1 | /*-
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2 | * Copyright (c) 1990 The Regents of the University of California.
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3 | * All rights reserved.
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4 | *
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5 | * This code is derived from software contributed to Berkeley by
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6 | * John B. Roll Jr.
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7 | *
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8 | * Redistribution and use in source and binary forms, with or without
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9 | * modification, are permitted provided that the following conditions
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10 | * are met:
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11 | * 1. Redistributions of source code must retain the above copyright
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12 | * notice, this list of conditions and the following disclaimer.
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13 | * 2. Redistributions in binary form must reproduce the above copyright
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14 | * notice, this list of conditions and the following disclaimer in the
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15 | * documentation and/or other materials provided with the distribution.
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16 | * 3. All advertising materials mentioning features or use of this software
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17 | * must display the following acknowledgement:
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18 | * This product includes software developed by the University of
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19 | * California, Berkeley and its contributors.
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20 | * 4. Neither the name of the University nor the names of its contributors
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21 | * may be used to endorse or promote products derived from this software
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22 | * without specific prior written permission.
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23 | *
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24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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34 | * SUCH DAMAGE.
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35 | */
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36 |
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37 | #ifndef lint
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38 | char copyright[] =
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39 | "@(#) Copyright (c) 1990 The Regents of the University of California.\n\
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40 | All rights reserved.\n";
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41 | #endif /* not lint */
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42 |
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43 | #ifndef lint
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44 | static char sccsid[] = "@(#)xargs.c 5.11 (Berkeley) 6/19/91";
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45 | #endif /* not lint */
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46 |
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47 | #include <sys/types.h>
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48 | #include <sys/wait.h>
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49 | #include <errno.h>
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50 | #include <stdio.h>
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51 | #include <stdlib.h>
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52 | #include <string.h>
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53 | #include <unistd.h>
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54 | #include <limits.h>
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55 | #include <fcntl.h>
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56 | #include <stdarg.h>
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57 | #if __minix
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58 | #define _PATH_ECHO "/bin/echo"
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59 | #else
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60 | #include "pathnames.h"
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61 | #endif
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62 |
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63 | #ifndef ARG_MAX
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64 | #define ARG_MAX (sizeof(int) == 2 ? 4096 : 128 * 1024)
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65 | #endif
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66 |
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67 | int exit_status = 0;
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68 | int tflag;
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69 | void err(const char *, ...);
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70 | void run(char **argv);
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71 | void usage(void);
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72 |
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73 | int main(int argc, char **argv)
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74 | {
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75 | extern int optind;
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76 | extern char *optarg;
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77 | register int ch;
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78 | register char *p, *bbp, *ebp, **bxp, **exp, **xp;
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79 | int cnt, indouble, insingle, nargs, nflag, nline, xflag, zflag;
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80 | char **av, *argp;
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81 |
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82 | /*
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83 | * POSIX.2 limits the exec line length to ARG_MAX - 2K. Running that
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84 | * caused some E2BIG errors, so it was changed to ARG_MAX - 4K. Given
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85 | * that the smallest argument is 2 bytes in length, this means that
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86 | * the number of arguments is limited to:
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87 | *
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88 | * (ARG_MAX - 4K - LENGTH(utility + arguments)) / 2.
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89 | *
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90 | * We arbitrarily limit the number of arguments to 5000. This is
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91 | * allowed by POSIX.2 as long as the resulting minimum exec line is
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92 | * at least LINE_MAX. Realloc'ing as necessary is possible, but
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93 | * probably not worthwhile.
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94 | */
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95 | #if !__minix || __minix_vmd
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96 | nargs = 5000;
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97 | nline = ARG_MAX - 4 * 1024;
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98 | #else
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99 | /* Things are more cramped under standard Minix. */
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100 | nargs = 80 * sizeof(int);
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101 | nline = ARG_MAX - 512 * sizeof(int);
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102 | #endif
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103 | nflag = xflag = zflag = 0;
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104 | while ((ch = getopt(argc, argv, "n:s:tx0")) != EOF)
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105 | switch(ch) {
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106 | case 'n':
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107 | nflag = 1;
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108 | if ((nargs = atoi(optarg)) <= 0)
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109 | err("illegal argument count");
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110 | break;
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111 | case 's':
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112 | nline = atoi(optarg);
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113 | break;
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114 | case 't':
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115 | tflag = 1;
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116 | break;
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117 | case 'x':
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118 | xflag = 1;
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119 | break;
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120 | case '0':
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121 | zflag = 1;
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122 | break;
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123 | case '?':
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124 | default:
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125 | usage();
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126 | }
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127 | argc -= optind;
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128 | argv += optind;
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129 |
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130 | if (xflag && !nflag)
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131 | usage();
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132 |
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133 | /*
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134 | * Allocate pointers for the utility name, the utility arguments,
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135 | * the maximum arguments to be read from stdin and the trailing
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136 | * NULL.
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137 | */
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138 | if (!(av = bxp =
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139 | malloc((u_int)(1 + argc + nargs + 1) * sizeof(char **))))
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140 | err("%s", strerror(errno));
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141 |
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142 | /*
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143 | * Use the user's name for the utility as argv[0], just like the
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144 | * shell. Echo is the default. Set up pointers for the user's
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145 | * arguments.
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146 | */
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147 | if (!*argv)
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148 | cnt = strlen(*bxp++ = _PATH_ECHO);
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149 | else {
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150 | cnt = 0;
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151 | do {
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152 | cnt += strlen(*bxp++ = *argv) + 1;
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153 | } while (*++argv);
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154 | }
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155 |
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156 | /*
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157 | * Set up begin/end/traversing pointers into the array. The -n
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158 | * count doesn't include the trailing NULL pointer, so the malloc
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159 | * added in an extra slot.
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160 | */
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161 | exp = (xp = bxp) + nargs;
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162 |
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163 | /*
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164 | * Allocate buffer space for the arguments read from stdin and the
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165 | * trailing NULL. Buffer space is defined as the default or specified
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166 | * space, minus the length of the utility name and arguments. Set up
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167 | * begin/end/traversing pointers into the array. The -s count does
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168 | * include the trailing NULL, so the malloc didn't add in an extra
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169 | * slot.
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170 | */
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171 | nline -= cnt;
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172 | if (nline <= 0)
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173 | err("insufficient space for command");
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174 |
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175 | if (!(bbp = malloc((u_int)nline + 1)))
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176 | err("%s", strerror(errno));
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177 | ebp = (argp = p = bbp) + nline - 1;
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178 |
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179 | if (zflag) {
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180 | /* Read pathnames terminated by null bytes as produced by
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181 | * find ... -print0. No comments in this code, see further
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182 | * below.
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183 | */
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184 | for (;;)
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185 | switch(ch = getchar()) {
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186 | case EOF:
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187 | if (p == bbp)
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188 | exit(exit_status);
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189 |
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190 | if (argp == p) {
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191 | *xp = NULL;
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192 | run(av);
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193 | exit(exit_status);
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194 | }
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195 | /*FALL THROUGH*/
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196 | case '\0':
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197 | if (argp == p)
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198 | continue;
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199 |
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200 | *p = '\0';
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201 | *xp++ = argp;
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202 |
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203 | if (xp == exp || p == ebp || ch == EOF) {
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204 | if (xflag && xp != exp && p == ebp)
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205 | err(
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206 | "insufficient space for arguments");
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207 | *xp = NULL;
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208 | run(av);
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209 | if (ch == EOF)
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210 | exit(exit_status);
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211 | p = bbp;
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212 | xp = bxp;
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213 | } else
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214 | ++p;
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215 | argp = p;
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216 | break;
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217 | default:
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218 | if (p < ebp) {
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219 | *p++ = ch;
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220 | break;
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221 | }
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222 |
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223 | if (bxp == xp)
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224 | err("insufficient space for argument");
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225 | if (xflag)
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226 | err("insufficient space for arguments");
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227 |
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228 | *xp = NULL;
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229 | run(av);
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230 | xp = bxp;
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231 | cnt = ebp - argp;
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232 | bcopy(argp, bbp, cnt);
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233 | p = (argp = bbp) + cnt;
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234 | *p++ = ch;
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235 | break;
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236 | }
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237 | /* NOTREACHED */
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238 | }
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239 |
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240 | for (insingle = indouble = 0;;)
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241 | switch(ch = getchar()) {
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242 | case EOF:
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243 | /* No arguments since last exec. */
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244 | if (p == bbp)
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245 | exit(exit_status);
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246 |
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247 | /* Nothing since end of last argument. */
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248 | if (argp == p) {
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249 | *xp = NULL;
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250 | run(av);
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251 | exit(exit_status);
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252 | }
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253 | goto arg1;
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254 | case ' ':
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255 | case '\t':
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256 | /* Quotes escape tabs and spaces. */
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257 | if (insingle || indouble)
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258 | goto addch;
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259 | goto arg2;
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260 | case '\n':
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261 | /* Empty lines are skipped. */
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262 | if (argp == p)
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263 | continue;
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264 |
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265 | /* Quotes do not escape newlines. */
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266 | arg1: if (insingle || indouble)
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267 | err("unterminated quote");
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268 |
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269 | arg2: *p = '\0';
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270 | *xp++ = argp;
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271 |
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272 | /*
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273 | * If max'd out on args or buffer, or reached EOF,
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274 | * run the command. If xflag and max'd out on buffer
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275 | * but not on args, object.
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276 | */
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277 | if (xp == exp || p == ebp || ch == EOF) {
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278 | if (xflag && xp != exp && p == ebp)
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279 | err("insufficient space for arguments");
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280 | *xp = NULL;
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281 | run(av);
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282 | if (ch == EOF)
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283 | exit(exit_status);
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284 | p = bbp;
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285 | xp = bxp;
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286 | } else
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287 | ++p;
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288 | argp = p;
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289 | break;
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290 | case '\'':
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291 | if (indouble)
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292 | goto addch;
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293 | insingle = !insingle;
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294 | break;
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295 | case '"':
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296 | if (insingle)
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297 | goto addch;
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298 | indouble = !indouble;
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299 | break;
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300 | case '\\':
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301 | /* Backslash escapes anything, is escaped by quotes. */
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302 | if (!insingle && !indouble && (ch = getchar()) == EOF)
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303 | err("backslash at EOF");
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304 | /* FALLTHROUGH */
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305 | default:
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306 | addch: if (p < ebp) {
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307 | *p++ = ch;
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308 | break;
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309 | }
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310 |
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311 | /* If only one argument, not enough buffer space. */
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312 | if (bxp == xp)
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313 | err("insufficient space for argument");
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314 | /* Didn't hit argument limit, so if xflag object. */
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315 | if (xflag)
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316 | err("insufficient space for arguments");
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317 |
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318 | *xp = NULL;
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319 | run(av);
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320 | xp = bxp;
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321 | cnt = ebp - argp;
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322 | bcopy(argp, bbp, cnt);
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323 | p = (argp = bbp) + cnt;
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324 | *p++ = ch;
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325 | break;
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326 | }
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327 | /* NOTREACHED */
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328 | }
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329 |
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330 | void run(char **argv)
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331 | {
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332 | register char **p;
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333 | pid_t pid;
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334 | int noinvoke;
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335 | int status;
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336 | int pfd[2];
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337 |
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338 | if (tflag) {
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339 | (void)fprintf(stderr, "%s", *argv);
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340 | for (p = argv + 1; *p; ++p)
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341 | (void)fprintf(stderr, " %s", *p);
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342 | (void)fprintf(stderr, "\n");
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343 | (void)fflush(stderr);
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344 | }
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345 | if (pipe(pfd) < 0) err("pipe: %s", strerror(errno));
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346 |
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347 | switch(pid = fork()) {
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348 | case -1:
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349 | err("fork: %s", strerror(errno));
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350 | case 0:
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351 | close(pfd[0]);
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352 | fcntl(pfd[1], F_SETFD, fcntl(pfd[1], F_GETFD) | FD_CLOEXEC);
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353 |
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354 | execvp(argv[0], argv);
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355 | noinvoke = (errno == ENOENT) ? 127 : 126;
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356 | (void)fprintf(stderr,
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357 | "xargs: %s exec failed: %s.\n", argv[0], strerror(errno));
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358 |
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359 | /* Modern way of returning noinvoke instead of a dirty vfork()
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360 | * trick: (kjb)
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361 | */
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362 | write(pfd[1], &noinvoke, sizeof(noinvoke));
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363 | _exit(-1);
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364 | }
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365 | close(pfd[1]);
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366 | if (read(pfd[0], &noinvoke, sizeof(noinvoke)) < sizeof(noinvoke))
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367 | noinvoke = 0;
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368 | close(pfd[0]);
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369 |
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370 | pid = waitpid(pid, &status, 0);
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371 | if (pid == -1)
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372 | err("waitpid: %s", strerror(errno));
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373 |
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374 | /*
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375 | * If we couldn't invoke the utility or the utility didn't exit
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376 | * properly, quit with 127 or 126 respectively.
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377 | */
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378 | if (noinvoke)
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379 | exit(noinvoke);
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380 |
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381 | /*
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382 | * According to POSIX, we have to exit if the utility exits with
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383 | * a 255 status, or is interrupted by a signal. xargs is allowed
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384 | * to return any exit status between 1 and 125 in these cases, but
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385 | * we'll use 124 and 125, the same values used by GNU xargs.
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386 | */
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387 | if (WIFEXITED(status)) {
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388 | if (WEXITSTATUS (status) == 255) {
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389 | fprintf (stderr, "xargs: %s exited with status 255\n",
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390 | argv[0]);
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391 | exit(124);
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392 | } else if (WEXITSTATUS (status) != 0) {
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393 | exit_status = 123;
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394 | }
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395 | } else if (WIFSTOPPED (status)) {
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396 | fprintf (stderr, "xargs: %s terminated by signal %d\n",
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397 | argv[0], WSTOPSIG (status));
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398 | exit(125);
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399 | } else if (WIFSIGNALED (status)) {
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400 | fprintf (stderr, "xargs: %s terminated by signal %d\n",
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401 | argv[0], WTERMSIG (status));
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402 | exit(125);
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403 | }
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404 | }
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405 |
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406 | void usage(void)
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407 | {
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408 | (void)fprintf(stderr,
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409 | "usage: xargs [-t0] [[-x] -n number] [-s size] [utility [argument ...]]\n");
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410 | exit(1);
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411 | }
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412 |
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413 | void err(const char *fmt, ...)
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414 | {
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415 | va_list ap;
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416 |
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417 | va_start(ap, fmt);
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418 | (void)fprintf(stderr, "xargs: ");
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419 | (void)vfprintf(stderr, fmt, ap);
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420 | va_end(ap);
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421 | (void)fprintf(stderr, "\n");
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422 | exit(1);
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423 | /* NOTREACHED */
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424 | }
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