# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/embutils/z-mkswap.patch
# Copyright (C) 2024 - 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

--- embutils-0.19/mkswap.c.vanilla	2024-01-14 14:30:38.427442305 +0100
+++ embutils-0.19/mkswap.c	2024-01-14 14:58:21.016511460 +0100
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+void pf(const char*msg) { write(2,msg,strlen(msg)); }
+void die(const char*msg) { pf(msg); exit(1); }
+
+int main(int argc,char *argv[]) {
+  if (argc <= 1) die("Usage: mkswap swap\n");
+
+  int fd = open(argv[1], O_RDWR), pagesize = sysconf(_SC_PAGE_SIZE);
+  if (fd <= 0) die("mkswap: error opening swap\n");
+
+  off_t len = lseek(fd, 0, SEEK_END);
+  if (len < 0) die("mkswap: error sizing swap\n");
+
+  unsigned int pages = (len / pagesize) - 1, swap[129] = {};
+
+  swap[0] = 1;
+  swap[1] = pages;
+
+  lseek(fd, 1024, SEEK_SET);
+  write(fd, swap, 129 * sizeof(unsigned int));
+  lseek(fd, pagesize - 10, SEEK_SET);
+  write(fd, "SWAPSPACE2", 10);
+  syncfs(fd);
+
+  printf("Swap size: %luk\n", pages * (unsigned long)(pagesize / 1024));
+
+  return 0;
+}
--- embutils-0.19/Makefile.vanilla	2024-01-14 14:30:42.583442478 +0100
+++ embutils-0.19/Makefile	2024-01-14 14:30:46.979442661 +0100
@@ -15,7 +15,7 @@
 sosrm soscp sosmv sosln soslns sleep2 uniq tr mesg du \
 uuencode uudecode nohup nice cmp mktemp truncate test date \
 printenv chrootuid renice \
-free losetup switch_root readlink swapon
+free losetup switch_root readlink swapon mkswap
 
 OS:=$(shell uname)
 ifeq ($(OS),Linux)