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
28 #ifndef __BIONIC__
29 #define fdprintf dprintf
30 #endif
31
32 namespace android {
33
34 /*
35 * Implementation of Printer
36 */
Printer()37 Printer::Printer() {
38 // Intentionally left empty
39 }
40
~Printer()41 Printer::~Printer() {
42 // Intentionally left empty
43 }
44
printFormatLine(const char * format,...)45 void Printer::printFormatLine(const char* format, ...) {
46 va_list arglist;
47 va_start(arglist, format);
48
49 char* formattedString;
50
51 #ifndef USE_MINGW
52 if (vasprintf(&formattedString, format, arglist) < 0) { // returns -1 on error
53 ALOGE("%s: Failed to format string", __FUNCTION__);
54 return;
55 }
56 #else
57 return;
58 #endif
59
60 va_end(arglist);
61
62 printLine(formattedString);
63 free(formattedString);
64 }
65
66 /*
67 * Implementation of LogPrinter
68 */
LogPrinter(const char * logtag,android_LogPriority priority,const char * prefix,bool ignoreBlankLines)69 LogPrinter::LogPrinter(const char* logtag,
70 android_LogPriority priority,
71 const char* prefix,
72 bool ignoreBlankLines) :
73 mLogTag(logtag),
74 mPriority(priority),
75 mPrefix(prefix ?: ""),
76 mIgnoreBlankLines(ignoreBlankLines) {
77 }
78
printLine(const char * string)79 void LogPrinter::printLine(const char* string) {
80 if (string == NULL) {
81 ALOGW("%s: NULL string passed in", __FUNCTION__);
82 return;
83 }
84
85 if (mIgnoreBlankLines || (*string)) {
86 // Simple case: Line is not blank, or we don't care about printing blank lines
87 printRaw(string);
88 } else {
89 // Force logcat to print empty lines by adding prefixing with a space
90 printRaw(" ");
91 }
92 }
93
printRaw(const char * string)94 void LogPrinter::printRaw(const char* string) {
95 __android_log_print(mPriority, mLogTag, "%s%s", mPrefix, string);
96 }
97
98
99 /*
100 * Implementation of FdPrinter
101 */
FdPrinter(int fd,unsigned int indent,const char * prefix)102 FdPrinter::FdPrinter(int fd, unsigned int indent, const char* prefix) :
103 mFd(fd), mIndent(indent), mPrefix(prefix ?: "") {
104
105 if (fd < 0) {
106 ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, fd);
107 }
108
109 // <indent><prefix><line> -- e.g. '%-4s%s\n' for indent=4
110 snprintf(mFormatString, sizeof(mFormatString), "%%-%us%%s\n", mIndent);
111 }
112
printLine(const char * string)113 void FdPrinter::printLine(const char* string) {
114 if (string == NULL) {
115 ALOGW("%s: NULL string passed in", __FUNCTION__);
116 return;
117 } else if (mFd < 0) {
118 ALOGW("%s: File descriptor out of range (%d)", __FUNCTION__, mFd);
119 return;
120 }
121
122 #ifndef USE_MINGW
123 fdprintf(mFd, mFormatString, mPrefix, string);
124 #endif
125 }
126
127 /*
128 * Implementation of String8Printer
129 */
String8Printer(String8 * target,const char * prefix)130 String8Printer::String8Printer(String8* target, const char* prefix) :
131 mTarget(target),
132 mPrefix(prefix ?: "") {
133
134 if (target == NULL) {
135 ALOGW("%s: Target string was NULL", __FUNCTION__);
136 }
137 }
138
printLine(const char * string)139 void String8Printer::printLine(const char* string) {
140 if (string == NULL) {
141 ALOGW("%s: NULL string passed in", __FUNCTION__);
142 return;
143 } else if (mTarget == NULL) {
144 ALOGW("%s: Target string was NULL", __FUNCTION__);
145 return;
146 }
147
148 mTarget->append(string);
149 mTarget->append("\n");
150 }
151
152 /*
153 * Implementation of PrefixPrinter
154 */
PrefixPrinter(Printer & printer,const char * prefix)155 PrefixPrinter::PrefixPrinter(Printer& printer, const char* prefix) :
156 mPrinter(printer), mPrefix(prefix ?: "") {
157 }
158
printLine(const char * string)159 void PrefixPrinter::printLine(const char* string) {
160 mPrinter.printFormatLine("%s%s", mPrefix, string);
161 }
162
163 }; //namespace android
164