runtimes/native: add w4_readf64LE

yamt · Aug 15, 2024 · 5f3f011 · 5f3f011
1 parent 753c4d2
commit 5f3f011
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diff --git a/runtimes/native/src/util.c b/runtimes/native/src/util.c
@@ -21,6 +21,7 @@ void* xrealloc(void* ptr, size_t size) {
         fputs("Allocation failed.\n", stderr);
         abort();
     }
+    return ptr;
 }
 
 uint16_t bswap16(uint16_t x) {
@@ -50,6 +51,19 @@ uint32_t w4_read32LE (const uint32_t* ptr) {
 #endif
 }
 
+double w4_readf64LE (const uint64_t* ptr) {
+    union {
+        uint64_t u;
+        double d;
+    } u;
+#ifdef W4_BIG_ENDIAN
+    u.u = bswap32(*ptr);
+#else
+    u.u = *ptr;
+#endif
+    return u.d;
+}
+
 void w4_write16LE (uint16_t* ptr, uint16_t value) {
 #ifdef W4_BIG_ENDIAN
     *ptr = bswap16(value);

diff --git a/runtimes/native/src/util.h b/runtimes/native/src/util.h
@@ -9,6 +9,7 @@ void* xrealloc(void* ptr, size_t size);
 
 uint16_t w4_read16LE (const uint16_t* ptr);
 uint32_t w4_read32LE (const uint32_t* ptr);
+double w4_readf64LE (const uint64_t* ptr);
 
 void w4_write16LE (uint16_t* ptr, uint16_t value);
 void w4_write32LE (uint32_t* ptr, uint32_t value);