1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Mini xargs implementation for busybox
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4 | *
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5 | * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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6 | *
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7 | * Special thanks
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8 | * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
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9 | * - Mike Rendell <michael@cs.mun.ca>
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10 | * and David MacKenzie <djm@gnu.ai.mit.edu>.
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11 | *
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12 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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13 | *
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14 | * xargs is described in the Single Unix Specification v3 at
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15 | * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
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16 | */
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17 |
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18 | //config:config XARGS
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19 | //config: bool "xargs"
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20 | //config: default y
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21 | //config: help
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22 | //config: xargs is used to execute a specified command for
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23 | //config: every item from standard input.
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24 | //config:
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25 | //config:config FEATURE_XARGS_SUPPORT_CONFIRMATION
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26 | //config: bool "Enable -p: prompt and confirmation"
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27 | //config: default y
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28 | //config: depends on XARGS
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29 | //config: help
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30 | //config: Support -p: prompt the user whether to run each command
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31 | //config: line and read a line from the terminal.
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32 | //config:
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33 | //config:config FEATURE_XARGS_SUPPORT_QUOTES
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34 | //config: bool "Enable single and double quotes and backslash"
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35 | //config: default y
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36 | //config: depends on XARGS
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37 | //config: help
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38 | //config: Support quoting in the input.
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39 | //config:
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40 | //config:config FEATURE_XARGS_SUPPORT_TERMOPT
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41 | //config: bool "Enable -x: exit if -s or -n is exceeded"
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42 | //config: default y
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43 | //config: depends on XARGS
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44 | //config: help
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45 | //config: Support -x: exit if the command size (see the -s or -n option)
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46 | //config: is exceeded.
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47 | //config:
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48 | //config:config FEATURE_XARGS_SUPPORT_ZERO_TERM
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49 | //config: bool "Enable -0: NUL-terminated input"
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50 | //config: default y
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51 | //config: depends on XARGS
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52 | //config: help
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53 | //config: Support -0: input items are terminated by a NUL character
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54 | //config: instead of whitespace, and the quotes and backslash
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55 | //config: are not special.
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56 | //config:
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57 | //config:config FEATURE_XARGS_SUPPORT_REPL_STR
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58 | //config: bool "Enable -I STR: string to replace"
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59 | //config: default y
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60 | //config: depends on XARGS
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61 | //config: help
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62 | //config: Support -I STR and -i[STR] options.
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63 |
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64 | //applet:IF_XARGS(APPLET_NOEXEC(xargs, xargs, BB_DIR_USR_BIN, BB_SUID_DROP, xargs))
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65 |
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66 | //kbuild:lib-$(CONFIG_XARGS) += xargs.o
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67 |
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68 | #include "libbb.h"
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69 | #include "common_bufsiz.h"
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70 |
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71 | /* This is a NOEXEC applet. Be very careful! */
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72 |
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73 |
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74 | //#define dbg_msg(...) bb_error_msg(__VA_ARGS__)
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75 | #define dbg_msg(...) ((void)0)
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76 |
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77 |
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78 | #ifdef TEST
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79 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
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80 | # define ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION 1
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81 | # endif
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82 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
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83 | # define ENABLE_FEATURE_XARGS_SUPPORT_QUOTES 1
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84 | # endif
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85 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
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86 | # define ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT 1
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87 | # endif
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88 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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89 | # define ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM 1
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90 | # endif
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91 | #endif
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92 |
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93 |
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94 | struct globals {
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95 | char **args;
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96 | #if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
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97 | char **argv;
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98 | const char *repl_str;
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99 | char eol_ch;
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100 | #endif
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101 | const char *eof_str;
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102 | int idx;
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103 | } FIX_ALIASING;
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104 | #define G (*(struct globals*)bb_common_bufsiz1)
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105 | #define INIT_G() do { \
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106 | setup_common_bufsiz(); \
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107 | G.eof_str = NULL; /* need to clear by hand because we are NOEXEC applet */ \
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108 | IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.repl_str = "{}";) \
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109 | IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.eol_ch = '\n';) \
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110 | } while (0)
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111 |
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112 |
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113 | static int xargs_exec(void)
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114 | {
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115 | int status;
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116 |
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117 | status = spawn_and_wait(G.args);
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118 | if (status < 0) {
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119 | bb_simple_perror_msg(G.args[0]);
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120 | return errno == ENOENT ? 127 : 126;
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121 | }
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122 | if (status == 255) {
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123 | bb_error_msg("%s: exited with status 255; aborting", G.args[0]);
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124 | return 124;
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125 | }
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126 | if (status >= 0x180) {
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127 | bb_error_msg("'%s' terminated by signal %d",
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128 | G.args[0], status - 0x180);
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129 | return 125;
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130 | }
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131 | if (status)
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132 | return 123;
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133 | return 0;
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134 | }
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135 |
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136 | /* In POSIX/C locale isspace is only these chars: "\t\n\v\f\r" and space.
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137 | * "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
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138 | */
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139 | #define ISSPACE(a) ({ unsigned char xargs__isspace = (a) - 9; xargs__isspace == (' ' - 9) || xargs__isspace <= (13 - 9); })
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140 |
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141 | static void store_param(char *s)
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142 | {
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143 | /* Grow by 256 elements at once */
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144 | if (!(G.idx & 0xff)) { /* G.idx == N*256 */
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145 | /* Enlarge, make G.args[(N+1)*256 - 1] last valid idx */
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146 | G.args = xrealloc(G.args, sizeof(G.args[0]) * (G.idx + 0x100));
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147 | }
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148 | G.args[G.idx++] = s;
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149 | }
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150 |
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151 | /* process[0]_stdin:
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152 | * Read characters into buf[n_max_chars+1], and when parameter delimiter
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153 | * is seen, store the address of a new parameter to args[].
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154 | * If reading discovers that last chars do not form the complete
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155 | * parameter, the pointer to the first such "tail character" is returned.
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156 | * (buf has extra byte at the end to accommodate terminating NUL
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157 | * of "tail characters" string).
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158 | * Otherwise, the returned pointer points to NUL byte.
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159 | * On entry, buf[] may contain some "seed chars" which are to become
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160 | * the beginning of the first parameter.
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161 | */
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162 |
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163 | #if ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
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164 | static char* FAST_FUNC process_stdin(int n_max_chars, int n_max_arg, char *buf)
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165 | {
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166 | #define NORM 0
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167 | #define QUOTE 1
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168 | #define BACKSLASH 2
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169 | #define SPACE 4
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170 | char q = '\0'; /* quote char */
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171 | char state = NORM;
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172 | char *s = buf; /* start of the word */
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173 | char *p = s + strlen(buf); /* end of the word */
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174 |
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175 | buf += n_max_chars; /* past buffer's end */
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176 |
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177 | /* "goto ret" is used instead of "break" to make control flow
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178 | * more obvious: */
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179 |
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180 | while (1) {
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181 | int c = getchar();
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182 | if (c == EOF) {
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183 | if (p != s)
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184 | goto close_word;
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185 | goto ret;
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186 | }
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187 | if (state == BACKSLASH) {
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188 | state = NORM;
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189 | goto set;
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190 | }
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191 | if (state == QUOTE) {
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192 | if (c != q)
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193 | goto set;
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194 | q = '\0';
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195 | state = NORM;
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196 | } else { /* if (state == NORM) */
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197 | if (ISSPACE(c)) {
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198 | if (p != s) {
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199 | close_word:
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200 | state = SPACE;
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201 | c = '\0';
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202 | goto set;
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203 | }
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204 | } else {
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205 | if (c == '\\') {
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206 | state = BACKSLASH;
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207 | } else if (c == '\'' || c == '"') {
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208 | q = c;
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209 | state = QUOTE;
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210 | } else {
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211 | set:
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212 | *p++ = c;
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213 | }
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214 | }
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215 | }
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216 | if (state == SPACE) { /* word's delimiter or EOF detected */
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217 | if (q) {
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218 | bb_error_msg_and_die("unmatched %s quote",
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219 | q == '\'' ? "single" : "double");
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220 | }
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221 | /* A full word is loaded */
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222 | if (G.eof_str) {
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223 | if (strcmp(s, G.eof_str) == 0) {
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224 | while (getchar() != EOF)
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225 | continue;
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226 | p = s;
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227 | goto ret;
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228 | }
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229 | }
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230 | store_param(s);
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231 | dbg_msg("args[]:'%s'", s);
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232 | s = p;
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233 | n_max_arg--;
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234 | if (n_max_arg == 0) {
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235 | goto ret;
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236 | }
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237 | state = NORM;
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238 | }
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239 | if (p == buf) {
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240 | goto ret;
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241 | }
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242 | }
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243 | ret:
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244 | *p = '\0';
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245 | /* store_param(NULL) - caller will do it */
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246 | dbg_msg("return:'%s'", s);
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247 | return s;
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248 | }
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249 | #else
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250 | /* The variant does not support single quotes, double quotes or backslash */
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251 | static char* FAST_FUNC process_stdin(int n_max_chars, int n_max_arg, char *buf)
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252 | {
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253 | char *s = buf; /* start of the word */
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254 | char *p = s + strlen(buf); /* end of the word */
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255 |
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256 | buf += n_max_chars; /* past buffer's end */
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257 |
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258 | while (1) {
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259 | int c = getchar();
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260 | if (c == EOF) {
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261 | if (p == s)
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262 | goto ret;
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263 | }
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264 | if (c == EOF || ISSPACE(c)) {
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265 | if (p == s)
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266 | continue;
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267 | c = EOF;
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268 | }
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269 | *p++ = (c == EOF ? '\0' : c);
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270 | if (c == EOF) { /* word's delimiter or EOF detected */
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271 | /* A full word is loaded */
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272 | if (G.eof_str) {
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273 | if (strcmp(s, G.eof_str) == 0) {
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274 | while (getchar() != EOF)
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275 | continue;
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276 | p = s;
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277 | goto ret;
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278 | }
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279 | }
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280 | store_param(s);
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281 | dbg_msg("args[]:'%s'", s);
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282 | s = p;
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283 | n_max_arg--;
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284 | if (n_max_arg == 0) {
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285 | goto ret;
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286 | }
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287 | }
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288 | if (p == buf) {
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289 | goto ret;
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290 | }
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291 | }
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292 | ret:
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293 | *p = '\0';
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294 | /* store_param(NULL) - caller will do it */
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295 | dbg_msg("return:'%s'", s);
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296 | return s;
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297 | }
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298 | #endif /* FEATURE_XARGS_SUPPORT_QUOTES */
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299 |
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300 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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301 | static char* FAST_FUNC process0_stdin(int n_max_chars, int n_max_arg, char *buf)
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302 | {
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303 | char *s = buf; /* start of the word */
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304 | char *p = s + strlen(buf); /* end of the word */
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305 |
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306 | buf += n_max_chars; /* past buffer's end */
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307 |
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308 | while (1) {
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309 | int c = getchar();
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310 | if (c == EOF) {
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311 | if (p == s)
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312 | goto ret;
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313 | c = '\0';
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314 | }
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315 | *p++ = c;
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316 | if (c == '\0') { /* NUL or EOF detected */
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317 | /* A full word is loaded */
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318 | store_param(s);
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319 | dbg_msg("args[]:'%s'", s);
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320 | s = p;
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321 | n_max_arg--;
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322 | if (n_max_arg == 0) {
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323 | goto ret;
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324 | }
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325 | }
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326 | if (p == buf) {
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327 | goto ret;
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328 | }
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329 | }
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330 | ret:
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331 | *p = '\0';
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332 | /* store_param(NULL) - caller will do it */
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333 | dbg_msg("return:'%s'", s);
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334 | return s;
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335 | }
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336 | #endif /* FEATURE_XARGS_SUPPORT_ZERO_TERM */
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337 |
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338 | #if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
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339 | /*
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340 | * Used if -I<repl> was specified.
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341 | * In this mode, words aren't appended to PROG ARGS.
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342 | * Instead, entire input line is read, then <repl> string
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343 | * in every PROG and ARG is replaced with the line:
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344 | * echo -e "ho ho\nhi" | xargs -I_ cmd __ _
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345 | * results in "cmd 'ho hoho ho' 'ho ho'"; "cmd 'hihi' 'hi'".
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346 | * -n MAX_ARGS seems to be ignored.
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347 | * Tested with GNU findutils 4.5.10.
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348 | */
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349 | //FIXME: n_max_chars is not handled the same way as in GNU findutils.
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350 | //FIXME: quoting is not implemented.
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351 | static char* FAST_FUNC process_stdin_with_replace(int n_max_chars, int n_max_arg UNUSED_PARAM, char *buf)
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352 | {
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353 | int i;
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354 | char *end, *p;
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355 |
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356 | /* Free strings from last invocation, if any */
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357 | for (i = 0; G.args && G.args[i]; i++)
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358 | if (G.args[i] != G.argv[i])
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359 | free(G.args[i]);
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360 |
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361 | end = buf + n_max_chars;
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362 | p = buf;
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363 |
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364 | while (1) {
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365 | int c = getchar();
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366 | if (c == EOF || c == G.eol_ch) {
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367 | if (p == buf)
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368 | goto ret; /* empty line */
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369 | c = '\0';
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370 | }
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371 | *p++ = c;
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372 | if (c == '\0') { /* EOL or EOF detected */
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373 | i = 0;
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374 | while (G.argv[i]) {
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375 | char *arg = G.argv[i];
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376 | int count = count_strstr(arg, G.repl_str);
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377 | if (count != 0)
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378 | arg = xmalloc_substitute_string(arg, count, G.repl_str, buf);
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379 | store_param(arg);
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380 | dbg_msg("args[]:'%s'", arg);
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381 | i++;
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382 | }
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383 | p = buf;
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384 | goto ret;
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385 | }
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386 | if (p == end) {
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387 | goto ret;
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388 | }
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389 | }
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390 | ret:
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391 | *p = '\0';
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392 | /* store_param(NULL) - caller will do it */
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393 | dbg_msg("return:'%s'", buf);
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394 | return buf;
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395 | }
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396 | #endif
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397 |
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398 | #if ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
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399 | /* Prompt the user for a response, and
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400 | * if user responds affirmatively, return true;
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401 | * otherwise, return false. Uses "/dev/tty", not stdin.
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402 | */
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403 | static int xargs_ask_confirmation(void)
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404 | {
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405 | FILE *tty_stream;
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406 | int c, savec;
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407 |
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408 | tty_stream = xfopen_for_read(CURRENT_TTY);
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409 | fputs(" ?...", stderr);
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410 | fflush_all();
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411 | c = savec = getc(tty_stream);
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412 | while (c != EOF && c != '\n')
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413 | c = getc(tty_stream);
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414 | fclose(tty_stream);
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415 | return (savec == 'y' || savec == 'Y');
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416 | }
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417 | #else
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418 | # define xargs_ask_confirmation() 1
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419 | #endif
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420 |
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421 | //usage:#define xargs_trivial_usage
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422 | //usage: "[OPTIONS] [PROG ARGS]"
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423 | //usage:#define xargs_full_usage "\n\n"
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424 | //usage: "Run PROG on every item given by stdin\n"
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425 | //usage: IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(
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426 | //usage: "\n -p Ask user whether to run each command"
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427 | //usage: )
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428 | //usage: "\n -r Don't run command if input is empty"
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429 | //usage: IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(
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430 | //usage: "\n -0 Input is separated by NUL characters"
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431 | //usage: )
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432 | //usage: "\n -t Print the command on stderr before execution"
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433 | //usage: "\n -e[STR] STR stops input processing"
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434 | //usage: "\n -n N Pass no more than N args to PROG"
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435 | //usage: "\n -s N Pass command line of no more than N bytes"
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436 | //usage: IF_FEATURE_XARGS_SUPPORT_REPL_STR(
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437 | //usage: "\n -I STR Replace STR within PROG ARGS with input line"
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438 | //usage: )
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439 | //usage: IF_FEATURE_XARGS_SUPPORT_TERMOPT(
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440 | //usage: "\n -x Exit if size is exceeded"
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441 | //usage: )
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442 | //usage:#define xargs_example_usage
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443 | //usage: "$ ls | xargs gzip\n"
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444 | //usage: "$ find . -name '*.c' -print | xargs rm\n"
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445 |
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446 | /* Correct regardless of combination of CONFIG_xxx */
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447 | enum {
|
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448 | OPTBIT_VERBOSE = 0,
|
---|
449 | OPTBIT_NO_EMPTY,
|
---|
450 | OPTBIT_UPTO_NUMBER,
|
---|
451 | OPTBIT_UPTO_SIZE,
|
---|
452 | OPTBIT_EOF_STRING,
|
---|
453 | OPTBIT_EOF_STRING1,
|
---|
454 | IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
|
---|
455 | IF_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
|
---|
456 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
|
---|
457 | IF_FEATURE_XARGS_SUPPORT_REPL_STR( OPTBIT_REPLSTR ,)
|
---|
458 | IF_FEATURE_XARGS_SUPPORT_REPL_STR( OPTBIT_REPLSTR1 ,)
|
---|
459 |
|
---|
460 | OPT_VERBOSE = 1 << OPTBIT_VERBOSE ,
|
---|
461 | OPT_NO_EMPTY = 1 << OPTBIT_NO_EMPTY ,
|
---|
462 | OPT_UPTO_NUMBER = 1 << OPTBIT_UPTO_NUMBER,
|
---|
463 | OPT_UPTO_SIZE = 1 << OPTBIT_UPTO_SIZE ,
|
---|
464 | OPT_EOF_STRING = 1 << OPTBIT_EOF_STRING , /* GNU: -e[<param>] */
|
---|
465 | OPT_EOF_STRING1 = 1 << OPTBIT_EOF_STRING1, /* SUS: -E<param> */
|
---|
466 | OPT_INTERACTIVE = IF_FEATURE_XARGS_SUPPORT_CONFIRMATION((1 << OPTBIT_INTERACTIVE)) + 0,
|
---|
467 | OPT_TERMINATE = IF_FEATURE_XARGS_SUPPORT_TERMOPT( (1 << OPTBIT_TERMINATE )) + 0,
|
---|
468 | OPT_ZEROTERM = IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1 << OPTBIT_ZEROTERM )) + 0,
|
---|
469 | OPT_REPLSTR = IF_FEATURE_XARGS_SUPPORT_REPL_STR( (1 << OPTBIT_REPLSTR )) + 0,
|
---|
470 | OPT_REPLSTR1 = IF_FEATURE_XARGS_SUPPORT_REPL_STR( (1 << OPTBIT_REPLSTR1 )) + 0,
|
---|
471 | };
|
---|
472 | #define OPTION_STR "+trn:s:e::E:" \
|
---|
473 | IF_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
|
---|
474 | IF_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
|
---|
475 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0") \
|
---|
476 | IF_FEATURE_XARGS_SUPPORT_REPL_STR( "I:i::")
|
---|
477 |
|
---|
478 | int xargs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
479 | int xargs_main(int argc, char **argv)
|
---|
480 | {
|
---|
481 | int i;
|
---|
482 | int child_error = 0;
|
---|
483 | char *max_args;
|
---|
484 | char *max_chars;
|
---|
485 | char *buf;
|
---|
486 | unsigned opt;
|
---|
487 | int n_max_chars;
|
---|
488 | int n_max_arg;
|
---|
489 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM \
|
---|
490 | || ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
|
---|
491 | char* FAST_FUNC (*read_args)(int, int, char*) = process_stdin;
|
---|
492 | #else
|
---|
493 | #define read_args process_stdin
|
---|
494 | #endif
|
---|
495 |
|
---|
496 | INIT_G();
|
---|
497 |
|
---|
498 | #if ENABLE_DESKTOP && ENABLE_LONG_OPTS
|
---|
499 | /* For example, Fedora's build system uses --no-run-if-empty */
|
---|
500 | applet_long_options =
|
---|
501 | "no-run-if-empty\0" No_argument "r"
|
---|
502 | ;
|
---|
503 | #endif
|
---|
504 | opt = getopt32(argv, OPTION_STR,
|
---|
505 | &max_args, &max_chars, &G.eof_str, &G.eof_str
|
---|
506 | IF_FEATURE_XARGS_SUPPORT_REPL_STR(, &G.repl_str, &G.repl_str)
|
---|
507 | );
|
---|
508 |
|
---|
509 | /* -E ""? You may wonder why not just omit -E?
|
---|
510 | * This is used for portability:
|
---|
511 | * old xargs was using "_" as default for -E / -e */
|
---|
512 | if ((opt & OPT_EOF_STRING1) && G.eof_str[0] == '\0')
|
---|
513 | G.eof_str = NULL;
|
---|
514 |
|
---|
515 | if (opt & OPT_ZEROTERM) {
|
---|
516 | IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin;)
|
---|
517 | IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.eol_ch = '\0';)
|
---|
518 | }
|
---|
519 |
|
---|
520 | argv += optind;
|
---|
521 | argc -= optind;
|
---|
522 | if (!argv[0]) {
|
---|
523 | /* default behavior is to echo all the filenames */
|
---|
524 | *--argv = (char*)"echo";
|
---|
525 | argc++;
|
---|
526 | }
|
---|
527 |
|
---|
528 | /*
|
---|
529 | * The Open Group Base Specifications Issue 6:
|
---|
530 | * "The xargs utility shall limit the command line length such that
|
---|
531 | * when the command line is invoked, the combined argument
|
---|
532 | * and environment lists (see the exec family of functions
|
---|
533 | * in the System Interfaces volume of IEEE Std 1003.1-2001)
|
---|
534 | * shall not exceed {ARG_MAX}-2048 bytes".
|
---|
535 | */
|
---|
536 | n_max_chars = bb_arg_max();
|
---|
537 | if (n_max_chars > 32 * 1024)
|
---|
538 | n_max_chars = 32 * 1024;
|
---|
539 | /*
|
---|
540 | * POSIX suggests substracting 2048 bytes from sysconf(_SC_ARG_MAX)
|
---|
541 | * so that the process may safely modify its environment.
|
---|
542 | */
|
---|
543 | n_max_chars -= 2048;
|
---|
544 |
|
---|
545 | if (opt & OPT_UPTO_SIZE) {
|
---|
546 | n_max_chars = xatou_range(max_chars, 1, INT_MAX);
|
---|
547 | }
|
---|
548 | /* Account for prepended fixed arguments */
|
---|
549 | {
|
---|
550 | size_t n_chars = 0;
|
---|
551 | for (i = 0; argv[i]; i++) {
|
---|
552 | n_chars += strlen(argv[i]) + 1;
|
---|
553 | }
|
---|
554 | n_max_chars -= n_chars;
|
---|
555 | }
|
---|
556 | /* Sanity check */
|
---|
557 | if (n_max_chars <= 0) {
|
---|
558 | bb_error_msg_and_die("can't fit single argument within argument list size limit");
|
---|
559 | }
|
---|
560 |
|
---|
561 | buf = xzalloc(n_max_chars + 1);
|
---|
562 |
|
---|
563 | n_max_arg = n_max_chars;
|
---|
564 | if (opt & OPT_UPTO_NUMBER) {
|
---|
565 | n_max_arg = xatou_range(max_args, 1, INT_MAX);
|
---|
566 | /* Not necessary, we use growable args[]: */
|
---|
567 | /* if (n_max_arg > n_max_chars) n_max_arg = n_max_chars */
|
---|
568 | }
|
---|
569 |
|
---|
570 | #if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
|
---|
571 | if (opt & (OPT_REPLSTR | OPT_REPLSTR1)) {
|
---|
572 | /*
|
---|
573 | * -I<str>:
|
---|
574 | * Unmodified args are kept in G.argv[i],
|
---|
575 | * G.args[i] receives malloced G.argv[i] with <str> replaced
|
---|
576 | * with input line. Setting this up:
|
---|
577 | */
|
---|
578 | G.args = NULL;
|
---|
579 | G.argv = argv;
|
---|
580 | argc = 0;
|
---|
581 | read_args = process_stdin_with_replace;
|
---|
582 | /* Make -I imply -r. GNU findutils seems to do the same: */
|
---|
583 | /* (otherwise "echo -n | xargs -I% echo %" would SEGV) */
|
---|
584 | opt |= OPT_NO_EMPTY;
|
---|
585 | } else
|
---|
586 | #endif
|
---|
587 | {
|
---|
588 | /* Allocate pointers for execvp.
|
---|
589 | * We can statically allocate (argc + n_max_arg + 1) elements
|
---|
590 | * and do not bother with resizing args[], but on 64-bit machines
|
---|
591 | * this results in args[] vector which is ~8 times bigger
|
---|
592 | * than n_max_chars! That is, with n_max_chars == 20k,
|
---|
593 | * args[] will take 160k (!), which will most likely be
|
---|
594 | * almost entirely unused.
|
---|
595 | *
|
---|
596 | * See store_param() for matching 256-step growth logic
|
---|
597 | */
|
---|
598 | G.args = xmalloc(sizeof(G.args[0]) * ((argc + 0xff) & ~0xff));
|
---|
599 | /* Store the command to be executed, part 1 */
|
---|
600 | for (i = 0; argv[i]; i++)
|
---|
601 | G.args[i] = argv[i];
|
---|
602 | }
|
---|
603 |
|
---|
604 | while (1) {
|
---|
605 | char *rem;
|
---|
606 |
|
---|
607 | G.idx = argc;
|
---|
608 | rem = read_args(n_max_chars, n_max_arg, buf);
|
---|
609 | store_param(NULL);
|
---|
610 |
|
---|
611 | if (!G.args[argc]) {
|
---|
612 | if (*rem != '\0')
|
---|
613 | bb_error_msg_and_die("argument line too long");
|
---|
614 | if (opt & OPT_NO_EMPTY)
|
---|
615 | break;
|
---|
616 | }
|
---|
617 | opt |= OPT_NO_EMPTY;
|
---|
618 |
|
---|
619 | if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
|
---|
620 | const char *fmt = " %s" + 1;
|
---|
621 | char **args = G.args;
|
---|
622 | for (i = 0; args[i]; i++) {
|
---|
623 | fprintf(stderr, fmt, args[i]);
|
---|
624 | fmt = " %s";
|
---|
625 | }
|
---|
626 | if (!(opt & OPT_INTERACTIVE))
|
---|
627 | bb_putchar_stderr('\n');
|
---|
628 | }
|
---|
629 |
|
---|
630 | if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
|
---|
631 | child_error = xargs_exec();
|
---|
632 | }
|
---|
633 |
|
---|
634 | if (child_error > 0 && child_error != 123) {
|
---|
635 | break;
|
---|
636 | }
|
---|
637 |
|
---|
638 | overlapping_strcpy(buf, rem);
|
---|
639 | } /* while */
|
---|
640 |
|
---|
641 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
642 | free(G.args);
|
---|
643 | free(buf);
|
---|
644 | }
|
---|
645 |
|
---|
646 | return child_error;
|
---|
647 | }
|
---|
648 |
|
---|
649 |
|
---|
650 | #ifdef TEST
|
---|
651 |
|
---|
652 | const char *applet_name = "debug stuff usage";
|
---|
653 |
|
---|
654 | void bb_show_usage(void)
|
---|
655 | {
|
---|
656 | fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
|
---|
657 | applet_name);
|
---|
658 | exit(EXIT_FAILURE);
|
---|
659 | }
|
---|
660 |
|
---|
661 | int main(int argc, char **argv)
|
---|
662 | {
|
---|
663 | return xargs_main(argc, argv);
|
---|
664 | }
|
---|
665 | #endif /* TEST */
|
---|