Basic streambuf implementation.
Needed to finish the ostream. We are not expected to use this class a
lot since we are going to rely on the stdio implementation for all the
work.
Still needed to make the compiler happy but did not spent too much effort on it.
For instance only output buffer operations are supported.
diff --git a/include/streambuf b/include/streambuf
new file mode 100644
index 0000000..f83dd2f
--- /dev/null
+++ b/include/streambuf
@@ -0,0 +1,165 @@
+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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 ANDROID_ASTL_STREAMBUF__
+#define ANDROID_ASTL_STREAMBUF__
+
+#include <char_traits.h>
+
+namespace std {
+
+/**
+ * Basic implementation of streambuf. The STL standard defines a
+ * basic_streambuf template that gets specialized for char and
+ * wchar. Since Android supports only char, we don't use a template
+ * here.
+ * Only output ops are supported.
+ * There are only 2 public entry points:
+ * - sputc
+ * - sputn
+ */
+
+class streambuf
+{
+ public:
+ typedef char_traits traits_type;
+ typedef traits_type::char_type char_type;
+ typedef traits_type::int_type int_type;
+ typedef streampos pos_type;
+ typedef streamoff off_type;
+
+ public:
+ virtual ~streambuf();
+
+ /**
+ * Entry points for derived buffer functions. The public
+ * version pubfoo dispatch to the protected foo member
+ * functions.
+ */
+ int pubsync() { return this->sync(); }
+
+ /**
+ * Entry point for all single-character output functions. If a
+ * write position is available (buffer not full), stores c at that
+ * position, incr the position and return
+ * traits.::to_int_type(c). If no position is available returns
+ * overflow(c).
+ */
+ int_type sputc(char_type c) {
+ int_type ret;
+
+ if (this->pptr() < this->epptr()) {
+ *this->pptr() = c;
+ this->pbump(1);
+ return traits_type::to_int_type(c);
+ } else {
+ ret = this->overflow(traits_type::to_int_type(c));
+ }
+ return ret;
+ }
+
+ /**
+ * Write str[0] to str[n-1] to output sequence. Stops if sputc
+ * would return traits_type::eof().
+ * @param str A buffer area.
+ * @param nnum Maximum number of characters to write.
+ * @return The number of characters written.
+ */
+ streamsize sputn(const char_type* str, streamsize num) {
+ return this->xsputn(str, num);
+ }
+
+ protected:
+ streambuf();
+
+
+ /**
+ * Access to the put area.
+ * - pbase() returns the beginning pointer for the output sequence.
+ * - pptr() returns the next pointer for the output sequence.
+ * - epptr() returns the end pointer for the output sequence.
+ * - pbump(int) Advance the write postion in the output sequence.
+ */
+ char_type* pbase() const { return mPutBeg; }
+ char_type* pptr() const { return mPutCurr; }
+ char_type* epptr() const { return mPutEnd; }
+ void pbump(int num) {
+ if (mPutCurr + num > mPutCurr && mPutCurr + num <= mPutEnd) {
+ mPutCurr += num;
+ }
+ }
+
+ /**
+ * Set the 3 write pointers.
+ */
+ void setp(char_type* beg, char_type* end) {
+ if (end >= beg) {
+ mPutBeg = mPutCurr = beg;
+ mPutEnd = end;
+ }
+ }
+
+ /**
+ * Sync buffer array. Provided by derived class.
+ */
+ virtual int sync() { return 0; }
+
+ /**
+ * See sputn. Provided by derived class.
+ */
+ virtual streamsize xsputn(const char_type* str, streamsize num);
+
+ /**
+ * Consumes one char from the buffer, writes to the controlled
+ * sequence if possible. This is called when the buffer is
+ * full. Typically the impl will flush the buffer, write the
+ * character 'c'.
+ * Provided by derived class.
+ * @return traits::eof() in case of error, anything else otherwise.
+ */
+ virtual int_type overflow(int_type /* c */ = traits_type::eof())
+ { return traits_type::eof(); }
+
+ /**
+ * Minimal abstraction for an internal buffer.
+ * - put == output == write
+ */
+ char_type* mPutBeg; // Start of put area.
+ char_type* mPutCurr; // Current put area.
+ char_type* mPutEnd; // End of put area.
+
+ private:
+ // No copy constructors.
+ streambuf(const streambuf& sb);
+ streambuf& operator=(const streambuf&) { return *this; }
+};
+
+} // namespace std
+
+#endif
diff --git a/src/Android.mk b/src/Android.mk
index e555dab..c6c3d54 100644
--- a/src/Android.mk
+++ b/src/Android.mk
@@ -22,6 +22,7 @@
ios_base.cpp \
ios_pos_types.cpp \
ostream.cpp \
+ streambuf.cpp \
string.cpp
# Build the target lib
diff --git a/src/streambuf.cpp b/src/streambuf.cpp
new file mode 100644
index 0000000..0acebb3
--- /dev/null
+++ b/src/streambuf.cpp
@@ -0,0 +1,73 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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 <streambuf>
+#include <algorithm> // for min
+namespace std {
+
+// Implementation of the streambuf, common stuff for all the stream buffers.
+streambuf::streambuf()
+ : mPutBeg(0), mPutCurr(0), mPutEnd(0) { }
+
+streambuf::streambuf(const streambuf& sb)
+ : mPutBeg(sb.mPutBeg), mPutCurr(sb.mPutCurr), mPutEnd(sb.mPutEnd) { }
+
+streambuf::~streambuf() {}
+
+streamsize streambuf::xsputn(const char_type* str, streamsize num) {
+ streamsize written = 0;
+
+ while (written < num) {
+ const streamsize avail = this->epptr() - this->pptr();
+ if (avail) {
+ const streamsize remaining = num - written;
+ const streamsize len = std::min(avail, remaining);
+ traits_type::copy(this->pptr(), str, len);
+ written += len;
+ str += len;
+ this->pbump(len);
+ }
+
+ if (written < num) {
+ // Indicate to the impl that we overflown. Either the impl
+ // can increase its buffer and consume one character (in
+ // which case eof() is not returned) or it can't and we
+ // stop here.
+ int_type c = this->overflow(traits_type::to_int_type(*str));
+ if (!traits_type::eq_int_type(c, traits_type::eof())) {
+ ++written;
+ ++str;
+ } else {
+ break;
+ }
+ }
+ }
+ return written;
+}
+
+} // namespace std
diff --git a/tests/Android.mk b/tests/Android.mk
index 88dd282..5de2eb7 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -70,6 +70,7 @@
test_limits.cpp \
test_memory.cpp \
test_set.cpp \
+ test_streambuf.cpp \
test_string.cpp \
test_type_traits.cpp \
test_uninitialized.cpp \
diff --git a/tests/test_streambuf.cpp b/tests/test_streambuf.cpp
new file mode 100644
index 0000000..cc58abc
--- /dev/null
+++ b/tests/test_streambuf.cpp
@@ -0,0 +1,78 @@
+/* -*- c++ -*- */
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * 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.
+ *
+ * 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 "../include/streambuf"
+#ifndef ANDROID_ASTL_STREAMBUF__
+#error "Wrong header included!!"
+#endif
+#include "common.h"
+
+#include <char_traits.h>
+
+namespace android {
+using std::char_traits;
+
+class streambuf: public std::streambuf {
+ public:
+ streambuf() {
+ setp(mBuffer, mBuffer + sizeof(mBuffer));
+ char_traits::assign(mBuffer, sizeof(mBuffer), 'X');
+ }
+
+ char mBuffer[5];
+};
+
+bool testSputc() {
+ streambuf buf;
+
+ EXPECT_TRUE(buf.sputc('A') == 65);
+ EXPECT_TRUE(buf.sputc('B') == 66);
+ EXPECT_TRUE(buf.sputc('C') == 67);
+ EXPECT_TRUE(buf.sputc('D') == 68);
+ EXPECT_TRUE(buf.sputc('E') == 69);
+ EXPECT_TRUE(buf.sputc('F') == char_traits::eof());
+ EXPECT_TRUE(buf.sputc('G') == char_traits::eof());
+ return true;
+}
+
+bool testSputn() {
+ streambuf buf;
+
+ EXPECT_TRUE(buf.sputn("ABCDE", 5) == 5);
+ EXPECT_TRUE(buf.sputn("F", 1) == 0);
+ return true;
+}
+
+} // namespace android
+
+int main(int argc, char **argv){
+ FAIL_UNLESS(testSputc);
+ FAIL_UNLESS(testSputn);
+ return kPassed;
+}
