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68404f13d4
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
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tac implementation for busybox
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*
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* Copyright (C) 2003 Yang Xiaopeng <yxp at hanwang.com.cn>
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* Copyright (C) 2007 Natanael Copa <natanael.copa@gmail.com>
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* Copyright (C) 2007 Tito Ragusa <farmatito@tiscali.it>
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*
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* Licensed under GPLv2, see file License in this tarball for details.
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*
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*/
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/* tac - concatenate and print files in reverse */
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/* Based on Yang Xiaopeng's (yxp at hanwang.com.cn) patch
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* http://www.uclibc.org/lists/busybox/2003-July/008813.html
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*/
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#include "libbb.h"
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/* This is a NOEXEC applet. Be very careful! */
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struct lstring {
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int size;
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char buf[];
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};
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int tac_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tac_main(int argc ATTRIBUTE_UNUSED, char **argv)
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{
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char **name;
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FILE *f;
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struct lstring *line = NULL;
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llist_t *list = NULL;
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int retval = EXIT_SUCCESS;
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argv++;
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if (!*argv)
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*--argv = (char *)"-";
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/* We will read from last file to first */
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name = argv;
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while (*name)
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name++;
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do {
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int ch, i;
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name--;
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f = fopen_or_warn_stdin(*name);
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if (f == NULL) {
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retval = EXIT_FAILURE;
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continue;
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}
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errno = i = 0;
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do {
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ch = fgetc(f);
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if (ch != EOF) {
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if (!(i & 0x7f))
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/* Grow on every 128th char */
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line = xrealloc(line, i + 0x7f + sizeof(int) + 1);
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line->buf[i++] = ch;
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}
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if ((ch == '\n' || ch == EOF) && i) {
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line = xrealloc(line, i + sizeof(int));
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line->size = i;
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llist_add_to(&list, line);
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line = NULL;
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i = 0;
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}
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} while (ch != EOF);
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/* fgetc sets errno to ENOENT on EOF, but */
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/* fopen_or_warn_stdin would catch this error */
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/* so we can filter it out here. */
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if (errno && errno != ENOENT) {
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bb_simple_perror_msg(*name);
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retval = EXIT_FAILURE;
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}
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} while (name != argv);
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while (list) {
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line = (struct lstring *)list->data;
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xwrite(STDOUT_FILENO, line->buf, line->size);
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if (ENABLE_FEATURE_CLEAN_UP) {
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free(llist_pop(&list));
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} else {
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list = list->link;
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}
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}
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return retval;
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}
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