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Fix undefined behavior of signed integer overflow
Testing for overflow by adding a value to a variable to see if it "wraps around" works only for unsigned integer values. Signed integer overflow is undefined behavior in C and C++.
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@ -36,6 +36,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#include <limits.h>
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#include "linmath.h"
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@ -103,7 +104,7 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
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{
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case GLFW_KEY_UP:
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{
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if (swap_interval + 1 > swap_interval)
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if (swap_interval <= INT_MAX - 1)
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set_swap_interval(window, swap_interval + 1);
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break;
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}
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@ -112,12 +113,12 @@ static void key_callback(GLFWwindow* window, int key, int scancode, int action,
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{
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if (swap_tear)
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{
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if (swap_interval - 1 < swap_interval)
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if (swap_interval >= INT_MIN + 1)
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set_swap_interval(window, swap_interval - 1);
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}
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else
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{
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if (swap_interval - 1 >= 0)
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if (swap_interval >= 1)
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set_swap_interval(window, swap_interval - 1);
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}
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break;
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