diff --git a/src/common/io.h b/src/common/io.h
index b4640bedb..35a70675f 100644
--- a/src/common/io.h
+++ b/src/common/io.h
@@ -19,6 +19,6 @@ bool ffFileExists(const char* fileName, mode_t mode);
 // Not thread safe!
 void ffSuppressIO(bool suppress);
 
-void ffGetTerminalResponse(const char* request, const char* format, ...);
+FF_C_SCANF(2, 3) void ffGetTerminalResponse(const char* request, const char* format, ...);
 
 #endif
diff --git a/src/common/printing.h b/src/common/printing.h
index 7eb6ffae6..9a734634b 100644
--- a/src/common/printing.h
+++ b/src/common/printing.h
@@ -9,8 +9,8 @@
 void ffPrintLogoAndKey(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFstrbuf* customKeyFormat);
 void ffPrintFormatString(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFstrbuf* customKeyFormat, const FFstrbuf* format, uint32_t numArgs, const FFformatarg* arguments);
 void ffPrintFormat(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFModuleArgs* moduleArgs, uint32_t numArgs, const FFformatarg* arguments);
-void ffPrintErrorString(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFstrbuf* customKeyFormat, const FFstrbuf* customErrorFormat, const char* message, ...);
-void ffPrintError(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFModuleArgs* moduleArgs, const char* message, ...);
+FF_C_PRINTF(6, 7) void ffPrintErrorString(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFstrbuf* customKeyFormat, const FFstrbuf* customErrorFormat, const char* message, ...);
+FF_C_PRINTF(5, 6) void ffPrintError(FFinstance* instance, const char* moduleName, uint8_t moduleIndex, const FFModuleArgs* moduleArgs, const char* message, ...);
 void ffPrintColor(const FFstrbuf* colorValue);
 void ffPrintCharTimes(char c, uint32_t times);
 void ffPrintUserString(const char* str);
diff --git a/src/modules/opencl.c b/src/modules/opencl.c
index 49e8bbf1e..6b9c0a643 100644
--- a/src/modules/opencl.c
+++ b/src/modules/opencl.c
@@ -118,5 +118,5 @@ void ffPrintOpenCL(FFinstance* instance)
     #endif
 
     if(error != NULL)
-        ffPrintError(instance, FF_OPENCL_MODULE_NAME, 0, &instance->config.openCL, error);
+        ffPrintError(instance, FF_OPENCL_MODULE_NAME, 0, &instance->config.openCL, "%s", error);
 }
diff --git a/src/modules/opengl.c b/src/modules/opengl.c
index fdab25a2a..9e263779e 100644
--- a/src/modules/opengl.c
+++ b/src/modules/opengl.c
@@ -453,5 +453,5 @@ void ffPrintOpenGL(FFinstance* instance)
     #endif
 
     if(error != NULL)
-        ffPrintError(instance, FF_OPENGL_MODULE_NAME, 0, &instance->config.openGL, error);
+        ffPrintError(instance, FF_OPENGL_MODULE_NAME, 0, &instance->config.openGL, "%s", error);
 }
diff --git a/src/modules/terminalfont.c b/src/modules/terminalfont.c
index 561d1163c..b2e8dc178 100644
--- a/src/modules/terminalfont.c
+++ b/src/modules/terminalfont.c
@@ -123,7 +123,7 @@ static void printKonsole(FFinstance* instance)
 
     if(profile.length == 0)
     {
-        ffPrintError(instance, FF_TERMFONT_MODULE_NAME, 0, &instance->config.terminalFont, "Couldn't find \"DefaultProfile=%[^\\n]\" in \".config/konsolerc\"");
+        ffPrintError(instance, FF_TERMFONT_MODULE_NAME, 0, &instance->config.terminalFont, "%s", "Couldn't find \"DefaultProfile=%[^\\n]\" in \".config/konsolerc\"");
         ffStrbufDestroy(&profile);
         return;
     }
diff --git a/src/modules/vulkan.c b/src/modules/vulkan.c
index 53285d1c7..4b3d19fea 100644
--- a/src/modules/vulkan.c
+++ b/src/modules/vulkan.c
@@ -11,7 +11,7 @@ void ffPrintVulkan(FFinstance* instance)
 
     if(vulkan->error)
     {
-        ffPrintError(instance, FF_VULKAN_MODULE_NAME, 0, &instance->config.vulkan, vulkan->error);
+        ffPrintError(instance, FF_VULKAN_MODULE_NAME, 0, &instance->config.vulkan, "%s", vulkan->error);
         return;
     }
 
diff --git a/src/util/FFcheckmacros.h b/src/util/FFcheckmacros.h
new file mode 100644
index 000000000..1ed61cf82
--- /dev/null
+++ b/src/util/FFcheckmacros.h
@@ -0,0 +1,24 @@
+#pragma once
+
+#ifndef FASTFETCH_INCLUDED_FFCHECKMACROS
+#define FASTFETCH_INCLUDED_FFCHECKMACROS
+
+#if defined(__GNUC__) || defined(__clang__)
+    #define FF_C_NODISCARD __attribute__((warn_unused_result))
+#else
+    #define FF_C_NODISCARD
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+    #define FF_C_PRINTF(formatStrIndex, argsStartIndex) __attribute__((__format__ (printf, formatStrIndex, argsStartIndex)))
+#else
+    #define FF_C_PRINTF(formatStrIndex, argsStartIndex)
+#endif
+
+#if defined(__GNUC__) || defined(__clang__)
+    #define FF_C_SCANF(formatStrIndex, argsStartIndex) __attribute__((__format__ (scanf, formatStrIndex, argsStartIndex)))
+#else
+    #define FF_C_SCANF(formatStrIndex, argsStartIndex)
+#endif
+
+#endif
diff --git a/src/util/FFlist.h b/src/util/FFlist.h
index 30cef1b7a..8f477dd54 100644
--- a/src/util/FFlist.h
+++ b/src/util/FFlist.h
@@ -3,6 +3,8 @@
 #ifndef FF_INCLUDED_FFLIST
 #define FF_INCLUDED_FFLIST
 
+#include "FFcheckmacros.h"
+
 #include <stdbool.h>
 #include <stdint.h>
 
@@ -19,11 +21,11 @@ typedef struct FFlist
 void ffListInit(FFlist* list, uint32_t elementSize);
 void ffListInitA(FFlist* list, uint32_t elementSize, uint32_t capacity);
 
-void* ffListGet(const FFlist* list, uint32_t index);
+FF_C_NODISCARD void* ffListGet(const FFlist* list, uint32_t index);
 
 void* ffListAdd(FFlist* list);
 
-uint32_t ffListFirstIndexComp(const FFlist* list, void* compElement, bool(*compFunc)(const void*, const void*));
+FF_C_NODISCARD uint32_t ffListFirstIndexComp(const FFlist* list, void* compElement, bool(*compFunc)(const void*, const void*));
 
 void ffListDestroy(FFlist* list);
 
diff --git a/src/util/FFstrbuf.h b/src/util/FFstrbuf.h
index 0dec7cd40..0c0b9020b 100644
--- a/src/util/FFstrbuf.h
+++ b/src/util/FFstrbuf.h
@@ -3,6 +3,8 @@
 #ifndef FASTFETCH_INCLUDED_FFSTRBUF
 #define FASTFETCH_INCLUDED_FFSTRBUF
 
+#include "FFcheckmacros.h"
+
 #include <stdint.h>
 #include <stdarg.h>
 #include <stdbool.h>
@@ -25,7 +27,7 @@ void ffStrbufInitCopy(FFstrbuf* strbuf, const FFstrbuf* src);
 
 void ffStrbufEnsureFree(FFstrbuf* strbuf, uint32_t free);
 
-uint32_t ffStrbufGetFree(const FFstrbuf* strbuf);
+FF_C_NODISCARD uint32_t ffStrbufGetFree(const FFstrbuf* strbuf);
 
 void ffStrbufClear(FFstrbuf* strbuf);
 
@@ -37,7 +39,7 @@ void ffStrbufAppendS(FFstrbuf* strbuf, const char* value);
 void ffStrbufAppendNS(FFstrbuf* strbuf, uint32_t length, const char* value);
 void ffStrbufAppendNSExludingC(FFstrbuf* strbuf, uint32_t length, const char* value, char exclude);
 void ffStrbufAppendTransformS(FFstrbuf* strbuf, const char* value, int(*transformFunc)(int));
-void ffStrbufAppendF(FFstrbuf* strbuf, const char* format, ...);
+FF_C_PRINTF(2, 3) void ffStrbufAppendF(FFstrbuf* strbuf, const char* format, ...);
 void ffStrbufAppendVF(FFstrbuf* strbuf, const char* format, va_list arguments);
 
 void ffStrbufPrependS(FFstrbuf* strbuf, const char* value);
@@ -46,11 +48,11 @@ void ffStrbufPrependNS(FFstrbuf* strbuf, uint32_t length, const char* value);
 void ffStrbufSet(FFstrbuf* strbuf, const FFstrbuf* value);
 void ffStrbufSetS(FFstrbuf* strbuf, const char* value);
 
-int ffStrbufComp(const FFstrbuf* strbuf, const FFstrbuf* comp);
-int ffStrbufCompS(const FFstrbuf* strbuf, const char* comp);
+FF_C_NODISCARD int ffStrbufComp(const FFstrbuf* strbuf, const FFstrbuf* comp);
+FF_C_NODISCARD int ffStrbufCompS(const FFstrbuf* strbuf, const char* comp);
 
-int ffStrbufIgnCaseComp(const FFstrbuf* strbuf, const FFstrbuf* comp);
-int ffStrbufIgnCaseCompS(const FFstrbuf* strbuf, const char* comp);
+FF_C_NODISCARD int ffStrbufIgnCaseComp(const FFstrbuf* strbuf, const FFstrbuf* comp);
+FF_C_NODISCARD int ffStrbufIgnCaseCompS(const FFstrbuf* strbuf, const char* comp);
 
 void ffStrbufTrimLeft(FFstrbuf* strbuf, char c);
 void ffStrbufTrimRight(FFstrbuf* strbuf, char c);
@@ -62,16 +64,16 @@ void ffStrbufRemoveStringsA(FFstrbuf* strbuf, uint32_t numStrings, const char* s
 void ffStrbufRemoveStringsV(FFstrbuf* strbuf, uint32_t numStrings, va_list arguments);
 void ffStrbufRemoveStrings(FFstrbuf* strbuf, uint32_t numStrings, ...);
 
-uint32_t ffStrbufNextIndexC(const FFstrbuf* strbuf, uint32_t start, char c);
-uint32_t ffStrbufNextIndexS(const FFstrbuf* strbuf, uint32_t start, const char* str);
+FF_C_NODISCARD uint32_t ffStrbufNextIndexC(const FFstrbuf* strbuf, uint32_t start, char c);
+FF_C_NODISCARD uint32_t ffStrbufNextIndexS(const FFstrbuf* strbuf, uint32_t start, const char* str);
 
-uint32_t ffStrbufFirstIndexC(const FFstrbuf* strbuf, char c);
-uint32_t ffStrbufFirstIndex(const FFstrbuf* strbuf, const FFstrbuf* searched);
-uint32_t ffStrbufFirstIndexS(const FFstrbuf* strbuf, const char* str);
+FF_C_NODISCARD uint32_t ffStrbufFirstIndexC(const FFstrbuf* strbuf, char c);
+FF_C_NODISCARD uint32_t ffStrbufFirstIndex(const FFstrbuf* strbuf, const FFstrbuf* searched);
+FF_C_NODISCARD uint32_t ffStrbufFirstIndexS(const FFstrbuf* strbuf, const char* str);
 
-uint32_t ffStrbufPreviousIndexC(const FFstrbuf* strbuf, uint32_t start, char c);
+FF_C_NODISCARD uint32_t ffStrbufPreviousIndexC(const FFstrbuf* strbuf, uint32_t start, char c);
 
-uint32_t ffStrbufLastIndexC(const FFstrbuf* strbuf, char c);
+FF_C_NODISCARD uint32_t ffStrbufLastIndexC(const FFstrbuf* strbuf, char c);
 
 void ffStrbufSubstrBefore(FFstrbuf* strbuf, uint32_t index);
 void ffStrbufSubstrBeforeFirstC(FFstrbuf* strbuf, char c);
@@ -89,7 +91,7 @@ bool ffStrbufStartsWithIgnCaseS(const FFstrbuf* strbuf, const char* start);
 bool ffStrbufEndsWithC(const FFstrbuf* strbuf, char c);
 bool ffStrbufEndsWithS(const FFstrbuf* strbuf, const char* end);
 
-uint32_t ffStrbufCountC(const FFstrbuf* strbuf, char c);
+FF_C_NODISCARD uint32_t ffStrbufCountC(const FFstrbuf* strbuf, char c);
 
 bool ffStrbufRemoveIgnCaseEndS(FFstrbuf* strbuf, const char* end);
 
@@ -98,8 +100,8 @@ void ffStrbufEnsureEndsWithC(FFstrbuf* strbuf, char c);
 void ffStrbufWriteTo(const FFstrbuf* strbuf, FILE* file);
 void ffStrbufPutTo(const FFstrbuf* strbuf, FILE* file);
 
-double ffStrbufToDouble(const FFstrbuf* strbuf);
-uint16_t ffStrbufToUInt16(const FFstrbuf* strbuf, uint16_t defaultValue);
+FF_C_NODISCARD double ffStrbufToDouble(const FFstrbuf* strbuf);
+FF_C_NODISCARD uint16_t ffStrbufToUInt16(const FFstrbuf* strbuf, uint16_t defaultValue);
 
 void ffStrbufDestroy(FFstrbuf* strbuf);
 
diff --git a/src/util/FFvaluestore.h b/src/util/FFvaluestore.h
index 58f0b714b..c59b584a6 100644
--- a/src/util/FFvaluestore.h
+++ b/src/util/FFvaluestore.h
@@ -3,12 +3,13 @@
 #ifndef FASTFETCH_INCLUDED_FFVALUESTORE
 #define FASTFETCH_INCLUDED_FFVALUESTORE
 
-#include "util/FFlist.h"
+#include "FFlist.h"
+#include "FFcheckmacros.h"
 
 typedef FFlist FFvaluestore;
 
 void ffValuestoreInit(FFvaluestore* vs, uint32_t valueSize);
-void* ffValuestoreGet(FFvaluestore* vs, const char* key);
+FF_C_NODISCARD void* ffValuestoreGet(FFvaluestore* vs, const char* key);
 void* ffValuestoreSet(FFvaluestore* vs, const char* key, bool* created); //created may be NULL
 void ffValuestoreDestroy(FFvaluestore* vs);