2.9BSD - /usr/src/cmd/cmp.c

   1: #include <stdio.h>
   2: #include <ctype.h>
   3: 
   4: FILE    *file1,*file2;
   5: int eflg;
   6: int lflg    = 1;
   7: long    line    = 1;
   8: long    chr = 0;
   9: long    skip1;
  10: long    skip2;
  11: 
  12: long    otoi();
  13: 
  14: main(argc, argv)
  15: char **argv;
  16: {
  17:     register c1, c2;
  18:     char *arg;
  19: 
  20:     if(argc < 3)
  21:         goto narg;
  22:     arg = argv[1];
  23:     if(arg[0] == '-' && arg[1] == 's') {
  24:         lflg--;
  25:         argv++;
  26:         argc--;
  27:     }
  28:     arg = argv[1];
  29:     if(arg[0] == '-' && arg[1] == 'l') {
  30:         lflg++;
  31:         argv++;
  32:         argc--;
  33:     }
  34:     if(argc < 3)
  35:         goto narg;
  36:     arg = argv[1];
  37:     if( arg[0]=='-' && arg[1]==0 )
  38:         file1 = stdin;
  39:     else if((file1 = fopen(arg, "r")) == NULL)
  40:         goto barg;
  41:     arg = argv[2];
  42:     if((file2 = fopen(arg, "r")) == NULL)
  43:         goto barg;
  44:     if (argc>3)
  45:         skip1 = otoi(argv[3]);
  46:     if (argc>4)
  47:         skip2 = otoi(argv[4]);
  48:     while (skip1) {
  49:         if ((c1 = getc(file1)) == EOF) {
  50:             arg = argv[1];
  51:             goto earg;
  52:         }
  53:         skip1--;
  54:     }
  55:     while (skip2) {
  56:         if ((c2 = getc(file2)) == EOF) {
  57:             arg = argv[2];
  58:             goto earg;
  59:         }
  60:         skip2--;
  61:     }
  62: 
  63: loop:
  64:     chr++;
  65:     c1 = getc(file1);
  66:     c2 = getc(file2);
  67:     if(c1 == c2) {
  68:         if (c1 == '\n')
  69:             line++;
  70:         if(c1 == EOF) {
  71:             if(eflg)
  72:                 exit(1);
  73:             exit(0);
  74:         }
  75:         goto loop;
  76:     }
  77:     if(lflg == 0)
  78:         exit(1);
  79:     if(c1 == EOF) {
  80:         arg = argv[1];
  81:         goto earg;
  82:     }
  83:     if(c2 == EOF)
  84:         goto earg;
  85:     if(lflg == 1) {
  86:         printf("%s %s differ: char %ld, line %ld\n", argv[1], arg,
  87:             chr, line);
  88:         exit(1);
  89:     }
  90:     eflg = 1;
  91:     printf("%6ld %3o %3o\n", chr, c1, c2);
  92:     goto loop;
  93: 
  94: narg:
  95:     printf("cmp: arg count\n");
  96:     exit(2);
  97: 
  98: barg:
  99:     if (lflg)
 100:     printf("cmp: cannot open %s\n", arg);
 101:     exit(2);
 102: 
 103: earg:
 104:     printf("cmp: EOF on %s\n", arg);
 105:     exit(1);
 106: }
 107: 
 108: long otoi(s)
 109: char *s;
 110: {
 111:     long v;
 112:     int base;
 113: 
 114:     v = 0;
 115:     base = 10;
 116:     if (*s == '0')
 117:         base = 8;
 118:     while(isdigit(*s))
 119:         v = v*base + *s++ - '0';
 120:     return(v);
 121: }

Defined functions

Defined variables