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ash: match bash behavior for ${empty_var/*/repl}

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2021-01-09 08:46:54 +01:00
parent 883cdb79a4
commit 2b7c1aa92c
2 changed files with 4 additions and 4 deletions
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6
shell/ash.c
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@ -7178,7 +7178,7 @@ subevalvar(char *start, char *str, int strloc,
len = 0;
idx = startp;
end = str - 1;
while (idx < end) {
while (idx <= end) {
try_to_match:
loc = scanright(idx, rmesc, rmescend, str, quotes, 1);
//bb_error_msg("scanright('%s'):'%s'", str, loc);
@ -7186,6 +7186,8 @@ subevalvar(char *start, char *str, int strloc,
/* No match, advance */
char *restart_detect = stackblock();
skip_matching:
if (idx >= end)
break;
STPUTC(*idx, expdest);
if (quotes && (unsigned char)*idx == CTLESC) {
idx++;
@ -7198,8 +7200,6 @@ subevalvar(char *start, char *str, int strloc,
len++;
rmesc++;
/* continue; - prone to quadratic behavior, smarter code: */
if (idx >= end)
break;
if (str[0] == '*') {
/* Pattern is "*foo". If "*foo" does not match "long_string",
* it would never match "ong_string" etc, no point in trying.

2
shell/ash_test/ash-vars/var_bash_repl_empty_var.right
View File

@ -1,3 +1,3 @@
w
Ok:0