Joe Onorato | 1754d74 | 2016-11-21 17:51:35 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "printer.h" |
| 18 | |
| 19 | #include <unistd.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
Joe Onorato | b69b95f | 2016-12-16 13:16:40 -0800 | [diff] [blame] | 22 | #include <stdarg.h> |
Joe Onorato | 1754d74 | 2016-11-21 17:51:35 -0800 | [diff] [blame] | 23 | |
| 24 | #define INITIAL_BUF_SIZE (16*1024) |
| 25 | |
| 26 | char const* SPACES = " "; |
| 27 | const int SPACE_COUNT = strlen(SPACES); |
| 28 | |
| 29 | Out::Out(int fd) |
| 30 | :mOut(fd == STDOUT_FILENO ? stdout : fdopen(fd, "w")), |
| 31 | mBufSize(INITIAL_BUF_SIZE), |
| 32 | mBuf((char*)malloc(INITIAL_BUF_SIZE)), |
| 33 | mIndent(0), |
| 34 | mPendingIndent(false) |
| 35 | { |
| 36 | } |
| 37 | |
| 38 | Out::~Out() |
| 39 | { |
| 40 | fclose(mOut); |
| 41 | } |
| 42 | |
| 43 | int |
| 44 | Out::reallocate(int size) |
| 45 | { |
| 46 | if (size > mBufSize) { |
| 47 | char* p = (char*)malloc(size); |
| 48 | if (p != NULL) { |
| 49 | free(mBuf); |
| 50 | mBufSize = size; |
| 51 | mBuf = p; |
| 52 | return size; |
| 53 | } |
| 54 | } |
| 55 | return mBufSize; |
| 56 | } |
| 57 | |
| 58 | void |
| 59 | Out::printf(const char* format, ...) |
| 60 | { |
| 61 | if (mPendingIndent) { |
| 62 | print_indent(); |
| 63 | mPendingIndent = false; |
| 64 | } |
| 65 | |
| 66 | int len; |
| 67 | |
| 68 | va_list args; |
| 69 | va_start(args, format); |
| 70 | |
| 71 | len = vsnprintf(mBuf, mBufSize, format, args); |
Joe Onorato | 5a991ad | 2016-12-20 08:21:38 -0800 | [diff] [blame] | 72 | va_end(args); |
Joe Onorato | 1754d74 | 2016-11-21 17:51:35 -0800 | [diff] [blame] | 73 | bool truncated = (len >= mBufSize) && (reallocate(len) < len); |
Joe Onorato | 5a991ad | 2016-12-20 08:21:38 -0800 | [diff] [blame] | 74 | |
| 75 | va_start(args, format); |
Joe Onorato | 1754d74 | 2016-11-21 17:51:35 -0800 | [diff] [blame] | 76 | len = vsnprintf(mBuf, mBufSize, format, args); |
| 77 | va_end(args); |
| 78 | |
| 79 | if (len > 0) { |
| 80 | if (mIndent == 0) { |
| 81 | fwrite(mBuf, len, 1, mOut); |
| 82 | } else { |
| 83 | char* last = mBuf; |
| 84 | char* p; |
| 85 | do { |
| 86 | p = strchr(last, '\n'); |
| 87 | int size = p != NULL ? p - last + 1 : strlen(last); |
| 88 | fwrite(last, size, 1, mOut); |
| 89 | if (p != NULL) { |
| 90 | if (p[1] == '\0') { |
| 91 | mPendingIndent = true; |
| 92 | } else { |
| 93 | print_indent(); |
| 94 | } |
| 95 | } |
| 96 | last = p+1; |
| 97 | } while (p != NULL); |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | void |
| 103 | Out::indent() |
| 104 | { |
| 105 | mPendingIndent = true; |
| 106 | mIndent += 2; |
| 107 | } |
| 108 | |
| 109 | void |
| 110 | Out::dedent() |
| 111 | { |
| 112 | if (mIndent > 0) { |
| 113 | mIndent -= 2; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | void |
| 118 | Out::print_indent() |
| 119 | { |
| 120 | #if 0 |
| 121 | fprintf(mOut, "[%d]", mIndent); |
| 122 | #else |
| 123 | int indent = mIndent; |
| 124 | while (indent > SPACE_COUNT) { |
| 125 | fwrite(SPACES, SPACE_COUNT, 1, mOut); |
| 126 | indent -= SPACE_COUNT; |
| 127 | } |
| 128 | fwrite(SPACES + SPACE_COUNT - indent, indent, 1, mOut); |
| 129 | #endif |
| 130 | } |