Hello https://man7.org/linux/man-pages/man3/argz_create.3.html BUGS top Argz vectors without a terminating null byte may lead to Segmentation Faults. Doesn't feel like this is a BUG to me. Is there a better section to add this? Almost all string handling functions may cause SEGV if passed a string without a null byte. Or even being passed a NULL ptr like strlen(NULL).. I expect some of these may crash if passed NULL. May I ask if there is a way to link error_t to the definition, should be in errno.h Kind regards Jonny