![[BACK]](/icons/back.gif){kind=icon}
Return to xargs.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / xargs|
Return to xargs.c CVS log | Up to [local] / src / usr.bin / xargs |
1.22 ! jmc 1: /* $OpenBSD: xargs.c,v 1.21 2005/09/10 23:00:29 brad Exp $ */
1.14 millert 2: /* $FreeBSD: xargs.c,v 1.51 2003/05/03 19:09:11 obrien Exp $ */
1.1 deraadt 3:
4: /*-
5: * Copyright (c) 1990, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * John B. Roll Jr.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.12 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
1.14 millert 34: *
35: * $xMach: xargs.c,v 1.6 2002/02/23 05:27:47 tim Exp $
1.1 deraadt 36: */
37:
38: #ifndef lint
1.14 millert 39: static const char copyright[] =
1.1 deraadt 40: "@(#) Copyright (c) 1990, 1993\n\
41: The Regents of the University of California. All rights reserved.\n";
42: #endif /* not lint */
43:
44: #ifndef lint
45: #if 0
1.14 millert 46: static const char sccsid[] = "@(#)xargs.c 8.1 (Berkeley) 6/6/93";
47: #else
1.22 ! jmc 48: static const char rcsid[] = "$OpenBSD: xargs.c,v 1.21 2005/09/10 23:00:29 brad Exp $";
1.1 deraadt 49: #endif
50: #endif /* not lint */
51:
1.14 millert 52: #include <sys/param.h>
1.1 deraadt 53: #include <sys/wait.h>
1.14 millert 54:
55: #include <err.h>
1.1 deraadt 56: #include <errno.h>
1.14 millert 57: #include <fcntl.h>
58: #include <langinfo.h>
59: #include <locale.h>
60: #include <paths.h>
61: #include <regex.h>
62: #include <signal.h>
1.1 deraadt 63: #include <stdio.h>
64: #include <stdlib.h>
65: #include <string.h>
66: #include <unistd.h>
1.14 millert 67:
1.1 deraadt 68: #include "pathnames.h"
69:
1.14 millert 70: static void parse_input(int, char *[]);
71: static void prerun(int, char *[]);
72: static int prompt(void);
73: static void run(char **);
74: static void usage(void);
75: void strnsubst(char **, const char *, const char *, size_t);
76: static void waitchildren(const char *, int);
77:
78: static char **av, **bxp, **ep, **endxp, **xp;
79: static char *argp, *bbp, *ebp, *inpline, *p, *replstr;
80: static const char *eofstr;
81: static int count, insingle, indouble, oflag, pflag, tflag, Rflag, rval, zflag;
1.21 brad 82: static int cnt, Iflag, jfound, Lflag, wasquoted, xflag, runeof = 1;
1.14 millert 83: static int curprocs, maxprocs;
84: static size_t inpsize;
85:
86: extern char **environ;
1.1 deraadt 87:
88: int
1.13 deraadt 89: main(int argc, char *argv[])
1.1 deraadt 90: {
1.14 millert 91: long arg_max;
92: int ch, Jflag, nargs, nflag, nline;
93: size_t linelen;
94: char *endptr;
95:
96: inpline = replstr = NULL;
97: ep = environ;
98: eofstr = "";
99: Jflag = nflag = 0;
1.1 deraadt 100:
1.14 millert 101: (void)setlocale(LC_MESSAGES, "");
1.1 deraadt 102:
103: /*
104: * POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that
105: * caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given
106: * that the smallest argument is 2 bytes in length, this means that
107: * the number of arguments is limited to:
108: *
109: * (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2.
110: *
111: * We arbitrarily limit the number of arguments to 5000. This is
112: * allowed by POSIX.2 as long as the resulting minimum exec line is
113: * at least LINE_MAX. Realloc'ing as necessary is possible, but
114: * probably not worthwhile.
115: */
116: nargs = 5000;
1.8 deraadt 117: if ((arg_max = sysconf(_SC_ARG_MAX)) == -1)
118: errx(1, "sysconf(_SC_ARG_MAX) failed");
119: nline = arg_max - 4 * 1024;
1.14 millert 120: while (*ep != NULL) {
121: /* 1 byte for each '\0' */
122: nline -= strlen(*ep++) + 1 + sizeof(*ep);
123: }
124: maxprocs = 1;
1.21 brad 125: while ((ch = getopt(argc, argv, "0E:I:J:L:n:oP:pR:rs:tx")) != -1)
1.20 millert 126: switch (ch) {
1.14 millert 127: case 'E':
128: eofstr = optarg;
129: break;
130: case 'I':
131: Jflag = 0;
132: Iflag = 1;
133: Lflag = 1;
134: replstr = optarg;
135: break;
136: case 'J':
137: Iflag = 0;
138: Jflag = 1;
139: replstr = optarg;
140: break;
141: case 'L':
142: Lflag = atoi(optarg);
143: break;
1.1 deraadt 144: case 'n':
145: nflag = 1;
146: if ((nargs = atoi(optarg)) <= 0)
147: errx(1, "illegal argument count");
148: break;
1.14 millert 149: case 'o':
150: oflag = 1;
151: break;
152: case 'P':
153: if ((maxprocs = atoi(optarg)) <= 0)
154: errx(1, "max. processes must be >0");
155: break;
156: case 'p':
157: pflag = 1;
158: break;
1.21 brad 159: case 'r':
160: runeof = 0;
161: break;
1.14 millert 162: case 'R':
163: Rflag = strtol(optarg, &endptr, 10);
164: if (*endptr != '\0')
165: errx(1, "replacements must be a number");
166: break;
1.1 deraadt 167: case 's':
168: nline = atoi(optarg);
169: break;
170: case 't':
171: tflag = 1;
172: break;
173: case 'x':
174: xflag = 1;
175: break;
1.2 deraadt 176: case '0':
177: zflag = 1;
178: break;
1.1 deraadt 179: case '?':
180: default:
181: usage();
182: }
183: argc -= optind;
184: argv += optind;
185:
1.14 millert 186: if (!Iflag && Rflag)
187: usage();
188: if (Iflag && !Rflag)
189: Rflag = 5;
190: if (xflag && !nflag)
191: usage();
192: if (Iflag || Lflag)
193: xflag = 1;
194: if (replstr != NULL && *replstr == '\0')
195: errx(1, "replstr may not be empty");
196:
1.1 deraadt 197: /*
198: * Allocate pointers for the utility name, the utility arguments,
199: * the maximum arguments to be read from stdin and the trailing
200: * NULL.
201: */
1.14 millert 202: linelen = 1 + argc + nargs + 1;
203: if ((av = bxp = malloc(linelen * sizeof(char **))) == NULL)
1.1 deraadt 204: err(1, NULL);
205:
206: /*
207: * Use the user's name for the utility as argv[0], just like the
208: * shell. Echo is the default. Set up pointers for the user's
209: * arguments.
210: */
1.14 millert 211: if (*argv == NULL)
1.1 deraadt 212: cnt = strlen(*bxp++ = _PATH_ECHO);
213: else {
214: do {
1.14 millert 215: if (Jflag && strcmp(*argv, replstr) == 0) {
216: char **avj;
217: jfound = 1;
218: argv++;
219: for (avj = argv; *avj; avj++)
220: cnt += strlen(*avj) + 1;
221: break;
222: }
1.1 deraadt 223: cnt += strlen(*bxp++ = *argv) + 1;
1.14 millert 224: } while (*++argv != NULL);
1.1 deraadt 225: }
226:
227: /*
228: * Set up begin/end/traversing pointers into the array. The -n
229: * count doesn't include the trailing NULL pointer, so the malloc
230: * added in an extra slot.
231: */
1.14 millert 232: endxp = (xp = bxp) + nargs;
1.1 deraadt 233:
234: /*
235: * Allocate buffer space for the arguments read from stdin and the
236: * trailing NULL. Buffer space is defined as the default or specified
237: * space, minus the length of the utility name and arguments. Set up
238: * begin/end/traversing pointers into the array. The -s count does
239: * include the trailing NULL, so the malloc didn't add in an extra
240: * slot.
241: */
242: nline -= cnt;
243: if (nline <= 0)
244: errx(1, "insufficient space for command");
245:
1.14 millert 246: if ((bbp = malloc((size_t)(nline + 1))) == NULL)
1.18 millert 247: err(1, NULL);
1.1 deraadt 248: ebp = (argp = p = bbp) + nline - 1;
1.14 millert 249: for (;;)
250: parse_input(argc, argv);
251: }
252:
253: static void
254: parse_input(int argc, char *argv[])
255: {
1.20 millert 256: int ch, foundeof = 0;
1.14 millert 257: char **avj;
1.1 deraadt 258:
1.20 millert 259: switch (ch = getchar()) {
1.14 millert 260: case EOF:
261: /* No arguments since last exec. */
262: if (p == bbp) {
1.21 brad 263: if (runeof)
264: prerun(0, av);
1.14 millert 265: waitchildren(*argv, 1);
266: exit(rval);
267: }
268: goto arg1;
269: case ' ':
270: case '\t':
271: /* Quotes escape tabs and spaces. */
272: if (insingle || indouble || zflag)
273: goto addch;
274: goto arg2;
275: case '\0':
276: if (zflag)
1.1 deraadt 277: goto arg2;
1.14 millert 278: goto addch;
279: case '\n':
280: count++;
281: if (zflag)
1.2 deraadt 282: goto addch;
1.1 deraadt 283:
1.14 millert 284: /* Quotes do not escape newlines. */
285: arg1: if (insingle || indouble)
286: errx(1, "unterminated quote");
287: arg2:
288: foundeof = *eofstr != '\0' &&
289: strcmp(argp, eofstr) == 0;
290:
291: /* Do not make empty args unless they are quoted */
292: if ((argp != p || wasquoted) && !foundeof) {
293: *p++ = '\0';
1.1 deraadt 294: *xp++ = argp;
1.14 millert 295: if (Iflag) {
296: size_t curlen;
1.1 deraadt 297:
1.14 millert 298: if (inpline == NULL)
299: curlen = 0;
300: else {
301: /*
302: * If this string is not zero
303: * length, append a space for
304: * separation before the next
305: * argument.
306: */
307: if ((curlen = strlen(inpline)))
308: strlcat(inpline, " ", inpsize);
309: }
310: curlen++;
311: /*
312: * Allocate enough to hold what we will
313: * be holding in a second, and to append
314: * a space next time through, if we have
315: * to.
316: */
317: inpsize = curlen + 2 + strlen(argp);
318: inpline = realloc(inpline, inpsize);
319: if (inpline == NULL)
320: errx(1, "realloc failed");
321: if (curlen == 1)
322: strlcpy(inpline, argp, inpsize);
323: else
324: strlcat(inpline, argp, inpsize);
1.1 deraadt 325: }
1.14 millert 326: }
1.1 deraadt 327:
1.14 millert 328: /*
329: * If max'd out on args or buffer, or reached EOF,
330: * run the command. If xflag and max'd out on buffer
331: * but not on args, object. Having reached the limit
332: * of input lines, as specified by -L is the same as
333: * maxing out on arguments.
334: */
335: if (xp == endxp || p > ebp || ch == EOF ||
336: (Lflag <= count && xflag) || foundeof) {
337: if (xflag && xp != endxp && p > ebp)
1.1 deraadt 338: errx(1, "insufficient space for arguments");
1.14 millert 339: if (jfound) {
340: for (avj = argv; *avj; avj++)
341: *xp++ = *avj;
342: }
343: prerun(argc, av);
344: if (ch == EOF || foundeof) {
345: waitchildren(*argv, 1);
346: exit(rval);
347: }
348: p = bbp;
1.1 deraadt 349: xp = bxp;
1.14 millert 350: count = 0;
351: }
352: argp = p;
353: wasquoted = 0;
354: break;
355: case '\'':
356: if (indouble || zflag)
357: goto addch;
358: insingle = !insingle;
359: wasquoted = 1;
360: break;
361: case '"':
362: if (insingle || zflag)
363: goto addch;
364: indouble = !indouble;
365: wasquoted = 1;
366: break;
367: case '\\':
368: if (zflag)
369: goto addch;
370: /* Backslash escapes anything, is escaped by quotes. */
371: if (!insingle && !indouble && (ch = getchar()) == EOF)
372: errx(1, "backslash at EOF");
373: /* FALLTHROUGH */
374: default:
375: addch: if (p < ebp) {
1.1 deraadt 376: *p++ = ch;
377: break;
378: }
1.14 millert 379:
380: /* If only one argument, not enough buffer space. */
381: if (bxp == xp)
382: errx(1, "insufficient space for argument");
383: /* Didn't hit argument limit, so if xflag object. */
384: if (xflag)
385: errx(1, "insufficient space for arguments");
386:
387: if (jfound) {
388: for (avj = argv; *avj; avj++)
389: *xp++ = *avj;
390: }
391: prerun(argc, av);
392: xp = bxp;
393: cnt = ebp - argp;
394: memcpy(bbp, argp, (size_t)cnt);
395: p = (argp = bbp) + cnt;
396: *p++ = ch;
397: break;
398: }
1.1 deraadt 399: }
400:
1.14 millert 401: /*
402: * Do things necessary before run()'ing, such as -I substitution,
403: * and then call run().
404: */
405: static void
406: prerun(int argc, char *argv[])
407: {
408: char **tmp, **tmp2, **avj;
409: int repls;
410:
411: repls = Rflag;
1.21 brad 412: runeof = 0;
1.14 millert 413:
414: if (argc == 0 || repls == 0) {
415: *xp = NULL;
416: run(argv);
417: return;
418: }
419:
420: avj = argv;
421:
422: /*
423: * Allocate memory to hold the argument list, and
424: * a NULL at the tail.
425: */
426: tmp = malloc((argc + 1) * sizeof(char**));
427: if (tmp == NULL)
1.18 millert 428: err(1, NULL);
1.14 millert 429: tmp2 = tmp;
430:
431: /*
432: * Save the first argument and iterate over it, we
433: * cannot do strnsubst() to it.
434: */
435: if ((*tmp++ = strdup(*avj++)) == NULL)
1.18 millert 436: err(1, NULL);
1.14 millert 437:
438: /*
439: * For each argument to utility, if we have not used up
440: * the number of replacements we are allowed to do, and
441: * if the argument contains at least one occurrence of
442: * replstr, call strnsubst(), else just save the string.
443: * Iterations over elements of avj and tmp are done
444: * where appropriate.
445: */
446: while (--argc) {
447: *tmp = *avj++;
448: if (repls && strstr(*tmp, replstr) != NULL) {
449: strnsubst(tmp++, replstr, inpline, (size_t)255);
450: if (repls > 0)
451: repls--;
452: } else {
453: if ((*tmp = strdup(*tmp)) == NULL)
1.18 millert 454: err(1, NULL);
1.14 millert 455: tmp++;
456: }
457: }
458:
459: /*
460: * Run it.
461: */
462: *tmp = NULL;
463: run(tmp2);
464:
465: /*
466: * Walk from the tail to the head, free along the way.
467: */
468: for (; tmp2 != tmp; tmp--)
469: free(*tmp);
470: /*
471: * Now free the list itself.
472: */
473: free(tmp2);
474:
475: /*
476: * Free the input line buffer, if we have one.
477: */
478: if (inpline != NULL) {
479: free(inpline);
480: inpline = NULL;
481: }
482: }
483:
484: static void
1.13 deraadt 485: run(char **argv)
1.1 deraadt 486: {
487: pid_t pid;
1.14 millert 488: int fd;
489: char **avec;
1.1 deraadt 490:
1.14 millert 491: /*
492: * If the user wants to be notified of each command before it is
493: * executed, notify them. If they want the notification to be
494: * followed by a prompt, then prompt them.
495: */
496: if (tflag || pflag) {
1.1 deraadt 497: (void)fprintf(stderr, "%s", *argv);
1.14 millert 498: for (avec = argv + 1; *avec != NULL; ++avec)
499: (void)fprintf(stderr, " %s", *avec);
500: /*
501: * If the user has asked to be prompted, do so.
502: */
503: if (pflag)
504: /*
505: * If they asked not to exec, return without execution
506: * but if they asked to, go to the execution. If we
507: * could not open their tty, break the switch and drop
508: * back to -t behaviour.
509: */
510: switch (prompt()) {
511: case 0:
512: return;
513: case 1:
514: goto exec;
515: case 2:
516: break;
517: }
1.1 deraadt 518: (void)fprintf(stderr, "\n");
519: (void)fflush(stderr);
520: }
1.14 millert 521: exec:
1.20 millert 522: switch (pid = vfork()) {
1.1 deraadt 523: case -1:
524: err(1, "vfork");
525: case 0:
1.14 millert 526: if (oflag) {
1.17 tedu 527: if ((fd = open(_PATH_TTY, O_RDONLY)) == -1) {
528: warn("can't open /dev/tty");
529: _exit(1);
530: }
1.14 millert 531: } else {
532: fd = open(_PATH_DEVNULL, O_RDONLY);
533: }
534: if (fd > STDIN_FILENO) {
1.17 tedu 535: if (dup2(fd, STDIN_FILENO) != 0) {
536: warn("can't dup2 to stdin");
537: _exit(1);
538: }
1.16 millert 539: close(fd);
1.14 millert 540: }
1.1 deraadt 541: execvp(argv[0], argv);
1.19 millert 542: warn("%s", argv[0]);
543: _exit(errno == ENOENT ? 127 : 126);
1.1 deraadt 544: }
1.14 millert 545: curprocs++;
546: waitchildren(*argv, 0);
547: }
1.1 deraadt 548:
1.14 millert 549: static void
550: waitchildren(const char *name, int waitall)
551: {
552: pid_t pid;
553: int status;
1.1 deraadt 554:
1.14 millert 555: while ((pid = waitpid(-1, &status, !waitall && curprocs < maxprocs ?
556: WNOHANG : 0)) > 0) {
557: curprocs--;
558: /*
559: * According to POSIX, we have to exit if the utility exits
560: * with a 255 status, or is interrupted by a signal.
561: * We are allowed to return any exit status between 1 and
562: * 125 in these cases, but we'll use 124 and 125, the same
563: * values used by GNU xargs.
564: */
565: if (WIFEXITED(status)) {
566: if (WEXITSTATUS(status) == 255) {
567: warnx("%s exited with status 255", name);
568: exit(124);
1.19 millert 569: } else if (WEXITSTATUS(status) == 127 ||
570: WEXITSTATUS(status) == 126) {
571: exit(WEXITSTATUS(status));
1.14 millert 572: } else if (WEXITSTATUS(status) != 0) {
573: rval = 123;
574: }
575: } else if (WIFSIGNALED(status)) {
576: if (WTERMSIG(status) != SIGPIPE) {
577: if (WTERMSIG(status) < NSIG)
578: warnx("%s terminated by SIG%s", name,
579: sys_signame[WTERMSIG(status)]);
580: else
581: warnx("%s terminated by signal %d",
582: name, WTERMSIG(status));
583: }
584: exit(125);
1.6 deraadt 585: }
1.1 deraadt 586: }
1.14 millert 587: if (pid == -1 && errno != ECHILD)
588: err(1, "waitpid");
589: }
590:
591: /*
592: * Prompt the user about running a command.
593: */
594: static int
595: prompt(void)
596: {
597: regex_t cre;
598: size_t rsize;
599: int match;
600: char *response;
601: FILE *ttyfp;
602:
603: if ((ttyfp = fopen(_PATH_TTY, "r")) == NULL)
604: return (2); /* Indicate that the TTY failed to open. */
605: (void)fprintf(stderr, "?...");
606: (void)fflush(stderr);
607: if ((response = fgetln(ttyfp, &rsize)) == NULL ||
608: regcomp(&cre, nl_langinfo(YESEXPR), REG_BASIC) != 0) {
609: (void)fclose(ttyfp);
610: return (0);
611: }
612: match = regexec(&cre, response, 0, NULL, 0);
613: (void)fclose(ttyfp);
614: regfree(&cre);
615: return (match == 0);
1.1 deraadt 616: }
617:
1.14 millert 618: static void
1.13 deraadt 619: usage(void)
1.1 deraadt 620: {
1.13 deraadt 621: fprintf(stderr,
1.22 ! jmc 622: "usage: xargs [-0oprt] [-E eofstr] [-I replstr [-R replacements]] [-J replstr]\n"
1.14 millert 623: " [-L number] [-n number [-x]] [-P maxprocs] [-s size]\n"
624: " [utility [argument ...]]\n");
1.1 deraadt 625: exit(1);
626: }