84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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#include <time.h>
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#include <string>
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#include <cstring>
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#include <cassert>
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#include <cstdio>
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#include <pthread.h>
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namespace drvutil {
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// strerror has to be the most overcomplicated function imaginable. The simple
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// version, 'strerror', is not thread-safe, and the improved versions are all
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// incompatible from OS to OS. Even different versions of linux aren't
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// compatible. A lot of conditional compilation is needed.
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inline static void strerror_helper(int status, int errnum, char errbuf[256]) {
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if (status != 0) {
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snprintf(errbuf, 256, "unknown errno %d", errnum);
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}
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}
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inline static void strerror_helper(const char *result, int errnum, char errbuf[256]) {
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if (result != errbuf) {
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snprintf(errbuf, 256, "%s", result);
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}
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}
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void strerror_safe(int errnum, char errbuf[256]) {
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auto rval = strerror_r(errnum, errbuf, 256);
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strerror_helper(rval, errnum, errbuf);
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}
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std::string strerror_str(int errnum) {
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char buf[256];
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strerror_safe(errnum, buf);
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return buf;
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}
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class MonoClock {
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private:
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struct timespec base_;
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public:
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MonoClock() {
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int status = clock_gettime(CLOCK_MONOTONIC, &base_);
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assert(status == 0);
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}
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double get() {
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struct timespec t;
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int status = clock_gettime(CLOCK_MONOTONIC, &t);
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assert(status == 0);
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double tv_sec = t.tv_sec - base_.tv_sec;
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double tv_nsec = t.tv_nsec - base_.tv_nsec;
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return tv_sec + (tv_nsec * 1.0E-9);
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}
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};
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static MonoClock monoclock;
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double get_monotonic_clock() {
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return monoclock.get();
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}
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void console_write(const std::u32string &cps) {
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std::string utf8 = drvutil::utf32_to_utf8(cps);
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write(1, utf8.c_str(), utf8.size());
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}
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std::u32string console_read() {
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std::u32string result;
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char buffer[512];
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int nread = read(0, buffer, 512);
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if (nread > 0) {
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std::string_view s(buffer, nread);
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result = drvutil::utf8_to_utf32(s, nullptr);
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}
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return result;
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}
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} // namespace drvutil
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