patch 8.1.2094: the fileio.c file is too big
Problem: The fileio.c file is too big.
Solution: Move buf_write() to bufwrite.c. (Yegappan Lakshmanan,
closes #4990)
diff --git a/src/structs.h b/src/structs.h
index 9d2ec16..adbb820 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -3882,3 +3882,32 @@
int no_scs; // no smartcase for this pattern
soffset_T off;
} spat_T;
+
+#define WRITEBUFSIZE 8192 // size of normal write buffer
+
+#define FIO_LATIN1 0x01 // convert Latin1
+#define FIO_UTF8 0x02 // convert UTF-8
+#define FIO_UCS2 0x04 // convert UCS-2
+#define FIO_UCS4 0x08 // convert UCS-4
+#define FIO_UTF16 0x10 // convert UTF-16
+#ifdef MSWIN
+# define FIO_CODEPAGE 0x20 // convert MS-Windows codepage
+# define FIO_PUT_CP(x) (((x) & 0xffff) << 16) // put codepage in top word
+# define FIO_GET_CP(x) (((x)>>16) & 0xffff) // get codepage from top word
+#endif
+#ifdef MACOS_CONVERT
+# define FIO_MACROMAN 0x20 // convert MacRoman
+#endif
+#define FIO_ENDIAN_L 0x80 // little endian
+#define FIO_ENCRYPTED 0x1000 // encrypt written bytes
+#define FIO_NOCONVERT 0x2000 // skip encoding conversion
+#define FIO_UCSBOM 0x4000 // check for BOM at start of file
+#define FIO_ALL -1 // allow all formats
+
+// When converting, a read() or write() may leave some bytes to be converted
+// for the next call. The value is guessed...
+#define CONV_RESTLEN 30
+
+// We have to guess how much a sequence of bytes may expand when converting
+// with iconv() to be able to allocate a buffer.
+#define ICONV_MULT 8