From 632fb9730649c97b087602ced96f44af67b3687d Mon Sep 17 00:00:00 2001
From: Kevin Day <thekevinday@gmail.com>
Date: Thu, 20 Aug 2020 21:53:30 -0500
Subject: [PATCH] Update: don't tread buffer.used = 0 as error for print
 functions.

Instead, return F_data_not without error bit to default as not an error while still allowing the caller to consider the situation.
---
 level_0/f_print/c/print.c | 10 +++++-----
 level_0/f_print/c/print.h |  3 +++
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/level_0/f_print/c/print.c b/level_0/f_print/c/print.c
index 3499922..2cf4529 100644
--- a/level_0/f_print/c/print.c
+++ b/level_0/f_print/c/print.c
@@ -8,9 +8,10 @@ extern "C" {
   f_return_status f_print_string(FILE *output, const f_string string, const f_string_length length) {
     #ifndef _di_level_0_parameter_checking_
       if (string == 0) return F_status_set_error(F_parameter);
-      if (length < 1) return F_status_set_error(F_parameter);
     #endif // _di_level_0_parameter_checking_
 
+    if (length == 0) return F_data_not;
+
     register f_string_length i = 0;
 
     for (; i < length; i++) {
@@ -27,9 +28,7 @@ extern "C" {
 
 #ifndef _di_f_print_string_dynamic_
   f_return_status f_print_string_dynamic(FILE *output, const f_string_static buffer) {
-    #ifndef _di_level_0_parameter_checking_
-      if (buffer.used == 0) return F_status_set_error(F_parameter);
-    #endif // _di_level_0_parameter_checking_
+    if (buffer.used == 0) return F_data_not;
 
     register f_string_length i = 0;
 
@@ -50,11 +49,12 @@ extern "C" {
     #ifndef _di_level_0_parameter_checking_
       if (range.start < 0) return F_status_set_error(F_parameter);
       if (range.start > range.stop) return F_status_set_error(F_parameter);
-      if (buffer.used == 0) return F_status_set_error(F_parameter);
       if (range.start >= buffer.used) return F_status_set_error(F_parameter);
       if (range.stop >= buffer.used) return F_status_set_error(F_parameter);
     #endif // _di_level_0_parameter_checking_
 
+    if (buffer.used == 0) return F_data_not;
+
     register f_string_length i = range.start;
 
     for (; i <= range.stop; i++) {
diff --git a/level_0/f_print/c/print.h b/level_0/f_print/c/print.h
index 47da122..167bbae 100644
--- a/level_0/f_print/c/print.h
+++ b/level_0/f_print/c/print.h
@@ -45,6 +45,7 @@ extern "C" {
  *
  * @return
  *   F_none on success.
+ *   F_data_not if length is 0.
  *   F_output (with error bit) on failure.
  *   F_parameter (with error bit) if a parameter is invalid.
  */
@@ -68,6 +69,7 @@ extern "C" {
  *
  * @return
  *   F_none on success.
+ *   F_data_not if buffer.used is 0.
  *   F_output (with error bit) on failure.
  *   F_parameter (with error bit) if a parameter is invalid.
  */
@@ -93,6 +95,7 @@ extern "C" {
  *
  * @return
  *   F_none on success.
+ *   F_data_not if buffer.used is 0.
  *   F_output (with error bit) on failure.
  *   F_parameter (with error bit) if a parameter is invalid.
  */
-- 
1.8.3.1