Tag
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202
/* Parse dates for touch.
Copyright (C) 1989, 1990, 1991 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 2, 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. */
%{
#ifdef HAVE_CONFIG_H
#if defined (CONFIG_BROKETS)
/* We use <config.h> instead of "config.h" so that a compilation
using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
(which it would do because it found this file in $srcdir). */
#include <config.h>
#else
#include "config.h"
#endif
#endif
/* The following block of alloca-related preprocessor directives is here
solely to allow compilation by non GNU-C compilers of the C parser
produced from this file by old versions of bison. Newer versions of
bison include a block similar to this one in bison.simple. */
#ifdef __GNUC__
#define alloca __builtin_alloca
#else
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#else
#ifdef _AIX
#pragma alloca
#else
void *alloca ();
#endif
#endif
#endif
#include <stdio.h>
#include <sys/types.h>
#ifdef TM_IN_SYS_TIME
#include <sys/time.h>
#else
#include <time.h>
#endif
/* Some old versions of bison generate parsers that use bcopy.
That loses on systems that don't provide the function, so we have
to redefine it here. */
#if !defined (HAVE_BCOPY) && defined (HAVE_MEMCPY) && !defined (bcopy)
#define bcopy(from, to, len) memcpy ((to), (from), (len))
#endif
#define YYDEBUG 1
/* Lexical analyzer's current scan position in the input string. */
static char *curpos;
/* The return value. */
static struct tm t;
time_t mktime ();
#define yyparse posixtime_yyparse
static int yylex ();
static int yyerror ();
%}
%token DIGIT
%%
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
return '?'; /* Cause an error. */
}
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);
}
/* Parse a POSIX-style date and return it, or NULL for an error. */
struct tm *
posixtm (s)
char *s;
{
if (posixtime (s) == -1)
return NULL;
return &t;
}