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Core/Src/sysmem.c

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+/**
+ ******************************************************************************
+ * @file      sysmem.c
+ * @author    Auto-generated by STM32CubeIDE
+ * @brief     STM32CubeIDE Minimal System Memory calls file
+ *
+ *            For more information about which c-functions
+ *            need which of these lowlevel functions
+ *            please consult the Newlib libc-manual
+ ******************************************************************************
+ * @attention
+ *
+ * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
+ * All rights reserved.</center></h2>
+ *
+ * This software component is licensed by ST under BSD 3-Clause license,
+ * the "License"; You may not use this file except in compliance with the
+ * License. You may obtain a copy of the License at:
+ *                        opensource.org/licenses/BSD-3-Clause
+ *
+ ******************************************************************************
+ */
+
+/* Includes */
+#include <errno.h>
+#include <stdio.h>
+
+/* Variables */
+extern int errno;
+register char * stack_ptr asm("sp");
+
+/* Functions */
+
+/**
+ _sbrk
+ Increase program data space. Malloc and related functions depend on this
+**/
+caddr_t _sbrk(int incr)
+{
+	extern char end asm("end");
+	static char *heap_end;
+	char *prev_heap_end;
+
+	if (heap_end == 0)
+		heap_end = &end;
+
+	prev_heap_end = heap_end;
+	if (heap_end + incr > stack_ptr)
+	{
+		errno = ENOMEM;
+		return (caddr_t) -1;
+	}
+
+	heap_end += incr;
+
+	return (caddr_t) prev_heap_end;
+}
+