From: Lionel Sambuc Date: Fri, 23 Aug 2013 22:59:39 +0000 (+0200) Subject: Importing usr.bin/xargs X-Git-Tag: v3.3.0~816 X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/man.dnssec-checkds.html?a=commitdiff_plain;h=00785f561ffa2989d4501207adef5561801ef1ad;p=minix.git Importing usr.bin/xargs Change-Id: I6a8ce6a8eee31942abb4db797672da7d00dfa43d --- diff --git a/commands/Makefile b/commands/Makefile index d8362e4f7..cfd3960b2 100644 --- a/commands/Makefile +++ b/commands/Makefile @@ -30,7 +30,7 @@ SUBDIR= add_route arp ash at backup btrace \ truncate tty udpstat umount uname \ unstack update uud uue version vol \ whereis which write writeisofs fetch \ - xargs zdump zmodem pkgin_cd pkgin_all \ + zdump zmodem pkgin_cd pkgin_all \ worldstone updateboot update_bootcfg .if ${MACHINE_ARCH} == "i386" diff --git a/commands/xargs/Makefile b/commands/xargs/Makefile deleted file mode 100644 index 8578e0f74..000000000 --- a/commands/xargs/Makefile +++ /dev/null @@ -1,4 +0,0 @@ -PROG= xargs -MAN= - -.include diff --git a/commands/xargs/xargs.c b/commands/xargs/xargs.c deleted file mode 100644 index 645ef6ce1..000000000 --- a/commands/xargs/xargs.c +++ /dev/null @@ -1,426 +0,0 @@ -/*- - * Copyright (c) 1990 The Regents of the University of California. - * All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * John B. Roll Jr. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#ifndef lint -char copyright[] = -"@(#) Copyright (c) 1990 The Regents of the University of California.\n\ - All rights reserved.\n"; -#endif /* not lint */ - -#ifndef lint -#if 0 -static char sccsid[] = "@(#)xargs.c 5.11 (Berkeley) 6/19/91"; -#endif -#endif /* not lint */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#if __minix -#define _PATH_ECHO "/bin/echo" -#else -#include "pathnames.h" -#endif - -#ifndef ARG_MAX -#define ARG_MAX (sizeof(int) == 2 ? 4096 : 128 * 1024) -#endif - -int exit_status = 0; -int tflag; -void err(const char *, ...); -void run(char **argv); -void usage(void); - -int main(int argc, char **argv) -{ - extern int optind; - extern char *optarg; - register int ch; - register char *p, *bbp, *ebp, **bxp, **exp, **xp; - int cnt, indouble, insingle, nargs, nflag, nline, xflag, zflag; - char **av, *argp; - - /* - * POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that - * caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given - * that the smallest argument is 2 bytes in length, this means that - * the number of arguments is limited to: - * - * (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2. - * - * We arbitrarily limit the number of arguments to 5000. This is - * allowed by POSIX.2 as long as the resulting minimum exec line is - * at least LINE_MAX. Realloc'ing as necessary is possible, but - * probably not worthwhile. - */ -#if !__minix || __minix_vmd - nargs = 5000; - nline = ARG_MAX - 4 * 1024; -#else - /* Things are more cramped under standard Minix. */ - nargs = 80 * sizeof(int); - nline = ARG_MAX - 512 * sizeof(int); -#endif - nflag = xflag = zflag = 0; - while ((ch = getopt(argc, argv, "n:s:tx0")) != EOF) - switch(ch) { - case 'n': - nflag = 1; - if ((nargs = atoi(optarg)) <= 0) - err("illegal argument count"); - break; - case 's': - nline = atoi(optarg); - break; - case 't': - tflag = 1; - break; - case 'x': - xflag = 1; - break; - case '0': - zflag = 1; - break; - case '?': - default: - usage(); - } - argc -= optind; - argv += optind; - - if (xflag && !nflag) - usage(); - - /* - * Allocate pointers for the utility name, the utility arguments, - * the maximum arguments to be read from stdin and the trailing - * NULL. - */ - if (!(av = bxp = - malloc((u_int)(1 + argc + nargs + 1) * sizeof(char **)))) - err("%s", strerror(errno)); - - /* - * Use the user's name for the utility as argv[0], just like the - * shell. Echo is the default. Set up pointers for the user's - * arguments. - */ - if (!*argv) - cnt = strlen(*bxp++ = _PATH_ECHO); - else { - cnt = 0; - do { - cnt += strlen(*bxp++ = *argv) + 1; - } while (*++argv); - } - - /* - * Set up begin/end/traversing pointers into the array. The -n - * count doesn't include the trailing NULL pointer, so the malloc - * added in an extra slot. - */ - exp = (xp = bxp) + nargs; - - /* - * Allocate buffer space for the arguments read from stdin and the - * trailing NULL. Buffer space is defined as the default or specified - * space, minus the length of the utility name and arguments. Set up - * begin/end/traversing pointers into the array. The -s count does - * include the trailing NULL, so the malloc didn't add in an extra - * slot. - */ - nline -= cnt; - if (nline <= 0) - err("insufficient space for command"); - - if (!(bbp = malloc((u_int)nline + 1))) - err("%s", strerror(errno)); - ebp = (argp = p = bbp) + nline - 1; - - if (zflag) { - /* Read pathnames terminated by null bytes as produced by - * find ... -print0. No comments in this code, see further - * below. - */ - for (;;) - switch(ch = getchar()) { - case EOF: - if (p == bbp) - exit(exit_status); - - if (argp == p) { - *xp = NULL; - run(av); - exit(exit_status); - } - /*FALL THROUGH*/ - case '\0': - if (argp == p) - continue; - - *p = '\0'; - *xp++ = argp; - - if (xp == exp || p == ebp || ch == EOF) { - if (xflag && xp != exp && p == ebp) - err( - "insufficient space for arguments"); - *xp = NULL; - run(av); - if (ch == EOF) - exit(exit_status); - p = bbp; - xp = bxp; - } else - ++p; - argp = p; - break; - default: - if (p < ebp) { - *p++ = ch; - break; - } - - if (bxp == xp) - err("insufficient space for argument"); - if (xflag) - err("insufficient space for arguments"); - - *xp = NULL; - run(av); - xp = bxp; - cnt = ebp - argp; - bcopy(argp, bbp, cnt); - p = (argp = bbp) + cnt; - *p++ = ch; - break; - } - /* NOTREACHED */ - } - - for (insingle = indouble = 0;;) - switch(ch = getchar()) { - case EOF: - /* No arguments since last exec. */ - if (p == bbp) - exit(exit_status); - - /* Nothing since end of last argument. */ - if (argp == p) { - *xp = NULL; - run(av); - exit(exit_status); - } - goto arg1; - case ' ': - case '\t': - /* Quotes escape tabs and spaces. */ - if (insingle || indouble) - goto addch; - goto arg2; - case '\n': - /* Empty lines are skipped. */ - if (argp == p) - continue; - - /* Quotes do not escape newlines. */ -arg1: if (insingle || indouble) - err("unterminated quote"); - -arg2: *p = '\0'; - *xp++ = argp; - - /* - * If max'd out on args or buffer, or reached EOF, - * run the command. If xflag and max'd out on buffer - * but not on args, object. - */ - if (xp == exp || p == ebp || ch == EOF) { - if (xflag && xp != exp && p == ebp) - err("insufficient space for arguments"); - *xp = NULL; - run(av); - if (ch == EOF) - exit(exit_status); - p = bbp; - xp = bxp; - } else - ++p; - argp = p; - break; - case '\'': - if (indouble) - goto addch; - insingle = !insingle; - break; - case '"': - if (insingle) - goto addch; - indouble = !indouble; - break; - case '\\': - /* Backslash escapes anything, is escaped by quotes. */ - if (!insingle && !indouble && (ch = getchar()) == EOF) - err("backslash at EOF"); - /* FALLTHROUGH */ - default: -addch: if (p < ebp) { - *p++ = ch; - break; - } - - /* If only one argument, not enough buffer space. */ - if (bxp == xp) - err("insufficient space for argument"); - /* Didn't hit argument limit, so if xflag object. */ - if (xflag) - err("insufficient space for arguments"); - - *xp = NULL; - run(av); - xp = bxp; - cnt = ebp - argp; - bcopy(argp, bbp, cnt); - p = (argp = bbp) + cnt; - *p++ = ch; - break; - } - /* NOTREACHED */ -} - -void run(char **argv) -{ - register char **p; - pid_t pid; - int noinvoke; - int status; - int pfd[2]; - - if (tflag) { - (void)fprintf(stderr, "%s", *argv); - for (p = argv + 1; *p; ++p) - (void)fprintf(stderr, " %s", *p); - (void)fprintf(stderr, "\n"); - (void)fflush(stderr); - } - if (pipe(pfd) < 0) err("pipe: %s", strerror(errno)); - - switch(pid = fork()) { - case -1: - err("fork: %s", strerror(errno)); - case 0: - close(pfd[0]); - fcntl(pfd[1], F_SETFD, fcntl(pfd[1], F_GETFD) | FD_CLOEXEC); - - execvp(argv[0], argv); - noinvoke = (errno == ENOENT) ? 127 : 126; - (void)fprintf(stderr, - "xargs: %s exec failed: %s.\n", argv[0], strerror(errno)); - - /* Modern way of returning noinvoke instead of a dirty vfork() - * trick: (kjb) - */ - write(pfd[1], &noinvoke, sizeof(noinvoke)); - _exit(-1); - } - close(pfd[1]); - if (read(pfd[0], &noinvoke, sizeof(noinvoke)) < sizeof(noinvoke)) - noinvoke = 0; - close(pfd[0]); - - pid = waitpid(pid, &status, 0); - if (pid == -1) - err("waitpid: %s", strerror(errno)); - - /* - * If we couldn't invoke the utility or the utility didn't exit - * properly, quit with 127 or 126 respectively. - */ - if (noinvoke) - exit(noinvoke); - - /* - * According to POSIX, we have to exit if the utility exits with - * a 255 status, or is interrupted by a signal. xargs is allowed - * to return any exit status between 1 and 125 in these cases, but - * we'll use 124 and 125, the same values used by GNU xargs. - */ - if (WIFEXITED(status)) { - if (WEXITSTATUS (status) == 255) { - fprintf (stderr, "xargs: %s exited with status 255\n", - argv[0]); - exit(124); - } else if (WEXITSTATUS (status) != 0) { - exit_status = 123; - } - } else if (WIFSTOPPED (status)) { - fprintf (stderr, "xargs: %s terminated by signal %d\n", - argv[0], WSTOPSIG (status)); - exit(125); - } else if (WIFSIGNALED (status)) { - fprintf (stderr, "xargs: %s terminated by signal %d\n", - argv[0], WTERMSIG (status)); - exit(125); - } -} - -void usage(void) -{ - (void)fprintf(stderr, -"usage: xargs [-t0] [[-x] -n number] [-s size] [utility [argument ...]]\n"); - exit(1); -} - -void err(const char *fmt, ...) -{ - va_list ap; - - va_start(ap, fmt); - (void)fprintf(stderr, "xargs: "); - (void)vfprintf(stderr, fmt, ap); - va_end(ap); - (void)fprintf(stderr, "\n"); - exit(1); - /* NOTREACHED */ -} diff --git a/man/man1/Makefile b/man/man1/Makefile index 206158ae0..e109aa106 100644 --- a/man/man1/Makefile +++ b/man/man1/Makefile @@ -21,7 +21,7 @@ MAN= ash.1 at.1 \ term.1 termcap.1 tget.1 time.1 tr.1 true.1 \ truncate.1 tty.1 umount.1 uname.1 \ uud.1 uue.1 vol.1 whereis.1 which.1 \ - write.1 xargs.1 yap.1 linkfarm.1 pkg_view.1 + write.1 yap.1 linkfarm.1 pkg_view.1 MLINKS += ash.1 sh.1 MLINKS += ash.1 ..1 diff --git a/man/man1/xargs.1 b/man/man1/xargs.1 deleted file mode 100644 index 7e69847d2..000000000 --- a/man/man1/xargs.1 +++ /dev/null @@ -1,161 +0,0 @@ -.\" Copyright (c) 1990 The Regents of the University of California. -.\" All rights reserved. -.\" -.\" This code is derived from software contributed to Berkeley by -.\" John B. Roll Jr. and the Institute of Electrical and Electronics -.\" Engineers, Inc. -.\" -.\" Redistribution and use in source and binary forms, with or without -.\" modification, are permitted provided that the following conditions -.\" are met: -.\" 1. Redistributions of source code must retain the above copyright -.\" notice, this list of conditions and the following disclaimer. -.\" 2. Redistributions in binary form must reproduce the above copyright -.\" notice, this list of conditions and the following disclaimer in the -.\" documentation and/or other materials provided with the distribution. -.\" 3. All advertising materials mentioning features or use of this software -.\" must display the following acknowledgement: -.\" This product includes software developed by the University of -.\" California, Berkeley and its contributors. -.\" 4. Neither the name of the University nor the names of its contributors -.\" may be used to endorse or promote products derived from this software -.\" without specific prior written permission. -.\" -.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND -.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE -.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -.\" SUCH DAMAGE. -.\" -.\" @(#)xargs.1 5.5 (Berkeley) 6/27/91 -.\" -.TH XARGS 1 "June 27, 1991" -.UC 7 -.SH NAME -xargs \- construct argument list(s) and execute utility. -.SH SYNOPSIS -.B xargs -.RB [ \-ft0 ] -.RB [[ \-x ] -.B \-n -.IR number ] -.RB [ \-s -.IR size ] -.RI [ utility -.RI [ argument " ...]]" -.SH DESCRIPTION -The -.B xargs -utility reads space, tab, newline and end-of-file delimited arguments -from the standard input and executes the specified -.I utility -with them as arguments. -.PP -The utility and any arguments specified on the command line are given -to the -.I utility -upon each invocation, followed by some number of the arguments read -from standard input. -The -.I utility -is repeatedly executed until standard input is exhausted. -.PP -Spaces, tabs and newlines may be embedded in arguments using single (`` ' '') -or double (``"'') quotes or backslashes (``\e''). -Single quotes escape all non-single quote characters, excluding newlines, -up to the matching single quote. -Double quotes escape all non-double quote characters, excluding newlines, -up to the matching double quote. -Any single character, including newlines, may be escaped by a backslash. -.PP -The options are as follows: -.TP -.BI \-n " number" -Set the maximum number of arguments taken from standard input for each -invocation of the utility. -An invocation of -.I utility -will use less than -.I number -standard input arguments if the number of bytes accumulated (see the -.I \-s -option) exceeds the specified -.I size -or there are fewer than -.I number -arguments remaining for the last invocation of -.IR utility . -The current default value for -.I number -is 5000. -.TP -.BI \-s " size" -Set the maximum number of bytes for the command line length provided to -.IR utility . -The sum of the length of the utility name and the arguments passed to -.I utility -(including NULL terminators) will be less than or equal to this number. -The current default value for -.I size -is ARG_MAX - 2048. -.TP -.B \-t -Echo the command to be executed to standard error immediately before it -is executed. -.TP -.B \-x -Force -.B xargs -to terminate immediately if a command line containing -.I number -arguments will not fit in the specified (or default) command line length. -.TP -.B \-0 -Read null-byte terminated pathnames from standard input as may have been -produced by the -.B \-print0 -option of -.BR find (1). -This is a MINIX 3 specific extension to -.BR xargs . -.PP -If no -.I utility -is specified, -.BR echo (1) -is used. -.PP -Undefined behavior may occur if -.I utility -reads from the standard input. -.PP -.B Xargs -exits with an exit status of 0 if no error occurs. -If -.I utility -cannot be invoked, is terminated by a signal or terminates without -calling -.BR exit (2), -.B xargs -exits with an exit status of 127. -If -.I utility -exits with an exit status other than 0, -.B xargs -exits with that exit status. -Otherwise, -.B xargs -exits with an exit status of 1. -.SH "SEE ALSO" -.BR echo (1), -.BR find (1). -.SH STANDARDS -The -.B xargs -utility is expected to be POSIX 1003.2 compliant. diff --git a/usr.bin/Makefile b/usr.bin/Makefile index 9eb86975e..5b7e0dad3 100644 --- a/usr.bin/Makefile +++ b/usr.bin/Makefile @@ -31,7 +31,7 @@ SUBDIR= \ uniq \ \ wc whatis who \ - xinstall yes + xargs xinstall yes .if !defined(__MINIX) SUBDIR+= ../external/zlib/pigz/bin/pigz diff --git a/usr.bin/xargs/Makefile b/usr.bin/xargs/Makefile new file mode 100644 index 000000000..46b6fd3d8 --- /dev/null +++ b/usr.bin/xargs/Makefile @@ -0,0 +1,7 @@ +# $NetBSD: Makefile,v 1.5 2009/04/14 22:15:29 lukem Exp $ +# @(#)Makefile 8.1 (Berkeley) 6/6/93 + +PROG= xargs +SRCS= xargs.c strnsubst.c + +.include diff --git a/usr.bin/xargs/pathnames.h b/usr.bin/xargs/pathnames.h new file mode 100644 index 000000000..3f05b3dcc --- /dev/null +++ b/usr.bin/xargs/pathnames.h @@ -0,0 +1,36 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)pathnames.h 8.1 (Berkeley) 6/6/93 + */ + +#define _PATH_ECHO "/bin/echo" diff --git a/usr.bin/xargs/strnsubst.c b/usr.bin/xargs/strnsubst.c new file mode 100644 index 000000000..0953f49c4 --- /dev/null +++ b/usr.bin/xargs/strnsubst.c @@ -0,0 +1,115 @@ +/* $xMach: strnsubst.c,v 1.3 2002/02/23 02:10:24 jmallett Exp $ */ + +/* + * Copyright (c) 2002 J. Mallett. All rights reserved. + * You may do whatever you want with this file as long as + * the above copyright and this notice remain intact, along + * with the following statement: + * For the man who taught me vi, and who got too old, too young. + */ + +#include +#ifndef lint +#if 0 +__FBSDID("$FreeBSD: src/usr.bin/xargs/strnsubst.c,v 1.8 2005/12/30 23:22:50 jmallett Exp $"); +#endif +__RCSID("$NetBSD: strnsubst.c,v 1.1 2007/04/18 15:56:07 christos Exp $"); +#endif /* not lint */ + +#include +#include +#include +#include +#include + +void strnsubst(char **, const char *, const char *, size_t); + +/* + * Replaces str with a string consisting of str with match replaced with + * replstr as many times as can be done before the constructed string is + * maxsize bytes large. It does not free the string pointed to by str, it + * is up to the calling program to be sure that the original contents of + * str as well as the new contents are handled in an appropriate manner. + * If replstr is NULL, then that internally is changed to a nil-string, so + * that we can still pretend to do somewhat meaningful substitution. + * No value is returned. + */ +void +strnsubst(char **str, const char *match, const char *replstr, size_t maxsize) +{ + char *s1, *s2, *this; + + s1 = *str; + if (s1 == NULL) + return; + /* + * If maxsize is 0 then set it to to the length of s1, because we have + * to duplicate s1. XXX we maybe should double-check whether the match + * appears in s1. If it doesn't, then we also have to set the length + * to the length of s1, to avoid modifying the argument. It may make + * sense to check if maxsize is <= strlen(s1), because in that case we + * want to return the unmodified string, too. + */ + if (maxsize == 0) { + match = NULL; + maxsize = strlen(s1) + 1; + } + s2 = calloc(maxsize, 1); + if (s2 == NULL) + err(1, "calloc"); + + if (replstr == NULL) + replstr = ""; + + if (match == NULL || replstr == NULL || maxsize == strlen(s1)) { + (void)strlcpy(s2, s1, maxsize); + goto done; + } + + for (;;) { + this = strstr(s1, match); + if (this == NULL) + break; + if ((strlen(s2) + strlen(s1) + strlen(replstr) - + strlen(match) + 1) > maxsize) { + (void)strlcat(s2, s1, maxsize); + goto done; + } + (void)strncat(s2, s1, (uintptr_t)this - (uintptr_t)s1); + (void)strcat(s2, replstr); + s1 = this + strlen(match); + } + (void)strcat(s2, s1); +done: + *str = s2; + return; +} + +#ifdef TEST +#include + +int +main(void) +{ + char *x, *y, *z, *za; + + x = "{}%$"; + strnsubst(&x, "%$", "{} enpury!", 255); + y = x; + strnsubst(&y, "}{}", "ybir", 255); + z = y; + strnsubst(&z, "{", "v ", 255); + za = z; + strnsubst(&z, NULL, za, 255); + if (strcmp(z, "v ybir enpury!") == 0) + (void)printf("strnsubst() seems to work!\n"); + else + (void)printf("strnsubst() is broken.\n"); + (void)printf("%s\n", z); + free(x); + free(y); + free(z); + free(za); + return 0; +} +#endif diff --git a/usr.bin/xargs/xargs.1 b/usr.bin/xargs/xargs.1 new file mode 100644 index 000000000..d69383860 --- /dev/null +++ b/usr.bin/xargs/xargs.1 @@ -0,0 +1,387 @@ +.\" $NetBSD: xargs.1,v 1.23 2012/10/13 14:18:17 njoly Exp $ +.\" +.\" Copyright (c) 1990, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" John B. Roll Jr. and the Institute of Electrical and Electronics +.\" Engineers, Inc. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 3. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)xargs.1 8.1 (Berkeley) 6/6/93 +.\" $FreeBSD: src/usr.bin/xargs/xargs.1,v 1.40 2010/12/11 08:32:16 joel Exp $ +.\" $xMach: xargs.1,v 1.2 2002/02/23 05:23:37 tim Exp $ +.\" +.Dd December 21, 2010 +.Dt XARGS 1 +.Os +.Sh NAME +.Nm xargs +.Nd "construct argument list(s) and execute utility" +.Sh SYNOPSIS +.Nm +.Op Fl 0oprt +.Op Fl E Ar eofstr +.Oo +.Fl I Ar replstr +.Op Fl R Ar replacements +.Op Fl S Ar replsize +.Oc +.Op Fl J Ar replstr +.Op Fl L Ar number +.Oo +.Fl n Ar number +.Op Fl x +.Oc +.Op Fl P Ar maxprocs +.Op Fl s Ar size +.Op Ar utility Op Ar argument ... +.Sh DESCRIPTION +The +.Nm +utility reads space, tab, newline and end-of-file delimited strings +from the standard input and executes +.Ar utility +with the strings as +arguments. +.Pp +Any arguments specified on the command line are given to +.Ar utility +upon each invocation, followed by some number of the arguments read +from the standard input of +.Nm . +This is repeated until standard input is exhausted. +.Pp +Spaces, tabs and newlines may be embedded in arguments using single +(``\ '\ '') +or double (``"'') quotes or backslashes (``\e''). +Single quotes escape all non-single quote characters, excluding newlines, +up to the matching single quote. +Double quotes escape all non-double quote characters, excluding newlines, +up to the matching double quote. +Any single character, including newlines, may be escaped by a backslash. +.Pp +The options are as follows: +.Bl -tag -width indent +.It Fl 0 +Change +.Nm +to expect NUL +(``\e0'') +characters as separators, instead of spaces and newlines. +This is expected to be used in concert with the +.Fl print0 +function in +.Xr find 1 . +.It Fl E Ar eofstr +Use +.Ar eofstr +as a logical EOF marker. +.It Fl I Ar replstr +Execute +.Ar utility +for each input line, replacing one or more occurrences of +.Ar replstr +in up to +.Ar replacements +(or 5 if no +.Fl R +flag is specified) arguments to +.Ar utility +with the entire line of input. +The resulting arguments, after replacement is done, will not be allowed to grow +beyond +.Ar replsize +(or 255 if no +.Fl S +flag is specified) +bytes; this is implemented by concatenating as much of the argument +containing +.Ar replstr +as possible, to the constructed arguments to +.Ar utility , +up to +.Ar replsize +bytes. +The size limit does not apply to arguments to +.Ar utility +which do not contain +.Ar replstr , +and furthermore, no replacement will be done on +.Ar utility +itself. +Implies +.Fl x . +.It Fl J Ar replstr +If this option is specified, +.Nm +will use the data read from standard input to replace the first occurrence of +.Ar replstr +instead of appending that data after all other arguments. +This option will not affect how many arguments will be read from input +.Pq Fl n , +or the size of the command(s) +.Nm +will generate +.Pq Fl s . +The option just moves where those arguments will be placed in the command(s) +that are executed. +The +.Ar replstr +must show up as a distinct +.Ar argument +to +.Nm . +It will not be recognized if, for instance, it is in the middle of a +quoted string. +Furthermore, only the first occurrence of the +.Ar replstr +will be replaced. +For example, the following command will copy the list of files and +directories which start with an uppercase letter in the current +directory to +.Pa destdir : +.Pp +.Dl /bin/ls -1d [A-Z]* | xargs -J % cp -rp % destdir +.It Fl L Ar number +Call +.Ar utility +for every +.Ar number +lines read. +If EOF is reached and fewer lines have been read than +.Ar number +then +.Ar utility +will be called with the available lines. +.It Fl n Ar number +Set the maximum number of arguments taken from standard input for each +invocation of +.Ar utility . +An invocation of +.Ar utility +will use less than +.Ar number +standard input arguments if the number of bytes accumulated (see the +.Fl s +option) exceeds the specified +.Ar size +or there are fewer than +.Ar number +arguments remaining for the last invocation of +.Ar utility . +The current default value for +.Ar number +is 5000. +.It Fl o +Reopen stdin as +.Pa /dev/tty +in the child process before executing the command. +This is useful if you want +.Nm +to run an interactive application. +.It Fl P Ar maxprocs +Parallel mode: run at most +.Ar maxprocs +invocations of +.Ar utility +at once. +.It Fl p +Echo each command to be executed and ask the user whether it should be +executed. +An affirmative response, +.Ql y +in the POSIX locale, +causes the command to be executed, any other response causes it to be +skipped. +No commands are executed if the process is not attached to a terminal. +.It Fl r +Compatibility with GNU +.Nm . +The GNU version of +.Nm +runs the +.Ar utility +argument at least once, even if +.Nm +input is empty, and it supports a +.Fl r +option to inhibit this behavior. +The +.Nx +version of +.Nm +does not run the +.Ar utility +argument on empty input, but it supports the +.Fl r +option for command-line compatibility with GNU +.Nm ; +but the +.Fl r +option does nothing in the +.Nx +version of +.Nm . +.It Fl R Ar replacements +Specify the maximum number of arguments that +.Fl I +will do replacement in. +If +.Ar replacements +is negative, the number of arguments in which to replace is unbounded. +.It Fl S Ar replsize +Specify the amount of space (in bytes) that +.Fl I +can use for replacements. +The default for +.Ar replsize +is 255. +.It Fl s Ar size +Set the maximum number of bytes for the command line length provided to +.Ar utility . +The sum of the length of the utility name, the arguments passed to +.Ar utility +(including +.Dv NULL +terminators) and the current environment will be less than or equal to +this number. +The current default value for +.Ar size +is +.Dv ARG_MAX +- 4096. +.It Fl t +Echo the command to be executed to standard error immediately before it +is executed. +.It Fl x +Force +.Nm +to terminate immediately if a command line containing +.Ar number +arguments will not fit in the specified (or default) command line length. +.El +.Pp +If +.Ar utility +is omitted, +.Xr echo 1 +is used. +.Pp +Undefined behavior may occur if +.Ar utility +reads from the standard input. +.Pp +The +.Nm +utility exits immediately (without processing any further input) if a +command line cannot be assembled, +.Ar utility +cannot be invoked, an invocation of +.Ar utility +is terminated by a signal, +or an invocation of +.Ar utility +exits with a value of 255. +.Sh FILES +.Bl -tag -width /dev/tty -compact +.It Pa /dev/tty +used to read responses in prompt mode +.El +.Sh EXIT STATUS +.Nm +exits with one of the following values: +.Bl -tag -width Ds -compact +.It 0 +All invocations of +.Ar utility +returned a zero exit status. +.It 123 +One or more invocations of +.Ar utility +returned a nonzero exit status. +.It 124 +The +.Ar utility +exited with a 255 exit status. +.It 125 +The +.Ar utility +was killed or stopped by a signal. +.It 126 +The +.Ar utility +was found but could not be invoked. +.It 127 +The +.Ar utility +could not be found. +.It 1 +Some other error occurred. +.El +.Sh SEE ALSO +.Xr echo 1 , +.Xr find 1 , +.Xr execvp 3 +.Sh STANDARDS +The +.Nm +utility is expected to be +.St -p1003.2 +compliant. +The +.Fl J , o , P , R , +and +.Fl S +options are non-standard +.Fx +extensions which may not be available on other operating systems. +.Sh HISTORY +The +.Nm +utility appeared in PWB UNIX 1.0. +It made its first BSD appearance in the 4.3 Reno release. +.Pp +The meaning of 123, 124, and 125 exit values and the +.Fl 0 +option were taken from GNU xargs. +.Sh BUGS +If +.Ar utility +attempts to invoke another command such that the number of arguments or the +size of the environment is increased, it risks +.Xr execvp 3 +failing with +.Er E2BIG . +.Pp +The +.Nm +utility does not take multibyte characters into account when performing +string comparisons for the +.Fl I +and +.Fl J +options, which may lead to incorrect results in some locales. diff --git a/usr.bin/xargs/xargs.c b/usr.bin/xargs/xargs.c new file mode 100644 index 000000000..5c8937763 --- /dev/null +++ b/usr.bin/xargs/xargs.c @@ -0,0 +1,652 @@ +/* $NetBSD: xargs.c,v 1.20 2010/12/17 11:32:57 plunky Exp $ */ + +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * John B. Roll Jr. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $xMach: xargs.c,v 1.6 2002/02/23 05:27:47 tim Exp $ + */ + +#include +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1990, 1993\ + The Regents of the University of California. All rights reserved."); +#if 0 +static char sccsid[] = "@(#)xargs.c 8.1 (Berkeley) 6/6/93"; +__FBSDID("$FreeBSD: src/usr.bin/xargs/xargs.c,v 1.62 2006/01/01 22:59:54 jmallett Exp $"); +#endif +__RCSID("$NetBSD: xargs.c,v 1.20 2010/12/17 11:32:57 plunky Exp $"); +#endif /* not lint */ + +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "pathnames.h" + +static void parse_input(int, char *[]); +static void prerun(int, char *[]); +static int prompt(void); +static void run(char **); +static void usage(void) __dead; +void strnsubst(char **, const char *, const char *, size_t); +static void waitchildren(const char *, int); + +static char echo[] = _PATH_ECHO; +static char **av, **bxp, **ep, **endxp, **xp; +static char *argp, *bbp, *ebp, *inpline, *p, *replstr; +static const char *eofstr; +static int count, insingle, indouble, oflag, pflag, tflag, Rflag, rval, zflag; +static int cnt, Iflag, jfound, Lflag, Sflag, wasquoted, xflag; +static int curprocs, maxprocs; + +static volatile int childerr; + +extern char **environ; + +int +main(int argc, char *argv[]) +{ + long arg_max; + int ch, Jflag, nargs, nflag, nline; + size_t linelen; + char *endptr; + + setprogname(argv[0]); + + inpline = replstr = NULL; + ep = environ; + eofstr = ""; + Jflag = nflag = 0; + + (void)setlocale(LC_ALL, ""); + + /* + * SUSv3 says of the exec family of functions: + * The number of bytes available for the new process' + * combined argument and environment lists is {ARG_MAX}. It + * is implementation-defined whether null terminators, + * pointers, and/or any alignment bytes are included in this + * total. + * + * SUSv3 says of xargs: + * ... the combined argument and environment lists ... + * shall not exceed {ARG_MAX}-2048. + * + * To be conservative, we use ARG_MAX - 4K, and we do include + * nul terminators and pointers in the calculation. + * + * Given that the smallest argument is 2 bytes in length, this + * means that the number of arguments is limited to: + * + * (ARG_MAX - 4K - LENGTH(env + utility + arguments)) / 2. + * + * We arbitrarily limit the number of arguments to 5000. This is + * allowed by POSIX.2 as long as the resulting minimum exec line is + * at least LINE_MAX. Realloc'ing as necessary is possible, but + * probably not worthwhile. + */ + nargs = 5000; + if ((arg_max = sysconf(_SC_ARG_MAX)) == -1) + errx(1, "sysconf(_SC_ARG_MAX) failed"); + nline = arg_max - 4 * 1024; + while (*ep != NULL) { + /* 1 byte for each '\0' */ + nline -= strlen(*ep++) + 1 + sizeof(*ep); + } + maxprocs = 1; + while ((ch = getopt(argc, argv, "0E:I:J:L:n:oP:pR:S:s:rtx")) != -1) + switch (ch) { + case 'E': + eofstr = optarg; + break; + case 'I': + Jflag = 0; + Iflag = 1; + Lflag = 1; + replstr = optarg; + break; + case 'J': + Iflag = 0; + Jflag = 1; + replstr = optarg; + break; + case 'L': + Lflag = atoi(optarg); + break; + case 'n': + nflag = 1; + if ((nargs = atoi(optarg)) <= 0) + errx(1, "illegal argument count"); + break; + case 'o': + oflag = 1; + break; + case 'P': + if ((maxprocs = atoi(optarg)) <= 0) + errx(1, "max. processes must be >0"); + break; + case 'p': + pflag = 1; + break; + case 'R': + Rflag = strtol(optarg, &endptr, 10); + if (*endptr != '\0') + errx(1, "replacements must be a number"); + break; + case 'r': + /* GNU compatibility */ + break; + case 'S': + Sflag = strtoul(optarg, &endptr, 10); + if (*endptr != '\0') + errx(1, "replsize must be a number"); + break; + case 's': + nline = atoi(optarg); + break; + case 't': + tflag = 1; + break; + case 'x': + xflag = 1; + break; + case '0': + zflag = 1; + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (!Iflag && Rflag) + usage(); + if (!Iflag && Sflag) + usage(); + if (Iflag && !Rflag) + Rflag = 5; + if (Iflag && !Sflag) + Sflag = 255; + if (xflag && !nflag) + usage(); + if (Iflag || Lflag) + xflag = 1; + if (replstr != NULL && *replstr == '\0') + errx(1, "replstr may not be empty"); + + /* + * Allocate pointers for the utility name, the utility arguments, + * the maximum arguments to be read from stdin and the trailing + * NULL. + */ + linelen = 1 + argc + nargs + 1; + if ((av = bxp = malloc(linelen * sizeof(char **))) == NULL) + errx(1, "malloc failed"); + + /* + * Use the user's name for the utility as argv[0], just like the + * shell. Echo is the default. Set up pointers for the user's + * arguments. + */ + if (*argv == NULL) + cnt = strlen(*bxp++ = echo); + else { + do { + if (Jflag && strcmp(*argv, replstr) == 0) { + char **avj; + jfound = 1; + argv++; + for (avj = argv; *avj; avj++) + cnt += strlen(*avj) + 1; + break; + } + cnt += strlen(*bxp++ = *argv) + 1; + } while (*++argv != NULL); + } + + /* + * Set up begin/end/traversing pointers into the array. The -n + * count doesn't include the trailing NULL pointer, so the malloc + * added in an extra slot. + */ + endxp = (xp = bxp) + nargs; + + /* + * Allocate buffer space for the arguments read from stdin and the + * trailing NULL. Buffer space is defined as the default or specified + * space, minus the length of the utility name and arguments. Set up + * begin/end/traversing pointers into the array. The -s count does + * include the trailing NULL, so the malloc didn't add in an extra + * slot. + */ + nline -= cnt; + if (nline <= 0) + errx(1, "insufficient space for command"); + + if ((bbp = malloc((size_t)(nline + 1))) == NULL) + errx(1, "malloc failed"); + ebp = (argp = p = bbp) + nline - 1; + for (;;) + parse_input(argc, argv); +} + +static void +parse_input(int argc, char *argv[]) +{ + int ch, foundeof; + char **avj; + + foundeof = 0; + + switch (ch = getchar()) { + case EOF: + /* No arguments since last exec. */ + if (p == bbp) { + waitchildren(*argv, 1); + exit(rval); + } + goto arg1; + case ' ': + case '\t': + /* Quotes escape tabs and spaces. */ + if (insingle || indouble || zflag) + goto addch; + goto arg2; + case '\0': + if (zflag) { + /* + * Increment 'count', so that nulls will be treated + * as end-of-line, as well as end-of-argument. This + * is needed so -0 works properly with -I and -L. + */ + count++; + goto arg2; + } + goto addch; + case '\n': + if (zflag) + goto addch; + count++; /* Indicate end-of-line (used by -L) */ + + /* Quotes do not escape newlines. */ +arg1: if (insingle || indouble) + errx(1, "unterminated quote"); +arg2: + foundeof = *eofstr != '\0' && + strncmp(argp, eofstr, (size_t)(p - argp)) == 0; + + /* Do not make empty args unless they are quoted */ + if ((argp != p || wasquoted) && !foundeof) { + *p++ = '\0'; + *xp++ = argp; + if (Iflag) { + size_t curlen; + + if (inpline == NULL) + curlen = 0; + else { + /* + * If this string is not zero + * length, append a space for + * separation before the next + * argument. + */ + if ((curlen = strlen(inpline)) != 0) + (void)strcat(inpline, " "); + } + curlen++; + /* + * Allocate enough to hold what we will + * be holding in a second, and to append + * a space next time through, if we have + * to. + */ + inpline = realloc(inpline, curlen + 2 + + strlen(argp)); + if (inpline == NULL) + errx(1, "realloc failed"); + if (curlen == 1) + (void)strcpy(inpline, argp); + else + (void)strcat(inpline, argp); + } + } + + /* + * If max'd out on args or buffer, or reached EOF, + * run the command. If xflag and max'd out on buffer + * but not on args, object. Having reached the limit + * of input lines, as specified by -L is the same as + * maxing out on arguments. + */ + if (xp == endxp || p > ebp || ch == EOF || + (Lflag <= count && xflag) || foundeof) { + if (xflag && xp != endxp && p > ebp) + errx(1, "insufficient space for arguments"); + if (jfound) { + for (avj = argv; *avj; avj++) + *xp++ = *avj; + } + prerun(argc, av); + if (ch == EOF || foundeof) { + waitchildren(*argv, 1); + exit(rval); + } + p = bbp; + xp = bxp; + count = 0; + } + argp = p; + wasquoted = 0; + break; + case '\'': + if (indouble || zflag) + goto addch; + insingle = !insingle; + wasquoted = 1; + break; + case '"': + if (insingle || zflag) + goto addch; + indouble = !indouble; + wasquoted = 1; + break; + case '\\': + if (zflag) + goto addch; + /* Backslash escapes anything, is escaped by quotes. */ + if (!insingle && !indouble && (ch = getchar()) == EOF) + errx(1, "backslash at EOF"); + /* FALLTHROUGH */ + default: +addch: if (p < ebp) { + *p++ = ch; + break; + } + + /* If only one argument, not enough buffer space. */ + if (bxp == xp) + errx(1, "insufficient space for argument"); + /* Didn't hit argument limit, so if xflag object. */ + if (xflag) + errx(1, "insufficient space for arguments"); + + if (jfound) { + for (avj = argv; *avj; avj++) + *xp++ = *avj; + } + prerun(argc, av); + xp = bxp; + cnt = ebp - argp; + (void)memcpy(bbp, argp, (size_t)cnt); + p = (argp = bbp) + cnt; + *p++ = ch; + break; + } +} + +/* + * Do things necessary before run()'ing, such as -I substitution, + * and then call run(). + */ +static void +prerun(int argc, char *argv[]) +{ + char **tmp, **tmp2, **avj; + int repls; + + repls = Rflag; + + if (argc == 0 || repls == 0) { + *xp = NULL; + run(argv); + return; + } + + avj = argv; + + /* + * Allocate memory to hold the argument list, and + * a NULL at the tail. + */ + tmp = malloc((argc + 1) * sizeof(char**)); + if (tmp == NULL) + errx(1, "malloc failed"); + tmp2 = tmp; + + /* + * Save the first argument and iterate over it, we + * cannot do strnsubst() to it. + */ + if ((*tmp++ = strdup(*avj++)) == NULL) + errx(1, "strdup failed"); + + /* + * For each argument to utility, if we have not used up + * the number of replacements we are allowed to do, and + * if the argument contains at least one occurrence of + * replstr, call strnsubst(), else just save the string. + * Iterations over elements of avj and tmp are done + * where appropriate. + */ + while (--argc) { + *tmp = *avj++; + if (repls && strstr(*tmp, replstr) != NULL) { + strnsubst(tmp++, replstr, inpline, (size_t)Sflag); + if (repls > 0) + repls--; + } else { + if ((*tmp = strdup(*tmp)) == NULL) + errx(1, "strdup failed"); + tmp++; + } + } + + /* + * Run it. + */ + *tmp = NULL; + run(tmp2); + + /* + * Walk from the tail to the head, free along the way. + */ + for (; tmp2 != tmp; tmp--) + free(*tmp); + /* + * Now free the list itself. + */ + free(tmp2); + + /* + * Free the input line buffer, if we have one. + */ + if (inpline != NULL) { + free(inpline); + inpline = NULL; + } +} + +static void +run(char **argv) +{ + int fd; + char **avec; + + /* + * If the user wants to be notified of each command before it is + * executed, notify them. If they want the notification to be + * followed by a prompt, then prompt them. + */ + if (tflag || pflag) { + (void)fprintf(stderr, "%s", *argv); + for (avec = argv + 1; *avec != NULL; ++avec) + (void)fprintf(stderr, " %s", *avec); + /* + * If the user has asked to be prompted, do so. + */ + if (pflag) + /* + * If they asked not to exec, return without execution + * but if they asked to, go to the execution. If we + * could not open their tty, break the switch and drop + * back to -t behaviour. + */ + switch (prompt()) { + case 0: + return; + case 1: + goto exec; + case 2: + break; + } + (void)fprintf(stderr, "\n"); + (void)fflush(stderr); + } +exec: + childerr = 0; + switch (vfork()) { + case -1: + err(1, "vfork"); + /*NOTREACHED*/ + case 0: + if (oflag) { + if ((fd = open(_PATH_TTY, O_RDONLY)) == -1) + err(1, "can't open /dev/tty"); + } else { + fd = open(_PATH_DEVNULL, O_RDONLY); + } + if (fd > STDIN_FILENO) { + if (dup2(fd, STDIN_FILENO) != 0) + err(1, "can't dup2 to stdin"); + (void)close(fd); + } + (void)execvp(argv[0], argv); + childerr = errno; + _exit(1); + } + curprocs++; + waitchildren(*argv, 0); +} + +static void +waitchildren(const char *name, int waitall) +{ + pid_t pid; + int status; + + while ((pid = waitpid(-1, &status, !waitall && curprocs < maxprocs ? + WNOHANG : 0)) > 0) { + curprocs--; + /* If we couldn't invoke the utility, exit. */ + if (childerr != 0) { + errno = childerr; + err(errno == ENOENT ? 127 : 126, "%s", name); + } + /* + * According to POSIX, we have to exit if the utility exits + * with a 255 status, or is interrupted by a signal. xargs + * is allowed to return any exit status between 1 and 125 + * in these cases, but we'll use 124 and 125, the same + * values used by GNU xargs. + */ + if (WIFEXITED(status)) { + if (WEXITSTATUS (status) == 255) { + warnx ("%s exited with status 255", name); + exit(124); + } else if (WEXITSTATUS (status) != 0) { + rval = 123; + } + } else if (WIFSIGNALED (status)) { + if (WTERMSIG(status) < NSIG) { + warnx("%s terminated by SIG%s", name, + sys_signame[WTERMSIG(status)]); + } else { + warnx("%s terminated by signal %d", name, + WTERMSIG(status)); + } + exit(125); + } + } + if (pid == -1 && errno != ECHILD) + err(1, "waitpid"); +} + +/* + * Prompt the user about running a command. + */ +static int +prompt(void) +{ + regex_t cre; + size_t rsize; + int match; + char *response; + FILE *ttyfp; + + if ((ttyfp = fopen(_PATH_TTY, "r")) == NULL) + return (2); /* Indicate that the TTY failed to open. */ + (void)fprintf(stderr, "?..."); + (void)fflush(stderr); + if ((response = fgetln(ttyfp, &rsize)) == NULL || + regcomp(&cre, nl_langinfo(YESEXPR), REG_BASIC) != 0) { + (void)fclose(ttyfp); + return (0); + } + response[rsize - 1] = '\0'; + match = regexec(&cre, response, 0, NULL, 0); + (void)fclose(ttyfp); + regfree(&cre); + return (match == 0); +} + +static void +usage(void) +{ + (void)fprintf(stderr, +"Usage: %s [-0opt] [-E eofstr] [-I replstr [-R replacements] [-S replsize]]\n" +" [-J replstr] [-L number] [-n number [-x]] [-P maxprocs]\n" +" [-s size] [utility [argument ...]]\n", getprogname()); + exit(1); +}