/* vi: set sw=4 ts=4: */
/*
* Mini xargs implementation for busybox
+ * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
*
- * Copyright (C) 2000 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
+ * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
*
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Special thanks
+ * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
+ * - Mike Rendell <michael@cs.mun.ca>
+ * and David MacKenzie <djm@gnu.ai.mit.edu>.
*
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * xargs is described in the Single Unix Specification v3 at
+ * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
*
*/
-#include "internal.h"
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <getopt.h>
-#include <ctype.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
-int xargs_main(int argc, char **argv)
+
+#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 has special algorithm.
+ Don't use fork and include to main!
+*/
+static int xargs_exec(char *const *args)
+{
+ pid_t p;
+ volatile int exec_errno = 0; /* shared vfork stack */
+ int status;
+
+ p = vfork();
+ if (p < 0)
+ bb_perror_msg_and_die("vfork");
+
+ if (p == 0) {
+ /* vfork -- child */
+ execvp(args[0], args);
+ exec_errno = errno; /* set error to shared stack */
+ _exit(1);
+ }
+
+ /* vfork -- parent */
+ 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;
+ }
+ 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))
+ return 123;
+ return 0;
+}
+
+
+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)
{
- char *in_from_stdin = NULL;
- char *args = NULL;
- char *cmd_to_be_executed = NULL;
- char traceflag = 0;
- int len_args=10, len_cmd_to_be_executed, opt;
- pid_t pid;
- int wpid, status;
-
- /* Note that we do not use getopt here, since
- * we only want to interpret initial options,
- * not options passed to commands */
- while (--argc && **(++argv) == '-') {
- while (*++(*argv)) {
- switch (**argv) {
- case 't':
- traceflag=1;
+#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 {
+set:
+ if ((size_t)(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;
- default:
- fatalError(xargs_usage);
+ }
}
+ s = NULL;
+ state = NORM;
}
}
+ return list_arg;
+}
+#else
+/* The variant does not support single quotes, double quotes or backslash */
+static xlist_t *process_stdin(xlist_t * list_arg,
+ const char *eof_str, size_t mc, char *buf)
+{
- /* Store the command to be executed (taken from the command line) */
- if (argc == 0) {
- len_cmd_to_be_executed=6;
- cmd_to_be_executed = xmalloc(len_cmd_to_be_executed);
- strcat(cmd_to_be_executed, "echo");
- } else {
- opt=strlen(*argv);
- len_cmd_to_be_executed = (opt > 10)? opt : 10;
- cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char));
- strcat(cmd_to_be_executed, *argv);
+ 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;
+
+ 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 (eof_str_detected)
+ continue;
+ if (c == EOF || ISSPACE(c)) {
+ if (s == NULL)
+ continue;
+ c = EOF;
+ }
+ 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);
- /* Now, read in one line at a time from stdin, and stroe this to be used later
- * as an argument to the command we just stored */
- in_from_stdin = get_line_from_file(stdin);
- for (;in_from_stdin!=NULL;) {
- char *tmp;
- opt = strlen(in_from_stdin);
- len_args += opt + 3;
- args=xrealloc(args, len_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;
+ }
+ prev = cur;
+ line_l += lenght;
+ if (line_l > mc) {
+ /* stop memory usage :-) */
+ break;
+ }
+ s = NULL;
+ }
+ }
+ }
+ return list_arg;
+}
+#endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
- /* Strip out the final \n */
- in_from_stdin[opt-1]=' ';
- /* Replace any tabs with spaces */
- while( (tmp = strchr(in_from_stdin, '\t')) != NULL )
- *tmp=' ';
+#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 = xfopen(CURRENT_TTY, "r");
+ /* 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;
+}
+#else
+# define xargs_ask_confirmation() 1
+#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
+
+#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED,
+ 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;
- /* Strip out any extra intra-word spaces */
- while( (tmp = strstr(in_from_stdin, " ")) != NULL ) {
- opt = strlen(in_from_stdin);
- memmove(tmp, tmp+1, opt-(tmp-in_from_stdin));
+ 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 ((size_t)(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);
- /* trim trailing whitespace */
- opt = strlen(in_from_stdin) - 1;
- while (isspace(in_from_stdin[opt]))
- opt--;
- in_from_stdin[++opt] = 0;
+ 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;
+}
+#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
+
+/* Correct regardless of combination of CONFIG_xxx */
+enum {
+ OPTBIT_VERBOSE = 0,
+ OPTBIT_NO_EMPTY,
+ OPTBIT_UPTO_NUMBER,
+ OPTBIT_UPTO_SIZE,
+ OPTBIT_EOF_STRING,
+ USE_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
+ USE_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
+ USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
+
+ OPT_VERBOSE = 1<<OPTBIT_VERBOSE ,
+ OPT_NO_EMPTY = 1<<OPTBIT_NO_EMPTY ,
+ OPT_UPTO_NUMBER = 1<<OPTBIT_UPTO_NUMBER,
+ OPT_UPTO_SIZE = 1<<OPTBIT_UPTO_SIZE ,
+ OPT_EOF_STRING = 1<<OPTBIT_EOF_STRING ,
+ OPT_INTERACTIVE = USE_FEATURE_XARGS_SUPPORT_CONFIRMATION((1<<OPTBIT_INTERACTIVE)) + 0,
+ OPT_TERMINATE = USE_FEATURE_XARGS_SUPPORT_TERMOPT( (1<<OPTBIT_TERMINATE )) + 0,
+ OPT_ZEROTERM = USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1<<OPTBIT_ZEROTERM )) + 0,
+};
+#define OPTION_STR "+trn:s:e::" \
+ USE_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
+ USE_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
+ USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
- /* Strip out any leading whitespace */
- tmp=in_from_stdin;
- while(isspace(*tmp))
- tmp++;
+int xargs_main(int argc, char **argv)
+{
+ char **args;
+ int i, 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 opt;
+ size_t n_max_chars;
+#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
+ xlist_t* (*read_args)(xlist_t*, const char*, size_t, char*) = process_stdin;
+#else
+#define read_args process_stdin
+#endif
- strcat(args, tmp);
- strcat(args, " ");
+ opt = getopt32(argc, argv, OPTION_STR, &max_args, &max_chars, &eof_str);
- free(in_from_stdin);
- in_from_stdin = get_line_from_file(stdin);
+ if (opt & OPT_ZEROTERM)
+ USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
+
+ argc -= optind;
+ argv += optind;
+ if (!argc) {
+ /* default behavior is to echo all the filenames */
+ *argv = "echo";
+ argc++;
+ }
+
+ 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 = xatoul_range(max_chars, 1, orig_arg_max);
+ for (i = 0; i < argc; 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 (traceflag==1) {
- fputs(cmd_to_be_executed, stderr);
- fputs(args, stderr);
+ if (opt & OPT_UPTO_NUMBER) {
+ n_max_arg = xatoul_range(max_args, 1, INT_MAX);
+ } else {
+ n_max_arg = n_max_chars;
}
- if ((pid = fork()) == 0) {
- char *cmd[255];
- int i=1;
+ while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL ||
+ !(opt & OPT_NO_EMPTY))
+ {
+ 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 */
+
+ /* allocate pointers for execvp:
+ argc*arg, n*arg from stdin, NULL */
+ args = xzalloc((n + argc + 1) * sizeof(char *));
+
+ /* store the command to be executed
+ (taken from the command line) */
+ for (i = 0; i < argc; i++)
+ args[i] = argv[i];
+ /* (taken from stdin) */
+ for (cur = list; n; cur = cur->link) {
+ args[i++] = cur->data;
+ n--;
+ }
- //printf("argv[0]='%s'\n", cmd_to_be_executed);
- cmd[0] = cmd_to_be_executed;
- while (--argc && ++argv && *argv ) {
- //printf("argv[%d]='%s'\n", i, *argv);
- cmd[i++]=*argv;
+ if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
+ for (i = 0; args[i]; i++) {
+ if (i)
+ fputc(' ', stderr);
+ fputs(args[i], stderr);
+ }
+ if (!(opt & OPT_INTERACTIVE))
+ fputc('\n', stderr);
+ }
+ if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
+ child_error = xargs_exec(args);
}
- //printf("argv[%d]='%s'\n", i, args);
- cmd[i++] = args;
- cmd[i] = NULL;
- execvp(cmd_to_be_executed, cmd);
- /* What? Still here? Exit with an error */
- fatalError("%s: %s\n", cmd_to_be_executed, strerror(errno));
+ /* clean up */
+ for (i = argc; args[i]; i++) {
+ cur = list;
+ list = list->link;
+ free(cur);
+ }
+ free(args);
+ if (child_error > 0 && child_error != 123) {
+ break;
+ }
}
- /* Wait for a child process to exit */
- wpid = wait(&status);
+ if (ENABLE_FEATURE_CLEAN_UP) free(max_chars);
+ return child_error;
+}
-#ifdef BB_FEATURE_CLEAN_UP
- free(args);
- free(cmd_to_be_executed);
-#endif
+#ifdef TEST
+
+const char *applet_name = "debug stuff usage";
- if (wpid > 0)
- return (WEXITSTATUS(status));
- else
- return EXIT_FAILURE;
+void bb_show_usage(void)
+{
+ fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
+ applet_name);
+ exit(1);
}
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+
+int main(int argc, char **argv)
+{
+ return xargs_main(argc, argv);
+}
+#endif /* TEST */
projects / oweals / busybox.git / blobdiff