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(silent)(quiet)[!ls]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(2))) 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 static void do_cmp(int fd, char *name) 30 { 31 int i, len1, len2, min_len, size = sizeof(toybuf)/2; 32 long byte_no = 1, line_no = 1; 33 char *buf2 = toybuf+size; 34 35 // First time through, cache the data and return. 36 if (!TT.fd) { 37 TT.name = name; 38 // On return the old filehandle is closed, and this assures that even 39 // if we were called with stdin closed, the new filehandle != 0. 40 TT.fd = dup(fd); 41 return; 42 } 43 44 toys.exitval = 0; 45 46 for (;;) { 47 len1 = readall(TT.fd, toybuf, size); 48 len2 = readall(fd, buf2, size); 49 50 min_len = len1 < len2 ? len1 : len2; 51 for (i=0; i<min_len; i++) { 52 if (toybuf[i] != buf2[i]) { 53 toys.exitval = 1; 54 if (toys.optflags & FLAG_l) 55 printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]); 56 else { 57 if (!(toys.optflags & FLAG_s)) 58 printf("%s %s differ: char %ld, line %ld\n", 59 TT.name, name, byte_no, line_no); 60 goto out; 61 } 62 } 63 byte_no++; 64 if (toybuf[i] == '\n') line_no++; 65 } 66 if (len1 != len2) { 67 if (!(toys.optflags & FLAG_s)) 68 fprintf(stderr, "cmp: EOF on %s\n", len1 < len2 ? TT.name : name); 69 toys.exitval = 1; 70 break; 71 } 72 if (len1 < 1) break; 73 } 74 out: 75 if (CFG_TOYBOX_FREE) close(TT.fd); 76 } 77 78 void cmp_main(void) 79 { 80 toys.exitval = 2; 81 loopfiles_rw(toys.optargs, O_CLOEXEC|(WARN_ONLY*!(toys.optflags&FLAG_s)), 0, 82 do_cmp); 83 } 84
