From e7cd6e1598c8fa0b11b4ddc23b9037be7749e920 Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Mon, 16 May 2022 19:01:52 +0200
Subject: Update file device to support multiple file devs

---
 src/file.c | 69 ++++++++++++++++++++++++++++++++------------------------------
 src/main.c | 10 +++++----
 2 files changed, 42 insertions(+), 37 deletions(-)

diff --git a/src/file.c b/src/file.c
index a45d59f..6dba2f9 100644
--- a/src/file.c
+++ b/src/file.c
@@ -13,65 +13,68 @@ WITH REGARD TO THIS SOFTWARE.
 
 #include "posprintf.h"
 
-static File f = {0};
-static char *current_filename = "";
+typedef struct {
+    File f;
+    char *filename;
+    enum {
+        IDLE,
+        FILE_READ,
+        FILE_WRITE,
+    } state;
+} UxnFile;
 
-static enum {
-    IDLE,
-    FILE_READ,
-    FILE_WRITE,
-} file_state;
+static UxnFile uxn_file[2];
 
 void
-file_reset(void) {
-    f = (File){0};
-    file_state = IDLE;
+file_reset(UxnFile *f) {
+    f->f = (File){0};
+    f->state = IDLE;
 }
 
 u16
-file_init(void *filename) {
-    file_reset();
-    current_filename = filename;
+file_init(UxnFile *f, void *filename) {
+    file_reset(f);
+    f->filename = filename;
     return 0;
 }
 
 u16
-file_read(void *dest, u16 len) {
-    if(file_state != FILE_READ) {
-        file_reset();
-        f = fs_open_file(current_filename, FS_OPEN_READ);
-        file_state = FILE_READ;
+file_read(UxnFile *f, void *dest, u16 len) {
+    if(f->state != FILE_READ) {
+        file_reset(f);
+        f->f = fs_open_file(f->filename, FS_OPEN_READ);
+        f->state = FILE_READ;
     }
-    if (f.index == FS_NULL) {
+    if (f->f.index == FS_NULL) {
         return 0;
     }
-    return fs_read(dest, len, &f);
+    return fs_read(dest, len, &f->f);
 }
 
 u16
-file_write(void *src, u16 len, u8 flags) {
-    if(file_state != FILE_WRITE) {
-        file_reset();
+file_write(UxnFile *f, void *src, u16 len, u8 flags) {
+    if(f->state != FILE_WRITE) {
+        file_reset(f);
         OpenMode mode = (flags & 0x01) ? FS_OPEN_APPEND : FS_OPEN_WRITE;
-        f = fs_open_file(current_filename, mode);
-        file_state = FILE_WRITE;
+        f->f = fs_open_file(f->filename, mode);
+        f->state = FILE_WRITE;
     }
-    if (f.index == FS_NULL) {
+    if (f->f.index == FS_NULL) {
         return 0;
     }
-    return fs_write(src, len, &f);
+    return fs_write(src, len, &f->f);
 }
 
 u16
-file_stat(void *dest, u16 len) {
-    if(len < strlen(current_filename) + 7) {
+file_stat(UxnFile *f, void *dest, u16 len) {
+    if(len < strlen(f->filename) + 7) {
         return 0;
     }
-    if (f.index == FS_NULL) {
-        posprintf(dest, "!!!! %s\n", current_filename);
+    if (f->f.index == FS_NULL) {
+        posprintf(dest, "!!!! %s\n", f->filename);
     } else {
-        u16 file_size = fs_file_size(&f);
-        posprintf(dest, "%04x %s\n", (unsigned int)file_size, current_filename);
+        u16 file_size = fs_file_size(&f->f);
+        posprintf(dest, "%04x %s\n", (unsigned int)file_size, f->filename);
     }
     return 0;
 }
diff --git a/src/main.c b/src/main.c
index 1acae1b..21bc2a7 100644
--- a/src/main.c
+++ b/src/main.c
@@ -223,6 +223,7 @@ void
 file_talk(Device *d, u8 b0, u8 w) {
     if (w) {
         u16 a, b, res;
+        UxnFile *f = &uxn_file[d - &d->u->dev[0xa]];
         switch(b0) {
             case 0x5: {
                 DEVPEEK16(a, 0x4);
@@ -230,16 +231,17 @@ file_talk(Device *d, u8 b0, u8 w) {
                 if(b > 0x10000 - a) {
                     b = 0x10000 - a;
                 }
-                res = file_stat(&d->mem[a], b);
+                res = file_stat(f, &d->mem[a], b);
                 DEVPOKE16(0x2, res);
             } break;
             case 0x6: {
+                // TODO: no file deletion for now
                 // res = file_delete();
                 // DEVPOKE16(0x2, res);
             } break;
             case 0x9: {
                 DEVPEEK16(a, 0x8);
-                res = file_init(&d->mem[a]);
+                res = file_init(f, &d->mem[a]);
                 DEVPOKE16(0x2, res);
             } break;
             case 0xd: {
@@ -248,7 +250,7 @@ file_talk(Device *d, u8 b0, u8 w) {
                 if(b > 0x10000 - a) {
                     b = 0x10000 - a;
                 }
-                res = file_read(&d->mem[a], b);
+                res = file_read(f, &d->mem[a], b);
                 DEVPOKE16(0x2, res);
             } break;
             case 0xf: {
@@ -257,7 +259,7 @@ file_talk(Device *d, u8 b0, u8 w) {
                 if(b > 0x10000 - a) {
                     b = 0x10000 - a;
                 }
-                res = file_write(&d->mem[a], b, d->dat[0x7]);
+                res = file_write(f, &d->mem[a], b, d->dat[0x7]);
                 DEVPOKE16(0x2, res);
             } break;
         }
-- 
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