find-lang.sh


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#include <sys/types.h>
#include <time.h>

static char *sweekdays[]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};
static char *weekdays[]={"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"};
static char *smonths[]={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
static char *months[]={"January","February","March","April","May","June","July","August","September","October","November","December"};
static char *ampm[]={"am","pm","AM","PM"};

static int i2a(char* dest,unsigned int x) {
  register unsigned int tmp=x;
  register int len=0;
  *dest++=tmp/10+'0'; tmp=tmp%10; ++len;
  *dest++=tmp+'0';
  return 2;
}

static int i2as(char* dest,unsigned int x) {
  int len=i2a(dest,x);
  if (*dest=='0') *dest=' ';
  return len;
}

size_t strftime(char *s, size_t max, const char *format, const struct tm *tm) {
  char *t=s;
  const char *src;
  char buf[5];
  while (*format) {
    switch (*format) {
    case 0: break;
    case '%':
      switch (*++format) {
      case '%': *t='%'; ++t; break;
      case 'a': src=sweekdays[tm->tm_wday]; goto append;
      case 'A': src=weekdays[tm->tm_wday]; goto append;
      case 'h':
      case 'b': src=smonths[tm->tm_mon]; goto append;
      case 'B': src=months[tm->tm_mon]; goto append;
      case 'c': t+=strftime(t,max-(t-s),"%b %a %d %k:%M:%S %Z %Y",tm); break;
      case 'C': buf[i2a(buf,(tm->tm_year+1900)/100)]=0; src=buf; goto append;
      case 'd': buf[i2a(buf,tm->tm_mday)]=0; src=buf; goto append;
      case 'e': buf[i2as(buf,tm->tm_mday)]=0; src=buf; goto append;
      case 'H': buf[i2a(buf,tm->tm_hour)]=0; src=buf; goto append;
      case 'I': buf[i2a(buf,tm->tm_hour%12)]=0; src=buf; goto append;
      case 'j': buf[i2a(buf,tm->tm_yday)]=0; src=buf; goto append;
      case 'k': buf[i2as(buf,tm->tm_hour)]=0; src=buf; goto append;
      case 'l': buf[i2as(buf,tm->tm_hour%12)]=0; src=buf; goto append;
      case 'm': buf[i2a(buf,tm->tm_mon+1)]=0; src=buf; goto append;
      case 'M': buf[i2a(buf,tm->tm_min)]=0; src=buf; goto append;
      case 'n': *t='\n'; break;
      case 'p': src=ampm[tm->tm_hour>11?3:2]; goto append;
      case 'P': src=ampm[tm->tm_hour>11?1:0]; goto append;
      case 'r': t+=strftime(t,max-(t-s),"%I:%M:%S %p",tm); break;
      case 'R': t+=strftime(t,max-(t-s),"%H:%M",tm); break;
      case 'S': buf[i2a(buf,tm->tm_sec)]=0; src=buf; goto append;
      case 't': *t='\t'; break;
      case 'T': t+=strftime(t,max-(t-s),"%H:%M:%S",tm); break;
      case 'u': buf[i2a(buf,tm->tm_wday?tm->tm_wday:7)]=0; src=buf; goto append;
      case 'w': buf[i2a(buf,tm->tm_wday)]=0; src=buf; goto append;
      case 'x': t+=strftime(t,max-(t-s),"%b %a %d",tm); break;
      case 'X': t+=strftime(t,max-(t-s),"%k:%M:%S",tm); break;
      case 'y': buf[i2a(buf,tm->tm_year%100)]=0; src=buf; goto append;