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hush: fix some fallout from prev commits, add testsuite

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This commit is contained in:
Denis Vlasenko 2008-06-10 18:06:24 +00:00
parent 46ccdcb96e
commit 895bea2303
3 changed files with 31 additions and 12 deletions
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33
shell/hush.c
View File

@ -1234,11 +1234,14 @@ static void o_addqchr(o_string *o, int ch, int quote)
static int o_save_ptr(o_string *o, int n)
{
char **list = (char**)o->data;
int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
int string_len = o->length - string_start;
int string_start;
int string_len;
if (!o->has_empty_slot) {
string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
string_len = o->length - string_start;
if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
//bb_error_msg("list[%d]=%d string_start=%d (growing)", n, string_len, string_start);
/* list[n] points to string_start, make space for 16 more pointers */
o->maxlen += 0x10 * sizeof(list[0]);
o->data = xrealloc(o->data, o->maxlen + 1);
@ -1246,8 +1249,12 @@ static int o_save_ptr(o_string *o, int n)
memmove(list + n + 0x10, list + n, string_len);
o->length += 0x10 * sizeof(list[0]);
}
//else bb_error_msg("list[%d]=%d string_start=%d", n, string_len, string_start);
} else {
/* We have empty slot at list[n], reuse without growth */
string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
string_len = o->length - string_start;
//bb_error_msg("list[%d]=%d string_start=%d (empty slot)", n, string_len, string_start);
o->has_empty_slot = 0;
}
list[n] = (char*)string_len;
@ -2684,18 +2691,20 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
arg = ++p;
} /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
o_debug_list("expand_vars_to_list[a]", output, n);
o_addstr(output, arg, strlen(arg) + 1);
o_debug_list("expand_vars_to_list[b]", output, n);
//TESTME
if (output->length - 1 == o_get_last_ptr(output, n)) { /* expansion is empty */
if (!(ored_ch & 0x80)) { /* all vars were not quoted... */
n--;
/* allow to reuse list[n] later without re-growth */
output->has_empty_slot = 1;
{
int len = strlen(arg);
if (len) {
o_debug_list("expand_vars_to_list[a]", output, n);
o_addstr(output, arg, len + 1);
o_debug_list("expand_vars_to_list[b]", output, n);
} else if (output->length == o_get_last_ptr(output, n)) { /* expansion is empty */
if (!(ored_ch & 0x80)) { /* all vars were not quoted... */
n--;
/* allow to reuse list[n] later without re-growth */
output->has_empty_slot = 1;
}
}
}
return n;
}

3
shell/hush_test/hush-vars/empty.right Normal file
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@ -0,0 +1,3 @@
a b c d e f 1 2 3 4 5 6 7 8 9 0 A B C D E F
a b c d e f 1 2 3 4 5 6 7 8 9 0 A B C D E F
a b c d e f 1 2 3 4 5 6 7 8 9 0 A B C D E F

7
shell/hush_test/hush-vars/empty.tests Executable file
View File

@ -0,0 +1,7 @@
#!/bin/sh
e=
echo a b c d e f 1 2 3 4 5 6 7 8 9 0 A B C D E F
echo a $e b $e c $e d $e e $e f $e 1 $e 2 $e 3 $e 4 $e 5 $e 6 $e 7 $e 8 $e 9 $e 0 $e A $e B $e C $e D $e E $e F
echo $e a $e b $e c $e d $e e $e f $e 1 $e 2 $e 3 $e 4 $e 5 $e 6 $e 7 $e 8 $e 9 $e 0 $e A $e B $e C $e D $e E $e F