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540 lines
13 KiB
C
540 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini xargs implementation for busybox
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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) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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*
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* Special thanks
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* - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
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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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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*
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* xargs is described in the Single Unix Specification v3 at
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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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#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 has 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 *const *args)
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{
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pid_t p;
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volatile int exec_errno = 0; /* shared vfork stack */
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int status;
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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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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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_exit(1);
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}
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/* vfork -- parent */
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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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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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}
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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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}
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if (WIFSTOPPED(status)) {
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bb_error_msg("%s: stopped by signal %d",
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args[0], WSTOPSIG(status));
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return 125;
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}
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if (WIFSIGNALED(status)) {
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bb_error_msg("%s: terminated by signal %d",
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args[0], WTERMSIG(status));
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return 125;
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}
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if (WEXITSTATUS(status))
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return 123;
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return 0;
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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 *process_stdin(xlist_t * list_arg,
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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 ((size_t)(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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}
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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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/* The variant does not support single quotes, double quotes or backslash */
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static xlist_t *process_stdin(xlist_t * list_arg,
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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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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 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 = xfopen(CURRENT_TTY, "r");
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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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#else
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# define xargs_ask_confirmation() 1
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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
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static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED,
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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 ((size_t)(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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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
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/* Correct regardless of combination of CONFIG_xxx */
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enum {
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OPTBIT_VERBOSE = 0,
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OPTBIT_NO_EMPTY,
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OPTBIT_UPTO_NUMBER,
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OPTBIT_UPTO_SIZE,
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OPTBIT_EOF_STRING,
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USE_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
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USE_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
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USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
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OPT_VERBOSE = 1<<OPTBIT_VERBOSE ,
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OPT_NO_EMPTY = 1<<OPTBIT_NO_EMPTY ,
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OPT_UPTO_NUMBER = 1<<OPTBIT_UPTO_NUMBER,
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OPT_UPTO_SIZE = 1<<OPTBIT_UPTO_SIZE ,
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OPT_EOF_STRING = 1<<OPTBIT_EOF_STRING ,
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OPT_INTERACTIVE = USE_FEATURE_XARGS_SUPPORT_CONFIRMATION((1<<OPTBIT_INTERACTIVE)) + 0,
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OPT_TERMINATE = USE_FEATURE_XARGS_SUPPORT_TERMOPT( (1<<OPTBIT_TERMINATE )) + 0,
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OPT_ZEROTERM = USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1<<OPTBIT_ZEROTERM )) + 0,
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};
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#define OPTION_STR "+trn:s:e::" \
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USE_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
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USE_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
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USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
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int xargs_main(int argc, char **argv)
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{
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char **args;
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int i, n;
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xlist_t *list = NULL;
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xlist_t *cur;
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int child_error = 0;
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char *max_args, *max_chars;
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int n_max_arg;
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size_t n_chars = 0;
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long orig_arg_max;
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const char *eof_str = "_";
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unsigned opt;
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size_t n_max_chars;
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#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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xlist_t* (*read_args)(xlist_t*, const char*, size_t, char*) = process_stdin;
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#else
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#define read_args process_stdin
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#endif
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opt = getopt32(argc, argv, OPTION_STR, &max_args, &max_chars, &eof_str);
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if (opt & OPT_ZEROTERM)
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USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
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argc -= optind;
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argv += optind;
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if (!argc) {
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/* default behavior is to echo all the filenames */
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*argv = "echo";
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argc++;
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}
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orig_arg_max = ARG_MAX;
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if (orig_arg_max == -1)
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orig_arg_max = LONG_MAX;
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orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048 */
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if (opt & OPT_UPTO_SIZE) {
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n_max_chars = xatoul_range(max_chars, 1, orig_arg_max);
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for (i = 0; i < argc; i++) {
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n_chars += strlen(*argv) + 1;
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}
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if (n_max_chars < n_chars) {
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bb_error_msg_and_die("cannot fit single argument within argument list size limit");
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}
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n_max_chars -= n_chars;
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} else {
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/* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
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have it at 1 meg). Things will work fine with a large ARG_MAX but it
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will probably hurt the system more than it needs to; an array of this
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size is allocated. */
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if (orig_arg_max > 20 * 1024)
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orig_arg_max = 20 * 1024;
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n_max_chars = orig_arg_max;
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}
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max_chars = xmalloc(n_max_chars);
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if (opt & OPT_UPTO_NUMBER) {
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n_max_arg = xatoul_range(max_args, 1, INT_MAX);
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} else {
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n_max_arg = n_max_chars;
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}
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while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL ||
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!(opt & OPT_NO_EMPTY))
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{
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opt |= OPT_NO_EMPTY;
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n = 0;
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n_chars = 0;
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#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
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for (cur = list; cur;) {
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n_chars += cur->lenght;
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n++;
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cur = cur->link;
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if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
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if (opt & OPT_TERMINATE)
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bb_error_msg_and_die("argument list too long");
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break;
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}
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}
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#else
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for (cur = list; cur; cur = cur->link) {
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n_chars += cur->lenght;
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n++;
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if (n_chars > n_max_chars || n == n_max_arg) {
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break;
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}
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}
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#endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
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/* allocate pointers for execvp:
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argc*arg, n*arg from stdin, NULL */
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args = xzalloc((n + argc + 1) * sizeof(char *));
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/* store the command to be executed
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(taken from the command line) */
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for (i = 0; i < argc; i++)
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args[i] = argv[i];
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/* (taken from stdin) */
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for (cur = list; n; cur = cur->link) {
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args[i++] = cur->data;
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n--;
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}
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if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
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for (i = 0; args[i]; i++) {
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if (i)
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fputc(' ', stderr);
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fputs(args[i], stderr);
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}
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if (!(opt & OPT_INTERACTIVE))
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fputc('\n', stderr);
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}
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if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
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child_error = xargs_exec(args);
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}
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/* clean up */
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for (i = argc; args[i]; i++) {
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|
cur = list;
|
|
list = list->link;
|
|
free(cur);
|
|
}
|
|
free(args);
|
|
if (child_error > 0 && child_error != 123) {
|
|
break;
|
|
}
|
|
}
|
|
if (ENABLE_FEATURE_CLEAN_UP) free(max_chars);
|
|
return child_error;
|
|
}
|
|
|
|
|
|
#ifdef TEST
|
|
|
|
const char *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",
|
|
applet_name);
|
|
exit(1);
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
return xargs_main(argc, argv);
|
|
}
|
|
#endif /* TEST */
|