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