[![:space:]]}}"
}
trim " alpha" | od -t x1a
trim "beta " | od -t x1a
trim "
gamma " | od -t x1a
trim2() {
# remove leading whitespace characters
__trim="${*##[[:space:]]}"
# remove trailing whitespace characters
printf "%s" "${__trim%%[[:space:]]}"
}
trim2 " alpha" | od -t x1a
trim2 "beta " | od -t x1a
trim2 "
gamma " | od -t x1a
trim3() {
_space="$(echo -n '[\b\t\n\v\f\r ]')"
# remove leading whitespace characters
__trim="${*##$_space}"
# remove trailing whitespace characters
printf "%s" "${__trim%%$_space}"
}
trim3 " alpha" | od -t x1a
trim3 "beta " | od -t x1a
trim3 "
gamma " | od -t x1a
#!/bin/dash -vx
trim() {
# remove leading whitespace characters
__trim="${*#${*%%[![:space:]]*}}"
# remove trailing whitespace characters
printf "%s" "${__trim%${__trim##*[![:space:]]}}"
}
trim " alpha" | od -t x1a
+ trim alpha
+ __trim=alpha
+ printf %s alpha
+ od -t x1a
0000000 61 6c 70 68 61
a l p h a
0000005
trim "beta " | od -t x1a
+ trim beta
+ __trim=beta
+ printf %s beta
+ od -t x1a
0000000 62 65 74 61
b e t a
0000004
trim "
gamma " | od -t x1a
+ trim
gamma
+ __trim=gamma
+ printf %s gamma
+ od -t x1a
0000000 67 61 6d 6d 61
g a m m a
0000005
trim2() {
# remove leading whitespace characters
__trim="${*##[[:space:]]}"
# remove trailing whitespace characters
printf "%s" "${__trim%%[[:space:]]}"
}
trim2 " alpha" | od -t x1a
+ trim2 alpha
+ __trim=alpha
+ printf %s alpha
+ od -t x1a
0000000 61 6c 70 68 61
a l p h a
0000005
trim2 "beta " | od -t x1a
+ trim2 beta
+ __trim=beta
+ printf %s beta
+ od -t x1a
0000000 62 65 74 61
b e t a
0000004
trim2 "
gamma " | od -t x1a
+ trim2
gamma
+ __trim=gamma
+ printf %s gamma
+ od -t x1a
0000000 67 61 6d 6d 61
g a m m a
0000005
trim3() {
_space="$(echo -n '[\b\t\n\v\f\r ]')"
# remove leading whitespace characters
__trim="${*##$_space}"
# remove trailing whitespace characters
printf "%s" "${__trim%%$_space}"
}
trim3 " alpha" | od -t x1a
+ trim3 alpha
+ od -t x1a
+ echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=alpha
+ printf %s alpha
0000000 61 6c 70 68 61
a l p h a
0000005
trim3 "beta " | od -t x1a
+ trim3 beta
+ od -t x1a
+ echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=beta
+ printf %s beta
0000000 62 65 74 61
b e t a
0000004
trim3 "
gamma " | od -t x1a
+ trim3
gamma
+ + od -t x1a
echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=gamma
+ printf %s gamma
0000000 67 61 6d 6d 61
g a m m a
0000005
#!/bin/dash -vx
trim() {
# remove leading whitespace characters
__trim="${*#${*%%[![:space:]]*}}"
# remove trailing whitespace characters
printf "%s" "${__trim%${__trim##*[![:space:]]}}"
}
trim " alpha" | od -t x1a
+ trim alpha
+ __trim=
+ printf %s
+ od -t x1a
0000000
trim "beta " | od -t x1a
+ trim beta
+ __trim=
+ printf %s
+ od -t x1a
0000000
trim "
gamma " | od -t x1a
+ trim
gamma
+ __trim=
+ printf %s
+ od -t x1a
0000000
trim2() {
# remove leading whitespace characters
__trim="${*##[[:space:]]}"
# remove trailing whitespace characters
printf "%s" "${__trim%%[[:space:]]}"
}
trim2 " alpha" | od -t x1a
+ trim2 alpha
+ __trim= alpha
+ printf %s alpha
+ od -t x1a
0000000 20 61 6c 70 68 61
sp a l p h a
0000006
trim2 "beta " | od -t x1a
+ trim2 beta
+ __trim=beta
+ printf %s beta
+ od -t x1a
0000000 62 65 74 61 20
b e t a sp
0000005
trim2 "
gamma " | od -t x1a
+ trim2
gamma
+ __trim=
gamma
+ printf %s
gamma
+ od -t x1a
0000000 0d 67 61 6d 6d 61 09
cr g a m m a ht
0000007
trim3() {
_space="$(echo -n '[\b\t\n\v\f\r ]')"
# remove leading whitespace characters
__trim="${*##$_space}"
# remove trailing whitespace characters
printf "%s" "${__trim%%$_space}"
}
trim3 " alpha" | od -t x1a
+ trim3 alpha
+ od -t x1a
+ echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=alpha
+ printf %s alpha
0000000 61 6c 70 68 61
a l p h a
0000005
trim3 "beta " | od -t x1a
+ trim3 beta
+ od -t x1a
+ echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=beta
+ printf %s beta
0000000 62 65 74 61
b e t a
0000004
trim3 "
gamma " | od -t x1a
+ trim3
gamma
+ od -t x1a
+ echo -n [\b\t\n\v\f\r ]
+ _space=[
]
+ __trim=gamma
+ printf %s gamma
0000000 67 61 6d 6d 61
g a m m a
0000005
