69 lines
1.5 KiB
C
69 lines
1.5 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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int tac_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int tac_main(int argc, char **argv)
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{
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char **name;
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FILE *f;
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char *line;
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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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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 = 0;
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/* FIXME: NUL bytes are mishandled. */
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while ((line = xmalloc_fgets(f)) != NULL)
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llist_add_to(&list, line);
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/* xmalloc_fgets uses getc and returns NULL on error or EOF. */
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/* It sets errno to ENOENT on EOF, but fopen_or_warn_stdin would */
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/* catch this error 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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printf("%s", list->data);
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list = list->link;
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}
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return retval;
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}
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