Swatch Internet Time patched into strftime

README.md

Usage

Compile beat.so as above, then add it to any program with LD_PRELOAD=<absolute-path-to-so-file>, like:

LD_PRELOAD=/home/insom/beat.so irc

(And in irssi just issue /SET TIMESTAMP_FORMAT {BEAT} to switch your status bar and timestamp entries to the One True Internet Time).

beat.c

#define _GNU_SOURCE
#include <sys/types.h>
#include <dlfcn.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <stdio.h>

static size_t (*real_strftime)(char *s, size_t max, const char *format, const struct tm *tm) = NULL;

size_t strftime(char *s, size_t max, const char *format, const struct tm *tm) {
    char result[5] = {0};
    real_strftime = dlsym(RTLD_NEXT, "strftime");

    time_t t = mktime((struct tm *)tm);
    t = t + 3600; // Add an hour to make into BMT

    struct tm *bt = gmtime(&t);
    double sex = (bt->tm_hour * 3600) + (bt->tm_min * 60) + bt->tm_sec;
    int beats = (int)(10 * (sex / 864)) % 1000;
    sprintf(result, "@%.3d", beats);

    char *new_format = strdup(format);
    char *dest = strstr(new_format, "BEAT");
    if(dest != NULL) {
        strncpy(dest, result, 4);
    }
    size_t rv = real_strftime(s, max, new_format, tm);
    free(new_format);
    return rv;
}

compile.sh

#!/bin/sh
gcc -shared -fPIC beat.c -ldl -o beat.so