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130 lines
2.7 KiB
130 lines
2.7 KiB
4 months ago
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "printer.h"
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#define INITIAL_BUF_SIZE (16*1024)
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char const* SPACES = " ";
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const int SPACE_COUNT = strlen(SPACES);
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Out::Out(int fd)
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:mOut(fd == STDOUT_FILENO ? stdout : fdopen(fd, "w")),
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mBufSize(INITIAL_BUF_SIZE),
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mBuf((char*)malloc(INITIAL_BUF_SIZE)),
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mIndent(0),
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mPendingIndent(false)
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{
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}
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Out::~Out()
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{
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fclose(mOut);
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}
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int
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Out::reallocate(int size)
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{
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if (size > mBufSize) {
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char* p = (char*)malloc(size);
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if (p != NULL) {
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free(mBuf);
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mBufSize = size;
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mBuf = p;
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return size;
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}
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}
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return mBufSize;
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}
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void
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Out::printf(const char* format, ...)
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{
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if (mPendingIndent) {
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print_indent();
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mPendingIndent = false;
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}
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int len;
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va_list args;
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va_start(args, format);
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len = vsnprintf(mBuf, mBufSize, format, args);
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va_end(args);
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va_start(args, format);
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len = vsnprintf(mBuf, mBufSize, format, args);
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va_end(args);
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if (len > 0) {
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if (mIndent == 0) {
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fwrite(mBuf, len, 1, mOut);
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} else {
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char* last = mBuf;
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char* p;
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do {
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p = strchr(last, '\n');
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int size = p != NULL ? p - last + 1 : strlen(last);
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fwrite(last, size, 1, mOut);
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if (p != NULL) {
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if (p[1] == '\0') {
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mPendingIndent = true;
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} else {
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print_indent();
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}
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}
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last = p+1;
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} while (p != NULL);
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}
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}
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}
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void
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Out::indent()
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{
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mPendingIndent = true;
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mIndent += 2;
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}
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void
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Out::dedent()
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{
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if (mIndent > 0) {
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mIndent -= 2;
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}
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}
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void
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Out::print_indent()
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{
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#if 0
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fprintf(mOut, "[%d]", mIndent);
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#else
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int indent = mIndent;
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while (indent > SPACE_COUNT) {
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fwrite(SPACES, SPACE_COUNT, 1, mOut);
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indent -= SPACE_COUNT;
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}
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fwrite(SPACES + SPACE_COUNT - indent, indent, 1, mOut);
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#endif
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}
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