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cmp.c - sbase - suckless unix tools |
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--- |
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cmp.c (1419B) |
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--- |
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1 /* See LICENSE file for copyright and license details. */ |
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2 #include <stdio.h> |
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3 #include <stdlib.h> |
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4 #include <string.h> |
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5 |
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6 #include "util.h" |
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7 |
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8 static void |
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9 usage(void) |
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10 { |
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11 enprintf(2, "usage: %s [-l | -s] file1 file2\n", argv0); |
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12 } |
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13 |
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14 int |
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15 main(int argc, char *argv[]) |
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16 { |
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17 FILE *fp[2]; |
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18 size_t line = 1, n; |
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19 int ret = 0, lflag = 0, sflag = 0, same = 1, b[2]; |
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20 |
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21 ARGBEGIN { |
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22 case 'l': |
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23 lflag = 1; |
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24 break; |
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25 case 's': |
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26 sflag = 1; |
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27 break; |
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28 default: |
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29 usage(); |
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30 } ARGEND |
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31 |
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32 if (argc != 2 || (lflag && sflag)) |
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33 usage(); |
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34 |
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35 for (n = 0; n < 2; n++) { |
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36 if (!strcmp(argv[n], "-")) { |
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37 argv[n] = "<stdin>"; |
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38 fp[n] = stdin; |
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39 } else { |
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40 if (!(fp[n] = fopen(argv[n], "r"))) { |
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41 if (!sflag) |
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42 weprintf("fopen %s:", argv[n]); |
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43 return 2; |
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44 } |
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45 } |
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46 } |
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47 |
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48 for (n = 1; ; n++) { |
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49 b[0] = getc(fp[0]); |
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50 b[1] = getc(fp[1]); |
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51 |
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52 if (b[0] == b[1]) { |
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53 if (b[0] == EOF) |
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54 break; |
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55 else if (b[0] == '\n') |
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56 line++; |
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57 continue; |
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58 } else if (b[0] == EOF || b[1] == EOF) { |
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59 if (!sflag) |
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60 weprintf("EOF on %s\n", argv[(b[0] != EO… |
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61 same = 0; |
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62 break; |
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63 } else if (!lflag) { |
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64 if (!sflag) |
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65 printf("%s %s differ: byte %zu, line %zu… |
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66 argv[0], argv[1], n, line); |
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67 same = 0; |
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68 break; |
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69 } else { |
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70 printf("%zu %o %o\n", n, b[0], b[1]); |
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71 same = 0; |
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72 } |
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73 } |
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74 |
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75 if (!ret) |
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76 ret = !same; |
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77 if (fshut(fp[0], argv[0]) | (fp[0] != fp[1] && fshut(fp[1], argv… |
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78 fshut(stdout, "<stdout>")) |
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79 ret = 2; |
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80 |
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81 return ret; |
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82 } |
