| 1 | #include <stdio.h> |
| 2 | #define LB 256 |
| 3 | int one; |
| 4 | int two; |
| 5 | int three; |
| 6 | |
| 7 | char *ldr[3]; |
| 8 | |
| 9 | FILE *ib1; |
| 10 | FILE *ib2; |
| 11 | FILE *openfil(); |
| 12 | main(argc,argv) |
| 13 | char *argv[]; |
| 14 | { |
| 15 | int l; |
| 16 | char lb1[LB],lb2[LB]; |
| 17 | |
| 18 | ldr[0] = ""; |
| 19 | ldr[1] = "\t"; |
| 20 | ldr[2] = "\t\t"; |
| 21 | if(argc > 1) { |
| 22 | if(*argv[1] == '-' && argv[1][1] != 0) { |
| 23 | l = 1; |
| 24 | while(*++argv[1]) { |
| 25 | switch(*argv[1]) { |
| 26 | case'1': |
| 27 | if(!one) { |
| 28 | one = 1; |
| 29 | ldr[1][0] = |
| 30 | ldr[2][l--] = '\0'; |
| 31 | } |
| 32 | break; |
| 33 | case '2': |
| 34 | if(!two) { |
| 35 | two = 1; |
| 36 | ldr[2][l--] = '\0'; |
| 37 | } |
| 38 | break; |
| 39 | case '3': |
| 40 | three = 1; |
| 41 | break; |
| 42 | default: |
| 43 | fprintf(stderr,"comm: illegal flag\n"); |
| 44 | exit(1); |
| 45 | } |
| 46 | } |
| 47 | argv++; |
| 48 | argc--; |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | if(argc < 3) { |
| 53 | fprintf(stderr,"comm: arg count\n"); |
| 54 | exit(1); |
| 55 | } |
| 56 | |
| 57 | ib1 = openfil(argv[1]); |
| 58 | ib2 = openfil(argv[2]); |
| 59 | |
| 60 | |
| 61 | if(rd(ib1,lb1) < 0) { |
| 62 | if(rd(ib2,lb2) < 0) exit(0); |
| 63 | copy(ib2,lb2,2); |
| 64 | } |
| 65 | if(rd(ib2,lb2) < 0) copy(ib1,lb1,1); |
| 66 | |
| 67 | while(1) { |
| 68 | |
| 69 | switch(compare(lb1,lb2)) { |
| 70 | |
| 71 | case 0: |
| 72 | wr(lb1,3); |
| 73 | if(rd(ib1,lb1) < 0) { |
| 74 | if(rd(ib2,lb2) < 0) exit(0); |
| 75 | copy(ib2,lb2,2); |
| 76 | } |
| 77 | if(rd(ib2,lb2) < 0) copy(ib1,lb1,1); |
| 78 | continue; |
| 79 | |
| 80 | case 1: |
| 81 | wr(lb1,1); |
| 82 | if(rd(ib1,lb1) < 0) copy(ib2,lb2,2); |
| 83 | continue; |
| 84 | |
| 85 | case 2: |
| 86 | wr(lb2,2); |
| 87 | if(rd(ib2,lb2) < 0) copy(ib1,lb1,1); |
| 88 | continue; |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | rd(file,buf) |
| 94 | FILE *file; |
| 95 | char *buf; |
| 96 | { |
| 97 | |
| 98 | register int i, c; |
| 99 | i = 0; |
| 100 | while((c = getc(file)) != EOF) { |
| 101 | *buf = c; |
| 102 | if(c == '\n' || i > LB-2) { |
| 103 | *buf = '\0'; |
| 104 | return(0); |
| 105 | } |
| 106 | i++; |
| 107 | buf++; |
| 108 | } |
| 109 | return(-1); |
| 110 | } |
| 111 | |
| 112 | wr(str,n) |
| 113 | char *str; |
| 114 | { |
| 115 | |
| 116 | switch(n) { |
| 117 | |
| 118 | case 1: |
| 119 | if(one) return; |
| 120 | break; |
| 121 | |
| 122 | case 2: |
| 123 | if(two) return; |
| 124 | break; |
| 125 | |
| 126 | case 3: |
| 127 | if(three) return; |
| 128 | } |
| 129 | printf("%s%s\n",ldr[n-1],str); |
| 130 | } |
| 131 | |
| 132 | copy(ibuf,lbuf,n) |
| 133 | FILE *ibuf; |
| 134 | char *lbuf; |
| 135 | { |
| 136 | do { |
| 137 | wr(lbuf,n); |
| 138 | } while(rd(ibuf,lbuf) >= 0); |
| 139 | |
| 140 | exit(0); |
| 141 | } |
| 142 | |
| 143 | compare(a,b) |
| 144 | char *a,*b; |
| 145 | { |
| 146 | register char *ra,*rb; |
| 147 | |
| 148 | ra = --a; |
| 149 | rb = --b; |
| 150 | while(*++ra == *++rb) |
| 151 | if(*ra == '\0') return(0); |
| 152 | if(*ra < *rb) return(1); |
| 153 | return(2); |
| 154 | } |
| 155 | FILE *openfil(s) |
| 156 | char *s; |
| 157 | { |
| 158 | FILE *b; |
| 159 | if(s[0]=='-' && s[1]==0) |
| 160 | b = stdin; |
| 161 | else if((b=fopen(s,"r")) == NULL) { |
| 162 | fprintf(stderr,"comm: cannot open %s\n",s); |
| 163 | exit(1); |
| 164 | } |
| 165 | return(b); |
| 166 | } |