lib9p: Don't nul-terminate strings, add some string utils

1 files changed, 29 insertions, 0 deletions

diff --git a/lib9p/9p.c b/lib9p/9p.c
index de6f05b..5bea9f9 100644
--- a/lib9p/9p.c
+++ b/lib9p/9p.c
@@ -35,6 +35,35 @@ const char *lib9p_msgtype_str(enum lib9p_version ver, enum lib9p_msg_type typ) {
 	return _lib9p_table_msg_name[ver][typ] ?: const_byte_str(typ);
 }
 
+struct lib9p_s lib9p_str(char *s) {
+	if (!s)
+		return (struct lib9p_s){0};
+	return (struct lib9p_s){
+		.len = strlen(s),
+		.utf8 = s,
+	};
+}
+struct lib9p_s lib9p_strn(char *s, size_t maxlen) {
+	if (maxlen == 0 || !s)
+		return (struct lib9p_s){0};
+	return (struct lib9p_s){
+		.len = strnlen(s, maxlen),
+		.utf8 = s,
+	};
+}
+struct lib9p_s lib9p_str_slice(struct lib9p_s s, uint16_t beg, uint16_t end) {
+	assert(s.len == 0 || s.utf8);
+	assert(beg <= end && end <= s.len);
+	return (struct lib9p_s){
+		.len = end - beg,
+		.utf8 = &s.utf8[beg],
+	};
+}
+bool lib9p_str_eq(struct lib9p_s a, struct lib9p_s b) {
+	return a.len == b.len &&
+		(a.len == 0 || memcmp(a.utf8, b.utf8, a.len) == 0);
+}
+
 /* ctx ************************************************************************/
 
 void lib9p_ctx_clear_error(struct lib9p_ctx *ctx) {