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1.1 root 1: #ifndef lint
2: static char sccsid[] = "@(#)cal.c 4.3 (Berkeley) 83/08/11";
3: #endif
4:
5: char dayw[] = {
6: " S M Tu W Th F S"
7: };
8: char *smon[]= {
9: "January", "February", "March", "April",
10: "May", "June", "July", "August",
11: "September", "October", "November", "December",
12: };
13: char string[432];
14: main(argc, argv)
15: char *argv[];
16: {
17: register y, i, j;
18: int m;
19:
20: if(argc < 2) {
21: printf("usage: cal [month] year\n");
22: exit(0);
23: }
24: if(argc == 2)
25: goto xlong;
26:
27: /*
28: * print out just month
29: */
30:
31: m = number(argv[1]);
32: if(m<1 || m>12)
33: goto badarg;
34: y = number(argv[2]);
35: if(y<1 || y>9999)
36: goto badarg;
37: printf(" %s %u\n", smon[m-1], y);
38: printf("%s\n", dayw);
39: cal(m, y, string, 24);
40: for(i=0; i<6*24; i+=24)
41: pstr(string+i, 24);
42: exit(0);
43:
44: /*
45: * print out complete year
46: */
47:
48: xlong:
49: y = number(argv[1]);
50: if(y<1 || y>9999)
51: goto badarg;
52: printf("\n\n\n");
53: printf(" %u\n", y);
54: printf("\n");
55: for(i=0; i<12; i+=3) {
56: for(j=0; j<6*72; j++)
57: string[j] = '\0';
58: printf(" %.3s", smon[i]);
59: printf(" %.3s", smon[i+1]);
60: printf(" %.3s\n", smon[i+2]);
61: printf("%s %s %s\n", dayw, dayw, dayw);
62: cal(i+1, y, string, 72);
63: cal(i+2, y, string+23, 72);
64: cal(i+3, y, string+46, 72);
65: for(j=0; j<6*72; j+=72)
66: pstr(string+j, 72);
67: }
68: printf("\n\n\n");
69: exit(0);
70:
71: badarg:
72: printf("Bad argument\n");
73: }
74:
75: number(str)
76: char *str;
77: {
78: register n, c;
79: register char *s;
80:
81: n = 0;
82: s = str;
83: while(c = *s++) {
84: if(c<'0' || c>'9')
85: return(0);
86: n = n*10 + c-'0';
87: }
88: return(n);
89: }
90:
91: pstr(str, n)
92: char *str;
93: {
94: register i;
95: register char *s;
96:
97: s = str;
98: i = n;
99: while(i--)
100: if(*s++ == '\0')
101: s[-1] = ' ';
102: i = n+1;
103: while(i--)
104: if(*--s != ' ')
105: break;
106: s[1] = '\0';
107: printf("%s\n", str);
108: }
109:
110: char mon[] = {
111: 0,
112: 31, 29, 31, 30,
113: 31, 30, 31, 31,
114: 30, 31, 30, 31,
115: };
116:
117: cal(m, y, p, w)
118: char *p;
119: {
120: register d, i;
121: register char *s;
122:
123: s = p;
124: d = jan1(y);
125: mon[2] = 29;
126: mon[9] = 30;
127:
128: switch((jan1(y+1)+7-d)%7) {
129:
130: /*
131: * non-leap year
132: */
133: case 1:
134: mon[2] = 28;
135: break;
136:
137: /*
138: * 1752
139: */
140: default:
141: mon[9] = 19;
142: break;
143:
144: /*
145: * leap year
146: */
147: case 2:
148: ;
149: }
150: for(i=1; i<m; i++)
151: d += mon[i];
152: d %= 7;
153: s += 3*d;
154: for(i=1; i<=mon[m]; i++) {
155: if(i==3 && mon[m]==19) {
156: i += 11;
157: mon[m] += 11;
158: }
159: if(i > 9)
160: *s = i/10+'0';
161: s++;
162: *s++ = i%10+'0';
163: s++;
164: if(++d == 7) {
165: d = 0;
166: s = p+w;
167: p = s;
168: }
169: }
170: }
171:
172: /*
173: * return day of the week
174: * of jan 1 of given year
175: */
176:
177: jan1(yr)
178: {
179: register y, d;
180:
181: /*
182: * normal gregorian calendar
183: * one extra day per four years
184: */
185:
186: y = yr;
187: d = 4+y+(y+3)/4;
188:
189: /*
190: * julian calendar
191: * regular gregorian
192: * less three days per 400
193: */
194:
195: if(y > 1800) {
196: d -= (y-1701)/100;
197: d += (y-1601)/400;
198: }
199:
200: /*
201: * great calendar changeover instant
202: */
203:
204: if(y > 1752)
205: d += 3;
206:
207: return(d%7);
208: }
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