qdevice: Add functions to manipulate dynar string

Signed-off-by: Jan Friesse <jfriesse@redhat.com>

qdevices/dynar-str.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * All rights reserved.
+ *
+ * Author: Jan Friesse (jfriesse@redhat.com)
+ *
+ * This software licensed under BSD license, the text of which follows:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of the Red Hat, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "dynar-str.h"
+
+int
+dynar_str_cpy(struct dynar *dest, const char *str)
+{
+
+	if (strlen(str) > dynar_max_size(dest)) {
+		return (-1);
+	}
+
+	dynar_clean(dest);
+
+	return (dynar_str_cat(dest, str));
+}
+
+int
+dynar_str_cat(struct dynar *dest, const char *str)
+{
+
+	return (dynar_cat(dest, str, strlen(str)));
+}
+
+int
+dynar_str_catf(struct dynar *dest, const char *format, ...)
+{
+	int to_write;
+	int written;
+	va_list ap;
+	size_t allocated;
+	char buf;
+	char *p;
+
+	/*
+	 * Find out how much bytes is needed
+	 */
+	va_start(ap, format);
+	to_write = vsnprintf(&buf, sizeof(buf), format, ap);
+	va_end(ap);
+
+	if (to_write < 0) {
+		return (-1);
+	}
+
+	if (to_write < sizeof(buf)) {
+		/*
+		 * Writing 1 byte string (snprintf writes also '\0') means string is empty
+		 */
+
+		return (0);
+	}
+
+	allocated = to_write + 1;
+	if (dynar_prealloc(dest, allocated) != 0) {
+		return (-1);
+	}
+
+	p = dynar_data(dest) + dynar_size(dest);
+
+	va_start(ap, format);
+	written = vsnprintf(p, allocated, format, ap);
+	va_end(ap);
+
+	if (written >= allocated) {
+		return (-1);
+	}
+
+	dest->size += written;
+
+	return (written);
+}

qdevices/dynar-str.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * All rights reserved.
+ *
+ * Author: Jan Friesse (jfriesse@redhat.com)
+ *
+ * This software licensed under BSD license, the text of which follows:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of the Red Hat, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+#ifndef _DYNAR_STR_H_
+#define _DYNAR_STR_H_
+
+#include "dynar.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int		dynar_str_cpy(struct dynar *dest, const char *str);
+
+extern int		dynar_str_cat(struct dynar *dest, const char *str);
+
+extern int		dynar_str_catf(struct dynar *dest, const char *format, ...)
+    __attribute__((__format__(__printf__, 2, 3)));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _DYNAR_STR_H_ */

qdevices/test-dynar.c

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * All rights reserved.
+ *
+ * Author: Jan Friesse (jfriesse@redhat.com)
+ *
+ * This software licensed under BSD license, the text of which follows:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of the Red Hat, Inc. nor the names of its
+ *   contributors may be used to endorse or promote products derived from this
+ *   software without specific prior written permission.
+ *
+ * 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 OWNER 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.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+
+#include "dynar.h"
+#include "dynar-str.h"
+
+int
+main(void)
+{
+	struct dynar str;
+
+	dynar_init(&str, 3);
+	assert(dynar_cat(&str, "a", 1) == 0);
+	assert(dynar_size(&str) == 1);
+	assert(dynar_cat(&str, "b", 1) == 0);
+	assert(dynar_size(&str) == 2);
+	assert(dynar_cat(&str, "c", 1) == 0);
+	assert(dynar_size(&str) == 3);
+	assert(dynar_cat(&str, "d", 1) != 0);
+	assert(memcmp(dynar_data(&str), "abc", 3) == 0);
+
+	dynar_clean(&str);
+	assert(dynar_size(&str) == 0);
+	dynar_set_max_size(&str, 4);
+	assert(dynar_cat(&str, "a", 1) == 0);
+	assert(dynar_size(&str) == 1);
+	assert(memcmp(dynar_data(&str), "a", 1) == 0);
+	assert(dynar_cat(&str, "b", 1) == 0);
+	assert(dynar_size(&str) == 2);
+	assert(dynar_cat(&str, "c", 1) == 0);
+	assert(dynar_size(&str) == 3);
+	assert(dynar_cat(&str, "d", 1) == 0);
+	assert(dynar_size(&str) == 4);
+	assert(memcmp(dynar_data(&str), "abcd", 4) == 0);
+
+	assert(dynar_str_cpy(&str, "e") == 0);
+	assert(dynar_size(&str) == 1);
+	assert(memcmp(dynar_data(&str), "e", 1) == 0);
+
+	assert(dynar_str_cpy(&str, "fgh") == 0);
+	assert(dynar_size(&str) == 3);
+	assert(memcmp(dynar_data(&str), "fgh", 3) == 0);
+
+	assert(dynar_str_cpy(&str, "fghi") == 0);
+	assert(dynar_size(&str) == 4);
+	assert(memcmp(dynar_data(&str), "fghi", 4) == 0);
+
+	assert(dynar_str_cpy(&str, "fghij") != 0);
+	assert(dynar_size(&str) == 4);
+	assert(dynar_str_cat(&str, "a") != 0);
+
+	assert(dynar_str_cpy(&str, "") == 0);
+	assert(dynar_size(&str) == 0);
+
+	assert(dynar_str_cat(&str, "a") == 0);
+	assert(dynar_size(&str) == 1);
+	assert(memcmp(dynar_data(&str), "a", 1) == 0);
+
+	assert(dynar_str_cat(&str, "b") == 0);
+	assert(dynar_size(&str) == 2);
+	assert(memcmp(dynar_data(&str), "ab", 2) == 0);
+
+	assert(dynar_str_cat(&str, "cd") == 0);
+	assert(dynar_size(&str) == 4);
+	assert(memcmp(dynar_data(&str), "abcb", 1) == 0);
+
+	assert(dynar_str_cpy(&str, "") == 0);
+	assert(dynar_str_catf(&str, "%s", "a") == 1);
+	assert(memcmp(dynar_data(&str), "a", 1) == 0);
+	assert(dynar_str_catf(&str, "%s", "ab") == 2);
+	assert(memcmp(dynar_data(&str), "aab", 3) == 0);
+	assert(dynar_str_cpy(&str, "") == 0);
+	assert(dynar_str_catf(&str, "%s", "abc") == 3);
+	assert(dynar_str_cpy(&str, "") == 0);
+	assert(dynar_str_catf(&str, "%s", "abcd") == -1);
+	assert(dynar_str_cpy(&str, "a") == 0);
+	assert(dynar_str_catf(&str, "%s", "") == 0);
+	assert(memcmp(dynar_data(&str), "a", 1) == 0);
+
+	dynar_destroy(&str);
+	dynar_init(&str, 5);
+	assert(dynar_str_catf(&str, "%s", "abcd") == 4);
+	dynar_destroy(&str);
+	dynar_init(&str, 5);
+	assert(dynar_str_catf(&str, "%s", "") == 0);
+	assert(dynar_str_catf(&str, "%s", "abc") == 3);
+	assert(dynar_str_catf(&str, "%s", "d") == 1);
+	assert(memcmp(dynar_data(&str), "abcd", 4) == 0);
+	dynar_destroy(&str);
+
+	return (0);
+}