util as a directoryethomson/util_as_a_directory

1 files changed, 119 insertions, 0 deletions

diff --git a/util/allocators/stdalloc.c b/util/allocators/stdalloc.c
new file mode 100644
index 000000000..c4938e32b
--- /dev/null
+++ b/util/allocators/stdalloc.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+
+#include "stdalloc.h"
+
+static void *stdalloc__malloc(size_t len, const char *file, int line)
+{
+	void *ptr = malloc(len);
+
+	GIT_UNUSED(file);
+	GIT_UNUSED(line);
+
+	if (!ptr) git_error_set_oom();
+	return ptr;
+}
+
+static void *stdalloc__calloc(size_t nelem, size_t elsize, const char *file, int line)
+{
+	void *ptr = calloc(nelem, elsize);
+
+	GIT_UNUSED(file);
+	GIT_UNUSED(line);
+
+	if (!ptr) git_error_set_oom();
+	return ptr;
+}
+
+static char *stdalloc__strdup(const char *str, const char *file, int line)
+{
+	char *ptr = strdup(str);
+
+	GIT_UNUSED(file);
+	GIT_UNUSED(line);
+
+	if (!ptr) git_error_set_oom();
+	return ptr;
+}
+
+static char *stdalloc__strndup(const char *str, size_t n, const char *file, int line)
+{
+	size_t length = 0, alloclength;
+	char *ptr;
+
+	length = p_strnlen(str, n);
+
+	if (GIT_ADD_SIZET_OVERFLOW(&alloclength, length, 1) ||
+		!(ptr = stdalloc__malloc(alloclength, file, line)))
+		return NULL;
+
+	if (length)
+		memcpy(ptr, str, length);
+
+	ptr[length] = '\0';
+
+	return ptr;
+}
+
+static char *stdalloc__substrdup(const char *start, size_t n, const char *file, int line)
+{
+	char *ptr;
+	size_t alloclen;
+
+	if (GIT_ADD_SIZET_OVERFLOW(&alloclen, n, 1) ||
+		!(ptr = stdalloc__malloc(alloclen, file, line)))
+		return NULL;
+
+	memcpy(ptr, start, n);
+	ptr[n] = '\0';
+	return ptr;
+}
+
+static void *stdalloc__realloc(void *ptr, size_t size, const char *file, int line)
+{
+	void *new_ptr = realloc(ptr, size);
+
+	GIT_UNUSED(file);
+	GIT_UNUSED(line);
+
+	if (!new_ptr) git_error_set_oom();
+	return new_ptr;
+}
+
+static void *stdalloc__reallocarray(void *ptr, size_t nelem, size_t elsize, const char *file, int line)
+{
+	size_t newsize;
+
+	if (GIT_MULTIPLY_SIZET_OVERFLOW(&newsize, nelem, elsize))
+		return NULL;
+
+	return stdalloc__realloc(ptr, newsize, file, line);
+}
+
+static void *stdalloc__mallocarray(size_t nelem, size_t elsize, const char *file, int line)
+{
+	return stdalloc__reallocarray(NULL, nelem, elsize, file, line);
+}
+
+static void stdalloc__free(void *ptr)
+{
+	free(ptr);
+}
+
+int git_stdalloc_init_allocator(git_allocator *allocator)
+{
+	allocator->gmalloc = stdalloc__malloc;
+	allocator->gcalloc = stdalloc__calloc;
+	allocator->gstrdup = stdalloc__strdup;
+	allocator->gstrndup = stdalloc__strndup;
+	allocator->gsubstrdup = stdalloc__substrdup;
+	allocator->grealloc = stdalloc__realloc;
+	allocator->greallocarray = stdalloc__reallocarray;
+	allocator->gmallocarray = stdalloc__mallocarray;
+	allocator->gfree = stdalloc__free;
+	return 0;
+}