1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Mini xargs implementation for busybox
|
---|
4 | *
|
---|
5 | * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
|
---|
6 | *
|
---|
7 | * Special thanks
|
---|
8 | * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
|
---|
9 | * - Mike Rendell <michael@cs.mun.ca>
|
---|
10 | * and David MacKenzie <djm@gnu.ai.mit.edu>.
|
---|
11 | *
|
---|
12 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
13 | *
|
---|
14 | * xargs is described in the Single Unix Specification v3 at
|
---|
15 | * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
|
---|
16 | */
|
---|
17 |
|
---|
18 | //applet:IF_XARGS(APPLET_NOEXEC(xargs, xargs, _BB_DIR_USR_BIN, _BB_SUID_DROP, xargs))
|
---|
19 |
|
---|
20 | //kbuild:lib-$(CONFIG_XARGS) += xargs.o
|
---|
21 |
|
---|
22 | //config:config XARGS
|
---|
23 | //config: bool "xargs"
|
---|
24 | //config: default y
|
---|
25 | //config: help
|
---|
26 | //config: xargs is used to execute a specified command for
|
---|
27 | //config: every item from standard input.
|
---|
28 | //config:
|
---|
29 | //config:config FEATURE_XARGS_SUPPORT_CONFIRMATION
|
---|
30 | //config: bool "Enable -p: prompt and confirmation"
|
---|
31 | //config: default y
|
---|
32 | //config: depends on XARGS
|
---|
33 | //config: help
|
---|
34 | //config: Support -p: prompt the user whether to run each command
|
---|
35 | //config: line and read a line from the terminal.
|
---|
36 | //config:
|
---|
37 | //config:config FEATURE_XARGS_SUPPORT_QUOTES
|
---|
38 | //config: bool "Enable single and double quotes and backslash"
|
---|
39 | //config: default y
|
---|
40 | //config: depends on XARGS
|
---|
41 | //config: help
|
---|
42 | //config: Support quoting in the input.
|
---|
43 | //config:
|
---|
44 | //config:config FEATURE_XARGS_SUPPORT_TERMOPT
|
---|
45 | //config: bool "Enable -x: exit if -s or -n is exceeded"
|
---|
46 | //config: default y
|
---|
47 | //config: depends on XARGS
|
---|
48 | //config: help
|
---|
49 | //config: Support -x: exit if the command size (see the -s or -n option)
|
---|
50 | //config: is exceeded.
|
---|
51 | //config:
|
---|
52 | //config:config FEATURE_XARGS_SUPPORT_ZERO_TERM
|
---|
53 | //config: bool "Enable -0: NUL-terminated input"
|
---|
54 | //config: default y
|
---|
55 | //config: depends on XARGS
|
---|
56 | //config: help
|
---|
57 | //config: Support -0: input items are terminated by a NUL character
|
---|
58 | //config: instead of whitespace, and the quotes and backslash
|
---|
59 | //config: are not special.
|
---|
60 |
|
---|
61 | #include "libbb.h"
|
---|
62 |
|
---|
63 | /* This is a NOEXEC applet. Be very careful! */
|
---|
64 |
|
---|
65 |
|
---|
66 | //#define dbg_msg(...) bb_error_msg(__VA_ARGS__)
|
---|
67 | #define dbg_msg(...) ((void)0)
|
---|
68 |
|
---|
69 |
|
---|
70 | #ifdef TEST
|
---|
71 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
|
---|
72 | # define ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION 1
|
---|
73 | # endif
|
---|
74 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
|
---|
75 | # define ENABLE_FEATURE_XARGS_SUPPORT_QUOTES 1
|
---|
76 | # endif
|
---|
77 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
|
---|
78 | # define ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT 1
|
---|
79 | # endif
|
---|
80 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
---|
81 | # define ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM 1
|
---|
82 | # endif
|
---|
83 | #endif
|
---|
84 |
|
---|
85 |
|
---|
86 | struct globals {
|
---|
87 | char **args;
|
---|
88 | const char *eof_str;
|
---|
89 | int idx;
|
---|
90 | } FIX_ALIASING;
|
---|
91 | #define G (*(struct globals*)&bb_common_bufsiz1)
|
---|
92 | #define INIT_G() do { } while (0)
|
---|
93 |
|
---|
94 |
|
---|
95 | /*
|
---|
96 | * This function has special algorithm.
|
---|
97 | * Don't use fork and include to main!
|
---|
98 | */
|
---|
99 | static int xargs_exec(void)
|
---|
100 | {
|
---|
101 | int status;
|
---|
102 |
|
---|
103 | status = spawn_and_wait(G.args);
|
---|
104 | if (status < 0) {
|
---|
105 | bb_simple_perror_msg(G.args[0]);
|
---|
106 | return errno == ENOENT ? 127 : 126;
|
---|
107 | }
|
---|
108 | if (status == 255) {
|
---|
109 | bb_error_msg("%s: exited with status 255; aborting", G.args[0]);
|
---|
110 | return 124;
|
---|
111 | }
|
---|
112 | if (status >= 0x180) {
|
---|
113 | bb_error_msg("%s: terminated by signal %d",
|
---|
114 | G.args[0], status - 0x180);
|
---|
115 | return 125;
|
---|
116 | }
|
---|
117 | if (status)
|
---|
118 | return 123;
|
---|
119 | return 0;
|
---|
120 | }
|
---|
121 |
|
---|
122 | /* In POSIX/C locale isspace is only these chars: "\t\n\v\f\r" and space.
|
---|
123 | * "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
|
---|
124 | */
|
---|
125 | #define ISSPACE(a) ({ unsigned char xargs__isspace = (a) - 9; xargs__isspace == (' ' - 9) || xargs__isspace <= (13 - 9); })
|
---|
126 |
|
---|
127 | static void store_param(char *s)
|
---|
128 | {
|
---|
129 | /* Grow by 256 elements at once */
|
---|
130 | if (!(G.idx & 0xff)) { /* G.idx == N*256 */
|
---|
131 | /* Enlarge, make G.args[(N+1)*256 - 1] last valid idx */
|
---|
132 | G.args = xrealloc(G.args, sizeof(G.args[0]) * (G.idx + 0x100));
|
---|
133 | }
|
---|
134 | G.args[G.idx++] = s;
|
---|
135 | }
|
---|
136 |
|
---|
137 | /* process[0]_stdin:
|
---|
138 | * Read characters into buf[n_max_chars+1], and when parameter delimiter
|
---|
139 | * is seen, store the address of a new parameter to args[].
|
---|
140 | * If reading discovers that last chars do not form the complete
|
---|
141 | * parameter, the pointer to the first such "tail character" is returned.
|
---|
142 | * (buf has extra byte at the end to accomodate terminating NUL
|
---|
143 | * of "tail characters" string).
|
---|
144 | * Otherwise, the returned pointer points to NUL byte.
|
---|
145 | * On entry, buf[] may contain some "seed chars" which are to become
|
---|
146 | * the beginning of the first parameter.
|
---|
147 | */
|
---|
148 |
|
---|
149 | #if ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
|
---|
150 | static char* FAST_FUNC process_stdin(int n_max_chars, int n_max_arg, char *buf)
|
---|
151 | {
|
---|
152 | #define NORM 0
|
---|
153 | #define QUOTE 1
|
---|
154 | #define BACKSLASH 2
|
---|
155 | #define SPACE 4
|
---|
156 | char q = '\0'; /* quote char */
|
---|
157 | char state = NORM;
|
---|
158 | char *s = buf; /* start of the word */
|
---|
159 | char *p = s + strlen(buf); /* end of the word */
|
---|
160 |
|
---|
161 | buf += n_max_chars; /* past buffer's end */
|
---|
162 |
|
---|
163 | /* "goto ret" is used instead of "break" to make control flow
|
---|
164 | * more obvious: */
|
---|
165 |
|
---|
166 | while (1) {
|
---|
167 | int c = getchar();
|
---|
168 | if (c == EOF) {
|
---|
169 | if (p != s)
|
---|
170 | goto close_word;
|
---|
171 | goto ret;
|
---|
172 | }
|
---|
173 | if (state == BACKSLASH) {
|
---|
174 | state = NORM;
|
---|
175 | goto set;
|
---|
176 | }
|
---|
177 | if (state == QUOTE) {
|
---|
178 | if (c != q)
|
---|
179 | goto set;
|
---|
180 | q = '\0';
|
---|
181 | state = NORM;
|
---|
182 | } else { /* if (state == NORM) */
|
---|
183 | if (ISSPACE(c)) {
|
---|
184 | if (p != s) {
|
---|
185 | close_word:
|
---|
186 | state = SPACE;
|
---|
187 | c = '\0';
|
---|
188 | goto set;
|
---|
189 | }
|
---|
190 | } else {
|
---|
191 | if (c == '\\') {
|
---|
192 | state = BACKSLASH;
|
---|
193 | } else if (c == '\'' || c == '"') {
|
---|
194 | q = c;
|
---|
195 | state = QUOTE;
|
---|
196 | } else {
|
---|
197 | set:
|
---|
198 | *p++ = c;
|
---|
199 | }
|
---|
200 | }
|
---|
201 | }
|
---|
202 | if (state == SPACE) { /* word's delimiter or EOF detected */
|
---|
203 | if (q) {
|
---|
204 | bb_error_msg_and_die("unmatched %s quote",
|
---|
205 | q == '\'' ? "single" : "double");
|
---|
206 | }
|
---|
207 | /* A full word is loaded */
|
---|
208 | if (G.eof_str) {
|
---|
209 | if (strcmp(s, G.eof_str) == 0) {
|
---|
210 | while (getchar() != EOF)
|
---|
211 | continue;
|
---|
212 | p = s;
|
---|
213 | goto ret;
|
---|
214 | }
|
---|
215 | }
|
---|
216 | store_param(s);
|
---|
217 | dbg_msg("args[]:'%s'", s);
|
---|
218 | s = p;
|
---|
219 | n_max_arg--;
|
---|
220 | if (n_max_arg == 0) {
|
---|
221 | goto ret;
|
---|
222 | }
|
---|
223 | state = NORM;
|
---|
224 | }
|
---|
225 | if (p == buf) {
|
---|
226 | goto ret;
|
---|
227 | }
|
---|
228 | }
|
---|
229 | ret:
|
---|
230 | *p = '\0';
|
---|
231 | /* store_param(NULL) - caller will do it */
|
---|
232 | dbg_msg("return:'%s'", s);
|
---|
233 | return s;
|
---|
234 | }
|
---|
235 | #else
|
---|
236 | /* The variant does not support single quotes, double quotes or backslash */
|
---|
237 | static char* FAST_FUNC process_stdin(int n_max_chars, int n_max_arg, char *buf)
|
---|
238 | {
|
---|
239 | char *s = buf; /* start of the word */
|
---|
240 | char *p = s + strlen(buf); /* end of the word */
|
---|
241 |
|
---|
242 | buf += n_max_chars; /* past buffer's end */
|
---|
243 |
|
---|
244 | while (1) {
|
---|
245 | int c = getchar();
|
---|
246 | if (c == EOF) {
|
---|
247 | if (p == s)
|
---|
248 | goto ret;
|
---|
249 | }
|
---|
250 | if (c == EOF || ISSPACE(c)) {
|
---|
251 | if (p == s)
|
---|
252 | continue;
|
---|
253 | c = EOF;
|
---|
254 | }
|
---|
255 | *p++ = (c == EOF ? '\0' : c);
|
---|
256 | if (c == EOF) { /* word's delimiter or EOF detected */
|
---|
257 | /* A full word is loaded */
|
---|
258 | if (G.eof_str) {
|
---|
259 | if (strcmp(s, G.eof_str) == 0) {
|
---|
260 | while (getchar() != EOF)
|
---|
261 | continue;
|
---|
262 | p = s;
|
---|
263 | goto ret;
|
---|
264 | }
|
---|
265 | }
|
---|
266 | store_param(s);
|
---|
267 | dbg_msg("args[]:'%s'", s);
|
---|
268 | s = p;
|
---|
269 | n_max_arg--;
|
---|
270 | if (n_max_arg == 0) {
|
---|
271 | goto ret;
|
---|
272 | }
|
---|
273 | }
|
---|
274 | if (p == buf) {
|
---|
275 | goto ret;
|
---|
276 | }
|
---|
277 | }
|
---|
278 | ret:
|
---|
279 | *p = '\0';
|
---|
280 | /* store_param(NULL) - caller will do it */
|
---|
281 | dbg_msg("return:'%s'", s);
|
---|
282 | return s;
|
---|
283 | }
|
---|
284 | #endif /* FEATURE_XARGS_SUPPORT_QUOTES */
|
---|
285 |
|
---|
286 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
---|
287 | static char* FAST_FUNC process0_stdin(int n_max_chars, int n_max_arg, char *buf)
|
---|
288 | {
|
---|
289 | char *s = buf; /* start of the word */
|
---|
290 | char *p = s + strlen(buf); /* end of the word */
|
---|
291 |
|
---|
292 | buf += n_max_chars; /* past buffer's end */
|
---|
293 |
|
---|
294 | while (1) {
|
---|
295 | int c = getchar();
|
---|
296 | if (c == EOF) {
|
---|
297 | if (p == s)
|
---|
298 | goto ret;
|
---|
299 | c = '\0';
|
---|
300 | }
|
---|
301 | *p++ = c;
|
---|
302 | if (c == '\0') { /* word's delimiter or EOF detected */
|
---|
303 | /* A full word is loaded */
|
---|
304 | store_param(s);
|
---|
305 | dbg_msg("args[]:'%s'", s);
|
---|
306 | s = p;
|
---|
307 | n_max_arg--;
|
---|
308 | if (n_max_arg == 0) {
|
---|
309 | goto ret;
|
---|
310 | }
|
---|
311 | }
|
---|
312 | if (p == buf) {
|
---|
313 | goto ret;
|
---|
314 | }
|
---|
315 | }
|
---|
316 | ret:
|
---|
317 | *p = '\0';
|
---|
318 | /* store_param(NULL) - caller will do it */
|
---|
319 | dbg_msg("return:'%s'", s);
|
---|
320 | return s;
|
---|
321 | }
|
---|
322 | #endif /* FEATURE_XARGS_SUPPORT_ZERO_TERM */
|
---|
323 |
|
---|
324 | #if ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
|
---|
325 | /* Prompt the user for a response, and
|
---|
326 | if the user responds affirmatively, return true;
|
---|
327 | otherwise, return false. Uses "/dev/tty", not stdin. */
|
---|
328 | static int xargs_ask_confirmation(void)
|
---|
329 | {
|
---|
330 | FILE *tty_stream;
|
---|
331 | int c, savec;
|
---|
332 |
|
---|
333 | tty_stream = xfopen_for_read(CURRENT_TTY);
|
---|
334 | fputs(" ?...", stderr);
|
---|
335 | fflush_all();
|
---|
336 | c = savec = getc(tty_stream);
|
---|
337 | while (c != EOF && c != '\n')
|
---|
338 | c = getc(tty_stream);
|
---|
339 | fclose(tty_stream);
|
---|
340 | return (savec == 'y' || savec == 'Y');
|
---|
341 | }
|
---|
342 | #else
|
---|
343 | # define xargs_ask_confirmation() 1
|
---|
344 | #endif
|
---|
345 |
|
---|
346 | //usage:#define xargs_trivial_usage
|
---|
347 | //usage: "[OPTIONS] [PROG ARGS]"
|
---|
348 | //usage:#define xargs_full_usage "\n\n"
|
---|
349 | //usage: "Run PROG on every item given by stdin\n"
|
---|
350 | //usage: "\nOptions:"
|
---|
351 | //usage: IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(
|
---|
352 | //usage: "\n -p Ask user whether to run each command"
|
---|
353 | //usage: )
|
---|
354 | //usage: "\n -r Don't run command if input is empty"
|
---|
355 | //usage: IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(
|
---|
356 | //usage: "\n -0 Input is separated by NUL characters"
|
---|
357 | //usage: )
|
---|
358 | //usage: "\n -t Print the command on stderr before execution"
|
---|
359 | //usage: "\n -e[STR] STR stops input processing"
|
---|
360 | //usage: "\n -n N Pass no more than N args to PROG"
|
---|
361 | //usage: "\n -s N Pass command line of no more than N bytes"
|
---|
362 | //usage: IF_FEATURE_XARGS_SUPPORT_TERMOPT(
|
---|
363 | //usage: "\n -x Exit if size is exceeded"
|
---|
364 | //usage: )
|
---|
365 | //usage:#define xargs_example_usage
|
---|
366 | //usage: "$ ls | xargs gzip\n"
|
---|
367 | //usage: "$ find . -name '*.c' -print | xargs rm\n"
|
---|
368 |
|
---|
369 | /* Correct regardless of combination of CONFIG_xxx */
|
---|
370 | enum {
|
---|
371 | OPTBIT_VERBOSE = 0,
|
---|
372 | OPTBIT_NO_EMPTY,
|
---|
373 | OPTBIT_UPTO_NUMBER,
|
---|
374 | OPTBIT_UPTO_SIZE,
|
---|
375 | OPTBIT_EOF_STRING,
|
---|
376 | OPTBIT_EOF_STRING1,
|
---|
377 | IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
|
---|
378 | IF_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
|
---|
379 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
|
---|
380 |
|
---|
381 | OPT_VERBOSE = 1 << OPTBIT_VERBOSE ,
|
---|
382 | OPT_NO_EMPTY = 1 << OPTBIT_NO_EMPTY ,
|
---|
383 | OPT_UPTO_NUMBER = 1 << OPTBIT_UPTO_NUMBER,
|
---|
384 | OPT_UPTO_SIZE = 1 << OPTBIT_UPTO_SIZE ,
|
---|
385 | OPT_EOF_STRING = 1 << OPTBIT_EOF_STRING , /* GNU: -e[<param>] */
|
---|
386 | OPT_EOF_STRING1 = 1 << OPTBIT_EOF_STRING1, /* SUS: -E<param> */
|
---|
387 | OPT_INTERACTIVE = IF_FEATURE_XARGS_SUPPORT_CONFIRMATION((1 << OPTBIT_INTERACTIVE)) + 0,
|
---|
388 | OPT_TERMINATE = IF_FEATURE_XARGS_SUPPORT_TERMOPT( (1 << OPTBIT_TERMINATE )) + 0,
|
---|
389 | OPT_ZEROTERM = IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1 << OPTBIT_ZEROTERM )) + 0,
|
---|
390 | };
|
---|
391 | #define OPTION_STR "+trn:s:e::E:" \
|
---|
392 | IF_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
|
---|
393 | IF_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
|
---|
394 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
|
---|
395 |
|
---|
396 | int xargs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
397 | int xargs_main(int argc, char **argv)
|
---|
398 | {
|
---|
399 | int i;
|
---|
400 | int child_error = 0;
|
---|
401 | char *max_args;
|
---|
402 | char *max_chars;
|
---|
403 | char *buf;
|
---|
404 | unsigned opt;
|
---|
405 | int n_max_chars;
|
---|
406 | int n_max_arg;
|
---|
407 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
---|
408 | char* FAST_FUNC (*read_args)(int, int, char*) = process_stdin;
|
---|
409 | #else
|
---|
410 | #define read_args process_stdin
|
---|
411 | #endif
|
---|
412 |
|
---|
413 | INIT_G();
|
---|
414 |
|
---|
415 | G.eof_str = NULL;
|
---|
416 | opt = getopt32(argv, OPTION_STR, &max_args, &max_chars, &G.eof_str, &G.eof_str);
|
---|
417 |
|
---|
418 | /* -E ""? You may wonder why not just omit -E?
|
---|
419 | * This is used for portability:
|
---|
420 | * old xargs was using "_" as default for -E / -e */
|
---|
421 | if ((opt & OPT_EOF_STRING1) && G.eof_str[0] == '\0')
|
---|
422 | G.eof_str = NULL;
|
---|
423 |
|
---|
424 | if (opt & OPT_ZEROTERM)
|
---|
425 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
|
---|
426 |
|
---|
427 | argv += optind;
|
---|
428 | argc -= optind;
|
---|
429 | if (!argv[0]) {
|
---|
430 | /* default behavior is to echo all the filenames */
|
---|
431 | *--argv = (char*)"echo";
|
---|
432 | argc++;
|
---|
433 | }
|
---|
434 |
|
---|
435 | /* -s NUM default. fileutils-4.4.2 uses 128k, but I heasitate
|
---|
436 | * to use such a big value - first need to change code to use
|
---|
437 | * growable buffer instead of fixed one.
|
---|
438 | */
|
---|
439 | n_max_chars = 32 * 1024;
|
---|
440 | /* Make smaller if system does not allow our default value.
|
---|
441 | * The Open Group Base Specifications Issue 6:
|
---|
442 | * "The xargs utility shall limit the command line length such that
|
---|
443 | * when the command line is invoked, the combined argument
|
---|
444 | * and environment lists (see the exec family of functions
|
---|
445 | * in the System Interfaces volume of IEEE Std 1003.1-2001)
|
---|
446 | * shall not exceed {ARG_MAX}-2048 bytes".
|
---|
447 | */
|
---|
448 | {
|
---|
449 | long arg_max = 0;
|
---|
450 | #if defined _SC_ARG_MAX
|
---|
451 | arg_max = sysconf(_SC_ARG_MAX) - 2048;
|
---|
452 | #elif defined ARG_MAX
|
---|
453 | arg_max = ARG_MAX - 2048;
|
---|
454 | #endif
|
---|
455 | if (arg_max > 0 && n_max_chars > arg_max)
|
---|
456 | n_max_chars = arg_max;
|
---|
457 | }
|
---|
458 | if (opt & OPT_UPTO_SIZE) {
|
---|
459 | n_max_chars = xatou_range(max_chars, 1, INT_MAX);
|
---|
460 | }
|
---|
461 | /* Account for prepended fixed arguments */
|
---|
462 | {
|
---|
463 | size_t n_chars = 0;
|
---|
464 | for (i = 0; argv[i]; i++) {
|
---|
465 | n_chars += strlen(argv[i]) + 1;
|
---|
466 | }
|
---|
467 | n_max_chars -= n_chars;
|
---|
468 | }
|
---|
469 | /* Sanity check */
|
---|
470 | if (n_max_chars <= 0) {
|
---|
471 | bb_error_msg_and_die("can't fit single argument within argument list size limit");
|
---|
472 | }
|
---|
473 |
|
---|
474 | buf = xzalloc(n_max_chars + 1);
|
---|
475 |
|
---|
476 | n_max_arg = n_max_chars;
|
---|
477 | if (opt & OPT_UPTO_NUMBER) {
|
---|
478 | n_max_arg = xatou_range(max_args, 1, INT_MAX);
|
---|
479 | /* Not necessary, we use growable args[]: */
|
---|
480 | /* if (n_max_arg > n_max_chars) n_max_arg = n_max_chars */
|
---|
481 | }
|
---|
482 |
|
---|
483 | /* Allocate pointers for execvp */
|
---|
484 | /* We can statically allocate (argc + n_max_arg + 1) elements
|
---|
485 | * and do not bother with resizing args[], but on 64-bit machines
|
---|
486 | * this results in args[] vector which is ~8 times bigger
|
---|
487 | * than n_max_chars! That is, with n_max_chars == 20k,
|
---|
488 | * args[] will take 160k (!), which will most likely be
|
---|
489 | * almost entirely unused.
|
---|
490 | */
|
---|
491 | /* See store_param() for matching 256-step growth logic */
|
---|
492 | G.args = xmalloc(sizeof(G.args[0]) * ((argc + 0xff) & ~0xff));
|
---|
493 |
|
---|
494 | /* Store the command to be executed, part 1 */
|
---|
495 | for (i = 0; argv[i]; i++)
|
---|
496 | G.args[i] = argv[i];
|
---|
497 |
|
---|
498 | while (1) {
|
---|
499 | char *rem;
|
---|
500 |
|
---|
501 | G.idx = argc;
|
---|
502 | rem = read_args(n_max_chars, n_max_arg, buf);
|
---|
503 | store_param(NULL);
|
---|
504 |
|
---|
505 | if (!G.args[argc]) {
|
---|
506 | if (*rem != '\0')
|
---|
507 | bb_error_msg_and_die("argument line too long");
|
---|
508 | if (opt & OPT_NO_EMPTY)
|
---|
509 | break;
|
---|
510 | }
|
---|
511 | opt |= OPT_NO_EMPTY;
|
---|
512 |
|
---|
513 | if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
|
---|
514 | const char *fmt = " %s" + 1;
|
---|
515 | char **args = G.args;
|
---|
516 | for (i = 0; args[i]; i++) {
|
---|
517 | fprintf(stderr, fmt, args[i]);
|
---|
518 | fmt = " %s";
|
---|
519 | }
|
---|
520 | if (!(opt & OPT_INTERACTIVE))
|
---|
521 | bb_putchar_stderr('\n');
|
---|
522 | }
|
---|
523 |
|
---|
524 | if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
|
---|
525 | child_error = xargs_exec();
|
---|
526 | }
|
---|
527 |
|
---|
528 | if (child_error > 0 && child_error != 123) {
|
---|
529 | break;
|
---|
530 | }
|
---|
531 |
|
---|
532 | overlapping_strcpy(buf, rem);
|
---|
533 | } /* while */
|
---|
534 |
|
---|
535 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
536 | free(G.args);
|
---|
537 | free(buf);
|
---|
538 | }
|
---|
539 |
|
---|
540 | return child_error;
|
---|
541 | }
|
---|
542 |
|
---|
543 |
|
---|
544 | #ifdef TEST
|
---|
545 |
|
---|
546 | const char *applet_name = "debug stuff usage";
|
---|
547 |
|
---|
548 | void bb_show_usage(void)
|
---|
549 | {
|
---|
550 | fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
|
---|
551 | applet_name);
|
---|
552 | exit(EXIT_FAILURE);
|
---|
553 | }
|
---|
554 |
|
---|
555 | int main(int argc, char **argv)
|
---|
556 | {
|
---|
557 | return xargs_main(argc, argv);
|
---|
558 | }
|
---|
559 | #endif /* TEST */
|
---|