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hush: fix handling of \" in quoted/unquoted cmd

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Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2010-09-12 15:05:39 +02:00
parent 958581a8d9
commit acd5bc8f64
5 changed files with 50 additions and 22 deletions
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48
shell/hush.c
View File

@ -234,6 +234,10 @@
//usage:#define hush_full_usage ""
//usage:#define msh_trivial_usage NOUSAGE_STR
//usage:#define msh_full_usage ""
//usage:#define sh_trivial_usage NOUSAGE_STR
//usage:#define sh_full_usage ""
//usage:#define bash_trivial_usage NOUSAGE_STR
//usage:#define bash_full_usage ""
/* Build knobs */
@ -1367,9 +1371,15 @@ static void hush_exit(int exitcode)
#endif
}
static int check_and_run_traps(int sig)
{
static const struct timespec zero_timespec;
/* I want it in rodata, not in bss.
* gcc 4.2.1 puts it in rodata only if it has { 0, 0 }
* initializer. But other compilers may still use bss.
* TODO: find more portable solution.
*/
static const struct timespec zero_timespec = { 0, 0 };
smalluint save_rcode;
int last_sig = 0;
@ -3367,7 +3377,7 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
/* Subroutines for copying $(...) and `...` things */
static void add_till_backquote(o_string *dest, struct in_str *input);
static void add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
/* '...' */
static void add_till_single_quote(o_string *dest, struct in_str *input)
{
@ -3399,7 +3409,7 @@ static void add_till_double_quote(o_string *dest, struct in_str *input)
}
o_addchr(dest, ch);
if (ch == '`') {
add_till_backquote(dest, input);
add_till_backquote(dest, input, /*in_dquote:*/ 1);
o_addchr(dest, ch);
continue;
}
@ -3420,26 +3430,26 @@ static void add_till_double_quote(o_string *dest, struct in_str *input)
* Example Output
* echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
*/
static void add_till_backquote(o_string *dest, struct in_str *input)
static void add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch('`');
/*xfunc_die(); - redundant */
}
if (ch == '`')
return;
if (ch == '\\') {
/* \x. Copy both chars unless it is \` */
int ch2 = i_getch(input);
if (ch2 == EOF) {
syntax_error_unterm_ch('`');
/*xfunc_die(); - redundant */
/* \x. Copy both unless it is \`, \$, \\ and maybe \" */
ch = i_getch(input);
if (ch != '`'
&& ch != '$'
&& ch != '\\'
&& (!in_dquote || ch != '"')
) {
o_addchr(dest, '\\');
}
if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
o_addchr(dest, ch);
ch = ch2;
}
if (ch == EOF) {
syntax_error_unterm_ch('`');
/*xfunc_die(); - redundant */
}
o_addchr(dest, ch);
}
@ -3504,7 +3514,7 @@ static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsign
continue;
}
if (ch == '`') {
add_till_backquote(dest, input);
add_till_backquote(dest, input, /*in_dquote:*/ 0);
o_addchr(dest, ch);
continue;
}
@ -3818,7 +3828,7 @@ static int encode_string(o_string *as_string,
//unsigned pos = dest->length;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, 0x80 | '`');
add_till_backquote(dest, input);
add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"');
o_addchr(dest, SPECIAL_VAR_SYMBOL);
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
goto again;
@ -4191,7 +4201,7 @@ static struct pipe *parse_stream(char **pstring,
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
o_addchr(&dest, '`');
pos = dest.length;
add_till_backquote(&dest, input);
add_till_backquote(&dest, input, /*in_dquote:*/ 0);
# if !BB_MMU
o_addstr(&ctx.as_string, dest.data + pos);
o_addchr(&ctx.as_string, '`');

8
shell/hush_test/hush-misc/heredoc_backslash1.right
View File

@ -5,6 +5,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-')
c\
Unquoted heredoc:
@ -13,6 +15,8 @@ a\
b
123456 -qwerty-\t-\-\"-\'-`-\--\z-\*-\?-
-qwerty-\t-\-\"-\'-`-\--\z-\*-\?-
123456 v-$a-\t-\-\"-\x-`-\--\z-\*-\?-
123456 v-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-
cEOF2
Quoted -heredoc:
@ -22,6 +26,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-')
c\
Unquoted -heredoc:
@ -30,6 +36,8 @@ a\
b
123456 -qwerty-\t-\-\"-\'-`-\--\z-\*-\?-
-qwerty-\t-\-\"-\'-`-\--\z-\*-\?-
123456 v-$a-\t-\-\"-\x-`-\--\z-\*-\?-
123456 v-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-
cEOF4
Done: 0

8
shell/hush_test/hush-misc/heredoc_backslash1.tests
View File

@ -11,6 +11,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-')
c\
EOF1
echo
@ -23,6 +25,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-')
c\
EOF2
EOF2
@ -36,6 +40,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-')
c\
EOF3
# In -heredoc case the marker is detected even if it is indented.
@ -49,6 +55,8 @@ a\\
b
123456 -$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
-$a-\t-\\-\"-\'-\`-\--\z-\*-\?-
123456 `echo v'-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-'`
123456 $(echo v'-$a-\t-\\-\"-\x-\`-\--\z-\*-\?-')
c\
EOF4
EOF4

2
shell/hush_test/hush-psubst/tick3.right
View File

@ -2,5 +2,5 @@
$TEST
Q
a\bc
a"c
11-$a-\t-\-\"-`-\--\z-\*-\?-22 33-$a-\t-\-"-`-\--\z-\*-\?-44
done:0

6
shell/hush_test/hush-psubst/tick3.tests
View File

@ -7,6 +7,8 @@ echo `echo '\'TEST\`echo ZZ\`BEST`
echo `echo \\$TEST`
echo `echo \$TEST`
echo a`echo \\\\b`c
# \" etc are NOT special (passed verbatim WITH \)!
echo a`echo \"`c
# \" is not special if in unquoted `cmd` (passed verbatim WITH \),
# but is special in quoted one
echo `echo 11'-$a-\t-\\-\"-\`-\--\z-\*-\?-'22` "`echo 33'-$a-\t-\\-\"-\`-\--\z-\*-\?-'44`"
echo done:$?