From befba57fe6a18fba4272ae5832a9cd6f3a5d70aa Mon Sep 17 00:00:00 2001
From: Jeffrey Pfau <jeffrey@endrift.com>
Date: Sat, 6 Apr 2013 04:34:19 -0700
Subject: [PATCH] Simple error checking

---
 src/gba.c | 12 ++++++++++++
 src/gba.h |  8 ++++++++
 2 files changed, 20 insertions(+)

diff --git a/src/gba.c b/src/gba.c
index 6b00bbce6..82eb80a4b 100644
--- a/src/gba.c
+++ b/src/gba.c
@@ -2,8 +2,14 @@
 
 #include <sys/mman.h>
 
+static const char* GBA_CANNOT_MMAP = "Could not map memory";
+
 void GBAInit(struct GBA* gba) {
+	gba->errno = GBA_NO_ERROR;
+	gba->errstr = 0;
+
 	ARMInit(&gba->cpu);
+
 	gba->memory.p = gba;
 	GBAMemoryInit(&gba->memory);
 }
@@ -26,6 +32,12 @@ void GBAMemoryInit(struct GBAMemory* memory) {
 	memory->wram = mmap(0, SIZE_WORKING_RAM, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
 	memory->iwram = mmap(0, SIZE_WORKING_IRAM, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
 	memory->rom = 0;
+
+	if (!memory->wram || !memory->iwram) {
+		GBAMemoryDeinit(memory);
+		memory->p->errno = GBA_OUT_OF_MEMORY;
+		memory->p->errstr = GBA_CANNOT_MMAP;
+	}
 }
 
 void GBAMemoryDeinit(struct GBAMemory* memory) {
diff --git a/src/gba.h b/src/gba.h
index e29cb3787..65c42bd98 100644
--- a/src/gba.h
+++ b/src/gba.h
@@ -3,6 +3,11 @@
 
 #include "arm.h"
 
+enum GBAError {
+	GBA_NO_ERROR = 0,
+	GBA_OUT_OF_MEMORY = -1
+};
+
 enum GBAMemoryRegion {
 	REGION_BIOS = 0x0,
 	REGION_WORKING_RAM = 0x2,
@@ -59,6 +64,9 @@ struct GBA {
 	struct ARMCore cpu;
 	struct GBABoard board;
 	struct GBAMemory memory;
+
+	enum GBAError errno;
+	const char* errstr;
 };
 
 void GBAInit(struct GBA* gba);