busybox/coreutils/uniq.c
Denis Vlasenko 68404f13d4 *: add -Wunused-parameter; fix resulting breakage
function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped
2008-03-17 09:00:54 +00:00

104 lines
2.0 KiB
C

/* 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 "libbb.h"
static const char uniq_opts[] ALIGN1 = "cdu" "f:s:" "cdu\0\1\2\4";
static FILE *xgetoptfile_uniq_s(char **argv, int read0write2)
{
const char *n;
n = *argv;
if (n != NULL) {
if ((*n != '-') || n[1]) {
return xfopen(n, "r\0w" + read0write2);
}
}
return (read0write2) ? stdout : stdin;
}
int uniq_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int uniq_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
FILE *in, *out;
unsigned long dups, skip_fields, skip_chars, i;
const char *s0, *e0, *s1, *e1, *input_filename;
unsigned opt;
enum {
OPT_c = 0x1,
OPT_d = 0x2,
OPT_u = 0x4,
OPT_f = 0x8,
OPT_s = 0x10,
};
skip_fields = skip_chars = 0;
opt = getopt32(argv, "cduf:s:", &s0, &s1);
if (opt & OPT_f)
skip_fields = xatoul(s0);
if (opt & OPT_s)
skip_chars = xatoul(s1);
argv += optind;
input_filename = *argv;
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 = xmalloc_getline(in)) != NULL) {
e1 = s1;
for (i = skip_fields; i; i--) {
e1 = skip_whitespace(e1);
e1 = skip_non_whitespace(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 (!(opt & (OPT_d << !!dups))) { /* (if dups, opt & OPT_e) */
fprintf(out, "\0%d " + (opt & 1), dups + 1);
fprintf(out, "%s\n", s0);
}
free((void *)s0);
}
} while (s1);
die_if_ferror(in, input_filename);
fflush_stdout_and_exit(EXIT_SUCCESS);
}