1// Protocol Buffers - Google's data interchange format
2// Copyright 2012 Google Inc.  All rights reserved.
3// https://developers.google.com/protocol-buffers/
4//
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30
31// from google3/base/stringprintf_unittest.cc
32
33#include <google/protobuf/stubs/stringprintf.h>
34
35#include <cerrno>
36#include <string>
37
38#include <google/protobuf/testing/googletest.h>
39#include <gtest/gtest.h>
40
41namespace google {
42namespace protobuf {
43namespace {
44
45TEST(StringPrintfTest, Empty) {
46#if 0
47  // gcc 2.95.3, gcc 4.1.0, and gcc 4.2.2 all warn about this:
48  // warning: zero-length printf format string.
49  // so we do not allow them in google3.
50  EXPECT_EQ("", StringPrintf(""));
51#endif
52  EXPECT_EQ("", StringPrintf("%s", string().c_str()));
53  EXPECT_EQ("", StringPrintf("%s", ""));
54}
55
56TEST(StringPrintfTest, Misc) {
57// MSVC and mingw does not support $ format specifier.
58#if !defined(_MSC_VER) && !defined(__MINGW32__)
59  EXPECT_EQ("123hello w", StringPrintf("%3$d%2$s %1$c", 'w', "hello", 123));
60#endif  // !_MSC_VER
61}
62
63TEST(StringAppendFTest, Empty) {
64  string value("Hello");
65  const char* empty = "";
66  StringAppendF(&value, "%s", empty);
67  EXPECT_EQ("Hello", value);
68}
69
70TEST(StringAppendFTest, EmptyString) {
71  string value("Hello");
72  StringAppendF(&value, "%s", "");
73  EXPECT_EQ("Hello", value);
74}
75
76TEST(StringAppendFTest, String) {
77  string value("Hello");
78  StringAppendF(&value, " %s", "World");
79  EXPECT_EQ("Hello World", value);
80}
81
82TEST(StringAppendFTest, Int) {
83  string value("Hello");
84  StringAppendF(&value, " %d", 123);
85  EXPECT_EQ("Hello 123", value);
86}
87
88TEST(StringPrintfTest, Multibyte) {
89  // If we are in multibyte mode and feed invalid multibyte sequence,
90  // StringPrintf should return an empty string instead of running
91  // out of memory while trying to determine destination buffer size.
92  // see b/4194543.
93
94  char* old_locale = setlocale(LC_CTYPE, NULL);
95  // Push locale with multibyte mode
96  setlocale(LC_CTYPE, "en_US.utf8");
97
98  const char kInvalidCodePoint[] = "\375\067s";
99  string value = StringPrintf("%.*s", 3, kInvalidCodePoint);
100
101  // In some versions of glibc (e.g. eglibc-2.11.1, aka GRTEv2), snprintf
102  // returns error given an invalid codepoint. Other versions
103  // (e.g. eglibc-2.15, aka pre-GRTEv3) emit the codepoint verbatim.
104  // We test that the output is one of the above.
105  EXPECT_TRUE(value.empty() || value == kInvalidCodePoint);
106
107  // Repeat with longer string, to make sure that the dynamically
108  // allocated path in StringAppendV is handled correctly.
109  int n = 2048;
110  char* buf = new char[n+1];
111  memset(buf, ' ', n-3);
112  memcpy(buf + n - 3, kInvalidCodePoint, 4);
113  value =  StringPrintf("%.*s", n, buf);
114  // See GRTEv2 vs. GRTEv3 comment above.
115  EXPECT_TRUE(value.empty() || value == buf);
116  delete[] buf;
117
118  setlocale(LC_CTYPE, old_locale);
119}
120
121TEST(StringPrintfTest, NoMultibyte) {
122  // No multibyte handling, but the string contains funny chars.
123  char* old_locale = setlocale(LC_CTYPE, NULL);
124  setlocale(LC_CTYPE, "POSIX");
125  string value = StringPrintf("%.*s", 3, "\375\067s");
126  setlocale(LC_CTYPE, old_locale);
127  EXPECT_EQ("\375\067s", value);
128}
129
130TEST(StringPrintfTest, DontOverwriteErrno) {
131  // Check that errno isn't overwritten unless we're printing
132  // something significantly larger than what people are normally
133  // printing in their badly written PLOG() statements.
134  errno = ECHILD;
135  string value = StringPrintf("Hello, %s!", "World");
136  EXPECT_EQ(ECHILD, errno);
137}
138
139TEST(StringPrintfTest, LargeBuf) {
140  // Check that the large buffer is handled correctly.
141  int n = 2048;
142  char* buf = new char[n+1];
143  memset(buf, ' ', n);
144  buf[n] = 0;
145  string value = StringPrintf("%s", buf);
146  EXPECT_EQ(buf, value);
147  delete[] buf;
148}
149
150}  // anonymous namespace
151}  // namespace protobuf
152}  // namespace google
153