From 502d597aebc3e122bc9b6065d2eccd6f2c27c664 Mon Sep 17 00:00:00 2001
From: Misa <infoteddyatgitgud@cock.li>
Date: Thu, 6 Aug 2020 21:22:10 -0700
Subject: [PATCH] Add is_number()

This will be used to check if a string is a valid integer. So negative
numbers are accepted, unlike is_positive_num().
---
 desktop_version/src/UtilityClass.cpp | 12 ++++++++++++
 desktop_version/src/UtilityClass.h   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/desktop_version/src/UtilityClass.cpp b/desktop_version/src/UtilityClass.cpp
index 9ff685f6..8d27de2a 100644
--- a/desktop_version/src/UtilityClass.cpp
+++ b/desktop_version/src/UtilityClass.cpp
@@ -205,6 +205,18 @@ void UtilityClass::updateglow()
 	}
 }
 
+bool is_number(const char* str)
+{
+	for (int i = 0; str[i] != '\0'; i++)
+	{
+		if (!SDL_isdigit(static_cast<unsigned char>(str[i])) && (i != 0 || str[0] != '-'))
+		{
+			return false;
+		}
+	}
+	return true;
+}
+
 bool is_positive_num(const std::string& str, bool hex)
 {
 	for (size_t i = 0; i < str.length(); i++)
diff --git a/desktop_version/src/UtilityClass.h b/desktop_version/src/UtilityClass.h
index 42558fe1..923f8d64 100644
--- a/desktop_version/src/UtilityClass.h
+++ b/desktop_version/src/UtilityClass.h
@@ -11,6 +11,8 @@ std::vector<std::string> split(const std::string &s, char delim, std::vector<std
 
 std::vector<std::string> split(const std::string &s, char delim);
 
+bool is_number(const char* str);
+
 bool is_positive_num(const std::string& str, bool hex);
 
 bool endsWith(const std::string& str, const std::string& suffix);