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m_option: fix braindead --start, --length, --end option parsing bugs

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The option type m_option_type_rel_time was completely broken. It
interpreted everything starting with a number as percent position. This
is because sscanf() semantics are idiotic (trailing string doesn't need
to be matched), and due to my own idiocy this was overlooked when
testing. Fix by considering sscanf() evil and not using it.
(bstr_sscanf() is a straight wrapper around sscanf()).

Even if the percent code was fixed, there was another bug: it always
interpreted times as negative (starting from end for --start). Fix the
basic logic.
This commit is contained in:
wm4 2012-11-18 00:19:43 +01:00
parent af8ded53db
commit 39428525c3
1 changed files with 4 additions and 4 deletions
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8
core/m_option.c
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@ -1259,16 +1259,16 @@ static int parse_rel_time(const m_option_t *opt, struct bstr name,
return M_OPT_MISSING_PARAM;
// Percent pos
double percent;
if (bstr_sscanf(param, "%lf%%", &percent) == 1) {
if (percent >= 0 && percent <= 100) {
if (bstr_endswith0(param, "%")) {
double percent = bstrtod(bstr_splice(param, 0, -1), &param);
if (param.len == 0 && percent >= 0 && percent <= 100) {
t.type = REL_TIME_PERCENT;
t.pos = percent;
goto out;
}
}
double sign = bstr_eatstart0(&param, "-") ? -1 : +1;
bool sign = bstr_eatstart0(&param, "-");
double time;
if (parse_timestring(param, &time, 0)) {
t.type = sign ? REL_TIME_NEGATIVE : REL_TIME_ABSOLUTE;