diff --git a/include/stdarg.h b/include/stdarg.h
new file mode 100644
index 00000000..aa7e3393
--- /dev/null
+++ b/include/stdarg.h
@@ -0,0 +1,42 @@
+#ifndef STDARG_H
+#define STDARG_H
+
+// When not building with IDO, use the builtin vaarg macros for portability.
+#ifndef __sgi
+#define va_list __builtin_va_list
+#define va_start __builtin_va_start
+#define va_arg __builtin_va_arg
+#define va_end __builtin_va_end
+#else
+
+typedef char *va_list;
+#define _FP 1
+#define _INT 0
+#define _STRUCT 2
+
+#define _VA_FP_SAVE_AREA 0x10
+#define _VA_ALIGN(p, a) (((unsigned int)(((char *)p) + ((a) > 4 ? (a) : 4) - 1)) & -((a) > 4 ? (a) : 4))
+#define va_start(vp, parmN) (vp = ((va_list)&parmN + sizeof(parmN)))
+
+#define __va_stack_arg(list, mode)                          \
+    (                                                       \
+        ((list) = (char *)_VA_ALIGN(list, __builtin_alignof(mode)) + \
+                  _VA_ALIGN(sizeof(mode), 4)),              \
+        (((char *)list) - (_VA_ALIGN(sizeof(mode), 4) - sizeof(mode))))
+
+#define __va_double_arg(list, mode)                                                                    \
+    (                                                                                                  \
+        (((long)list & 0x1) /* 1 byte aligned? */                                                      \
+             ? (list = (char *)((long)list + 7), (char *)((long)list - 6 - _VA_FP_SAVE_AREA))          \
+             : (((long)list & 0x2) /* 2 byte aligned? */                                               \
+                    ? (list = (char *)((long)list + 10), (char *)((long)list - 24 - _VA_FP_SAVE_AREA)) \
+                    : __va_stack_arg(list, mode))))
+
+#define va_arg(list, mode) ((mode *)(((__builtin_classof(mode) == _FP &&          \
+                                       __builtin_alignof(mode) == sizeof(double)) \
+                                          ? __va_double_arg(list, mode)           \
+                                          : __va_stack_arg(list, mode))))[-1]
+#define va_end(__list)
+
+#endif
+#endif
diff --git a/lib/asm/non_matchings/unknown_0CA940/func_800C9D40.s b/lib/asm/non_matchings/unknown_0CA940/func_800C9D40.s
deleted file mode 100644
index 348ec106..00000000
--- a/lib/asm/non_matchings/unknown_0CA940/func_800C9D40.s
+++ /dev/null
@@ -1,7 +0,0 @@
-glabel func_800C9D40
-/* 0CA940 800C9D40 AFA40000 */  sw    $a0, ($sp)
-/* 0CA944 800C9D44 AFA50004 */  sw    $a1, 4($sp)
-/* 0CA948 800C9D48 AFA60008 */  sw    $a2, 8($sp)
-/* 0CA94C 800C9D4C 03E00008 */  jr    $ra
-/* 0CA950 800C9D50 24020001 */   li    $v0, 1
-
diff --git a/lib/asm/non_matchings/unknown_0CA940/func_800C9D54.s b/lib/asm/non_matchings/unknown_0CA940/func_800C9D54.s
deleted file mode 100644
index b513d761..00000000
--- a/lib/asm/non_matchings/unknown_0CA940/func_800C9D54.s
+++ /dev/null
@@ -1,22 +0,0 @@
-glabel func_800C9D54
-/* 0CA954 800C9D54 27BDFFE0 */  addiu $sp, $sp, -0x20
-/* 0CA958 800C9D58 AFA40020 */  sw    $a0, 0x20($sp)
-/* 0CA95C 800C9D5C AFBF0014 */  sw    $ra, 0x14($sp)
-/* 0CA960 800C9D60 AFA50024 */  sw    $a1, 0x24($sp)
-/* 0CA964 800C9D64 AFA60028 */  sw    $a2, 0x28($sp)
-/* 0CA968 800C9D68 AFA7002C */  sw    $a3, 0x2c($sp)
-/* 0CA96C 800C9D6C 3C04800D */  lui   $a0, %hi(func_800C9D40) # $a0, 0x800d
-/* 0CA970 800C9D70 24849D40 */  addiu $a0, %lo(func_800C9D40) # addiu $a0, $a0, -0x62c0
-/* 0CA974 800C9D74 27A70024 */  addiu $a3, $sp, 0x24
-/* 0CA978 800C9D78 8FA60020 */  lw    $a2, 0x20($sp)
-/* 0CA97C 800C9D7C 0C034FC4 */  jal   _Printf
-/* 0CA980 800C9D80 00002825 */   move  $a1, $zero
-/* 0CA984 800C9D84 8FBF0014 */  lw    $ra, 0x14($sp)
-/* 0CA988 800C9D88 27BD0020 */  addiu $sp, $sp, 0x20
-/* 0CA98C 800C9D8C 03E00008 */  jr    $ra
-/* 0CA990 800C9D90 00000000 */   nop   
-
-/* 0CA994 800C9D94 00000000 */  nop   
-/* 0CA998 800C9D98 00000000 */  nop   
-/* 0CA99C 800C9D9C 00000000 */  nop   
-
diff --git a/lib/src/unknown_0CA940.c b/lib/src/unknown_0CA940.c
index 3467b96d..c0429a30 100644
--- a/lib/src/unknown_0CA940.c
+++ b/lib/src/unknown_0CA940.c
@@ -3,6 +3,14 @@
 
 #include "types.h"
 #include "macros.h"
+#include "stdarg.h"
 
-GLOBAL_ASM("lib/asm/non_matchings/unknown_0CA940/func_800C9D40.s")
-GLOBAL_ASM("lib/asm/non_matchings/unknown_0CA940/func_800C9D54.s")
+s32 get_true(s32 arg0, s32 arg1, s32 arg2) {
+    return TRUE;
+}
+
+void func_800C9D54(const char *format, ...) {
+    va_list args;
+    va_start(args, format);
+    _Printf(get_true, 0, format, args);
+}