Mercurial > hg > toybox
annotate toys/posix/comm.c @ 656:6df4ccc0acbe
Regularize command headers, update links to standards documents.
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Sat, 25 Aug 2012 18:08:51 -0500 |
| parents | 2986aa63a021 |
| children | 7e846e281e38 |
| rev | line source |
|---|---|
| 557 | 1 /* vi: set sw=4 ts=4: |
| 2 * | |
| 3 * comm.c - select or reject lines common to two files | |
| 4 * | |
| 5 * Copyright 2012 Ilya Kuzmich <ikv@safe-mail.net> | |
| 6 * | |
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Regularize command headers, update links to standards documents.
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/comm.html |
| 557 | 8 |
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Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
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9 // <# and ># take single digit, so 321 define flags |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
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10 USE_COMM(NEWTOY(comm, "<2>2321", TOYFLAG_USR|TOYFLAG_BIN)) |
| 557 | 11 |
| 12 config COMM | |
| 13 bool "comm" | |
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Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
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changeset
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14 default y |
| 557 | 15 help |
| 16 usage: comm [-123] FILE1 FILE2 | |
| 17 | |
| 18 Reads FILE1 and FILE2, which should be ordered, and produces three text | |
| 19 columns as output: lines only in FILE1; lines only in FILE2; and lines | |
| 20 in both files. Filename "-" is a synonym for stdin. | |
| 21 | |
| 22 -1 suppress the output column of lines unique to FILE1 | |
| 23 -2 suppress the output column of lines unique to FILE2 | |
| 24 -3 suppress the output column of lines duplicated in FILE1 and FILE2 | |
| 25 */ | |
| 26 | |
| 27 #include "toys.h" | |
| 28 | |
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Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
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changeset
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29 #define FLAG_1 1 |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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30 #define FLAG_2 2 |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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31 #define FLAG_3 4 |
| 557 | 32 |
| 33 static void writeline(const char *line, int col) | |
| 34 { | |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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35 if (col == 0 && toys.optflags & FLAG_1) return; |
| 557 | 36 else if (col == 1) { |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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37 if (toys.optflags & FLAG_2) return; |
|
2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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38 if (!(toys.optflags & FLAG_1)) putchar('\t'); |
| 557 | 39 } else if (col == 2) { |
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614
2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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40 if (toys.optflags & FLAG_3) return; |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
|
41 if (!(toys.optflags & FLAG_1)) putchar('\t'); |
|
2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
|
42 if (!(toys.optflags & FLAG_2)) putchar('\t'); |
| 557 | 43 } |
| 44 puts(line); | |
| 45 } | |
| 46 | |
| 47 void comm_main(void) | |
| 48 { | |
| 49 int file[2]; | |
| 50 char *line[2]; | |
| 51 int i; | |
| 52 | |
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2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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53 if (toys.optflags == 7) return; |
| 557 | 54 |
| 55 for (i = 0; i < 2; i++) { | |
| 56 file[i] = strcmp("-", toys.optargs[i]) ? xopen(toys.optargs[i], O_RDONLY) : 0; | |
| 57 line[i] = get_line(file[i]); | |
| 58 } | |
| 59 | |
| 60 while (line[0] && line[1]) { | |
| 61 int order = strcmp(line[0], line[1]); | |
| 62 | |
| 63 if (order == 0) { | |
| 64 writeline(line[0], 2); | |
| 65 for (i = 0; i < 2; i++) { | |
| 66 free(line[i]); | |
| 67 line[i] = get_line(file[i]); | |
| 68 } | |
| 69 } else { | |
| 70 i = order < 0 ? 0 : 1; | |
| 71 writeline(line[i], i); | |
| 72 free(line[i]); | |
| 73 line[i] = get_line(file[i]); | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 /* print rest of the longer file */ | |
| 78 for (i = line[0] ? 0 : 1; line[i];) { | |
| 79 writeline(line[i], i); | |
| 80 free(line[i]); | |
| 81 line[i] = get_line(file[i]); | |
| 82 } | |
| 83 | |
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614
2b40588a3d25
Minor cleanups and refactoring. Make FLAG macros closer to what should eventually be generated for us by the build infrastructure.
Rob Landley <rob@landley.net>
parents:
557
diff
changeset
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84 if (CFG_TOYBOX_FREE) for (i = 0; i < 2; i--) xclose(file[i]); |
| 557 | 85 } |