/* vi: set sw=4 ts=4: */ /* * uniq implementation for busybox * * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> * * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. */ /* BB_AUDIT SUSv3 compliant */ /* http://www.opengroup.org/onlinepubs/007904975/utilities/uniq.html */ #include "busybox.h" static const char uniq_opts[] = "f:s:" "cdu\0\1\2\4"; static FILE *xgetoptfile_uniq_s(char **argv, int read0write2) { const char *n; if ((n = *argv) != NULL) { if ((*n != '-') || n[1]) { return xfopen(n, "r\0w" + read0write2); } } return (read0write2) ? stdout : stdin; } int uniq_main(int argc, char **argv) { FILE *in, *out; unsigned long dups, skip_fields, skip_chars, i, uniq_flags; const char *s0, *e0, *s1, *e1, *input_filename; int opt; uniq_flags = skip_fields = skip_chars = 0; while ((opt = getopt(argc, argv, uniq_opts)) > 0) { if ((opt == 'f') || (opt == 's')) { int t = bb_xgetularg10(optarg); if (opt == 'f') { skip_fields = t; } else { skip_chars = t; } } else if ((s0 = strchr(uniq_opts, opt)) != NULL) { uniq_flags |= s0[4]; } else { bb_show_usage(); } } input_filename = *(argv += optind); in = xgetoptfile_uniq_s(argv, 0); if (*argv) { ++argv; } out = xgetoptfile_uniq_s(argv, 2); if (*argv && argv[1]) { bb_show_usage(); } s1 = e1 = NULL; /* prime the pump */ do { s0 = s1; e0 = e1; dups = 0; /* gnu uniq ignores newlines */ while ((s1 = bb_get_chomped_line_from_file(in)) != NULL) { e1 = s1; for (i=skip_fields ; i ; i--) { e1 = skip_whitespace(e1); while (*e1 && !isspace(*e1)) { ++e1; } } for (i = skip_chars ; *e1 && i ; i--) { ++e1; } if (!s0 || strcmp(e0, e1)) { break; } ++dups; /* Note: Testing for overflow seems excessive. */ } if (s0) { if (!(uniq_flags & (2 << !!dups))) { bb_fprintf(out, "\0%d " + (uniq_flags & 1), dups + 1); bb_fprintf(out, "%s\n", s0); } free((void *)s0); } } while (s1); xferror(in, input_filename); bb_fflush_stdout_and_exit(EXIT_SUCCESS); }