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authorNicolas Schodet2023-03-06 17:36:31 +0100
committerNicolas Schodet2023-03-06 17:36:31 +0100
commitd383f2bcdb6ff13cc562fce1ff55d826035debad (patch)
treef5cd0440869b8ba823fd254b361cdefe95e153b4 /lib/sbrk.c
parent8fce63fda48a6593870ffd3c584c9dd0808bc2c2 (diff)
Simplify source tree
Now just use make in the root directory to build.
Diffstat (limited to 'lib/sbrk.c')
-rw-r--r--lib/sbrk.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/lib/sbrk.c b/lib/sbrk.c
new file mode 100644
index 0000000..317a94b
--- /dev/null
+++ b/lib/sbrk.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2010 Nicolas Schodet
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/* The newlib sprintf use dynamic allocation for floating point. Therefore,
+ * the sbrk syscall should be provided.
+ *
+ * This works by taking memory above BSS and below stack. There is no
+ * collision detection as it whould not known what to do then. */
+
+extern char _end;
+
+void *
+_sbrk (int incr)
+{
+ static char *heap = 0;
+ char *base;
+ /* Initialise if first call. */
+ if (heap == 0)
+ heap = &_end;
+ /* Increment and return old heap base. */
+ base = heap;
+ heap += incr;
+ return base;
+}
+