#if !defined _PSARGS_H
#	define _PSARGS_H

/* pscat(1) and pspipe(1) arguments are flanked by { '[', '\0' } and
 * { ']', '\0' }. Nesting is allowed to facilitate nesting of pscat(1) and
 * pspipe(1). This checks to make sure grouping symbols in args are balanced.
 * args is the argv that was passed to main, incremented. l is the left
 * grouping character (usually '[') and r is the right grouping character
 * (usually ']').
 * Returns 0 in the events of a syntax error or there being no arguments.
 * Otherwise, returns the number of top-level right grouping arguments
 * (i.e. the number of terms). */
int check_arg(char **args, char l, char r);

/* arg is the location of the argument with the left grouping symbol within
 * argv, l is the left grouping character itself, r is the right grouping
 * character itself.
 * Returns the location of the argument with the corresponding left grouping
 * symbol within argv. */
char **corresponding_arg(char **arg, char l, char r);

#endif