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Vods versions of xargs

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This commit is contained in:
Glenn L McGrath 2003-10-10 12:10:18 +00:00
parent 75a5684793
commit 61796945e3
1 changed files with 527 additions and 208 deletions
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735
findutils/xargs.c
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@ -1,11 +1,13 @@
/*
* Mini xargs implementation for busybox
* Only "-prt" options are supported in this version of xargs.
* Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
*
* (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru>
* (C) 2003 by Glenn McGrath <bug1@optushome.com.au>
* (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
*
* Special thanks Mark Whitley for stimul to rewrote :)
* Special thanks
* - Mark Whitley and Glenn McGrath for stimul to rewrote :)
* - Mike Rendell <michael@cs.mun.ca>
* and David MacKenzie <djm@gnu.ai.mit.edu>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -21,15 +23,6 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*
* Reference:
* http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
*
*
* BUGS:
* - E option doesnt allow spaces before argument
* - exit value of isnt correct
* - doesnt print quoted string properly
*/
#include <stdio.h>
@ -38,224 +31,550 @@
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "busybox.h"
/* COMPAT: SYSV version defaults size (and has a max value of) to 470.
We try to make it as large as possible. */
#if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
#define ARG_MAX sysconf (_SC_ARG_MAX)
#endif
#ifndef ARG_MAX
#define ARG_MAX 470
#endif
#ifdef TEST
# ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
# define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
# endif
# ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
# define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
# endif
# ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
# define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
# endif
# ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
# define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
# endif
#endif
/*
This function have special algorithm.
Don`t use fork and include to main!
*/
static int xargs_exec(char **args)
static int
xargs_exec (char *const *args)
{
pid_t p;
volatile int exec_errno; /* shared vfork stack */
exec_errno = 0;
p = vfork();
if (p < 0) {
bb_perror_msg_and_die("vfork");
} else if (p == 0) {
/* vfork -- child */
execvp(args[0], args);
exec_errno = errno; /* set error to shared stack */
_exit(1);
pid_t p;
volatile int exec_errno = 0; /* shared vfork stack */
if ((p = vfork ()) >= 0) {
if (p == 0) {
/* vfork -- child */
execvp (args[0], args);
exec_errno = errno; /* set error to shared stack */
_exit (1);
} else {
/* vfork -- parent */
int status;
/* vfork -- parent */
int status;
while (wait(&status) == (pid_t) - 1) {
if (errno != EINTR) {
break;
}
while (wait (&status) == (pid_t) - 1)
if (errno != EINTR)
break;
if (exec_errno) {
errno = exec_errno;
bb_perror_msg ("%s", args[0]);
return exec_errno == ENOENT ? 127 : 126;
} else {
if (WEXITSTATUS (status) == 255) {
bb_error_msg ("%s: exited with status 255; aborting", args[0]);
return 124;
}
if (WIFSTOPPED (status)) {
bb_error_msg ("%s: stopped by signal %d", args[0],
WSTOPSIG (status));
return 125;
}
if (WIFSIGNALED (status)) {
bb_error_msg ("%s: terminated by signal %d", args[0],
WTERMSIG (status));
return 125;
}
if (WEXITSTATUS (status) != 0)
return 123;
return 0;
}
}
} else {
bb_perror_msg_and_die ("vfork");
}
}
if (exec_errno) {
errno = exec_errno;
bb_perror_msg("%s", args[0]);
return exec_errno == ENOENT ? 127 : 126;
} else if (WEXITSTATUS(status) == 255) {
bb_error_msg("%s: exited with status 255; aborting", args[0]);
return 124;
} else if (WIFSTOPPED(status)) {
bb_error_msg("%s: stopped by signal %d", args[0],
WSTOPSIG(status));
return 125;
} else if (WIFSIGNALED(status)) {
bb_error_msg("%s: terminated by signal %d", args[0],
WTERMSIG(status));
return 125;
} else if (WEXITSTATUS(status)) {
return 123;
typedef struct xlist_s {
char *data;
size_t lenght;
struct xlist_s *link;
} xlist_t;
static int eof_stdin_detected;
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
|| (c) == '\f' || (c) == '\v')
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
static xlist_t *
process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
{
#define NORM 0
#define QUOTE 1
#define BACKSLASH 2
#define SPACE 4
char *s = NULL; /* start word */
char *p = NULL; /* pointer to end word */
char q = 0; /* quote char */
char state = NORM;
char eof_str_detected = 0;
size_t line_l = 0; /* size loaded args line */
int c; /* current char */
xlist_t *cur;
xlist_t *prev;
for(prev = cur = list_arg; cur; cur = cur->link) {
line_l += cur->lenght; /* previous allocated */
if(prev != cur)
prev = prev->link;
}
while(!eof_stdin_detected) {
c = getchar();
if(c == EOF) {
eof_stdin_detected++;
if(s)
goto unexpected_eof;
break;
}
if(eof_str_detected)
continue;
if (state == BACKSLASH) {
state = NORM;
goto set;
} else if (state == QUOTE) {
if (c == q) {
q = 0;
state = NORM;
} else {
goto set;
}
} else /* if(state == NORM) */ {
if (ISSPACE (c)) {
if (s) {
unexpected_eof:
state = SPACE;
c = 0;
goto set;
}
} else {
if (s == NULL)
s = p = buf;
if (c == '\\') {
state = BACKSLASH;
} else if (c == '\'' || c == '"') {
q = c;
state = QUOTE;
} else {
return 0;
set:
if( (p-buf) >= mc)
bb_error_msg_and_die ("argument line too long");
*p++ = c;
}
}
}
if (state == SPACE) { /* word's delimiter or EOF detected */
if (q)
bb_error_msg_and_die ("unmatched %s quote",
q == '\'' ? "single" : "double");
/* word loaded */
if(eof_str) {
eof_str_detected = strcmp(s, eof_str) == 0;
}
if(!eof_str_detected) {
size_t lenght = (p-buf);
cur = xmalloc(sizeof(xlist_t) + lenght);
cur->data = memcpy(cur + 1, s, lenght);
cur->lenght = lenght;
cur->link = NULL;
if(prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
prev = cur;
line_l += lenght;
if(line_l > mc) {
/* stop memory usage :-) */
break;
}
}
s = NULL;
state = NORM;
}
}
return list_arg;
}
#define OPT_VERBOSE 0x1
#define OPT_TERMINATE 0x2
#define OPT_UPTO_NUMBER 0x4
#define OPT_UPTO_SIZE 0x8
#define OPT_EOF_STRING 0x10
int xargs_main(int argc, char **argv)
#else
/* The variant is unsupport single, double quotes and backslash */
static xlist_t *
process_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
{
#ifdef CONFIG_FEATURE_XARGS_FANCY
char *s_max_args = NULL;
char *s_line_size = NULL;
#endif
char *eof_string = "_";
unsigned long flg;
int line_size;
unsigned int max_args = LINE_MAX;
int c; /* current char */
int eof_str_detected = 0;
char *s = NULL; /* start word */
char *p = NULL; /* pointer to end word */
size_t line_l = 0; /* size loaded args line */
xlist_t *cur;
xlist_t *prev;
char *line_buffer = NULL;
char *line_buffer_ptr_ptr;
char *old_arg = NULL;
for(prev = cur = list_arg; cur; cur = cur->link) {
line_l += cur->lenght; /* previous allocated */
if(prev != cur)
prev = prev->link;
}
char **args;
char *args_entry_ptr;
int i;
int a;
#if 0
/* Default to maximum line length */
if (LINE_MAX > ARG_MAX - 2048) {
/* Minimum command line length */
line_size = LINE_MAX;
} else {
/* Maximum command line length */
line_size = ARG_MAX = 2048;
while(!eof_stdin_detected) {
c = getchar();
if(c == EOF) {
eof_stdin_detected++;
}
#else
line_size = LINE_MAX;
#endif
#ifndef CONFIG_FEATURE_XARGS_FANCY
flg = bb_getopt_ulflags(argc, argv, "+t");
#else
flg = bb_getopt_ulflags(argc, argv, "+txn:s:E::", &s_max_args, &s_line_size, &eof_string);
if (s_line_size) {
line_size = bb_xgetularg10_bnd(s_max_args, 1, line_size);
if(eof_str_detected)
continue;
if (c == EOF || ISSPACE (c)) {
if(s == NULL)
continue;
c = EOF;
}
if (s_max_args) {
max_args = bb_xgetularg10(s_max_args);
}
#endif
if (s == NULL)
s = p = buf;
if( (p-buf) >= mc)
bb_error_msg_and_die ("argument line too long");
*p++ = c == EOF ? 0 : c;
if (c == EOF) { /* word's delimiter or EOF detected */
/* word loaded */
if(eof_str) {
eof_str_detected = strcmp(s, eof_str) == 0;
}
if(!eof_str_detected) {
size_t lenght = (p-buf);
a = argc - optind;
argv += optind;
if (a == 0) {
/* default behavior is to echo all the filenames */
*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) */
for (i = 0; i < a; i++) {
line_size -= strlen(*argv) + 1;
args[i] = *argv++;
}
if (line_size < 1) {
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);
} else {
if (old_arg) {
line_buffer_ptr = old_arg;
old_arg = NULL;
} 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;
}
#ifdef CONFIG_FEATURE_XARGS_FANCY
if (eof_string && (strcmp(line_buffer_ptr, eof_string) == 0)) {
#else
if (strcmp(line_buffer_ptr, eof_string) == 0) {
#endif
/* logical EOF, exit outer loop */
line_buffer = NULL;
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;
break;
}
/* 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);
/* Remove the last space */
args_entry_ptr[arg_size - 1] = '\0';
if (*args_entry_ptr != '\0') {
if (flg & OPT_VERBOSE) {
for (i = 0; args[i]; i++) {
if (i) {
fputc(' ', stderr);
}
fputs(args[i], stderr);
}
fputc('\n', stderr);
}
xargs_exec(args);
cur = xmalloc(sizeof(xlist_t) + lenght);
cur->data = memcpy(cur + 1, s, lenght);
cur->lenght = lenght;
cur->link = NULL;
if(prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
} while (line_buffer);
#ifdef CONFIG_FEATURE_CLEAN_UP
free(args);
#endif
return 0;
prev = cur;
line_l += lenght;
if(line_l > mc) {
/* stop memory usage :-) */
break;
}
s = NULL;
}
}
}
return list_arg;
}
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
/* Prompt the user for a response, and
if the user responds affirmatively, return true;
otherwise, return false. Used "/dev/tty", not stdin. */
static int
xargs_ask_confirmation (void)
{
static FILE *tty_stream;
int c, savec;
if (!tty_stream) {
tty_stream = fopen ("/dev/tty", "r");
if (!tty_stream)
bb_perror_msg_and_die ("/dev/tty");
/* pranoidal security by vodz */
fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
}
fputs (" ?...", stderr);
fflush (stderr);
c = savec = getc (tty_stream);
while (c != EOF && c != '\n')
c = getc (tty_stream);
if (savec == 'y' || savec == 'Y')
return 1;
return 0;
}
# define OPT_INC_P 1
#else
# define OPT_INC_P 0
# define xargs_ask_confirmation() 1
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
# define OPT_INC_X 1
#else
# define OPT_INC_X 0
#endif
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
static xlist_t *
process0_stdin (xlist_t *list_arg, const char *eof_str, size_t mc, char *buf)
{
int c; /* current char */
char *s = NULL; /* start word */
char *p = NULL; /* pointer to end word */
size_t line_l = 0; /* size loaded args line */
xlist_t *cur;
xlist_t *prev;
for(prev = cur = list_arg; cur; cur = cur->link) {
line_l += cur->lenght; /* previous allocated */
if(prev != cur)
prev = prev->link;
}
while(!eof_stdin_detected) {
c = getchar();
if(c == EOF) {
eof_stdin_detected++;
if(s == NULL)
break;
c = 0;
}
if (s == NULL)
s = p = buf;
if( (p-buf) >= mc)
bb_error_msg_and_die ("argument line too long");
*p++ = c;
if (c == 0) { /* word's delimiter or EOF detected */
/* word loaded */
size_t lenght = (p-buf);
cur = xmalloc(sizeof(xlist_t) + lenght);
cur->data = memcpy(cur + 1, s, lenght);
cur->lenght = lenght;
cur->link = NULL;
if(prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
prev = cur;
line_l += lenght;
if(line_l > mc) {
/* stop memory usage :-) */
break;
}
s = NULL;
}
}
return list_arg;
}
# define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
# define OPT_INC_0 1 /* future use */
#else
# define OPT_INC_0 0 /* future use */
# define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
#define OPT_VERBOSE (1<<0)
#define OPT_NO_EMPTY (1<<1)
#define OPT_UPTO_NUMBER (1<<2)
#define OPT_UPTO_SIZE (1<<3)
#define OPT_EOF_STRING (1<<4)
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
#define OPT_INTERACTIVE (1<<5)
#else
#define OPT_INTERACTIVE (0) /* require for algorithm &| */
#endif
#define OPT_TERMINATE (1<<(5+OPT_INC_P))
#define OPT_ZEROTERM (1<<(5+OPT_INC_P+OPT_INC_X))
/* next future
#define OPT_NEXT_OTHER (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
*/
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) {
/* default behavior is to echo all the filenames */
*argv = "echo";
a++;
}
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++) {
n_chars += strlen (*argv) + 1;
}
if (n_max_chars < n_chars) {
bb_error_msg_and_die
("can not fit single argument within argument list size limit");
}
n_max_chars -= n_chars;
} else {
/* 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 {
n_max_arg = n_max_chars;
}
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
if(opt & OPT_ZEROTERM)
read_args = process0_stdin;
#endif
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;
}
}
#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 */
/* allocating pointers for execvp:
a*arg, n*arg from stdin, NULL */
args = xcalloc (n + a + 1, sizeof (char *));
/* 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 ((opt & (OPT_INTERACTIVE|OPT_VERBOSE))) {
for (i = 0; args[i]; i++) {
if (i)
fputc (' ', stderr);
fputs (args[i], stderr);
}
if((opt & OPT_INTERACTIVE) == 0)
fputc ('\n', stderr);
}
if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation () != 0) {
child_error = xargs_exec (args);
}
/* 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 */