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-rw-r--r--compat/pwrite.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/compat/pwrite.c b/compat/pwrite.c
new file mode 100644
index 0000000..82f5f55
--- /dev/null
+++ b/compat/pwrite.c
@@ -0,0 +1,29 @@
+/*
+ * Public domain
+ *
+ * Kinichiro Inoguchi <inoguchi@openbsd.org>
+ */
+
+#ifdef _WIN32
+
+#define NO_REDEF_POSIX_FUNCTIONS
+
+#include <unistd.h>
+
+ssize_t
+pwrite(int d, const void *buf, size_t nbytes, off_t offset)
+{
+	off_t cpos, opos, rpos;
+	ssize_t bytes;
+	if((cpos = lseek(d, 0, SEEK_CUR)) == -1)
+		return -1;
+	if((opos = lseek(d, offset, SEEK_SET)) == -1)
+		return -1;
+	if((bytes = write(d, buf, nbytes)) == -1)
+		return -1;
+	if((rpos = lseek(d, cpos, SEEK_SET)) == -1)
+		return -1;
+	return bytes;
+}
+
+#endif