STROPT(3)

NAME
stropt - table driven option expression evaluator

SYNOPSIS

DESCRIPTION
stropt parses option expressions in the nul-terminated string s using the option names in tab. tab is an array of struct namval name value pairs:
    char*	name;
    int	value;
The last entry must be followed by a sentinel with name set to 0.

An option expression contains 0 or more of [no]name[=value] separate by space or tab, where name must be one of the option names in tab, value is an optional value, and no is for Boolean options. Each option is passed to fun for processing. a is the pointer that is passed from the stropt call but is otherwise not interpreted. p points to the option name value pair from tab. n is 0 if no preceeded the option name and v points to the beginning of the option value in s. and If name is not found in tab then fun is called with p pointing to an internal namval entry with p->name pointing to the unknown option and p->value set to the value of the sentinel entry in tab.

If fun returns non-zero then this value is returned and no further options are processed. Otherwise stropt returns 0 after processing all options.