Remove strtok from adb.

Also fix android::base::Split to behave like Java, Python, and google3.

(cherry picked from commit 8d5fa6da44d56511b3e173bc463cbc65ff221b4a)

Change-Id: I9388ae37ee8dd4a4a6c2a9a19f068b70d9a78353

3 files changed, 11 insertions, 17 deletions

diff --git a/base/include/base/strings.h b/base/include/base/strings.h
index 3559342..5dbc5fb 100644
--- a/base/include/base/strings.h
+++ b/base/include/base/strings.h
@@ -27,8 +27,6 @@ namespace base {
 //
 // The string is split at each occurrence of a character in delimiters.
 //
-// Empty splits will be omitted. I.e. Split("a,,b", ",") -> {"a", "b"}
-//
 // The empty string is not a valid delimiter list.
 std::vector<std::string> Split(const std::string& s,
                                const std::string& delimiters);
diff --git a/base/strings.cpp b/base/strings.cpp
index 6f698d9..d3375d9 100644
--- a/base/strings.cpp
+++ b/base/strings.cpp
@@ -32,24 +32,17 @@ std::vector<std::string> Split(const std::string& s,
                                const std::string& delimiters) {
   CHECK_NE(delimiters.size(), 0U);
 
-  std::vector<std::string> split;
-  if (s.size() == 0) {
-    // Split("", d) returns {} rather than {""}.
-    return split;
-  }
+  std::vector<std::string> result;
 
   size_t base = 0;
   size_t found;
   do {
     found = s.find_first_of(delimiters, base);
-    if (found != base) {
-      split.push_back(s.substr(base, found - base));
-    }
-
+    result.push_back(s.substr(base, found - base));
     base = found + 1;
   } while (found != s.npos);
 
-  return split;
+  return result;
 }
 
 std::string Trim(const std::string& s) {
diff --git a/base/strings_test.cpp b/base/strings_test.cpp
index 1bf07a1..46a1ab5 100644
--- a/base/strings_test.cpp
+++ b/base/strings_test.cpp
@@ -23,7 +23,8 @@
 
 TEST(strings, split_empty) {
   std::vector<std::string> parts = android::base::Split("", ",");
-  ASSERT_EQ(0U, parts.size());
+  ASSERT_EQ(1U, parts.size());
+  ASSERT_EQ("", parts[0]);
 }
 
 TEST(strings, split_single) {
@@ -42,9 +43,10 @@ TEST(strings, split_simple) {
 
 TEST(strings, split_with_empty_part) {
   std::vector<std::string> parts = android::base::Split("foo,,bar", ",");
-  ASSERT_EQ(2U, parts.size());
+  ASSERT_EQ(3U, parts.size());
   ASSERT_EQ("foo", parts[0]);
-  ASSERT_EQ("bar", parts[1]);
+  ASSERT_EQ("", parts[1]);
+  ASSERT_EQ("bar", parts[2]);
 }
 
 TEST(strings, split_null_char) {
@@ -65,9 +67,10 @@ TEST(strings, split_any) {
 
 TEST(strings, split_any_with_empty_part) {
   std::vector<std::string> parts = android::base::Split("foo:,bar", ",:");
-  ASSERT_EQ(2U, parts.size());
+  ASSERT_EQ(3U, parts.size());
   ASSERT_EQ("foo", parts[0]);
-  ASSERT_EQ("bar", parts[1]);
+  ASSERT_EQ("", parts[1]);
+  ASSERT_EQ("bar", parts[2]);
 }
 
 TEST(strings, trim_empty) {