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ash: fix handling of negative start value in ${v:start:len}

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function                                             old     new   delta
subevalvar                                          1140    1168     +28

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2014-11-17 20:27:18 +01:00
parent 1a1143907c
commit 08a5dab181
1 changed files with 9 additions and 1 deletions
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10
shell/ash.c
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@ -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;
}