X-Git-Url: https://git.tokkee.org/?p=libjunos.git;a=blobdiff_plain;f=src%2Fstrbuf.c;fp=src%2Fstrbuf.c;h=c0b2a269c109f0a9b80c15a4bda3f3610e1841aa;hp=0000000000000000000000000000000000000000;hb=e2682945314d1a2abc8e9e879a80a72dcf638e9e;hpb=1564b261c7e0f4141a2ff8b0f9456758653d7458

diff --git a/src/strbuf.c b/src/strbuf.c
new file mode 100644
index 0000000..c0b2a26
--- /dev/null
+++ b/src/strbuf.c
@@ -0,0 +1,164 @@
+/*
+ * libJUNOS - src/strbuf.c
+ * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * String buffer object.
+ */
+
+#include "junos.h"
+
+#include <assert.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+/*
+ * private data structures
+ */
+
+struct junos_strbuf {
+	char  *string;
+	size_t size;
+	size_t pos;
+};
+
+/*
+ * private helper functions
+ */
+
+static int
+strbuf_resize(junos_strbuf_t *strbuf)
+{
+	char *tmp;
+
+	tmp = realloc(strbuf->string, 2 * strbuf->size);
+	if (! tmp)
+		return -1;
+
+	strbuf->string = tmp;
+	strbuf->size *= 2;
+
+	strbuf->string[strbuf->pos] = '\0';
+	return 0;
+} /* strbuf_resize */
+
+/*
+ * public API
+ */
+
+junos_strbuf_t *
+junos_strbuf_new(size_t size)
+{
+	junos_strbuf_t *strbuf;
+
+	strbuf = calloc(1, sizeof(*strbuf));
+	if (! strbuf)
+		return NULL;
+
+	if (! size)
+		return strbuf;
+
+	strbuf->string = malloc(size);
+	if (strbuf->string) {
+		strbuf->string[0] = '\0';
+		strbuf->size = size;
+	}
+
+	return strbuf;
+} /* junos_strbuf_new */
+
+void
+junos_strbuf_free(junos_strbuf_t *strbuf)
+{
+	if (! strbuf)
+		return;
+
+	free(strbuf->string);
+	free(strbuf);
+} /* junos_strbuf_free */
+
+ssize_t
+junos_strbuf_vsprintf(junos_strbuf_t *strbuf, const char *fmt, va_list ap)
+{
+	int status;
+
+	if (! strbuf)
+		return -1;
+
+	assert(strbuf->string[strbuf->pos] == '\0');
+
+	if (strbuf->pos >= strbuf->size)
+		if (strbuf_resize(strbuf))
+			return -1;
+
+	status = vsnprintf(strbuf->string + strbuf->pos,
+			strbuf->size - strbuf->pos, fmt, ap);
+
+	if (status < 0)
+		return status;
+
+	if ((size_t)status >= strbuf->size - strbuf->pos) {
+		strbuf_resize(strbuf);
+		return junos_strbuf_vsprintf(strbuf, fmt, ap);
+	}
+
+	strbuf->pos += (size_t)status;
+	return (ssize_t)strbuf->pos;
+} /* junos_strbuf_vsprintf */
+
+ssize_t
+junos_strbuf_sprintf(junos_strbuf_t *strbuf, const char *fmt, ...)
+{
+	va_list ap;
+	ssize_t status;
+
+	va_start(ap, fmt);
+	status = junos_strbuf_vsprintf(strbuf, fmt, ap);
+	va_end(ap);
+
+	return status;
+} /* junos_strbuf_sprintf */
+
+char *
+junos_strbuf_string(junos_strbuf_t *strbuf)
+{
+	if (! strbuf)
+		return NULL;
+	return strbuf->string;
+} /* junos_strbuf_string */
+
+size_t
+junos_strbuf_len(junos_strbuf_t *strbuf)
+{
+	if (! strbuf)
+		return 0;
+	return strbuf->pos;
+} /* junos_strbuf_string */
+
+/* vim: set tw=78 sw=4 ts=4 noexpandtab : */
+