1 files changed, 138 insertions, 0 deletions
diff --git a/src/gfile/gfile_fs_strings.c b/src/gfile/gfile_fs_strings.c
new file mode 100644
index 00000000..35c1575c
--- /dev/null
+++ b/src/gfile/gfile_fs_strings.c
@@ -0,0 +1,138 @@
+/*
+ * This file is subject to the terms of the GFX License. If a copy of
+ * the license was not distributed with this file, you can obtain one at:
+ *
+ *              http://ugfx.org/license.html
+ */
+
+/********************************************************
+ * The virtual string file
+ ********************************************************/
+
+#include "gfx.h"
+
+#if GFX_USE_GFILE && GFILE_NEED_STRINGS
+
+#include "gfile_fs.h"
+
+#include <string.h>
+
+// Special String VMT
+static int StringRead(GFILE *f, void *buf, int size) {
+	int		res;
+	char	*p;
+
+	p = ((char *)f->obj) + f->pos;
+	for(res = 0; res < size && *p; res++, p++, buf = ((char *)buf)+1)
+		((char *)buf)[0] = *p;
+	return res;
+}
+static int StringWrite(GFILE *f, const void *buf, int size) {
+	if ((f->flags & GFILEFLG_APPEND)) {
+		while(((char *)f->obj)[f->pos])
+			f->pos++;
+	}
+	memcpy(((char *)f->obj)+f->pos, buf, size);
+	((char *)f->obj)[f->pos+size] = 0;
+	return size;
+}
+
+static const GFILEVMT StringVMT = {
+	0,								// flags
+	'_',							// prefix
+	0, 0, 0, 0,
+	0, 0, StringRead, StringWrite,
+	0, 0, 0,
+	0, 0, 0,
+	#if GFILE_NEED_FILELISTS
+		0, 0, 0,
+	#endif
+};
+
+static void gfileOpenStringFromStaticGFILE(GFILE *f, char *str) {
+	if ((f->flags & GFILEFLG_TRUNC))
+		str[0] = 0;
+	f->vmt = &StringVMT;
+	f->obj = str;
+	f->pos = 0;
+	f->flags |= GFILEFLG_OPEN|GFILEFLG_CANSEEK;
+}
+
+GFILE *gfileOpenString(char *str, const char *mode) {
+	GFILE	*f;
+
+	// Get an empty file and set the flags
+	if (!(f = _gfileFindSlot(mode)))
+		return 0;
+
+	// File is open - fill in all the details
+	gfileOpenStringFromStaticGFILE(f, str);
+	return f;
+}
+
+#if GFILE_NEED_PRINTG
+	int snprintg(char *buf, int maxlen, const char *fmt, ...) {
+		int		res;
+		GFILE	f;
+		va_list	ap;
+
+		if (maxlen <= 1) {
+			if (maxlen == 1) {
+				*buf = 0;
+				return 0;
+			}
+			maxlen += 1;
+		}
+
+		f.flags = GFILEFLG_WRITE|GFILEFLG_TRUNC;
+		gfileOpenStringFromStaticGFILE(&f, buf);
+
+		va_start(ap, fmt);
+		res = vfnprintg(&f, maxlen-1, fmt, ap);
+		va_end(ap);
+		return res;
+	}
+	int vsnprintg(char *buf, int maxlen, const char *fmt, va_list arg) {
+		GFILE	f;
+
+		if (maxlen <= 1) {
+			if (maxlen == 1) {
+				*buf = 0;
+				return 0;
+			}
+			maxlen += 1;
+		}
+
+		f.flags = GFILEFLG_WRITE|GFILEFLG_TRUNC;
+		gfileOpenStringFromStaticGFILE(&f, buf);
+
+		return vfnprintg(&f, maxlen-1, fmt, arg);
+	}
+#endif
+
+#if GFILE_NEED_SCANG
+	int sscang(const char *buf, const char *fmt, ...) {
+		int		res;
+		GFILE	f;
+		va_list	ap;
+
+		f.flags = GFILEFLG_READ;
+		gfileOpenStringFromStaticGFILE(&f, (char *)buf);
+
+		va_start(ap, fmt);
+		res = vfscang(&f, fmt, ap);
+		va_end(ap);
+		return res;
+	}
+
+	int vsscang(const char *buf, const char *fmt, va_list arg) {
+		GFILE	f;
+
+		f.flags = GFILEFLG_READ;
+		gfileOpenStringFromStaticGFILE(&f, (char *)buf);
+
+		return vfscang(&f, fmt, arg);
+	}
+#endif
+
+#endif //GFX_USE_GFILE && GFILE_NEED_STRINGS