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/*
* blogc: A blog compiler.
* Copyright (C) 2015 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#ifdef HAVE_TIME_H
#include <time.h>
#endif /* HAVE_TIME_H */
#include <string.h>
#include "error.h"
#include <squareball.h>
#include "datetime-parser.h"
typedef enum {
DATETIME_FIRST_YEAR = 1,
DATETIME_SECOND_YEAR,
DATETIME_THIRD_YEAR,
DATETIME_FOURTH_YEAR,
DATETIME_FIRST_HYPHEN,
DATETIME_FIRST_MONTH,
DATETIME_SECOND_MONTH,
DATETIME_SECOND_HYPHEN,
DATETIME_FIRST_DAY,
DATETIME_SECOND_DAY,
DATETIME_SPACE,
DATETIME_FIRST_HOUR,
DATETIME_SECOND_HOUR,
DATETIME_FIRST_COLON,
DATETIME_FIRST_MINUTE,
DATETIME_SECOND_MINUTE,
DATETIME_SECOND_COLON,
DATETIME_FIRST_SECOND,
DATETIME_SECOND_SECOND,
DATETIME_DONE,
} blogc_datetime_state_t;
char*
blogc_convert_datetime(const char *orig, const char *format,
blogc_error_t **err)
{
if (err == NULL || *err != NULL)
return NULL;
#ifndef HAVE_TIME_H
*err = blogc_error_new(BLOGC_WARNING_DATETIME_PARSER,
"Your operating system does not supports the datetime functionalities "
"used by blogc. Sorry.");
return NULL;
#else
struct tm t;
memset(&t, 0, sizeof(struct tm));
t.tm_isdst = -1;
blogc_datetime_state_t state = DATETIME_FIRST_YEAR;
int tmp = 0;
int diff = '0';
for (unsigned int i = 0; orig[i] != '\0'; i++) {
char c = orig[i];
switch (state) {
case DATETIME_FIRST_YEAR:
if (c >= '0' && c <= '9') {
tmp += (c - diff) * 1000;
state = DATETIME_SECOND_YEAR;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of year. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_SECOND_YEAR:
if (c >= '0' && c <= '9') {
tmp += (c - diff) * 100;
state = DATETIME_THIRD_YEAR;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of year. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_THIRD_YEAR:
if (c >= '0' && c <= '9') {
tmp += (c - diff) * 10;
state = DATETIME_FOURTH_YEAR;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid third digit of year. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_FOURTH_YEAR:
if (c >= '0' && c <= '9') {
tmp += c - diff - 1900;
if (tmp < 0) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid year. Found %d, must be >= 1900.",
tmp + 1900);
break;
}
t.tm_year = tmp;
state = DATETIME_FIRST_HYPHEN;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid fourth digit of year. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_FIRST_HYPHEN:
if (c == '-') {
tmp = 0;
state = DATETIME_FIRST_MONTH;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid separator between year and month. "
"Found '%c', must be '-'.", c);
break;
case DATETIME_FIRST_MONTH:
if (c >= '0' && c <= '1') {
tmp += (c - diff) * 10;
state = DATETIME_SECOND_MONTH;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of month. "
"Found '%c', must be integer >= 0 and <= 1.", c);
break;
case DATETIME_SECOND_MONTH:
if (c >= '0' && c <= '9') {
tmp += c - diff - 1;
if (tmp < 0 || tmp > 11) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid month. Found %d, must be >= 1 and <= 12.",
tmp + 1);
break;
}
t.tm_mon = tmp;
state = DATETIME_SECOND_HYPHEN;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of month. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_SECOND_HYPHEN:
if (c == '-') {
tmp = 0;
state = DATETIME_FIRST_DAY;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid separator between month and day. "
"Found '%c', must be '-'.", c);
break;
case DATETIME_FIRST_DAY:
if (c >= '0' && c <= '3') {
tmp += (c - diff) * 10;
state = DATETIME_SECOND_DAY;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of day. "
"Found '%c', must be integer >= 0 and <= 3.", c);
break;
case DATETIME_SECOND_DAY:
if (c >= '0' && c <= '9') {
tmp += c - diff;
if (tmp < 1 || tmp > 31) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid day. Found %d, must be >= 1 and <= 31.",
tmp);
break;
}
t.tm_mday = tmp;
state = DATETIME_SPACE;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of day. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_SPACE:
if (c == ' ') {
tmp = 0;
state = DATETIME_FIRST_HOUR;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid separator between date and time. "
"Found '%c', must be ' ' (empty space).", c);
break;
case DATETIME_FIRST_HOUR:
if (c >= '0' && c <= '2') {
tmp += (c - diff) * 10;
state = DATETIME_SECOND_HOUR;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of hours. "
"Found '%c', must be integer >= 0 and <= 2.", c);
break;
case DATETIME_SECOND_HOUR:
if (c >= '0' && c <= '9') {
tmp += c - diff;
if (tmp < 0 || tmp > 23) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid hours. Found %d, must be >= 0 and <= 23.",
tmp);
break;
}
t.tm_hour = tmp;
state = DATETIME_FIRST_COLON;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of hours. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_FIRST_COLON:
if (c == ':') {
tmp = 0;
state = DATETIME_FIRST_MINUTE;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid separator between hours and minutes. "
"Found '%c', must be ':'.", c);
break;
case DATETIME_FIRST_MINUTE:
if (c >= '0' && c <= '5') {
tmp += (c - diff) * 10;
state = DATETIME_SECOND_MINUTE;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of minutes. "
"Found '%c', must be integer >= 0 and <= 5.", c);
break;
case DATETIME_SECOND_MINUTE:
if (c >= '0' && c <= '9') {
tmp += c - diff;
if (tmp < 0 || tmp > 59) {
// this won't happen because we are restricting the digits
// to 00-59 already, but lets keep the code here for
// reference.
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid minutes. Found %d, must be >= 0 and <= 59.",
tmp);
break;
}
t.tm_min = tmp;
state = DATETIME_SECOND_COLON;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of minutes. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_SECOND_COLON:
if (c == ':') {
tmp = 0;
state = DATETIME_FIRST_SECOND;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid separator between minutes and seconds. "
"Found '%c', must be ':'.", c);
break;
case DATETIME_FIRST_SECOND:
if (c >= '0' && c <= '6') {
tmp += (c - diff) * 10;
state = DATETIME_SECOND_SECOND;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid first digit of seconds. "
"Found '%c', must be integer >= 0 and <= 6.", c);
break;
case DATETIME_SECOND_SECOND:
if (c >= '0' && c <= '9') {
tmp += c - diff;
if (tmp < 0 || tmp > 60) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid seconds. Found %d, must be >= 0 and <= 60.",
tmp);
break;
}
t.tm_sec = tmp;
state = DATETIME_DONE;
break;
}
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid second digit of seconds. "
"Found '%c', must be integer >= 0 and <= 9.", c);
break;
case DATETIME_DONE:
// well, its done ;)
break;
}
if (*err != NULL)
return NULL;
}
if (*err == NULL) {
switch (state) {
case DATETIME_FIRST_YEAR:
case DATETIME_SECOND_YEAR:
case DATETIME_THIRD_YEAR:
case DATETIME_FOURTH_YEAR:
case DATETIME_FIRST_HYPHEN:
case DATETIME_FIRST_MONTH:
case DATETIME_SECOND_MONTH:
case DATETIME_SECOND_HYPHEN:
case DATETIME_FIRST_DAY:
case DATETIME_SECOND_DAY:
case DATETIME_FIRST_HOUR:
case DATETIME_SECOND_HOUR:
case DATETIME_FIRST_MINUTE:
case DATETIME_SECOND_MINUTE:
case DATETIME_FIRST_SECOND:
case DATETIME_SECOND_SECOND:
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Invalid datetime string. "
"Found '%s', formats allowed are: 'yyyy-mm-dd hh:mm:ss', "
"'yyyy-mm-dd hh:ss', 'yyyy-mm-dd hh' and 'yyyy-mm-dd'.",
orig);
return NULL;
case DATETIME_SPACE:
case DATETIME_FIRST_COLON:
case DATETIME_SECOND_COLON:
case DATETIME_DONE:
break; // these states are ok
}
}
mktime(&t);
char buf[1024];
if (0 == strftime(buf, sizeof(buf), format, &t)) {
*err = blogc_error_new_printf(BLOGC_WARNING_DATETIME_PARSER,
"Failed to format DATE variable, FORMAT is too long: %s",
format);
return NULL;
}
return sb_strdup(buf);
#endif
}
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