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