1 /*
2
3 Functions related to time:
4
5 1) rfc (string) time to unix-time
6 2) unix-time to rfc (string) time
7 3) current time to rfc (string) time for the "Date:" header
8
9 */
10
11 /****************************************************************
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 ****************************************************************/
27
28 #include <linux/time.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/ctype.h>
32
33
34 #include "times.h"
35 #include "prototypes.h"
36 static char *dayName[7] = {
37 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
38 };
39
40 static char *monthName[12] = {
41 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
42 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
43 };
44
45
46 char CurrentTime[64];
47 int CurrentTime_i;
48
49
50 static char itoa_h[60]={'0','0','0','0','0','0','0','0','0','0',
51 '1','1','1','1','1','1','1','1','1','1',
52 '2','2','2','2','2','2','2','2','2','2',
53 '3','3','3','3','3','3','3','3','3','3',
54 '4','4','4','4','4','4','4','4','4','4',
55 '5','5','5','5','5','5','5','5','5','5'};
56
57 static char itoa_l[60]={'0','1','2','3','4','5','6','7','8','9',
58 '0','1','2','3','4','5','6','7','8','9',
59 '0','1','2','3','4','5','6','7','8','9',
60 '0','1','2','3','4','5','6','7','8','9',
61 '0','1','2','3','4','5','6','7','8','9',
62 '0','1','2','3','4','5','6','7','8','9'};
time_Unix2RFC(const time_t Zulu,char * Buffer)63 void time_Unix2RFC(const time_t Zulu,char *Buffer)
64 {
65 int Y=0,M=0,D=0;
66 int H=0,Min=0,S=0,WD=0;
67 int I,I2;
68 time_t rest;
69
70
71
72 I=0;
73 while (I<KHTTPD_NUMYEARS)
74 {
75 if (TimeDays[I][0]>Zulu)
76 break;
77 I++;
78 }
79
80 Y=--I;
81 if (I<0)
82 {
83 Y=0;
84 goto BuildYear;
85 }
86 I2=0;
87 while (I2<=12)
88 {
89 if (TimeDays[I][I2]>Zulu)
90 break;
91 I2++;
92 }
93
94 M=I2-1;
95
96 rest=Zulu - TimeDays[Y][M];
97 WD=WeekDays[Y][M];
98 D=rest/86400;
99 rest=rest%86400;
100 WD+=D;
101 WD=WD%7;
102 H=rest/3600;
103 rest=rest%3600;
104 Min=rest/60;
105 rest=rest%60;
106 S=rest;
107
108 BuildYear:
109 Y+=KHTTPD_YEAROFFSET;
110
111
112 /* Format: Day, 01 Mon 1999 01:01:01 GMT */
113
114 /*
115 We want to do
116
117 sprintf( Buffer, "%s, %02i %s %04i %02i:%02i:%02i GMT",
118 dayName[ WD ], D+1, monthName[ M ], Y,
119 H, Min, S
120 );
121
122 but this is very expensive. Since the string is fixed length,
123 it is filled manually.
124 */
125 Buffer[0]=dayName[WD][0];
126 Buffer[1]=dayName[WD][1];
127 Buffer[2]=dayName[WD][2];
128 Buffer[3]=',';
129 Buffer[4]=' ';
130 Buffer[5]=itoa_h[D+1];
131 Buffer[6]=itoa_l[D+1];
132 Buffer[7]=' ';
133 Buffer[8]=monthName[M][0];
134 Buffer[9]=monthName[M][1];
135 Buffer[10]=monthName[M][2];
136 Buffer[11]=' ';
137 Buffer[12]=itoa_l[Y/1000];
138 Buffer[13]=itoa_l[(Y/100)%10];
139 Buffer[14]=itoa_l[(Y/10)%10];
140 Buffer[15]=itoa_l[Y%10];
141 Buffer[16]=' ';
142 Buffer[17]=itoa_h[H];
143 Buffer[18]=itoa_l[H];
144 Buffer[19]=':';
145 Buffer[20]=itoa_h[Min];
146 Buffer[21]=itoa_l[Min];
147 Buffer[22]=':';
148 Buffer[23]=itoa_h[S];
149 Buffer[24]=itoa_l[S];
150 Buffer[25]=' ';
151 Buffer[26]='G';
152 Buffer[27]='M';
153 Buffer[28]='T';
154 Buffer[29]=0;
155
156
157
158
159 }
160
UpdateCurrentDate(void)161 void UpdateCurrentDate(void)
162 {
163 struct timeval tv;
164
165 do_gettimeofday(&tv);
166 if (CurrentTime_i!=tv.tv_sec)
167 time_Unix2RFC(tv.tv_sec,CurrentTime);
168
169 CurrentTime_i = tv.tv_sec;
170 }
171
172 static int MonthHash[32] = {0,0,7,0,0,0,0,0,0,0,0,3,0,0,0,2,6,0,5,0,9,8,4,0,0,11,1,10,0,0,0,0};
173
174 #define is_digit(c) ((c) >= '0' && (c) <= '9')
175
skip_atoi(char ** s)176 __inline static int skip_atoi(char **s)
177 {
178 int i=0;
179
180 while (is_digit(**s))
181 i = i*10 + *((*s)++) - '0';
182 return i;
183 }
184
mimeTime_to_UnixTime(char * Q)185 time_t mimeTime_to_UnixTime(char *Q)
186 {
187 int Y,M,D,H,Min,S;
188 unsigned int Hash;
189 time_t Temp;
190 char *s,**s2;
191
192 s=Q;
193 s2=&s;
194
195 if (strlen(s)<30) return 0;
196 if (s[3]!=',') return 0;
197 if (s[19]!=':') return 0;
198
199 s+=5; /* Skip day of week */
200 D = skip_atoi(s2); /* Day of month */
201 s++;
202 Hash = (unsigned char)s[0]+(unsigned char)s[2];
203 Hash = (Hash<<1) + (unsigned char)s[1];
204 Hash = (Hash&63)>>1;
205 M = MonthHash[Hash];
206 s+=4;
207 Y = skip_atoi(s2); /* Year */
208 s++;
209 H = skip_atoi(s2); /* Hour */
210 s++;
211 Min = skip_atoi(s2); /* Minutes */
212 s++;
213 S = skip_atoi(s2); /* Seconds */
214 s++;
215 if ((s[0]!='G')||(s[1]!='M')||(s[2]!='T'))
216 {
217 return 0; /* No GMT */
218 }
219
220 if (Y<KHTTPD_YEAROFFSET) Y = KHTTPD_YEAROFFSET;
221 if (Y>KHTTPD_YEAROFFSET+9) Y = KHTTPD_YEAROFFSET+9;
222
223 Temp = TimeDays[Y-KHTTPD_YEAROFFSET][M];
224 Temp += D*86400+H*3600+Min*60+S;
225
226 return Temp;
227 }
228