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42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include "fmt.h"
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#include "byte.h"
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#include <time.h>
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static unsigned int fmt_2digits(char* dest,int i) {
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dest[0]=(char)((i/10)+'0');
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dest[1]=(char)((i%10)+'0');
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return 2;
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}
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size_t fmt_httpdate(char* dest,time_t t) {
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static const char days[] = "SunMonTueWedThuFriSat";
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static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
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#ifdef _WIN32
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struct tm tmp;
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struct tm* x=&tmp;
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gmtime_s(&tmp,&t); /* can't recover from when this fails */
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#else
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struct tm* x=gmtime(&t);
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#endif
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size_t i;
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if (dest==0) return 29;
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/* "Sun, 06 Nov 1994 08:49:37 GMT" */
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byte_copy(dest,3,days+3*x->tm_wday); i=3;
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i+=fmt_str(dest+i,", ");
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i+=fmt_2digits(dest+i,x->tm_mday);
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i+=fmt_str(dest+i," ");
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byte_copy(dest+i,3,months+3*x->tm_mon); i+=3;
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i+=fmt_str(dest+i," ");
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i+=fmt_2digits(dest+i,(x->tm_year+1900)/100);
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i+=fmt_2digits(dest+i,(x->tm_year+1900)%100);
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i+=fmt_str(dest+i," ");
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i+=fmt_2digits(dest+i,x->tm_hour);
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i+=fmt_str(dest+i,":");
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i+=fmt_2digits(dest+i,x->tm_min);
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i+=fmt_str(dest+i,":");
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i+=fmt_2digits(dest+i,x->tm_sec);
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i+=fmt_str(dest+i," GMT");
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return i;
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}
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