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reactos/sdk/lib/crt/time/strftime.c

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/*
* COPYRIGHT: LGPL, See LGPL.txt in the top level directory
* PROJECT: ReactOS CRT library
* FILE: lib/sdk/crt/time/strftime.c
* PURPOSE:
* PROGRAMER:
*/
#include <precomp.h>
static inline BOOL strftime_date(char *str, size_t *pos, size_t max,
BOOL alternate, const struct tm *mstm, MSVCRT___lc_time_data *time_data)
{
char *format;
SYSTEMTIME st;
size_t ret;
st.wYear = mstm->tm_year + 1900;
st.wMonth = mstm->tm_mon + 1;
st.wDayOfWeek = mstm->tm_wday;
st.wDay = mstm->tm_mday;
st.wHour = mstm->tm_hour;
st.wMinute = mstm->tm_min;
st.wSecond = mstm->tm_sec;
st.wMilliseconds = 0;
format = alternate ? time_data->str.names.date : time_data->str.names.short_date;
ret = GetDateFormatA(time_data->lcid, 0, &st, format, NULL, 0);
if(ret && ret<max-*pos)
ret = GetDateFormatA(time_data->lcid, 0, &st, format, str+*pos, max-*pos);
if(!ret) {
*str = 0;
*_errno() = EINVAL;
return FALSE;
}else if(ret > max-*pos) {
*str = 0;
*_errno() = ERANGE;
return FALSE;
}
*pos += ret-1;
return TRUE;
}
static inline BOOL strftime_time(char *str, size_t *pos, size_t max,
const struct tm *mstm, MSVCRT___lc_time_data *time_data)
{
SYSTEMTIME st;
size_t ret;
st.wYear = mstm->tm_year + 1900;
st.wMonth = mstm->tm_mon + 1;
st.wDayOfWeek = mstm->tm_wday;
st.wDay = mstm->tm_mday;
st.wHour = mstm->tm_hour;
st.wMinute = mstm->tm_min;
st.wSecond = mstm->tm_sec;
st.wMilliseconds = 0;
ret = GetTimeFormatA(time_data->lcid, 0, &st, time_data->str.names.time, NULL, 0);
if(ret && ret<max-*pos)
ret = GetTimeFormatA(time_data->lcid, 0, &st, time_data->str.names.time,
str+*pos, max-*pos);
if(!ret) {
*str = 0;
*_errno() = EINVAL;
return FALSE;
}else if(ret > max-*pos) {
*str = 0;
*_errno() = ERANGE;
return FALSE;
}
*pos += ret-1;
return TRUE;
}
static inline BOOL strftime_str(char *str, size_t *pos, size_t max, char *src)
{
size_t len = strlen(src);
if(len > max-*pos) {
*str = 0;
*_errno() = ERANGE;
return FALSE;
}
memcpy(str+*pos, src, len);
*pos += len;
return TRUE;
}
static inline BOOL strftime_int(char *str, size_t *pos, size_t max,
int src, int prec, int l, int h)
{
size_t len;
if(src<l || src>h) {
*str = 0;
*_errno() = EINVAL;
return FALSE;
}
len = _snprintf(str+*pos, max-*pos, "%0*d", prec, src);
if(len == -1) {
*str = 0;
*_errno() = ERANGE;
return FALSE;
}
*pos += len;
return TRUE;
}
/*********************************************************************
* _Strftime (MSVCRT.@)
*/
size_t CDECL _Strftime(char *str, size_t max, const char *format,
const struct tm *mstm, MSVCRT___lc_time_data *time_data)
{
size_t ret, tmp;
BOOL alternate;
TRACE("(%p %ld %s %p %p)\n", str, max, format, mstm, time_data);
if(!str || !format) {
if(str && max)
*str = 0;
*_errno() = EINVAL;
return 0;
}
if(!time_data)
time_data = get_locinfo()->lc_time_curr;
for(ret=0; *format && ret<max; format++) {
if(*format != '%') {
str[ret++] = *format;
continue;
}
format++;
if(*format == '#') {
alternate = TRUE;
format++;
}else {
alternate = FALSE;
}
if(!mstm)
goto einval_error;
switch(*format) {
case 'c':
if(!strftime_date(str, &ret, max, alternate, mstm, time_data))
return 0;
if(ret < max)
str[ret++] = ' ';
if(!strftime_time(str, &ret, max, mstm, time_data))
return 0;
break;
case 'x':
if(!strftime_date(str, &ret, max, alternate, mstm, time_data))
return 0;
break;
case 'X':
if(!strftime_time(str, &ret, max, mstm, time_data))
return 0;
break;
case 'a':
if(mstm->tm_wday<0 || mstm->tm_wday>6)
goto einval_error;
if(!strftime_str(str, &ret, max, time_data->str.names.short_wday[mstm->tm_wday]))
return 0;
break;
case 'A':
if(mstm->tm_wday<0 || mstm->tm_wday>6)
goto einval_error;
if(!strftime_str(str, &ret, max, time_data->str.names.wday[mstm->tm_wday]))
return 0;
break;
case 'b':
if(mstm->tm_mon<0 || mstm->tm_mon>11)
goto einval_error;
if(!strftime_str(str, &ret, max, time_data->str.names.short_mon[mstm->tm_mon]))
return 0;
break;
case 'B':
if(mstm->tm_mon<0 || mstm->tm_mon>11)
goto einval_error;
if(!strftime_str(str, &ret, max, time_data->str.names.mon[mstm->tm_mon]))
return 0;
break;
case 'd':
if(!strftime_int(str, &ret, max, mstm->tm_mday, alternate ? 0 : 2, 0, 31))
return 0;
break;
case 'H':
if(!strftime_int(str, &ret, max, mstm->tm_hour, alternate ? 0 : 2, 0, 23))
return 0;
break;
case 'I':
tmp = mstm->tm_hour;
if(tmp > 12)
tmp -= 12;
else if(!tmp)
tmp = 12;
if(!strftime_int(str, &ret, max, tmp, alternate ? 0 : 2, 1, 12))
return 0;
break;
case 'j':
if(!strftime_int(str, &ret, max, mstm->tm_yday+1, alternate ? 0 : 3, 1, 366))
return 0;
break;
case 'm':
if(!strftime_int(str, &ret, max, mstm->tm_mon+1, alternate ? 0 : 2, 1, 12))
return 0;
break;
case 'M':
if(!strftime_int(str, &ret, max, mstm->tm_min, alternate ? 0 : 2, 0, 59))
return 0;
break;
case 'p':
if(mstm->tm_hour<0 || mstm->tm_hour>23)
goto einval_error;
if(!strftime_str(str, &ret, max, mstm->tm_hour<12 ?
time_data->str.names.am : time_data->str.names.pm))
return 0;
break;
case 'S':
if(!strftime_int(str, &ret, max, mstm->tm_sec, alternate ? 0 : 2, 0, 59))
return 0;
break;
case 'w':
if(!strftime_int(str, &ret, max, mstm->tm_wday, 0, 0, 6))
return 0;
break;
case 'y':
if(!strftime_int(str, &ret, max, mstm->tm_year%100, alternate ? 0 : 2, 0, 99))
return 0;
break;
case 'Y':
tmp = 1900+mstm->tm_year;
if(!strftime_int(str, &ret, max, tmp, alternate ? 0 : 4, 0, 9999))
return 0;
break;
case 'z':
case 'Z':
_tzset();
if(_get_tzname(&tmp, str+ret, max-ret, mstm->tm_isdst ? 1 : 0))
return 0;
ret += tmp;
break;
case 'U':
case 'W':
if(mstm->tm_wday<0 || mstm->tm_wday>6 || mstm->tm_yday<0 || mstm->tm_yday>365)
goto einval_error;
if(*format == 'U')
tmp = mstm->tm_wday;
else if(!mstm->tm_wday)
tmp = 6;
else
tmp = mstm->tm_wday-1;
tmp = mstm->tm_yday/7 + (tmp <= ((unsigned)mstm->tm_yday%7));
if(!strftime_int(str, &ret, max, tmp, alternate ? 0 : 2, 0, 53))
return 0;
break;
case '%':
str[ret++] = '%';
break;
default:
WARN("unknown format %c\n", *format);
goto einval_error;
}
}
if(ret == max) {
if(max)
*str = 0;
*_errno() = ERANGE;
return 0;
}
str[ret] = 0;
return ret;
einval_error:
*str = 0;
*_errno() = EINVAL;
return 0;
}
/*********************************************************************
* strftime (MSVCRT.@)
*/
size_t CDECL strftime( char *str, size_t max, const char *format,
const struct tm *mstm )
{
return _Strftime(str, max, format, mstm, NULL);
}
/*********************************************************************
* wcsftime (MSVCRT.@)
*/
size_t CDECL wcsftime( wchar_t *str, size_t max,
const wchar_t *format, const struct tm *mstm )
{
char *s, *fmt;
size_t len;
TRACE("%p %ld %s %p\n", str, max, debugstr_w(format), mstm );
len = WideCharToMultiByte( CP_ACP, 0, format, -1, NULL, 0, NULL, NULL );
if (!(fmt = malloc( len ))) return 0;
WideCharToMultiByte( CP_ACP, 0, format, -1, fmt, len, NULL, NULL );
if ((s = malloc( max*4 )))
{
if (!strftime( s, max*4, fmt, mstm )) s[0] = 0;
len = MultiByteToWideChar( CP_ACP, 0, s, -1, str, max );
if (len) len--;
free( s );
}
else len = 0;
free( fmt );
return len;
}
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