482f2b31e
Denis Vlasenko
2008-01-07
Subject
tac: *really* add tac.c now
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coreutils/tac.c+68 -0
| @@ -0,0 +1,68 @@ | |
| + | /* vi: set sw=4 ts=4: */ |
| + | /* |
| + | * tac implementation for busybox |
| + | * |
| + | * Copyright (C) 2003 Yang Xiaopeng <yxp at hanwang.com.cn> |
| + | * Copyright (C) 2007 Natanael Copa <[email protected]> |
| + | * Copyright (C) 2007 Tito Ragusa <[email protected]> |
| + | * |
| + | * Licensed under GPLv2, see file License in this tarball for details. |
| + | * |
| + | */ |
| + | |
| + | /* tac - concatenate and print files in reverse */ |
| + | |
| + | /* Based on Yang Xiaopeng's (yxp at hanwang.com.cn) patch |
| + | * http://www.uclibc.org/lists/busybox/2003-July/008813.html |
| + | */ |
| + | |
| + | #include "libbb.h" |
| + | |
| + | /* This is a NOEXEC applet. Be very careful! */ |
| + | |
| + | int tac_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| + | int tac_main(int argc, char **argv) |
| + | { |
| + | char **name; |
| + | FILE *f; |
| + | char *line; |
| + | llist_t *list = NULL; |
| + | int retval = EXIT_SUCCESS; |
| + | |
| + | argv++; |
| + | if (!*argv) |
| + | *--argv = (char *)"-"; |
| + | /* We will read from last file to first */ |
| + | name = argv; |
| + | while (*name) |
| + | name++; |
| + | |
| + | do { |
| + | name--; |
| + | f = fopen_or_warn_stdin(*name); |
| + | if (f == NULL) { |
| + | retval = EXIT_FAILURE; |
| + | continue; |
| + | } |
| + | |
| + | errno = 0; |
| + | /* FIXME: NUL bytes are mishandled. */ |
| + | while ((line = xmalloc_fgets(f)) != NULL) |
| + | llist_add_to(&list, line); |
| + | |
| + | /* xmalloc_fgets uses getc and returns NULL on error or EOF. */ |
| + | /* It sets errno to ENOENT on EOF, but fopen_or_warn_stdin would */ |
| + | /* catch this error so we can filter it out here. */ |
| + | if (errno && errno != ENOENT) { |
| + | bb_simple_perror_msg(*name); |
| + | retval = EXIT_FAILURE; |
| + | } |
| + | } while (name != argv); |
| + | |
| + | while (list) { |
| + | printf("%s", list->data); |
| + | list = list->link; |
| + | } |
| + | |
| + | return retval; |
| + | } |