1 /* comm.c - select or reject lines common to two files 2 * 3 * Copyright 2012 Ilya Kuzmich <ikv (at) safe-mail.net> 4 * 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/comm.html 6 7 // <# and ># take single digit, so 321 define flags 8 USE_COMM(NEWTOY(comm, "<2>2321", TOYFLAG_USR|TOYFLAG_BIN)) 9 10 config COMM 11 bool "comm" 12 default y 13 help 14 usage: comm [-123] FILE1 FILE2 15 16 Read FILE1 and FILE2, which should be ordered, and produce three text 17 columns as output: lines only in FILE1; lines only in FILE2; and lines 18 in both files. Filename "-" is a synonym for stdin. 19 20 -1 Suppress the output column of lines unique to FILE1 21 -2 Suppress the output column of lines unique to FILE2 22 -3 Suppress the output column of lines duplicated in FILE1 and FILE2 23 */ 24 25 #define FOR_comm 26 #include "toys.h" 27 28 static void writeline(const char *line, int col) 29 { 30 if (col == 0 && toys.optflags & FLAG_1) return; 31 else if (col == 1) { 32 if (toys.optflags & FLAG_2) return; 33 if (!(toys.optflags & FLAG_1)) putchar('\t'); 34 } else if (col == 2) { 35 if (toys.optflags & FLAG_3) return; 36 if (!(toys.optflags & FLAG_1)) putchar('\t'); 37 if (!(toys.optflags & FLAG_2)) putchar('\t'); 38 } 39 puts(line); 40 } 41 42 void comm_main(void) 43 { 44 int file[2]; 45 char *line[2]; 46 int i; 47 48 if (toys.optflags == 7) return; 49 50 for (i = 0; i < 2; i++) { 51 file[i] = xopenro(toys.optargs[i]); 52 line[i] = get_line(file[i]); 53 } 54 55 while (line[0] && line[1]) { 56 int order = strcmp(line[0], line[1]); 57 58 if (order == 0) { 59 writeline(line[0], 2); 60 for (i = 0; i < 2; i++) { 61 free(line[i]); 62 line[i] = get_line(file[i]); 63 } 64 } else { 65 i = order < 0 ? 0 : 1; 66 writeline(line[i], i); 67 free(line[i]); 68 line[i] = get_line(file[i]); 69 } 70 } 71 72 /* print rest of the longer file */ 73 for (i = line[0] ? 0 : 1; line[i];) { 74 writeline(line[i], i); 75 free(line[i]); 76 line[i] = get_line(file[i]); 77 } 78 79 if (CFG_TOYBOX_FREE) for (i = 0; i < 2; i++) xclose(file[i]); 80 } 81
