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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2016-10-26 15:56:53 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2016-10-26 15:56:53 +0200 |
| commit | f15aa57a7f5edcbf3098873b8798c0ea7f496ed7 (patch) | |
| tree | 5641162328f080297bd9a27cf50730dbb3a8f604 /shell | |
| parent | e19923f6652a638ac39c84012e97f52cf5a7568e (diff) | |
| download | busybox-f15aa57a7f5edcbf3098873b8798c0ea7f496ed7.tar.gz | |
ash: [PARSER] Fix parsing of ${##1}
Upstream commit:
Date: Thu, 4 Oct 2007 22:15:10 +0800
[PARSER] Fix parsing of ${##1}
Previously dash treated ${##1} as a length operation. This patch fixes that.
Test case:
set -- a
echo ${##1}OK
Old result:
1OK
New result:
OK
This was a real bug in ash (but not in hush).
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/ash.c | 28 | ||||
| -rw-r--r-- | shell/ash_test/ash-vars/param_expand_len.right | 3 | ||||
| -rwxr-xr-x | shell/ash_test/ash-vars/param_expand_len.tests | 7 | ||||
| -rw-r--r-- | shell/hush_test/hush-vars/param_expand_len.right | 3 | ||||
| -rwxr-xr-x | shell/hush_test/hush-vars/param_expand_len.tests | 7 |
5 files changed, 38 insertions, 10 deletions
diff --git a/shell/ash.c b/shell/ash.c index b404449d0..2cebfe2c0 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -11728,16 +11728,9 @@ parsesub: { subtype = VSNORMAL; if (c == '{') { c = pgetc_eatbnl(); - if (c == '#') { - c = pgetc_eatbnl(); - if (c == '}') - c = '#'; /* ${#} - same as $# */ - else - subtype = VSLENGTH; /* ${#VAR} */ - } else { - subtype = 0; - } + subtype = 0; } + varname: if (c <= 255 /* not PEOA or PEOF */ && is_name(c)) { /* $[{[#]]NAME[}] */ do { @@ -11752,8 +11745,23 @@ parsesub: { } while (isdigit(c)); } else if (is_special(c)) { /* $[{[#]]<specialchar>[}] */ - USTPUTC(c, out); + int cc = c; + c = pgetc_eatbnl(); + if (!subtype && cc == '#') { + subtype = VSLENGTH; + if (c == '_' || isalnum(c)) + goto varname; + cc = c; + c = pgetc_eatbnl(); + if (cc == '}' || c != '}') { + pungetc(); + subtype = 0; + c = cc; + cc = '#'; + } + } + USTPUTC(cc, out); } else { goto badsub; } diff --git a/shell/ash_test/ash-vars/param_expand_len.right b/shell/ash_test/ash-vars/param_expand_len.right index 96e8cb59b..48d01d2fe 100644 --- a/shell/ash_test/ash-vars/param_expand_len.right +++ b/shell/ash_test/ash-vars/param_expand_len.right @@ -7,3 +7,6 @@ Make sure len parsing doesnt break arg count Testing len op 4 3 2 1 0 0 0 3 0 +Nothing: +Nothing: +One:1 diff --git a/shell/ash_test/ash-vars/param_expand_len.tests b/shell/ash_test/ash-vars/param_expand_len.tests index fe20a45e9..369c8d456 100755 --- a/shell/ash_test/ash-vars/param_expand_len.tests +++ b/shell/ash_test/ash-vars/param_expand_len.tests @@ -15,3 +15,10 @@ unset e f=abc g= echo ${#e} ${#f} ${#g} + +set -- a +# This must be interpreted as: $# ("1"), then remove trailing "1". +# IOW: empty result. +echo Nothing:${##1} +echo Nothing:${#%1} +echo One:${##x} diff --git a/shell/hush_test/hush-vars/param_expand_len.right b/shell/hush_test/hush-vars/param_expand_len.right index 96e8cb59b..48d01d2fe 100644 --- a/shell/hush_test/hush-vars/param_expand_len.right +++ b/shell/hush_test/hush-vars/param_expand_len.right @@ -7,3 +7,6 @@ Make sure len parsing doesnt break arg count Testing len op 4 3 2 1 0 0 0 3 0 +Nothing: +Nothing: +One:1 diff --git a/shell/hush_test/hush-vars/param_expand_len.tests b/shell/hush_test/hush-vars/param_expand_len.tests index fe20a45e9..369c8d456 100755 --- a/shell/hush_test/hush-vars/param_expand_len.tests +++ b/shell/hush_test/hush-vars/param_expand_len.tests @@ -15,3 +15,10 @@ unset e f=abc g= echo ${#e} ${#f} ${#g} + +set -- a +# This must be interpreted as: $# ("1"), then remove trailing "1". +# IOW: empty result. +echo Nothing:${##1} +echo Nothing:${#%1} +echo One:${##x} |