63 initarg(struct arglist *al)  in initarg()  argument
65 	al->argc = 0;  in initarg()
66 	al->maxc = 10;  in initarg()
67 	if ((al->argv = calloc(al->maxc, sizeof(char *))) == NULL)  in initarg()
72 addarg(struct arglist *al, const char *arg)  in addarg()  argument
75 	if (al->argc == al->maxc) {  in addarg()
76 		al->maxc <<= 1;  in addarg()
77 		al->argv = realloc(al->argv, al->maxc * sizeof(char *));  in addarg()
78 		if (al->argv == NULL)  in addarg()
82 		al->argv[al->argc++] = NULL;  in addarg()
83 	else if ((al->argv[al->argc++] = strdup(arg)) == NULL)  in addarg()
97 	struct arglist al;  in main()  local
103 	initarg(&al);  in main()
104 	addarg(&al, argv[0]);  in main()
118 			addarg(&al, NULL);  in main()
122 			execve(_PATH_DEFAULTMTA, al.argv, envp);  in main()
163 				    addarg(&al, ap);  in main()
174 		addarg(&al, argv[i]);  in main()
176 	addarg(&al, NULL);  in main()
177 	execve(to, al.argv, envp);  in main()