310 lines
7.5 KiB
C
310 lines
7.5 KiB
C
/* Convert a string representation of time to a time value.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <limits.h>
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <alloca.h>
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#define TM_YEAR_BASE 1900
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/* Prototypes for local functions. */
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static int first_wday (int year, int mon, int wday);
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static int check_mday (int year, int mon, int mday);
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/* Set to one of the following values to indicate an error.
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1 the DATEMSK environment variable is null or undefined,
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2 the template file cannot be opened for reading,
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3 failed to get file status information,
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4 the template file is not a regular file,
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5 an error is encountered while reading the template file,
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6 memory allication failed (not enough memory available),
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7 there is no line in the template that matches the input,
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8 invalid input specification Example: February 31 or a time is
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specified that can not be represented in a time_t (representing
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the time in seconds since 00:00:00 UTC, January 1, 1970) */
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int getdate_err;
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/* Returns the first weekday WDAY of month MON in the year YEAR. */
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static int
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first_wday (int year, int mon, int wday)
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{
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struct tm tm;
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if (wday == INT_MIN)
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return 1;
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memset (&tm, 0, sizeof (struct tm));
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tm.tm_year = year;
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tm.tm_mon = mon;
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tm.tm_mday = 1;
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mktime (&tm);
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return (1 + (wday - tm.tm_wday + 7) % 7);
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}
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/* Returns 1 if MDAY is a valid day of the month in month MON of year
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YEAR, and 0 if it is not. */
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static int
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check_mday (int year, int mon, int mday)
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{
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switch (mon)
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{
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case 0:
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case 2:
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case 4:
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case 6:
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case 7:
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case 9:
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case 11:
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if (mday >= 1 && mday <= 31)
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return 1;
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break;
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case 3:
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case 5:
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case 8:
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case 10:
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if (mday >= 1 && mday <= 30)
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return 1;
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break;
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case 1:
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if (mday >= 1 && mday <= (__isleap (year) ? 29 : 28))
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return 1;
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break;
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}
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return 0;
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}
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int
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__getdate_r (const char *string, struct tm *tp)
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{
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FILE *fp;
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char *line;
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size_t len;
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char *datemsk;
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char *result = NULL;
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__time64_t timer;
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struct tm tm;
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struct __stat64_t64 st;
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bool mday_ok = false;
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datemsk = getenv ("DATEMSK");
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if (datemsk == NULL || *datemsk == '\0')
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return 1;
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if (__stat64_time64 (datemsk, &st) < 0)
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return 3;
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if (!S_ISREG (st.st_mode))
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return 4;
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if (__access (datemsk, R_OK) < 0)
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return 2;
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/* Open the template file. */
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fp = fopen (datemsk, "rce");
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if (fp == NULL)
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return 2;
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/* No threads reading this stream. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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/* Skip leading whitespace. */
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while (isspace (*string))
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string++;
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size_t inlen, oldlen;
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oldlen = inlen = strlen (string);
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/* Skip trailing whitespace. */
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while (inlen > 0 && isspace (string[inlen - 1]))
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inlen--;
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char *instr = NULL;
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if (inlen < oldlen)
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{
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bool using_malloc = false;
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if (__libc_use_alloca (inlen + 1))
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instr = alloca (inlen + 1);
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else
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{
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instr = malloc (inlen + 1);
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if (instr == NULL)
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{
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fclose (fp);
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return 6;
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}
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using_malloc = true;
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}
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memcpy (instr, string, inlen);
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instr[inlen] = '\0';
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string = instr;
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if (!using_malloc)
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instr = NULL;
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}
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line = NULL;
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len = 0;
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do
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{
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ssize_t n;
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n = __getline (&line, &len, fp);
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if (n < 0)
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break;
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if (line[n - 1] == '\n')
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line[n - 1] = '\0';
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/* Do the conversion. */
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tp->tm_year = tp->tm_mon = tp->tm_mday = tp->tm_wday = INT_MIN;
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tp->tm_hour = tp->tm_sec = tp->tm_min = INT_MIN;
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tp->tm_isdst = -1;
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tp->tm_gmtoff = 0;
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tp->tm_zone = NULL;
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result = strptime (string, line, tp);
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if (result && *result == '\0')
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break;
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}
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while (!__feof_unlocked (fp));
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free (instr);
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/* Free the buffer. */
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free (line);
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/* Check for errors. */
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if (__ferror_unlocked (fp))
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{
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fclose (fp);
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return 5;
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}
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/* Close template file. */
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fclose (fp);
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if (result == NULL || *result != '\0')
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return 7;
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/* Get current time. */
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timer = time64_now ();
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__localtime64_r (&timer, &tm);
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/* If only the weekday is given, today is assumed if the given day
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is equal to the current day and next week if it is less. */
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if (tp->tm_wday >= 0 && tp->tm_wday <= 6 && tp->tm_year == INT_MIN
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&& tp->tm_mon == INT_MIN && tp->tm_mday == INT_MIN)
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{
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tp->tm_year = tm.tm_year;
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tp->tm_mon = tm.tm_mon;
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tp->tm_mday = tm.tm_mday + (tp->tm_wday - tm.tm_wday + 7) % 7;
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mday_ok = true;
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}
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/* If only the month is given, the current month is assumed if the
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given month is equal to the current month and next year if it is
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less and no year is given (the first day of month is assumed if
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no day is given. */
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if (tp->tm_mon >= 0 && tp->tm_mon <= 11 && tp->tm_mday == INT_MIN)
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{
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if (tp->tm_year == INT_MIN)
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tp->tm_year = tm.tm_year + (((tp->tm_mon - tm.tm_mon) < 0) ? 1 : 0);
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tp->tm_mday = first_wday (tp->tm_year, tp->tm_mon, tp->tm_wday);
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mday_ok = true;
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}
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/* If no hour, minute and second are given the current hour, minute
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and second are assumed. */
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if (tp->tm_hour == INT_MIN && tp->tm_min == INT_MIN && tp->tm_sec == INT_MIN)
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{
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tp->tm_hour = tm.tm_hour;
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tp->tm_min = tm.tm_min;
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tp->tm_sec = tm.tm_sec;
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}
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/* Fill in the gaps. */
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if (tp->tm_hour == INT_MIN)
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tp->tm_hour = 0;
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if (tp->tm_min == INT_MIN)
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tp->tm_min = 0;
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if (tp->tm_sec == INT_MIN)
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tp->tm_sec = 0;
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/* If no date is given, today is assumed if the given hour is
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greater than the current hour and tomorrow is assumed if
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it is less. */
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if (tp->tm_hour >= 0 && tp->tm_hour <= 23
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&& tp->tm_mon == INT_MIN
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&& tp->tm_mday == INT_MIN && tp->tm_wday == INT_MIN)
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{
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tp->tm_mon = tm.tm_mon;
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tp->tm_mday = tm.tm_mday + ((tp->tm_hour - tm.tm_hour) < 0 ? 1 : 0);
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mday_ok = 1;
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}
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/* More fillers. */
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if (tp->tm_year == INT_MIN)
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tp->tm_year = tm.tm_year;
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if (tp->tm_mon == INT_MIN)
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tp->tm_mon = tm.tm_mon;
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/* Check if the day of month is within range, and if the time can be
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represented in a time_t. We make use of the fact that the mktime
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call normalizes the struct tm. */
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if ((!mday_ok && !check_mday (TM_YEAR_BASE + tp->tm_year, tp->tm_mon,
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tp->tm_mday))
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|| __mktime64 (tp) == (time_t) -1)
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return 8;
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return 0;
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}
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weak_alias (__getdate_r, getdate_r)
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libc_hidden_def (__getdate_r)
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struct tm *
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getdate (const char *string)
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{
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/* Buffer returned by getdate. */
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static struct tm tmbuf;
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int errval = __getdate_r (string, &tmbuf);
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if (errval != 0)
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{
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getdate_err = errval;
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return NULL;
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}
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return &tmbuf;
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}
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