From 18da3ffcd7f3c8a0c5f790c801b5813503c2273d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 19:03:56 +0200
Subject: Adding upstream version 31+20240202.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 shared/strbuf.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 shared/strbuf.c

(limited to 'shared/strbuf.c')

diff --git a/shared/strbuf.c b/shared/strbuf.c
new file mode 100644
index 0000000..a69d914
--- /dev/null
+++ b/shared/strbuf.c
@@ -0,0 +1,128 @@
+/*
+ * libkmod - interface to kernel module operations
+ *
+ * Copyright (C) 2011-2013  ProFUSION embedded systems
+ * Copyright (C) 2014  Intel Corporation. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "util.h"
+#include "strbuf.h"
+
+#define BUF_STEP 128
+
+static bool buf_grow(struct strbuf *buf, size_t newsize)
+{
+	void *tmp;
+	size_t sz;
+
+	if (newsize <= buf->size)
+		return true;
+
+	if (newsize % BUF_STEP == 0)
+		sz = newsize;
+	else
+		sz = ((newsize / BUF_STEP) + 1) * BUF_STEP;
+
+	tmp = realloc(buf->bytes, sz);
+	if (sz > 0 && tmp == NULL)
+		return false;
+	buf->bytes = tmp;
+	buf->size = sz;
+	return true;
+}
+
+void strbuf_init(struct strbuf *buf)
+{
+	buf->bytes = NULL;
+	buf->size = 0;
+	buf->used = 0;
+}
+
+void strbuf_release(struct strbuf *buf)
+{
+	free(buf->bytes);
+}
+
+char *strbuf_steal(struct strbuf *buf)
+{
+	char *bytes;
+
+	bytes = realloc(buf->bytes, buf->used + 1);
+	if (!bytes) {
+		free(buf->bytes);
+		return NULL;
+	}
+	bytes[buf->used] = '\0';
+	return bytes;
+}
+
+const char *strbuf_str(struct strbuf *buf)
+{
+	if (!buf_grow(buf, buf->used + 1))
+		return NULL;
+	buf->bytes[buf->used] = '\0';
+	return buf->bytes;
+}
+
+bool strbuf_pushchar(struct strbuf *buf, char ch)
+{
+	if (!buf_grow(buf, buf->used + 1))
+		return false;
+	buf->bytes[buf->used] = ch;
+	buf->used++;
+	return true;
+}
+
+unsigned strbuf_pushchars(struct strbuf *buf, const char *str)
+{
+	unsigned int len;
+
+	assert(str != NULL);
+	assert(buf != NULL);
+
+	len = strlen(str);
+
+	if (!buf_grow(buf, buf->used + len))
+		return 0;
+
+	memcpy(buf->bytes + buf->used, str, len);
+	buf->used += len;
+
+	return len;
+}
+
+void strbuf_popchar(struct strbuf *buf)
+{
+	assert(buf->used > 0);
+	buf->used--;
+}
+
+void strbuf_popchars(struct strbuf *buf, unsigned n)
+{
+	assert(buf->used >= n);
+	buf->used -= n;
+}
+
+void strbuf_clear(struct strbuf *buf)
+{
+	buf->used = 0;
+}
+
-- 
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