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81 lines
2.0 KiB
81 lines
2.0 KiB
/* comm.c - select or reject lines common to two files
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*
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* Copyright 2012 Ilya Kuzmich <ikv@safe-mail.net>
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*
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* See http://opengroup.org/onlinepubs/9699919799/utilities/comm.html
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// <# and ># take single digit, so 321 define flags
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USE_COMM(NEWTOY(comm, "<2>2321", TOYFLAG_USR|TOYFLAG_BIN))
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config COMM
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bool "comm"
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default y
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help
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usage: comm [-123] FILE1 FILE2
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Read FILE1 and FILE2, which should be ordered, and produce three text
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columns as output: lines only in FILE1; lines only in FILE2; and lines
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in both files. Filename "-" is a synonym for stdin.
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-1 Suppress the output column of lines unique to FILE1
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-2 Suppress the output column of lines unique to FILE2
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-3 Suppress the output column of lines duplicated in FILE1 and FILE2
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*/
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#define FOR_comm
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#include "toys.h"
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static void writeline(const char *line, int col)
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{
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if (col == 0 && toys.optflags & FLAG_1) return;
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else if (col == 1) {
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if (toys.optflags & FLAG_2) return;
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if (!(toys.optflags & FLAG_1)) putchar('\t');
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} else if (col == 2) {
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if (toys.optflags & FLAG_3) return;
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if (!(toys.optflags & FLAG_1)) putchar('\t');
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if (!(toys.optflags & FLAG_2)) putchar('\t');
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}
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puts(line);
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}
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void comm_main(void)
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{
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int file[2];
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char *line[2];
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int i;
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if (toys.optflags == 7) return;
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for (i = 0; i < 2; i++) {
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file[i] = xopenro(toys.optargs[i]);
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line[i] = get_line(file[i]);
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}
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while (line[0] && line[1]) {
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int order = strcmp(line[0], line[1]);
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if (order == 0) {
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writeline(line[0], 2);
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for (i = 0; i < 2; i++) {
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free(line[i]);
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line[i] = get_line(file[i]);
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}
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} else {
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i = order < 0 ? 0 : 1;
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writeline(line[i], i);
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free(line[i]);
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line[i] = get_line(file[i]);
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}
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}
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/* print rest of the longer file */
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for (i = line[0] ? 0 : 1; line[i];) {
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writeline(line[i], i);
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free(line[i]);
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line[i] = get_line(file[i]);
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}
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if (CFG_TOYBOX_FREE) for (i = 0; i < 2; i++) xclose(file[i]);
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}
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