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Vods versions of xargs
This commit is contained in:
Glenn L McGrath
parent
75a5684793
commit
61796945e3
@ -1,11 +1,13 @@
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/*
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* Mini xargs implementation for busybox
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* Only "-prt" options are supported in this version of xargs.
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* Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
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*
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* (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
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* (C) 2003 by Glenn McGrath <bug1@optushome.com.au>
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* (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Special thanks Mark Whitley for stimul to rewrote :)
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* Special thanks
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* - Mark Whitley and Glenn McGrath for stimul to rewrote :)
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* - Mike Rendell <michael@cs.mun.ca>
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* and David MacKenzie <djm@gnu.ai.mit.edu>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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@ -21,15 +23,6 @@
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* Reference:
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* http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
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*
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*
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* BUGS:
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* - E option doesnt allow spaces before argument
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* - exit value of isnt correct
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* - doesnt print quoted string properly
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*/
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#include <stdio.h>
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@ -38,25 +31,48 @@
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#include <unistd.h>
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#include <getopt.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "busybox.h"
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/* COMPAT: SYSV version defaults size (and has a max value of) to 470.
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We try to make it as large as possible. */
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#if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
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#define ARG_MAX sysconf (_SC_ARG_MAX)
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#endif
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#ifndef ARG_MAX
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#define ARG_MAX 470
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#endif
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#ifdef TEST
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# ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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# define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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# endif
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# ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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# define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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# endif
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# ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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# define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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# endif
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# ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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# define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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# endif
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#endif
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/*
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This function have special algorithm.
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Don`t use fork and include to main!
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*/
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static int xargs_exec(char **args)
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static int
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xargs_exec (char *const *args)
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{
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pid_t p;
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volatile int exec_errno; /* shared vfork stack */
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volatile int exec_errno = 0; /* shared vfork stack */
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exec_errno = 0;
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p = vfork();
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if (p < 0) {
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bb_perror_msg_and_die("vfork");
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} else if (p == 0) {
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if ((p = vfork ()) >= 0) {
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if (p == 0) {
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/* vfork -- child */
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execvp (args[0], args);
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exec_errno = errno; /* set error to shared stack */
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@ -65,89 +81,373 @@ static int xargs_exec(char **args)
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/* vfork -- parent */
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int status;
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while (wait(&status) == (pid_t) - 1) {
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if (errno != EINTR) {
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while (wait (&status) == (pid_t) - 1)
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if (errno != EINTR)
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break;
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}
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}
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if (exec_errno) {
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errno = exec_errno;
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bb_perror_msg ("%s", args[0]);
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return exec_errno == ENOENT ? 127 : 126;
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} else if (WEXITSTATUS(status) == 255) {
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} else {
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if (WEXITSTATUS (status) == 255) {
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bb_error_msg ("%s: exited with status 255; aborting", args[0]);
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return 124;
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} else if (WIFSTOPPED(status)) {
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}
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if (WIFSTOPPED (status)) {
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bb_error_msg ("%s: stopped by signal %d", args[0],
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WSTOPSIG (status));
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return 125;
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} else if (WIFSIGNALED(status)) {
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}
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if (WIFSIGNALED (status)) {
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bb_error_msg ("%s: terminated by signal %d", args[0],
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WTERMSIG (status));
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return 125;
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} else if (WEXITSTATUS(status)) {
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}
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if (WEXITSTATUS (status) != 0)
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return 123;
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} else {
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return 0;
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}
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}
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}
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#define OPT_VERBOSE 0x1
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#define OPT_TERMINATE 0x2
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#define OPT_UPTO_NUMBER 0x4
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#define OPT_UPTO_SIZE 0x8
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#define OPT_EOF_STRING 0x10
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int xargs_main(int argc, char **argv)
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{
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#ifdef CONFIG_FEATURE_XARGS_FANCY
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char *s_max_args = NULL;
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char *s_line_size = NULL;
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#endif
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char *eof_string = "_";
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unsigned long flg;
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int line_size;
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unsigned int max_args = LINE_MAX;
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char *line_buffer = NULL;
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char *line_buffer_ptr_ptr;
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char *old_arg = NULL;
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char **args;
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char *args_entry_ptr;
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int i;
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int a;
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#if 0
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/* Default to maximum line length */
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if (LINE_MAX > ARG_MAX - 2048) {
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/* Minimum command line length */
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line_size = LINE_MAX;
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} else {
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/* Maximum command line length */
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line_size = ARG_MAX = 2048;
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bb_perror_msg_and_die ("vfork");
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}
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}
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typedef struct xlist_s {
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char *data;
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size_t lenght;
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struct xlist_s *link;
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} xlist_t;
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static int eof_stdin_detected;
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#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
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#define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
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|| (c) == '\f' || (c) == '\v')
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
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static xlist_t *
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process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
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{
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#define NORM 0
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#define QUOTE 1
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#define BACKSLASH 2
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#define SPACE 4
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char *s = NULL; /* start word */
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char *p = NULL; /* pointer to end word */
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char q = 0; /* quote char */
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char state = NORM;
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char eof_str_detected = 0;
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size_t line_l = 0; /* size loaded args line */
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int c; /* current char */
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xlist_t *cur;
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xlist_t *prev;
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for(prev = cur = list_arg; cur; cur = cur->link) {
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line_l += cur->lenght; /* previous allocated */
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if(prev != cur)
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prev = prev->link;
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}
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while(!eof_stdin_detected) {
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c = getchar();
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if(c == EOF) {
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eof_stdin_detected++;
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if(s)
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goto unexpected_eof;
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break;
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}
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if(eof_str_detected)
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continue;
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if (state == BACKSLASH) {
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state = NORM;
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goto set;
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} else if (state == QUOTE) {
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if (c == q) {
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q = 0;
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state = NORM;
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} else {
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goto set;
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}
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} else /* if(state == NORM) */ {
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if (ISSPACE (c)) {
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if (s) {
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unexpected_eof:
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state = SPACE;
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c = 0;
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goto set;
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}
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} else {
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if (s == NULL)
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s = p = buf;
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if (c == '\\') {
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state = BACKSLASH;
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} else if (c == '\'' || c == '"') {
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q = c;
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state = QUOTE;
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} else {
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set:
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if( (p-buf) >= mc)
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bb_error_msg_and_die ("argument line too long");
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*p++ = c;
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}
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}
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}
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if (state == SPACE) { /* word's delimiter or EOF detected */
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if (q)
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bb_error_msg_and_die ("unmatched %s quote",
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q == '\'' ? "single" : "double");
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/* word loaded */
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if(eof_str) {
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eof_str_detected = strcmp(s, eof_str) == 0;
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}
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if(!eof_str_detected) {
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size_t lenght = (p-buf);
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cur = xmalloc(sizeof(xlist_t) + lenght);
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cur->data = memcpy(cur + 1, s, lenght);
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cur->lenght = lenght;
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cur->link = NULL;
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if(prev == NULL) {
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list_arg = cur;
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} else {
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prev->link = cur;
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}
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prev = cur;
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line_l += lenght;
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if(line_l > mc) {
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/* stop memory usage :-) */
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break;
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}
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}
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s = NULL;
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state = NORM;
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}
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}
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return list_arg;
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}
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#else
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line_size = LINE_MAX;
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#endif
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/* The variant is unsupport single, double quotes and backslash */
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static xlist_t *
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process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
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{
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#ifndef CONFIG_FEATURE_XARGS_FANCY
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flg = bb_getopt_ulflags(argc, argv, "+t");
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int c; /* current char */
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int eof_str_detected = 0;
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char *s = NULL; /* start word */
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char *p = NULL; /* pointer to end word */
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size_t line_l = 0; /* size loaded args line */
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xlist_t *cur;
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xlist_t *prev;
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for(prev = cur = list_arg; cur; cur = cur->link) {
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line_l += cur->lenght; /* previous allocated */
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if(prev != cur)
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prev = prev->link;
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}
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while(!eof_stdin_detected) {
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c = getchar();
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if(c == EOF) {
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eof_stdin_detected++;
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}
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if(eof_str_detected)
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continue;
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if (c == EOF || ISSPACE (c)) {
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if(s == NULL)
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continue;
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c = EOF;
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}
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if (s == NULL)
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s = p = buf;
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if( (p-buf) >= mc)
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bb_error_msg_and_die ("argument line too long");
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*p++ = c == EOF ? 0 : c;
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if (c == EOF) { /* word's delimiter or EOF detected */
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/* word loaded */
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if(eof_str) {
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eof_str_detected = strcmp(s, eof_str) == 0;
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}
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if(!eof_str_detected) {
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size_t lenght = (p-buf);
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cur = xmalloc(sizeof(xlist_t) + lenght);
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cur->data = memcpy(cur + 1, s, lenght);
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cur->lenght = lenght;
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cur->link = NULL;
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if(prev == NULL) {
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list_arg = cur;
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} else {
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prev->link = cur;
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}
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prev = cur;
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line_l += lenght;
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if(line_l > mc) {
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/* stop memory usage :-) */
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break;
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}
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s = NULL;
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}
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}
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}
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return list_arg;
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}
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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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/* Prompt the user for a response, and
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if the user responds affirmatively, return true;
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otherwise, return false. Used "/dev/tty", not stdin. */
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static int
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xargs_ask_confirmation (void)
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{
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static FILE *tty_stream;
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int c, savec;
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if (!tty_stream) {
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tty_stream = fopen ("/dev/tty", "r");
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if (!tty_stream)
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bb_perror_msg_and_die ("/dev/tty");
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/* pranoidal security by vodz */
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fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
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}
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fputs (" ?...", stderr);
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fflush (stderr);
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c = savec = getc (tty_stream);
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while (c != EOF && c != '\n')
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c = getc (tty_stream);
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if (savec == 'y' || savec == 'Y')
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return 1;
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return 0;
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}
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# define OPT_INC_P 1
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#else
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flg = bb_getopt_ulflags(argc, argv, "+txn:s:E::", &s_max_args, &s_line_size, &eof_string);
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# define OPT_INC_P 0
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# define xargs_ask_confirmation() 1
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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
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if (s_line_size) {
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line_size = bb_xgetularg10_bnd(s_max_args, 1, line_size);
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}
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if (s_max_args) {
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max_args = bb_xgetularg10(s_max_args);
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}
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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# define OPT_INC_X 1
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#else
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# define OPT_INC_X 0
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#endif
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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static xlist_t *
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process0_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
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{
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int c; /* current char */
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char *s = NULL; /* start word */
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char *p = NULL; /* pointer to end word */
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size_t line_l = 0; /* size loaded args line */
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xlist_t *cur;
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xlist_t *prev;
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for(prev = cur = list_arg; cur; cur = cur->link) {
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line_l += cur->lenght; /* previous allocated */
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if(prev != cur)
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prev = prev->link;
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}
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while(!eof_stdin_detected) {
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c = getchar();
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if(c == EOF) {
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eof_stdin_detected++;
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if(s == NULL)
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break;
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c = 0;
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}
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if (s == NULL)
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s = p = buf;
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if( (p-buf) >= mc)
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bb_error_msg_and_die ("argument line too long");
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*p++ = c;
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if (c == 0) { /* word's delimiter or EOF detected */
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/* word loaded */
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size_t lenght = (p-buf);
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cur = xmalloc(sizeof(xlist_t) + lenght);
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cur->data = memcpy(cur + 1, s, lenght);
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cur->lenght = lenght;
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cur->link = NULL;
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if(prev == NULL) {
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list_arg = cur;
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} else {
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prev->link = cur;
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}
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prev = cur;
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line_l += lenght;
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if(line_l > mc) {
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/* stop memory usage :-) */
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break;
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}
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s = NULL;
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}
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}
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return list_arg;
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}
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# define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
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# define OPT_INC_0 1 /* future use */
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#else
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# define OPT_INC_0 0 /* future use */
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# define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
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|
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#define OPT_VERBOSE (1<<0)
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#define OPT_NO_EMPTY (1<<1)
|
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#define OPT_UPTO_NUMBER (1<<2)
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#define OPT_UPTO_SIZE (1<<3)
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#define OPT_EOF_STRING (1<<4)
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
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#define OPT_INTERACTIVE (1<<5)
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#else
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#define OPT_INTERACTIVE (0) /* require for algorithm &| */
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#endif
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#define OPT_TERMINATE (1<<(5+OPT_INC_P))
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#define OPT_ZEROTERM (1<<(5+OPT_INC_P+OPT_INC_X))
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/* next future
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#define OPT_NEXT_OTHER (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
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*/
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int
|
||||
xargs_main (int argc, char **argv)
|
||||
{
|
||||
char **args;
|
||||
int i, a, n;
|
||||
xlist_t *list = NULL;
|
||||
xlist_t *cur;
|
||||
int child_error = 0;
|
||||
char *max_args, *max_chars;
|
||||
int n_max_arg;
|
||||
size_t n_chars = 0;
|
||||
long orig_arg_max;
|
||||
const char *eof_str = "_";
|
||||
unsigned long opt;
|
||||
size_t n_max_chars;
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
||||
xlist_t * (*read_args) (xlist_t *, const char *, size_t, char *) = process_stdin;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
|
||||
bb_opt_complementaly = "pt";
|
||||
#endif
|
||||
|
||||
opt = bb_getopt_ulflags (argc, argv, "+trn:s:e::"
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
|
||||
"p"
|
||||
#endif
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
|
||||
"x"
|
||||
#endif
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
||||
"0"
|
||||
#endif
|
||||
, &max_args, &max_chars, &eof_str);
|
||||
|
||||
a = argc - optind;
|
||||
argv += optind;
|
||||
if (a == 0) {
|
||||
@ -155,107 +455,126 @@ int xargs_main(int argc, char **argv)
|
||||
*argv = "echo";
|
||||
a++;
|
||||
}
|
||||
/* allocating pointers for execvp: a*arg, arg from stdin, NULL */
|
||||
args = xcalloc(a + 2, sizeof(char *));
|
||||
|
||||
/* Store the command to be executed (taken from the command line) */
|
||||
orig_arg_max = ARG_MAX;
|
||||
if (orig_arg_max == -1)
|
||||
orig_arg_max = LONG_MAX;
|
||||
orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048. */
|
||||
if ((opt & OPT_UPTO_SIZE)) {
|
||||
n_max_chars = bb_xgetularg10_bnd (max_chars, 1, orig_arg_max);
|
||||
for (i = 0; i < a; i++) {
|
||||
line_size -= strlen(*argv) + 1;
|
||||
args[i] = *argv++;
|
||||
n_chars += strlen (*argv) + 1;
|
||||
}
|
||||
if (line_size < 1) {
|
||||
bb_error_msg_and_die("can not fit single argument within argument list size limit");
|
||||
if (n_max_chars < n_chars) {
|
||||
bb_error_msg_and_die
|
||||
("can not fit single argument within argument list size limit");
|
||||
}
|
||||
|
||||
args[i] = xmalloc(line_size);
|
||||
args_entry_ptr = args[i];
|
||||
|
||||
/* Now, read in one line at a time from stdin, and store this
|
||||
* line to be used later as an argument to the command */
|
||||
do {
|
||||
char *line_buffer_ptr = NULL;
|
||||
unsigned int arg_count = 0;
|
||||
unsigned int arg_size = 0;
|
||||
|
||||
*args_entry_ptr = '\0';
|
||||
|
||||
/* Get the required number of entries from stdin */
|
||||
do {
|
||||
/* (Re)fill the line buffer */
|
||||
if (line_buffer == NULL) {
|
||||
line_buffer = bb_get_chomped_line_from_file(stdin);
|
||||
if (line_buffer == NULL) {
|
||||
/* EOF, exit outer loop */
|
||||
break;
|
||||
}
|
||||
line_buffer_ptr =
|
||||
strtok_r(line_buffer, " \t", &line_buffer_ptr_ptr);
|
||||
n_max_chars -= n_chars;
|
||||
} else {
|
||||
if (old_arg) {
|
||||
line_buffer_ptr = old_arg;
|
||||
old_arg = NULL;
|
||||
/* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
|
||||
have it at 1 meg). Things will work fine with a large ARG_MAX but it
|
||||
will probably hurt the system more than it needs to; an array of this
|
||||
size is allocated. */
|
||||
if (orig_arg_max > 20 * 1024)
|
||||
orig_arg_max = 20 * 1024;
|
||||
n_max_chars = orig_arg_max;
|
||||
}
|
||||
max_chars = xmalloc(n_max_chars);
|
||||
|
||||
if ((opt & OPT_UPTO_NUMBER)) {
|
||||
n_max_arg = bb_xgetularg10_bnd (max_args, 1, INT_MAX);
|
||||
} else {
|
||||
line_buffer_ptr =
|
||||
strtok_r(NULL, " \t", &line_buffer_ptr_ptr);
|
||||
}
|
||||
}
|
||||
/* If no arguments left go back and get another line */
|
||||
if (line_buffer_ptr == NULL) {
|
||||
free(line_buffer);
|
||||
line_buffer = NULL;
|
||||
continue;
|
||||
n_max_arg = n_max_chars;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_FEATURE_XARGS_FANCY
|
||||
if (eof_string && (strcmp(line_buffer_ptr, eof_string) == 0)) {
|
||||
#else
|
||||
if (strcmp(line_buffer_ptr, eof_string) == 0) {
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
||||
if(opt & OPT_ZEROTERM)
|
||||
read_args = process0_stdin;
|
||||
#endif
|
||||
/* logical EOF, exit outer loop */
|
||||
line_buffer = NULL;
|
||||
|
||||
while ((list = READ_ARGS(list, eof_str, n_max_chars, max_chars)) != NULL
|
||||
|| (opt & OPT_NO_EMPTY) == 0) {
|
||||
opt |= OPT_NO_EMPTY;
|
||||
n = 0;
|
||||
n_chars = 0;
|
||||
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
|
||||
for (cur = list; cur; ) {
|
||||
n_chars += cur->lenght;
|
||||
n++;
|
||||
cur = cur->link;
|
||||
if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
|
||||
if (opt & OPT_TERMINATE)
|
||||
bb_error_msg_and_die ("argument list too long");
|
||||
break;
|
||||
}
|
||||
|
||||
/* Check the next argument will fit */
|
||||
arg_size += 1 + strlen(line_buffer_ptr);
|
||||
if (arg_size > line_size) {
|
||||
if ((arg_count == 0)
|
||||
#ifdef CONFIG_FEATURE_XARGS_FANCY
|
||||
|| ((flg & OPT_TERMINATE) && (arg_count != max_args))) {
|
||||
#else
|
||||
) {
|
||||
#endif
|
||||
bb_error_msg_and_die("argument line too long");
|
||||
}
|
||||
old_arg = line_buffer_ptr;
|
||||
#else
|
||||
for (cur = list; cur; cur = cur->link) {
|
||||
n_chars += cur->lenght;
|
||||
n++;
|
||||
if (n_chars > n_max_chars || n == n_max_arg) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
|
||||
|
||||
/* Add the entry to our pre-allocated space */
|
||||
strcat(args_entry_ptr, line_buffer_ptr);
|
||||
strcat(args_entry_ptr, " ");
|
||||
arg_count++;
|
||||
} while (arg_count < max_args);
|
||||
/* allocating pointers for execvp:
|
||||
a*arg, n*arg from stdin, NULL */
|
||||
args = xcalloc (n + a + 1, sizeof (char *));
|
||||
|
||||
/* Remove the last space */
|
||||
args_entry_ptr[arg_size - 1] = '\0';
|
||||
/* Store the command to be executed
|
||||
(taken from the command line) */
|
||||
for (i = 0; i < a; i++)
|
||||
args[i] = argv[i];
|
||||
/* (taken from stdin) */
|
||||
for (cur = list; n; cur = cur->link) {
|
||||
args[i++] = cur->data;
|
||||
n--;
|
||||
}
|
||||
|
||||
if (*args_entry_ptr != '\0') {
|
||||
if (flg & OPT_VERBOSE) {
|
||||
if ((opt & (OPT_INTERACTIVE|OPT_VERBOSE))) {
|
||||
for (i = 0; args[i]; i++) {
|
||||
if (i) {
|
||||
if (i)
|
||||
fputc (' ', stderr);
|
||||
}
|
||||
fputs (args[i], stderr);
|
||||
}
|
||||
if((opt & OPT_INTERACTIVE) == 0)
|
||||
fputc ('\n', stderr);
|
||||
}
|
||||
xargs_exec(args);
|
||||
if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation () != 0) {
|
||||
child_error = xargs_exec (args);
|
||||
}
|
||||
} while (line_buffer);
|
||||
|
||||
#ifdef CONFIG_FEATURE_CLEAN_UP
|
||||
free(args);
|
||||
#endif
|
||||
return 0;
|
||||
/* clean up */
|
||||
for (i = a; args[i]; i++) {
|
||||
cur = list;
|
||||
list = list->link;
|
||||
free (cur);
|
||||
}
|
||||
free (args);
|
||||
if (child_error > 0 && child_error != 123) {
|
||||
break;
|
||||
}
|
||||
}
|
||||
#ifdef CONFIG_FEATURE_CLEAN_UP
|
||||
free(max_chars);
|
||||
#endif
|
||||
return child_error;
|
||||
}
|
||||
|
||||
|
||||
#ifdef TEST
|
||||
|
||||
const char *bb_applet_name = "debug stuff usage";
|
||||
|
||||
void bb_show_usage(void)
|
||||
{
|
||||
fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n", bb_applet_name);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
return xargs_main(argc, argv);
|
||||
}
|
||||
#endif /* TEST */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user