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// Copyright 2009 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#if !(defined(_WIN32) || defined(__CYGWIN__))
#error This file should only be compiled on Windows.
#endif
// Implement strptime under windows
#include "strptime.h"
#include <time.h>
#include <ctype.h>
#include <string.h>
#if defined(__CYGWIN__)
// Define strnicmp for Cygwin.
#ifndef strcmpi
#define strcmpi strcasecmp
#endif
#ifndef stricmp
#define stricmp strcasecmp
#endif
#ifndef strncmpi
#define strncmpi strncasecmp
#endif
#ifndef strnicmp
#define strnicmp strncasecmp
#endif
#endif
static const char* kWeekFull[] = {
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday"
};
static const char* kWeekAbbr[] = {
"Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat"
};
static const char* kMonthFull[] = {
"January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November", "December"
};
static const char* kMonthAbbr[] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const char* _parse_num(const char* s, int low, int high, int* value) {
const char* p = s;
for (*value = 0;
*p != NULL && isdigit(static_cast<unsigned char>(*p));
++p) {
*value = (*value) * 10 + static_cast<int>(*p) - static_cast<int>('0');
}
if (p == s || *value < low || *value > high) return NULL;
return p;
}
static char* _strptime(const char *s, const char *format, struct tm *tm) {
while (*format != NULL && *s != NULL) {
if (*format != '%') {
if (*s != *format) return NULL;
++format;
++s;
continue;
}
++format;
int len = 0;
switch (*format) {
// weekday name.
case 'a':
case 'A':
tm->tm_wday = -1;
for (int i = 0; i < 7; ++i) {
len = static_cast<int>(strlen(kWeekFull[i]));
if (strnicmp(kWeekFull[i], s, len) == 0) {
tm->tm_wday = i;
break;
}
len = static_cast<int>(strlen(kWeekAbbr[i]));
if (strnicmp(kWeekAbbr[i], s, len) == 0) {
tm->tm_wday = i;
break;
}
}
if (tm->tm_wday == -1) return NULL;
s += len;
break;
// month name.
case 'b':
case 'B':
case 'h':
tm->tm_mon = -1;
for (int i = 0; i < 12; ++i) {
len = static_cast<int>(strlen(kMonthFull[i]));
if (strnicmp(kMonthFull[i], s, len) == 0) {
tm->tm_mon = i;
break;
}
len = static_cast<int>(strlen(kMonthAbbr[i]));
if (strnicmp(kMonthAbbr[i], s, len) == 0) {
tm->tm_mon = i;
break;
}
}
if (tm->tm_mon == -1) return NULL;
s += len;
break;
// month [1, 12].
case 'm':
s = _parse_num(s, 1, 12, &tm->tm_mon);
if (s == NULL) return NULL;
--tm->tm_mon;
break;
// day [1, 31].
case 'd':
case 'e':
s = _parse_num(s, 1, 31, &tm->tm_mday);
if (s == NULL) return NULL;
break;
// hour [0, 23].
case 'H':
s = _parse_num(s, 0, 23, &tm->tm_hour);
if (s == NULL) return NULL;
break;
// minute [0, 59]
case 'M':
s = _parse_num(s, 0, 59, &tm->tm_min);
if (s == NULL) return NULL;
break;
// seconds [0, 60]. 60 is for leap year.
case 'S':
s = _parse_num(s, 0, 60, &tm->tm_sec);
if (s == NULL) return NULL;
break;
// year [1900, 9999].
case 'Y':
s = _parse_num(s, 1900, 9999, &tm->tm_year);
if (s == NULL) return NULL;
tm->tm_year -= 1900;
break;
// year [0, 99].
case 'y':
s = _parse_num(s, 0, 99, &tm->tm_year);
if (s == NULL) return NULL;
if (tm->tm_year <= 68) {
tm->tm_year += 100;
}
break;
// arbitrary whitespace.
case 't':
case 'n':
while (isspace(static_cast<unsigned char>(*s))) ++s;
break;
// '%'.
case '%':
if (*s != '%') return NULL;
++s;
break;
// All the other format are not supported.
default:
return NULL;
}
++format;
}
if (*format != NULL) {
return NULL;
} else {
return const_cast<char*>(s);
}
}
char* strptime(const char *buf, const char *fmt, struct tm *tm) {
return _strptime(buf, fmt, tm);
}
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