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util.cc: refactor read_file (#21350)

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old-commit-hash: ac71384a28cda46126ea5d699697bb7ab701d972
This commit is contained in:
Dean Lee
2021-06-23 04:48:41 +08:00
committed by GitHub
parent f883cfec39
commit f03ca47c9c
1 changed files with 16 additions and 16 deletions
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32
selfdrive/common/util.cc
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@@ -54,26 +54,26 @@ int set_core_affinity(int core) {
namespace util {
std::string read_file(const std::string& fn) {
std::ifstream ifs(fn, std::ios::binary | std::ios::ate);
if (ifs) {
int pos = ifs.tellg();
if (pos > 0) {
std::string result;
result.resize(pos);
ifs.seekg(0, std::ios::beg);
ifs.read(result.data(), pos);
if (ifs) {
std::ifstream f(fn, std::ios::binary | std::ios::in);
if (f.is_open()) {
f.seekg(0, std::ios::end);
int size = f.tellg();
if (f.good() && size > 0) {
std::string result(size, '\0');
f.seekg(0, std::ios::beg);
f.read(result.data(), size);
// return either good() or has reached end-of-file (e.g. /sys/power/wakeup_count)
if (f.good() || f.eof()) {
result.resize(f.gcount());
return result;
}
}
// fallback for files created on read, e.g. procfs
std::stringstream buffer;
buffer << f.rdbuf();
return buffer.str();
}
ifs.close();
// fallback for files created on read, e.g. procfs
std::ifstream f(fn);
std::stringstream buffer;
buffer << f.rdbuf();
return buffer.str();
return std::string();
}
int read_files_in_dir(const std::string &path, std::map<std::string, std::string> *contents) {