29 struct s s(const char *s1)  in s()  argument
33 	if (!s1)  in s()
36 	s.s = malloc(strlen(s1) + 1);  in s()
40 	strcpy(s.s, s1);  in s()
44 struct s sn(const char *s1, const char *s2)  in sn()  argument
48 	if (!s1)  in sn()
51 	s.s = malloc(s2 - s1 + 1);  in sn()
55 	strncpy(s.s, s1, s2 - s1);  in sn()
56 	s.s[s2 - s1] = 0;  in sn()
60 int s_cmp(struct s s1, struct s s2)  in s_cmp()  argument
64 	if (!s1.s || !s2.s)  in s_cmp()
66 	result = strcmp(s1.s, s2.s);  in s_cmp()
68 	free(s1.s);  in s_cmp()
73 struct s s_cat(struct s s1, struct s s2)  in s_cat()  argument
77 	if (!s1.s || !s2.s)  in s_cat()
80 	s.s = malloc(strlen(s1.s) + strlen(s2.s) + 1);  in s_cat()
84 	strcpy(s.s, s1.s);  in s_cat()
87 	free(s1.s);  in s_cat()
92 struct s s_splitleft(struct s s1, char c)  in s_splitleft()  argument
97 	if (!s1.s)  in s_splitleft()
100 	split = strchr(s1.s, c);  in s_splitleft()
102 		s = sn(s1.s, split);  in s_splitleft()
104 	free(s1.s);  in s_splitleft()
108 struct s s_splitright(struct s s1, char c)  in s_splitright()  argument
113 	if (!s1.s)  in s_splitright()
116 	split = strchr(s1.s, c);  in s_splitright()
120 	free(s1.s);  in s_splitright()
124 struct s s_word(struct s s1, char c, size_t n)  in s_word()  argument
127 		s1 = s_splitright(s1, c);  in s_word()
128 	return s_splitleft(s1, c);  in s_word()
131 struct s s_path(struct s s1, struct s s2)  in s_path()  argument
133 	return s_cat(s_cat(s1, s("/")), s2);  in s_path()
136 struct s s_pathn(size_t n, struct s s1, ...)  in s_pathn()  argument
140 	va_start(argp, s1);  in s_pathn()
142 		s1 = s_path(s1, va_arg(argp, struct s));  in s_pathn()
144 	return s1;  in s_pathn()