more helper functions

uttt.c

@@ -13,6 +13,7 @@
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <stdarg.h>
 
 struct ut_state
 {
@@ -236,6 +237,57 @@ int ut_click(const struct ut_state *state, int *r, int *c)
 #undef P
 }
 
+int info_line; // set this to 21 and reset it on erase TODO
+void ut_info(const char *str, int n)
+{
+	mvaddnstr(info_line, 0, str, n);
+//	info_line++; // depends on str not containing newlines
+	int y, x;
+	getyx(stdscr, y, x);
+	info_line = y + 1;
+}
+
+int readfill(int fd, char *x, size_t l)
+{
+	while(l > 0)
+	{
+		int r = read(fd, x, l);
+		if(r < 0)
+		{
+			if(errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {continue;}
+			else {return 1;}
+		}
+		else if(r == 0) {return 2;}
+		x += r; l -= r;
+	}
+	return 0;
+}
+
+#define MAX_LINE 128
+
+int ut_dprintf(int fd, const char *restrict format, ...)
+{
+	char line[MAX_LINE];
+	va_list ap;
+	va_start(ap, format);
+	int n = vsnprintf(line, MAX_LINE, format, ap);
+	va_end(ap);
+	if(n < 0 || n > MAX_LINE - 1) {return -1;}
+	if(readfill(fd, line, n)) {return -1;}
+	return n;
+}
+int ut_cursprintf(const char *restrict format, ...)
+{
+	char line[MAX_LINE];
+	va_list ap;
+	va_start(ap, format);
+	int n = vsnprintf(line, MAX_LINE, format, ap);
+	va_end(ap);
+	if(n < 0 || n > MAX_LINE - 1) {return -1;}
+	if(ut_info(line)) {return -1;}
+	return n;
+}
+
 void ut_show(const struct ut_state *state, FILE *file, bool as_comment) {
 	#define tiles state->tiles
 	printf("Turn: %c\nPlay board: %d\n", (int)state->player, state->playBoard);
@@ -286,29 +338,6 @@ void ut_show_boards(const struct ut_state *state) {
 	}
 }
 
-int info_line; // set this to 21 and reset it on erase TODO
-void ut_info(const char *str)
-{
-	mvaddstr(info_line, 0, str);
-	info_line++;
-}
-
-int readfill(int fd, char *x, size_t l)
-{
-	while(l > 0)
-	{
-		int r = read(fd, x, l);
-		if(r < 0)
-		{
-			if(errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR) {continue;}
-			else {return 1;}
-		}
-		else if(r == 0) {return 2;}
-		x += r; l -= r;
-	}
-	return 0;
-}
-
 bool getpos(const struct ut_state *state, int *x, int *y) {
 	while (true) {
 		printf("Place token %c at position x,y: ", state->player);