- Fix snprintf() to work with nan and inf properly

main/snprintf.c

@@ -112,7 +112,8 @@ static char *
 	 */
 	if (fi != 0) {
 		p1 = &buf[NDIG];
-		while (fi != 0) {
+//		while (fi != 0) {
+		while (p1 > &buf[0] && fi != 0) {
 			fj = modf(fi / 10, &fi);
 			*--p1 = (int) ((fj + .03) * 10) + '0';
 			r2++;
@@ -743,15 +744,23 @@ static int format_converter(register buffy * odp, const char *fmt,
 				case 'E':
 					fp_num = va_arg(ap, double);
 
-					s = conv_fp(*fmt, fp_num, alternate_form,
-					 (adjust_precision == NO) ? FLOAT_DIGITS : precision,
-								&is_negative, &num_buf[1], &s_len);
-					if (is_negative)
-						prefix_char = '-';
-					else if (print_sign)
-						prefix_char = '+';
-					else if (print_blank)
-						prefix_char = ' ';
+					if (zend_isnan(fp_num)) {
+						s = "nan";
+						s_len = 3;
+					} else if (zend_isinf(fp_num)) {
+						s = "inf";
+						s_len = 3;
+					} else {
+						s = conv_fp(*fmt, fp_num, alternate_form,
+						 (adjust_precision == NO) ? FLOAT_DIGITS : precision,
+									&is_negative, &num_buf[1], &s_len);
+						if (is_negative)
+							prefix_char = '-';
+						else if (print_sign)
+							prefix_char = '+';
+						else if (print_blank)
+							prefix_char = ' ';
+					}
 					break;