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cmp.c - 9base - revived minimalist port of Plan 9 userland to Unix |
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git clone git://git.suckless.org/9base |
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--- |
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cmp.c (2098B) |
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--- |
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1 #include <u.h> |
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2 #include <libc.h> |
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3 |
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4 #define BUF 65536 |
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5 |
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6 int sflag = 0; |
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7 int lflag = 0; |
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8 int Lflag = 0; |
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9 |
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10 static void usage(void); |
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11 |
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12 void |
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13 main(int argc, char *argv[]) |
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14 { |
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15 int n, i; |
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16 uchar *p, *q; |
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17 uchar buf1[BUF], buf2[BUF]; |
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18 int f1, f2; |
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19 vlong nc = 1, o, l = 1; |
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20 char *name1, *name2; |
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21 uchar *b1s, *b1e, *b2s, *b2e; |
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22 |
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23 ARGBEGIN{ |
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24 case 's': sflag = 1; break; |
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25 case 'l': lflag = 1; break; |
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26 case 'L': Lflag = 1; break; |
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27 default: usage(); |
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28 }ARGEND |
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29 if(argc < 2) |
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30 usage(); |
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31 if((f1 = open(name1 = *argv++, OREAD)) == -1){ |
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32 if(!sflag) perror(name1); |
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33 exits("open"); |
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34 } |
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35 if((f2 = open(name2 = *argv++, OREAD)) == -1){ |
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36 if(!sflag) perror(name2); |
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37 exits("open"); |
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38 } |
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39 if(*argv){ |
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40 o = strtoll(*argv++, 0, 0); |
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41 if(seek(f1, o, 0) < 0){ |
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42 if(!sflag) perror("cmp: seek by offset1"); |
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43 exits("seek 1"); |
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44 } |
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45 } |
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46 if(*argv){ |
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47 o = strtoll(*argv++, 0, 0); |
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48 if(seek(f2, o, 0) < 0){ |
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49 if(!sflag) perror("cmp: seek by offset2"); |
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50 exits("seek 2"); |
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51 } |
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52 } |
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53 if(*argv) |
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54 usage(); |
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55 b1s = b1e = buf1; |
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56 b2s = b2e = buf2; |
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57 for(;;){ |
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58 if(b1s >= b1e){ |
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59 if(b1s >= &buf1[BUF]) |
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60 b1s = buf1; |
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61 n = read(f1, b1s, &buf1[BUF] - b1s); |
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62 b1e = b1s + n; |
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63 } |
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64 if(b2s >= b2e){ |
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65 if(b2s >= &buf2[BUF]) |
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66 b2s = buf2; |
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67 n = read(f2, b2s, &buf2[BUF] - b2s); |
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68 b2e = b2s + n; |
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69 } |
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70 n = b2e - b2s; |
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71 if(n > b1e - b1s) |
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72 n = b1e - b1s; |
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73 if(n <= 0) |
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74 break; |
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75 if(memcmp((void *)b1s, (void *)b2s, n) != 0){ |
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76 if(sflag) |
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77 exits("differ"); |
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78 for(p = b1s, q = b2s, i = 0; i < n; p++, q++, i+… |
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79 if(*p == '\n') |
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80 l++; |
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81 if(*p != *q){ |
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82 if(!lflag){ |
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83 print("%s %s differ: cha… |
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84 name1, name2, nc+i); |
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85 print(Lflag?" line %lld\… |
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86 exits("differ"); |
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87 } |
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88 print("%6lld 0x%.2x 0x%.2x\n", n… |
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89 } |
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90 } |
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91 } |
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92 if(Lflag) |
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93 for(p = b1s; p < b1e;) |
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94 if(*p++ == '\n') |
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95 l++; |
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96 nc += n; |
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97 b1s += n; |
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98 b2s += n; |
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99 } |
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100 if(b1e - b1s == b2e - b2s) |
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101 exits((char *)0); |
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102 if(!sflag) |
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103 print("EOF on %s\n", (b1e - b1s > b2e - b2s)? name2 : na… |
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104 exits("EOF"); |
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105 } |
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106 |
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107 static void |
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108 usage(void) |
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109 { |
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110 print("Usage: cmp [-lsL] file1 file2 [offset1 [offset2] ]\n"); |
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111 exits("usage"); |
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112 } |
