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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <string>
#include <vector>
#include <log/logcat.h>
static std::string unquote(const char*& cp, const char*& delim) {
if ((*cp == '\'') || (*cp == '"')) {
// KISS: Simple quotes. Do not handle the case
// of concatenation like "blah"foo'bar'
char quote = *cp++;
delim = strchr(cp, quote);
if (!delim) delim = cp + strlen(cp);
std::string str(cp, delim);
if (*delim) ++delim;
return str;
}
delim = strpbrk(cp, " \t\f\r\n");
if (!delim) delim = cp + strlen(cp);
return std::string(cp, delim);
}
static bool __android_logcat_parse(const char* command,
std::vector<std::string>& args,
std::vector<std::string>& envs) {
for (const char *delim, *cp = command; cp && *cp; cp = delim) {
while (isspace(*cp)) ++cp;
if ((args.size() == 0) && (*cp != '=') && !isdigit(*cp)) {
const char* env = cp;
while (isalnum(*cp) || (*cp == '_')) ++cp;
if (cp && (*cp == '=')) {
std::string str(env, ++cp);
str += unquote(cp, delim);
envs.push_back(str);
continue;
}
cp = env;
}
args.push_back(unquote(cp, delim));
if ((args.size() == 1) && (args[0] != "logcat") &&
(args[0] != "/system/bin/logcat")) {
return false;
}
}
return args.size() != 0;
}
FILE* android_logcat_popen(android_logcat_context* ctx, const char* command) {
*ctx = NULL;
std::vector<std::string> args;
std::vector<std::string> envs;
if (!__android_logcat_parse(command, args, envs)) return NULL;
std::vector<const char*> argv;
for (auto& str : args) {
argv.push_back(str.c_str());
}
argv.push_back(NULL);
std::vector<const char*> envp;
for (auto& str : envs) {
envp.push_back(str.c_str());
}
envp.push_back(NULL);
*ctx = create_android_logcat();
if (!*ctx) return NULL;
int fd = android_logcat_run_command_thread(
*ctx, argv.size() - 1, (char* const*)&argv[0], (char* const*)&envp[0]);
argv.clear();
args.clear();
envp.clear();
envs.clear();
if (fd < 0) {
android_logcat_destroy(ctx);
return NULL;
}
FILE* retval = fdopen(fd, "reb");
if (!retval) android_logcat_destroy(ctx);
return retval;
}
int android_logcat_pclose(android_logcat_context* ctx, FILE* output) {
if (*ctx) {
static const useconds_t wait_sample = 20000;
// Wait two seconds maximum
for (size_t retry = ((2 * 1000000) + wait_sample - 1) / wait_sample;
android_logcat_run_command_thread_running(*ctx) && retry; --retry) {
usleep(wait_sample);
}
}
if (output) fclose(output);
return android_logcat_destroy(ctx);
}
int android_logcat_system(const char* command) {
std::vector<std::string> args;
std::vector<std::string> envs;
if (!__android_logcat_parse(command, args, envs)) return -1;
std::vector<const char*> argv;
for (auto& str : args) {
argv.push_back(str.c_str());
}
argv.push_back(NULL);
std::vector<const char*> envp;
for (auto& str : envs) {
envp.push_back(str.c_str());
}
envp.push_back(NULL);
android_logcat_context ctx = create_android_logcat();
if (!ctx) return -1;
/* Command return value */
int retval = android_logcat_run_command(ctx, -1, -1, argv.size() - 1,
(char* const*)&argv[0],
(char* const*)&envp[0]);
/* destroy return value */
int ret = android_logcat_destroy(&ctx);
/* Paranoia merging any discrepancies between the two return values */
if (!ret) ret = retval;
return ret;
}
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