1 /* cmp.c - Compare two files. 2 * 3 * Copyright 2012 Timothy Elliott <tle (at) holymonkey.com> 4 * 5 * See http://opengroup.org/onlinepubs/9699919799/utilities/cmp.html 6 7 USE_CMP(NEWTOY(cmp, "<2>2ls[!ls]", TOYFLAG_USR|TOYFLAG_BIN)) 8 9 config CMP 10 bool "cmp" 11 default y 12 help 13 usage: cmp [-l] [-s] FILE1 FILE2 14 15 Compare the contents of two files. 16 17 -l show all differing bytes 18 -s silent 19 */ 20 21 #define FOR_cmp 22 #include "toys.h" 23 24 GLOBALS( 25 int fd; 26 char *name; 27 ) 28 29 // This handles opening the file and 30 31 static void do_cmp(int fd, char *name) 32 { 33 int i, len1, len2, min_len, size = sizeof(toybuf)/2; 34 long byte_no = 1, line_no = 1; 35 char *buf2 = toybuf+size; 36 37 // First time through, cache the data and return. 38 if (!TT.fd) { 39 TT.name = name; 40 // On return the old filehandle is closed, and this assures that even 41 // if we were called with stdin closed, the new filehandle != 0. 42 TT.fd = dup(fd); 43 return; 44 } 45 46 toys.exitval = 0; 47 48 for (;;) { 49 len1 = readall(TT.fd, toybuf, size); 50 len2 = readall(fd, buf2, size); 51 52 min_len = len1 < len2 ? len1 : len2; 53 for (i=0; i<min_len; i++) { 54 if (toybuf[i] != buf2[i]) { 55 toys.exitval = 1; 56 if (toys.optflags & FLAG_l) 57 printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]); 58 else { 59 if (!(toys.optflags & FLAG_s)) 60 printf("%s %s differ: char %ld, line %ld\n", 61 TT.name, name, byte_no, line_no); 62 goto out; 63 } 64 } 65 byte_no++; 66 if (toybuf[i] == '\n') line_no++; 67 } 68 if (len1 != len2) { 69 if (!(toys.optflags & FLAG_s)) 70 fprintf(stderr, "cmp: EOF on %s\n", len1 < len2 ? TT.name : name); 71 toys.exitval = 1; 72 break; 73 } 74 if (len1 < 1) break; 75 } 76 out: 77 if (CFG_TOYBOX_FREE) close(TT.fd); 78 } 79 80 void cmp_main(void) 81 { 82 toys.exitval = 2; 83 loopfiles_rw(toys.optargs, O_CLOEXEC|(WARN_ONLY*!(toys.optflags&FLAG_s)), 0, 84 do_cmp); 85 } 86 87
