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spa: json: propagate parse error in spa_json_container_len

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Successful return is always >= 2 since it includes {} or [], so use 0 to
indicate error.

Since there's existing code that doesn't check the return value, it's
better to use 0 for errors as it'll likely to just lead to producing an
empty string if the value is not checked.
This commit is contained in:
Pauli Virtanen 2024-03-20 20:40:05 +02:00
parent 31e5823010
commit f45d89b75b
1 changed files with 9 additions and 1 deletions
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10
spa/include/spa/utils/json.h
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@ -281,12 +281,20 @@ static inline int spa_json_is_container(const char *val, int len)
return len > 0 && (*val == '{' || *val == '[');
}
/**
* Return length of container at current position, starting at \a value.
*
* \return Length of container including {} or [], or 0 on error.
*/
static inline int spa_json_container_len(struct spa_json *iter, const char *value, int len SPA_UNUSED)
{
const char *val;
struct spa_json sub;
int res;
spa_json_enter(iter, &sub);
while (spa_json_next(&sub, &val) > 0);
while ((res = spa_json_next(&sub, &val)) > 0);
if (res < 0)
return 0;
return sub.cur + 1 - value;
}