1/*
2 * Copyright (C) 2013 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#define LOG_TAG "Printer"
18// #define LOG_NDEBUG 0
19
20#include <utils/Printer.h>
21#include <utils/String8.h>
22#include <utils/Log.h>
23
24#include <string.h>
25#include <stdio.h>
26#include <stdlib.h>
27
28namespace android {
29
30/*
31 * Implementation of Printer
32 */
33Printer::Printer() {
34    // Intentionally left empty
35}
36
37Printer::~Printer() {
38    // Intentionally left empty
39}
40
41void Printer::printFormatLine(const char* format, ...) {
42    va_list arglist;
43    va_start(arglist, format);
44
45    char* formattedString;
46
47#ifndef USE_MINGW
48    if (vasprintf(&formattedString, format, arglist) < 0) { // returns -1 on error
49        ALOGE("%s: Failed to format string", __FUNCTION__);
50        return;
51    }
52#else
53    return;
54#endif
55
56    va_end(arglist);
57
58    printLine(formattedString);
59    free(formattedString);
60}
61
62/*
63 * Implementation of LogPrinter
64 */
65LogPrinter::LogPrinter(const char* logtag,
66                       android_LogPriority priority,
67                       const char* prefix,
68                       bool ignoreBlankLines) :
69        mLogTag(logtag),
70        mPriority(priority),
71        mPrefix(prefix ?: ""),
72        mIgnoreBlankLines(ignoreBlankLines) {
73}
74
75void LogPrinter::printLine(const char* string) {
76    if (string == NULL) {
77        ALOGW("%s: NULL string passed in", __FUNCTION__);
78        return;
79    }
80
81    if (mIgnoreBlankLines || (*string)) {
82        // Simple case: Line is not blank, or we don't care about printing blank lines
83        printRaw(string);
84    } else {
85        // Force logcat to print empty lines by adding prefixing with a space
86        printRaw(" ");
87    }
88}
89
90void LogPrinter::printRaw(const char* string) {
91    __android_log_print(mPriority, mLogTag, "%s%s", mPrefix, string);
92}
93
94
95/*
96 * Implementation of FdPrinter
97 */
98FdPrinter::FdPrinter(int fd, unsigned int indent, const char* prefix) :
99        mFd(fd), mIndent(indent), mPrefix(prefix ?: "") {
100
101    if (fd < 0) {
102        ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, fd);
103    }
104
105    // <indent><prefix><line> -- e.g. '%-4s%s\n' for indent=4
106    snprintf(mFormatString, sizeof(mFormatString), "%%-%us%%s\n", mIndent);
107}
108
109void FdPrinter::printLine(const char* string) {
110    if (string == NULL) {
111        ALOGW("%s: NULL string passed in", __FUNCTION__);
112        return;
113    } else if (mFd < 0) {
114        ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, mFd);
115        return;
116    }
117
118#ifndef USE_MINGW
119    dprintf(mFd, mFormatString, mPrefix, string);
120#endif
121}
122
123/*
124 * Implementation of String8Printer
125 */
126String8Printer::String8Printer(String8* target, const char* prefix) :
127        mTarget(target),
128        mPrefix(prefix ?: "") {
129
130    if (target == NULL) {
131        ALOGW("%s: Target string was NULL", __FUNCTION__);
132    }
133}
134
135void String8Printer::printLine(const char* string) {
136    if (string == NULL) {
137        ALOGW("%s: NULL string passed in", __FUNCTION__);
138        return;
139    } else if (mTarget == NULL) {
140        ALOGW("%s: Target string was NULL", __FUNCTION__);
141        return;
142    }
143
144    mTarget->append(mPrefix);
145    mTarget->append(string);
146    mTarget->append("\n");
147}
148
149/*
150 * Implementation of PrefixPrinter
151 */
152PrefixPrinter::PrefixPrinter(Printer& printer, const char* prefix) :
153        mPrinter(printer), mPrefix(prefix ?: "") {
154}
155
156void PrefixPrinter::printLine(const char* string) {
157    mPrinter.printFormatLine("%s%s", mPrefix, string);
158}
159
160}; //namespace android
161