mirror of https://github.com/merbanan/rtl_433.git
229 lines
5.5 KiB
C
229 lines
5.5 KiB
C
/** @file
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Various utility functions for use by applications
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Copyright (C) 2015 Tommy Vestermark
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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*/
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#include "r_util.h"
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#include "fatal.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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void get_time_now(struct timeval *tv)
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{
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int ret = gettimeofday(tv, NULL);
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if (ret)
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perror("gettimeofday");
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}
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char *format_time_str(char *buf, char const *format, int with_tz, time_t time_secs)
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{
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time_t etime;
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struct tm tm_info;
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if (time_secs == 0) {
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time(&etime);
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}
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else {
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etime = time_secs;
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}
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#ifdef _WIN32 /* MinGW might have localtime_r but apparently not MinGW64 */
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localtime_s(&tm_info, &etime); // win32 doesn't have localtime_r()
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#else
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localtime_r(&etime, &tm_info); // thread-safe
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#endif
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if (!format || !*format)
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format = "%Y-%m-%d %H:%M:%S";
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size_t l = strftime(buf, LOCAL_TIME_BUFLEN, format, &tm_info);
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if (with_tz) {
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strftime(buf + l, LOCAL_TIME_BUFLEN - l, "%z", &tm_info);
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if (!strcmp(buf + l, "+0000"))
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strcpy(buf + l, "Z"); // NOLINT
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}
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return buf;
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}
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char *usecs_time_str(char *buf, char const *format, int with_tz, struct timeval *tv)
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{
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struct timeval now;
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struct tm tm_info;
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if (!tv) {
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tv = &now;
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get_time_now(tv);
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}
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time_t t_secs = tv->tv_sec;
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#ifdef _WIN32 /* MinGW might have localtime_r but apparently not MinGW64 */
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localtime_s(&tm_info, &t_secs); // win32 doesn't have localtime_r()
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#else
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localtime_r(&t_secs, &tm_info); // thread-safe
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#endif
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if (!format || !*format)
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format = "%Y-%m-%d %H:%M:%S";
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size_t l = strftime(buf, LOCAL_TIME_BUFLEN, format, &tm_info);
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l += snprintf(buf + l, LOCAL_TIME_BUFLEN - l, ".%06ld", (long)tv->tv_usec);
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if (with_tz) {
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strftime(buf + l, LOCAL_TIME_BUFLEN - l, "%z", &tm_info);
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if (!strcmp(buf + l, "+0000"))
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strcpy(buf + l, "Z"); // NOLINT
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}
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return buf;
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}
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char *sample_pos_str(float sample_file_pos, char *buf)
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{
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snprintf(buf, LOCAL_TIME_BUFLEN, "@%fs", sample_file_pos);
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return buf;
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}
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float celsius2fahrenheit(float celsius)
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{
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return celsius * (9.0f / 5.0f) + 32;
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}
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float fahrenheit2celsius(float fahrenheit)
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{
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return (fahrenheit - 32) * (5.0f / 9.0f);
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}
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float kmph2mph(float kmph)
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{
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return kmph * (1.0f / 1.609344f);
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}
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float mph2kmph(float mph)
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{
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return mph * 1.609344f;
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}
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float mm2inch(float mm)
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{
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return mm * 0.039370f;
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}
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float inch2mm(float inch)
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{
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return inch * 25.4f;
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}
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float kpa2psi(float kpa)
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{
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return kpa * (1.0f / 6.89475729f);
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}
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float psi2kpa(float psi)
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{
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return psi * 6.89475729f;
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}
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float hpa2inhg(float hpa)
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{
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return hpa * (1.0f / 33.8639f);
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}
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float inhg2hpa(float inhg)
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{
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return inhg * 33.8639f;
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}
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bool str_endswith(char const *restrict str, char const *restrict suffix)
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{
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if (!suffix) {
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return true;
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}
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if (!str) {
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return false;
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}
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int str_len = strlen(str);
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int suffix_len = strlen(suffix);
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return (str_len >= suffix_len) &&
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(0 == strcmp(str + (str_len - suffix_len), suffix));
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}
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// Original string replacement function was found here:
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// https://stackoverflow.com/questions/779875/what-is-the-function-to-replace-string-in-c/779960#779960
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//
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// You must free the result if result is non-NULL.
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char *str_replace(char const *orig, char const *rep, char const *with)
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{
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char *result; // the return string
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char const *ins; // the next insert point
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char *tmp; // varies
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int len_rep; // length of rep (the string to remove)
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int len_with; // length of with (the string to replace rep with)
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int len_front; // distance between rep and end of last rep
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int count; // number of replacements
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// sanity checks and initialization
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if (!orig || !rep)
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return NULL;
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len_rep = strlen(rep);
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if (len_rep == 0)
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return NULL; // empty rep causes infinite loop during count
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if (!with)
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with = "";
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len_with = strlen(with);
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// count the number of replacements needed
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ins = orig;
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for (count = 0; (tmp = strstr(ins, rep)); ++count) {
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ins = tmp + len_rep;
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}
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tmp = result = malloc(strlen(orig) + (len_with - len_rep) * (size_t)count + 1);
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if (!result) {
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WARN_MALLOC("str_replace()");
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return NULL; // NOTE: returns NULL on alloc failure.
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}
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// first time through the loop, all the variables are set correctly
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// from here on,
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// tmp points to the end of the result string
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// ins points to the next occurrence of rep in orig
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// orig points to the remainder of orig after "end of rep"
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while (count--) {
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ins = strstr(orig, rep);
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len_front = ins - orig;
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tmp = strncpy(tmp, orig, len_front) + len_front;
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tmp = strcpy(tmp, with) + len_with; // NOLINT
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orig += len_front + len_rep; // move to next "end of rep"
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}
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strcpy(tmp, orig); // NOLINT
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return result;
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}
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// Make a more readable string for a frequency.
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char const *nice_freq (double freq)
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{
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static char buf[30];
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if (freq >= 1E9)
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snprintf (buf, sizeof(buf), "%.3fGHz", freq/1E9);
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else if (freq >= 1E6)
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snprintf (buf, sizeof(buf), "%.3fMHz", freq/1E6);
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else if (freq >= 1E3)
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snprintf (buf, sizeof(buf), "%.3fkHz", freq/1E3);
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else
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snprintf (buf, sizeof(buf), "%f", freq);
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return (buf);
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}
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