+
+
+
+int rb_fsnprint(char *buf, size_t len, const rb_strf_t *strings)
+{
+ size_t used = 0;
+ size_t remaining = len;
+
+ while (strings != NULL) {
+ int ret = 0;
+
+ if (strings->length != 0) {
+ remaining = strings->length;
+ if (remaining > len - used)
+ remaining = len - used;
+ }
+
+ if (remaining == 0)
+ break;
+
+ if (strings->format != NULL) {
+ if (strings->format_args != NULL) {
+ ret = vsnprintf(buf + used, remaining,
+ strings->format, *strings->format_args);
+ } else {
+ ret = rb_strlcpy(buf + used,
+ strings->format, remaining);
+ }
+ } else if (strings->func != NULL) {
+ ret = strings->func(buf + used, remaining,
+ strings->func_args);
+ }
+
+ if (ret < 0) {
+ return ret;
+ } else if ((size_t)ret > remaining - 1) {
+ used += remaining - 1;
+ } else {
+ used += ret;
+ }
+
+ if (used >= len - 1) {
+ used = len - 1;
+ break;
+ }
+
+ remaining -= ret;
+ strings = strings->next;
+ }
+
+ return used;
+}
+
+int rb_fsnprintf(char *buf, size_t len, const rb_strf_t *strings, const char *format, ...)
+{
+ va_list args;
+ rb_strf_t prepend_string = { .format = format, .format_args = &args, .next = strings };
+ int ret;
+
+ va_start(args, format);
+ ret = rb_fsnprint(buf, len, &prepend_string);
+ va_end(args);
+
+ return ret;
+}
+