Make GNU/Linux emulation work again, with initialization support.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

ChangeLog

@@ -1,3 +1,14 @@
+2021-02-18  NIIBE Yutaka  <gniibe@fsij.org>
+
+	* src/configure [GNU_LINUX_EMULATION] (def_mhz): Define.
+	(output_vendor_product_serial_strings): Output ARCH.
+
+	* GNUK_USB_DEVICE_ID: Use "Gnuk Token" for emulation, too.
+
+	* src/main.c [GNU_LINUX_EMULATION] (main): Add initialization of
+	the .gnuk-flash-image file.
+	(gnuk_sbrk): Rename from sbrk.
+
 2020-09-10  NIIBE Yutaka  <gniibe@fsij.org>
 
 	* VERSION: 1.2.16.

GNUK_USB_DEVICE_ID

@@ -1,5 +1,5 @@
 # VID:PID	bcdDev	Product_STRING	Vendor_STRING
-0000:0000	0200	Gnuk Emulation	Free Software Initiative of Japan
+0000:0000	0200	Gnuk Token	Free Software Initiative of Japan
 234b:0000	0200	Gnuk Token	Free Software Initiative of Japan
 20a0:4211	0200	Nitrokey Start	Nitrokey
 1209:2440	0200	Gnuk Token	GnuPG e.V.

src/configure

@@ -6,7 +6,7 @@ nl=$'\n'
 #
 # This file is *NOT* generated by GNU Autoconf, but written by NIIBE Yutaka
 #
-# Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
+# Copyright (C) 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2021
 #               Free Software Initiative of Japan
 #
 # This file is a part of Gnuk, a GnuPG USB Token implementation.
@@ -210,26 +210,27 @@ FST_01SZ)
   ;;
 esac
 
+def_mhz="-DMHZ=$MHZ"
 if test "$target" = "GNU_LINUX"; then
   ldscript=""
   chip="gnu-linux"
+  arch="gnu-linux"
   emulation="yes"
   cross=""
   mcu="none"
   def_emulation="-DGNU_LINUX_EMULATION"
   def_memory_size="-DMEMORY_SIZE=1024"
-  def_mhz=""
   enable_hexoutput=""
   libs="-lpthread"
 else
   ldscript="gnuk.ld"
   chip="stm32f103"
+  arch="cortex-m"
   emulation=""
   cross="arm-none-eabi-"
   mcu="cortex-m3"
   def_emulation=""
   def_memory_size="-DMEMORY_SIZE=$MEMORY_SIZE"
-  def_mhz="-DMHZ=$MHZ"
   enable_hexoutput=yes
   libs=""
 fi
@@ -470,6 +471,7 @@ fi
 
 
 (echo "CHIP=$chip";
+ echo "ARCH=$arch";
  echo "EMULATION=$emulation";
  echo "CROSS=$cross";
  echo "MCU=$mcu";

src/main.c

@@ -1,7 +1,7 @@
 /*
  * main.c - main routine of Gnuk
  *
- * Copyright (C) 2010, 2011, 2012, 2013, 2015, 2016, 2017, 2018
+ * Copyright (C) 2010, 2011, 2012, 2013, 2015, 2016, 2017, 2018, 2021
  *               Free Software Initiative of Japan
  * Author: NIIBE Yutaka <gniibe@fsij.org>
  *
@@ -36,6 +36,11 @@
 #include "usb-cdc.h"
 #include "random.h"
 #ifdef GNU_LINUX_EMULATION
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
 #include <stdio.h>
 #include <stdlib.h>
 #define main emulated_main
@@ -372,6 +377,34 @@ main (int argc, const char *argv[])
   else
     flash_image_path = argv[1];
 
+  if (access (flash_image_path, F_OK) < 0)
+    {
+      int fd;
+      char buf[8192];
+
+      memset (buf, 0xff, sizeof buf);
+      memset (buf+4*1024, 0, 2);
+      fd = open (flash_image_path, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
+      if (fd < 0)
+	{
+	  perror ("creating flash file");
+	  exit (1);
+	}
+
+      if (write (fd, buf, sizeof buf) != sizeof buf)
+	{
+	  perror ("initializing flash file");
+	  close (fd);
+	  exit (1);
+	}
+
+      close (fd);
+    }
+
+  puts ("Gnuk (emulation with USBIP), a GnuPG USB Token implementation");
+  puts ("Copyright (C) 2021 Free Software Initiative of Japan");
+  puts ("This is free software under GPLv3+.");
+
   flash_addr = flash_init (flash_image_path);
   flash_addr_key_storage_start = (uint8_t *)flash_addr;
   flash_addr_data_storage_start = (uint8_t *)flash_addr + 4096;
@@ -563,11 +596,11 @@ gnuk_malloc_init (void)
 }
 
 static void *
-sbrk (size_t size)
+gnuk_sbrk (intptr_t size)
 {
   void *p = (void *)heap_p;
 
-  if ((size_t)(HEAP_END - heap_p) < size)
+  if ((HEAP_END - heap_p) < size)
     return NULL;
 
   heap_p += size;
@@ -603,7 +636,7 @@ gnuk_malloc (size_t size)
     {
       if (m == NULL)
 	{
-	  m = (struct mem_head *)sbrk (size);
+	  m = (struct mem_head *)gnuk_sbrk (size);
 	  if (m)
 	    m->size = size;
 	  break;