Commit | Line | Data |
---|---|---|
f6227721 | 1 | #ifndef lint |
2fbd0239 | 2 | static char sccsid[] = "@(#)cal.c 4.4 (Berkeley) 87/05/28"; |
f6227721 SL |
3 | #endif |
4 | ||
2fbd0239 SL |
5 | #include <sys/types.h> |
6 | #include <time.h> | |
7 | #include <stdio.h> | |
8 | ||
b2c306be BJ |
9 | char dayw[] = { |
10 | " S M Tu W Th F S" | |
11 | }; | |
12 | char *smon[]= { | |
13 | "January", "February", "March", "April", | |
14 | "May", "June", "July", "August", | |
15 | "September", "October", "November", "December", | |
16 | }; | |
17 | char string[432]; | |
18 | main(argc, argv) | |
19 | char *argv[]; | |
20 | { | |
21 | register y, i, j; | |
22 | int m; | |
23 | ||
b2c306be BJ |
24 | if(argc == 2) |
25 | goto xlong; | |
2fbd0239 SL |
26 | /* |
27 | * print out just month | |
28 | */ | |
29 | if(argc < 2) { /* current month */ | |
30 | time_t t; | |
31 | struct tm *tm; | |
b2c306be | 32 | |
2fbd0239 SL |
33 | t = time(0); |
34 | tm = localtime(&t); | |
35 | m = tm->tm_mon + 1; | |
36 | y = tm->tm_year + 1900; | |
37 | } else { | |
38 | m = atoi(argv[1]); | |
39 | if(m<1 || m>12) { | |
40 | fprintf(stderr, "cal: %s: Bad month.\n", argv[1]); | |
41 | exit(1); | |
42 | } | |
43 | y = atoi(argv[2]); | |
44 | if(y<1 || y>9999) { | |
45 | fprintf(stderr, "cal: %s: Bad year.\n", argv[2]); | |
46 | exit(2); | |
47 | } | |
48 | } | |
b2c306be BJ |
49 | printf(" %s %u\n", smon[m-1], y); |
50 | printf("%s\n", dayw); | |
51 | cal(m, y, string, 24); | |
52 | for(i=0; i<6*24; i+=24) | |
53 | pstr(string+i, 24); | |
54 | exit(0); | |
55 | ||
b2c306be | 56 | xlong: |
2fbd0239 SL |
57 | /* |
58 | * print out complete year | |
59 | */ | |
60 | y = atoi(argv[1]); | |
61 | if(y<1 || y>9999) { | |
62 | fprintf(stderr, "cal: %s: Bad year.\n", argv[1]); | |
63 | exit(2); | |
64 | } | |
b2c306be BJ |
65 | printf("\n\n\n"); |
66 | printf(" %u\n", y); | |
67 | printf("\n"); | |
68 | for(i=0; i<12; i+=3) { | |
69 | for(j=0; j<6*72; j++) | |
70 | string[j] = '\0'; | |
71 | printf(" %.3s", smon[i]); | |
72 | printf(" %.3s", smon[i+1]); | |
73 | printf(" %.3s\n", smon[i+2]); | |
74 | printf("%s %s %s\n", dayw, dayw, dayw); | |
75 | cal(i+1, y, string, 72); | |
76 | cal(i+2, y, string+23, 72); | |
77 | cal(i+3, y, string+46, 72); | |
78 | for(j=0; j<6*72; j+=72) | |
79 | pstr(string+j, 72); | |
80 | } | |
81 | printf("\n\n\n"); | |
82 | exit(0); | |
b2c306be BJ |
83 | } |
84 | ||
85 | pstr(str, n) | |
86 | char *str; | |
87 | { | |
88 | register i; | |
89 | register char *s; | |
90 | ||
91 | s = str; | |
92 | i = n; | |
93 | while(i--) | |
94 | if(*s++ == '\0') | |
95 | s[-1] = ' '; | |
96 | i = n+1; | |
97 | while(i--) | |
98 | if(*--s != ' ') | |
99 | break; | |
100 | s[1] = '\0'; | |
101 | printf("%s\n", str); | |
102 | } | |
103 | ||
104 | char mon[] = { | |
105 | 0, | |
106 | 31, 29, 31, 30, | |
107 | 31, 30, 31, 31, | |
108 | 30, 31, 30, 31, | |
109 | }; | |
110 | ||
111 | cal(m, y, p, w) | |
112 | char *p; | |
113 | { | |
114 | register d, i; | |
115 | register char *s; | |
116 | ||
117 | s = p; | |
118 | d = jan1(y); | |
119 | mon[2] = 29; | |
120 | mon[9] = 30; | |
121 | ||
122 | switch((jan1(y+1)+7-d)%7) { | |
123 | ||
124 | /* | |
125 | * non-leap year | |
126 | */ | |
127 | case 1: | |
128 | mon[2] = 28; | |
129 | break; | |
130 | ||
131 | /* | |
132 | * 1752 | |
133 | */ | |
134 | default: | |
135 | mon[9] = 19; | |
136 | break; | |
137 | ||
138 | /* | |
139 | * leap year | |
140 | */ | |
141 | case 2: | |
142 | ; | |
143 | } | |
144 | for(i=1; i<m; i++) | |
145 | d += mon[i]; | |
146 | d %= 7; | |
147 | s += 3*d; | |
148 | for(i=1; i<=mon[m]; i++) { | |
149 | if(i==3 && mon[m]==19) { | |
150 | i += 11; | |
151 | mon[m] += 11; | |
152 | } | |
153 | if(i > 9) | |
154 | *s = i/10+'0'; | |
155 | s++; | |
156 | *s++ = i%10+'0'; | |
157 | s++; | |
158 | if(++d == 7) { | |
159 | d = 0; | |
160 | s = p+w; | |
161 | p = s; | |
162 | } | |
163 | } | |
164 | } | |
165 | ||
166 | /* | |
167 | * return day of the week | |
168 | * of jan 1 of given year | |
169 | */ | |
170 | ||
171 | jan1(yr) | |
172 | { | |
173 | register y, d; | |
174 | ||
175 | /* | |
176 | * normal gregorian calendar | |
177 | * one extra day per four years | |
178 | */ | |
179 | ||
180 | y = yr; | |
181 | d = 4+y+(y+3)/4; | |
182 | ||
183 | /* | |
184 | * julian calendar | |
185 | * regular gregorian | |
186 | * less three days per 400 | |
187 | */ | |
188 | ||
189 | if(y > 1800) { | |
190 | d -= (y-1701)/100; | |
191 | d += (y-1601)/400; | |
192 | } | |
193 | ||
194 | /* | |
195 | * great calendar changeover instant | |
196 | */ | |
197 | ||
198 | if(y > 1752) | |
199 | d += 3; | |
200 | ||
201 | return(d%7); | |
202 | } |