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-rw-r--r--shell/ash.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/shell/ash.c b/shell/ash.c
index 705fe9fa4..90fb00fbd 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -6411,7 +6411,15 @@ subevalvar(char *p, char *varname, int strloc, int subtype,
len = number(loc);
}
}
- if (pos >= orig_len) {
+ if (pos < 0) {
+ /* ${VAR:$((-n)):l} starts n chars from the end */
+ pos = orig_len + pos;
+ }
+ if ((unsigned)pos >= orig_len) {
+ /* apart from obvious ${VAR:999999:l},
+ * covers ${VAR:$((-9999999)):l} - result is ""
+ * (bash-compat)
+ */
pos = 0;
len = 0;
}