/* cmp.c - Compare two files. * * Copyright 2012 Timothy Elliott <tle@holymonkey.com> * * See http://opengroup.org/onlinepubs/9699919799/utilities/cmp.html USE_CMP(NEWTOY(cmp, "<1>2ls(silent)(quiet)[!ls]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_ARGFAIL(2))) config CMP bool "cmp" default y help usage: cmp [-l] [-s] FILE1 [FILE2 [SKIP1 [SKIP2]]] Compare the contents of two files. (Or stdin and file if only one given.) -l Show all differing bytes -s Silent */ #define FOR_cmp #include "toys.h" GLOBALS( int fd; char *name; ) static void do_cmp(int fd, char *name) { int i, len1, len2, min_len, size = sizeof(toybuf)/2; long byte_no = 1, line_no = 1; char *buf2 = toybuf+size; // First time through, cache the data and return. if (!TT.fd) { TT.name = name; // On return the old filehandle is closed, and this assures that even // if we were called with stdin closed, the new filehandle != 0. TT.fd = dup(fd); return; } toys.exitval = 0; for (;;) { len1 = readall(TT.fd, toybuf, size); len2 = readall(fd, buf2, size); min_len = len1 < len2 ? len1 : len2; for (i=0; i<min_len; i++) { if (toybuf[i] != buf2[i]) { toys.exitval = 1; if (toys.optflags & FLAG_l) printf("%ld %o %o\n", byte_no, toybuf[i], buf2[i]); else { if (!(toys.optflags & FLAG_s)) printf("%s %s differ: char %ld, line %ld\n", TT.name, name, byte_no, line_no); goto out; } } byte_no++; if (toybuf[i] == '\n') line_no++; } if (len1 != len2) { if (!(toys.optflags & FLAG_s)) fprintf(stderr, "cmp: EOF on %s\n", len1 < len2 ? TT.name : name); toys.exitval = 1; break; } if (len1 < 1) break; } out: if (CFG_TOYBOX_FREE) close(TT.fd); } void cmp_main(void) { toys.exitval = 2; loopfiles_rw(toys.optargs, O_CLOEXEC|(WARN_ONLY*!(toys.optflags&FLAG_s)), 0, do_cmp); if (toys.optc == 1) do_cmp(0, "-"); }