95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// Helper functions for C / Python interface
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//
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// Copyright (C) 2016-2018 Kevin O'Connor <kevin@koconnor.net>
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//
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// This file may be distributed under the terms of the GNU GPLv3 license.
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#include <errno.h> // errno
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#include <stdarg.h> // va_start
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#include <stdint.h> // uint8_t
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#include <stdio.h> // fprintf
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#include <string.h> // strerror
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#include <time.h> // struct timespec
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#include "compiler.h" // __visible
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#include "pyhelper.h" // get_monotonic
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// Return the monotonic system time as a double
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double __visible
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get_monotonic(void)
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{
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struct timespec ts;
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int ret = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (ret) {
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report_errno("clock_gettime", ret);
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return 0.;
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}
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return (double)ts.tv_sec + (double)ts.tv_nsec * .000000001;
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}
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// Fill a 'struct timespec' with a system time stored in a double
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struct timespec
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fill_time(double time)
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{
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time_t t = time;
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return (struct timespec) {t, (time - t)*1000000000. };
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}
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static void
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default_logger(const char *msg)
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{
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fprintf(stderr, "%s\n", msg);
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}
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static void (*python_logging_callback)(const char *msg) = default_logger;
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void __visible
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set_python_logging_callback(void (*func)(const char *))
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{
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python_logging_callback = func;
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}
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// Log an error message
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void
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errorf(const char *fmt, ...)
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{
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char buf[512];
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va_list args;
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va_start(args, fmt);
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vsnprintf(buf, sizeof(buf), fmt, args);
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va_end(args);
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buf[sizeof(buf)-1] = '\0';
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python_logging_callback(buf);
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}
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// Report 'errno' in a message written to stderr
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void
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report_errno(char *where, int rc)
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{
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int e = errno;
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errorf("Got error %d in %s: (%d)%s", rc, where, e, strerror(e));
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}
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// Return a hex character for a given number
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#define GETHEX(x) ((x) < 10 ? '0' + (x) : 'a' + (x) - 10)
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// Translate a binary string into an ASCII string with escape sequences
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char *
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dump_string(char *outbuf, int outbuf_size, char *inbuf, int inbuf_size)
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{
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char *outend = &outbuf[outbuf_size-5], *o = outbuf;
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uint8_t *inend = (void*)&inbuf[inbuf_size], *p = (void*)inbuf;
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while (p < inend && o < outend) {
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uint8_t c = *p++;
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if (c > 31 && c < 127 && c != '\\') {
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*o++ = c;
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continue;
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}
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*o++ = '\\';
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*o++ = 'x';
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*o++ = GETHEX(c >> 4);
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*o++ = GETHEX(c & 0x0f);
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}
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*o = '\0';
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return outbuf;
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}
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