Add a test for the printbuf functions.

tests/Makefile.am

@@ -20,6 +20,11 @@ test_cast_LDADD = $(LIBJSON_LA)
 test_parse_LDADD = $(LIBJSON_LA)
 
 TESTS = test1.test test2.test test4.test parse_int64.test test_null.test test_cast.test test_parse.test
+
+TESTS+= test_printbuf.test
+check_PROGRAMS+=test_printbuf
+test_printbuf_LDADD = $(LIBJSON_LA)
+
 EXTRA_DIST=
 EXTRA_DIST += $(TESTS)
 

tests/test_printbuf.c

@@ -0,0 +1,165 @@
+#include <assert.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#include "debug.h"
+#include "printbuf.h"
+
+static void test_basic_printbuf_memset(void);
+static void test_printbuf_memset_length(void);
+
+static void test_basic_printbuf_memset()
+{
+	struct printbuf *pb;
+	
+	printf("%s: starting test\n", __func__);
+	pb = printbuf_new();
+	sprintbuf(pb, "blue:%d", 1);
+	printbuf_memset(pb, -1, 'x', 52);
+	printf("Buffer contents:%.*s\n", printbuf_length(pb), pb->buf);
+	printbuf_free(pb);
+	printf("%s: end test\n", __func__);
+}
+
+static void test_printbuf_memset_length()
+{
+	struct printbuf *pb;
+
+	printf("%s: starting test\n", __func__);
+	pb = printbuf_new();
+	printbuf_memset(pb, -1, ' ', 0);
+	printbuf_memset(pb, -1, ' ', 0);
+	printbuf_memset(pb, -1, ' ', 0);
+	printbuf_memset(pb, -1, ' ', 0);
+	printbuf_memset(pb, -1, ' ', 0);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+	printbuf_memset(pb, -1, ' ', 2);
+	printbuf_memset(pb, -1, ' ', 4);
+	printbuf_memset(pb, -1, ' ', 6);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+	printbuf_memset(pb, -1, ' ', 6);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+	printbuf_memset(pb, -1, ' ', 8);
+	printbuf_memset(pb, -1, ' ', 10);
+	printbuf_memset(pb, -1, ' ', 10);
+	printbuf_memset(pb, -1, ' ', 10);
+	printbuf_memset(pb, -1, ' ', 20);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+
+	// No length change should occur
+	printbuf_memset(pb, 0, 'x', 30);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+
+	// This should extend it by one.
+	printbuf_memset(pb, 0, 'x', printbuf_length(pb) + 1);
+	printf("Buffer length: %d\n", printbuf_length(pb));
+
+	printbuf_free(pb);
+	printf("%s: end test\n", __func__);
+}
+
+static void test_printbuf_memappend(int *before_resize);
+static void test_printbuf_memappend(int *before_resize)
+{
+	struct printbuf *pb;
+	int initial_size;
+
+	printf("%s: starting test\n", __func__);
+	pb = printbuf_new();
+	printf("Buffer length: %d\n", printbuf_length(pb));
+
+	initial_size = pb->size;
+
+	while(pb->size == initial_size)
+	{
+		printbuf_memappend_fast(pb, "x", 1);
+	}
+	*before_resize = printbuf_length(pb) - 1;
+	printf("Appended %d bytes for resize: [%s]\n", *before_resize + 1, pb->buf);
+
+	printbuf_reset(pb);
+	printbuf_memappend_fast(pb, "bluexyz123", 3);
+	printf("Partial append: %d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	char with_nulls[] = { 'a', 'b', '\0', 'c' };
+	printbuf_reset(pb);
+	printbuf_memappend_fast(pb, with_nulls, sizeof(with_nulls));
+	printf("With embedded \\0 character: %d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	printbuf_free(pb);
+	pb = printbuf_new();
+	char *data = malloc(*before_resize);
+	memset(data, 'X', *before_resize);
+	printbuf_memappend_fast(pb, data, *before_resize);
+	printf("Append to just before resize: %d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	free(data);
+	printbuf_free(pb);
+
+	pb = printbuf_new();
+	data = malloc(*before_resize + 1);
+	memset(data, 'X', *before_resize + 1);
+	printbuf_memappend_fast(pb, data, *before_resize + 1);
+	printf("Append to just after resize: %d, [%s]\n", printbuf_length(pb), pb->buf);
+	
+	free(data);
+
+	printbuf_free(pb);
+	printf("%s: end test\n", __func__);
+}
+
+static void test_sprintbuf(int before_resize);
+static void test_sprintbuf(int before_resize)
+{
+	struct printbuf *pb;
+
+	printf("%s: starting test\n", __func__);
+	pb = printbuf_new();
+	printf("Buffer length: %d\n", printbuf_length(pb));
+
+	char *data = malloc(before_resize + 1 + 1);
+	memset(data, 'X', before_resize + 1 + 1);
+	data[before_resize + 1] = '\0';
+	sprintbuf(pb, "%s", data);
+	printf("sprintbuf to just after resize(%d+1): %d, [%s], strlen(buf)=%d\n", before_resize, printbuf_length(pb), pb->buf, strlen(pb->buf));
+
+	printbuf_reset(pb);
+	sprintbuf(pb, "plain");
+	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	sprintbuf(pb, "%d", 1);
+	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	sprintbuf(pb, "%d", INT_MAX);
+	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	sprintbuf(pb, "%d", INT_MIN);
+	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	sprintbuf(pb, "%s", "%s");
+	printf("%d, [%s]\n", printbuf_length(pb), pb->buf);
+
+	printbuf_free(pb);
+	printf("%s: end test\n", __func__);
+}
+
+int main(int argc, char **argv)
+{
+	int before_resize = 0;
+
+	mc_set_debug(1);
+
+	test_basic_printbuf_memset();
+	printf("========================================\n");
+	test_printbuf_memset_length();
+	printf("========================================\n");
+	test_printbuf_memappend(&before_resize);
+	printf("========================================\n");
+	test_sprintbuf(before_resize);
+	printf("========================================\n");
+
+	return 0;
+}

tests/test_printbuf.test

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Common definitions
+if test -z "$srcdir"; then
+    srcdir="${0%/*}"
+    test "$srcdir" = "$0" && srcdir=.
+    test -z "$srcdir" && srcdir=.
+fi
+. "$srcdir/test-defs.sh"
+
+run_output_test test_printbuf
+exit $?