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#include <stdio.h>
#include <string.h>
#include <time.h>
#include "strftime.h"
static const char *monthAbbr[]={
"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"};
size_t strftime(char *s,size_t max, const char *format,
const struct tm *tm) {
size_t i=0,j=0;
while(j<max && format[i]) {
if (format[i]!='%') {
s[j]=format[i];
i++;j++;
} else {
i++;
switch (format[i]) {
case '%': s[j++]='%';break;
case 'm': if ((j+2) >=max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_mon+1);
break;
case 'd': if ((j+2) >=max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_mday);
break;
case 'y': if ((j+2) >=max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_year%100);
break;
case 'Y': if ((j+4) >=max) return 0;
j+=sprintf(s+j,"%d",tm->tm_year+1900);
break;
case 'b': if ((j+3)>=max) return 0;
strcpy(s+j,monthAbbr[tm->tm_mon]);
j+=3;
break;
case 'l': if ((j+2) >= max) return 0;
{ int hour = tm->tm_hour;
if (hour>12) hour -=12;
if (hour == 0) hour = 12;
j+=sprintf(s+j,"%2d",hour);
break;
}
case 'p': if ((j+2) >= max) return 0;
if (tm->tm_hour >11) {
strcpy(s+j,"PM");
} else {
strcpy(s+j,"AM");
}
j+=2;
break;
case 'H': if ((j+2) >= max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_hour);
break;
case 'M':if ((j+2) >= max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_min);
break;
case 'S':if ((j+2) >= max) return 0;
j+=sprintf(s+j,"%02d",tm->tm_sec);
break;
default:
;
}
i++;
}
}
if (j>=max) return 0;
else {
s[j]=0;
return j;
}
}
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