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- /* Parse dates for touch.
- Copyright (C) 1987, 1989, 1990, Free Software Foundation Inc.
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Written by Jim Kingdon and David MacKenzie. */
-
- /* MS-DOS port (c) 1990 by Thorsten Ohl, ohl@gnu.ai.mit.edu
- This port is also distributed under the terms of the
- GNU General Public License as published by the
- Free Software Foundation.
-
- Please note that this file is not identical to the
- original GNU release, you should have received this
- code as patch to the official release. */
-
- %token digit
-
- %{
- #ifdef MSDOS
- static char RCS_Id[] =
- "$Header: e:/gnu/fileutil/RCS/posixtim.y 1.4.0.2 90/09/19 12:54:32 tho Exp $";
- #endif /* MSDOS */
-
- #include <stdio.h>
- #include <sys/types.h>
- #include <time.h>
-
- /* Used by bison.simple in old (1.08 and older) versions of bison. */
- #ifdef __GNUC__
- #define alloca __builtin_alloca
- #else
- #ifdef sparc
- #include <alloca.h>
- #endif
- #endif
-
- #define YYDEBUG 1
-
- static char *curpos;
-
- static struct tm t;
-
- time_t mktime ();
-
- #ifdef MSDOS
- #include <malloc.h>
- static int yyerror (void);
- static int yylex (void);
- #else /* not MSDOS */
- static int yylex ();
- static int yyerror ();
- #endif /* not MSDOS */
-
- #define yyparse posixtime_yyparse
- %}
-
- %%
- date :
- digitpair /* month */
- digitpair /* day */
- digitpair /* hours */
- digitpair /* minutes */
- year
- seconds {
- if ($1 >= 1 && $1 <= 12)
- t.tm_mon = $1 - 1;
- else {
- YYABORT;
- }
- if ($2 >= 1 && $2 <= 31)
- t.tm_mday = $2;
- else {
- YYABORT;
- }
- if ($3 >= 0 && $3 <= 23)
- t.tm_hour = $3;
- else {
- YYABORT;
- }
- if ($4 >= 0 && $4 <= 59)
- t.tm_min = $4;
- else {
- YYABORT;
- }
- }
-
- year : digitpair {
- t.tm_year = $1;
- /* Deduce the century based on the year.
- See POSIX.2 section 4.63.3. */
- if ($1 <= 68)
- t.tm_year += 100;
- }
- | digitpair digitpair {
- t.tm_year = $1 * 100 + $2;
- if (t.tm_year < 1900) {
- YYABORT;
- } else
- t.tm_year -= 1900;
- }
- | /* empty */ {
- time_t now;
- struct tm *tmp;
-
- /* Use current year. */
- time (&now);
- tmp = localtime (&now);
- t.tm_year = tmp->tm_year;
- }
- ;
-
- seconds : /* empty */ {
- t.tm_sec = 0;
- }
- | '.' digitpair {
- if ($2 >= 0 && $2 <= 61)
- t.tm_sec = $2;
- else {
- YYABORT;
- }
- }
- ;
-
- digitpair : digit digit {
- $$ = $1 * 10 + $2;
- }
- ;
- %%
- static int
- yylex ()
- {
- char ch = *curpos++;
-
- if (ch >= '0' && ch <= '9')
- {
- yylval = ch - '0';
- return digit;
- }
- else if (ch == '.' || ch == '\0')
- return ch;
- else
- /* Cause an error. */
- return '?';
- }
-
- static int
- yyerror ()
- {
- return 0;
- }
-
- /* Parse a POSIX-style date and return it, or (time_t)-1 for an error. */
- time_t
- posixtime (s)
- char *s;
- {
- curpos = s;
- /* Let mktime() decide whether it is daylight savings time. */
- t.tm_isdst = -1;
- if (yyparse ())
- return (time_t)-1;
- else
- return mktime (&t);
- }
-