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 | * Options are supported: "-prtx -n max_arg -s max_chars -e[ouf_str]"
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5 | *
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6 | * (C) 2002,2003 by Vladimir Oleynik <dzo@simtreas.ru>
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7 | *
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8 | * Special thanks
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9 | * - Mark Whitley and Glenn McGrath for stimulus to rewrite :)
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10 | * - Mike Rendell <michael@cs.mun.ca>
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11 | * and David MacKenzie <djm@gnu.ai.mit.edu>.
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12 | *
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13 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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14 | *
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15 | * xargs is described in the Single Unix Specification v3 at
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16 | * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html
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17 | *
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18 | */
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19 |
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20 | #include "libbb.h"
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21 |
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22 | /* This is a NOEXEC applet. Be very careful! */
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23 |
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24 |
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25 | /* COMPAT: SYSV version defaults size (and has a max value of) to 470.
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26 | We try to make it as large as possible. */
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27 | #if !defined(ARG_MAX) && defined(_SC_ARG_MAX)
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28 | #define ARG_MAX sysconf (_SC_ARG_MAX)
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29 | #endif
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30 | #ifndef ARG_MAX
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31 | #define ARG_MAX 470
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32 | #endif
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33 |
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34 |
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35 | #ifdef TEST
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36 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
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37 | # define ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION 1
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38 | # endif
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39 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
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40 | # define ENABLE_FEATURE_XARGS_SUPPORT_QUOTES 1
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41 | # endif
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42 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
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43 | # define ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT 1
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44 | # endif
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45 | # ifndef ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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46 | # define ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM 1
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47 | # endif
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48 | #endif
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49 |
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50 | /*
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51 | This function has special algorithm.
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52 | Don't use fork and include to main!
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53 | */
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54 | static int xargs_exec(char **args)
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55 | {
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56 | int status;
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57 |
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58 | status = spawn_and_wait(args);
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59 | if (status < 0) {
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60 | bb_perror_msg("%s", args[0]);
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61 | return errno == ENOENT ? 127 : 126;
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62 | }
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63 | if (status == 255) {
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64 | bb_error_msg("%s: exited with status 255; aborting", args[0]);
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65 | return 124;
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66 | }
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67 | /* Huh? I think we won't see this, ever. We don't wait with WUNTRACED!
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68 | if (WIFSTOPPED(status)) {
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69 | bb_error_msg("%s: stopped by signal %d",
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70 | args[0], WSTOPSIG(status));
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71 | return 125;
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72 | }
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73 | */
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74 | if (status >= 1000) {
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75 | bb_error_msg("%s: terminated by signal %d",
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76 | args[0], status - 1000);
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77 | return 125;
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78 | }
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79 | if (status)
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80 | return 123;
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81 | return 0;
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82 | }
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83 |
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84 |
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85 | typedef struct xlist_t {
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86 | struct xlist_t *link;
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87 | size_t length;
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88 | char xstr[1];
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89 | } xlist_t;
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90 |
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91 | static smallint eof_stdin_detected;
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92 |
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93 | #define ISBLANK(c) ((c) == ' ' || (c) == '\t')
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94 | #define ISSPACE(c) (ISBLANK(c) || (c) == '\n' || (c) == '\r' \
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95 | || (c) == '\f' || (c) == '\v')
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96 |
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97 | #if ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
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98 | static xlist_t *process_stdin(xlist_t *list_arg,
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99 | const char *eof_str, size_t mc, char *buf)
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100 | {
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101 | #define NORM 0
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102 | #define QUOTE 1
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103 | #define BACKSLASH 2
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104 | #define SPACE 4
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105 |
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106 | char *s = NULL; /* start word */
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107 | char *p = NULL; /* pointer to end word */
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108 | char q = '\0'; /* quote char */
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109 | char state = NORM;
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110 | char eof_str_detected = 0;
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111 | size_t line_l = 0; /* size loaded args line */
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112 | int c; /* current char */
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113 | xlist_t *cur;
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114 | xlist_t *prev;
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115 |
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116 | prev = cur = list_arg;
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117 | while (1) {
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118 | if (!cur) break;
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119 | prev = cur;
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120 | line_l += cur->length;
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121 | cur = cur->link;
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122 | }
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123 |
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124 | while (!eof_stdin_detected) {
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125 | c = getchar();
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126 | if (c == EOF) {
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127 | eof_stdin_detected = 1;
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128 | if (s)
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129 | goto unexpected_eof;
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130 | break;
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131 | }
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132 | if (eof_str_detected)
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133 | continue;
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134 | if (state == BACKSLASH) {
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135 | state = NORM;
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136 | goto set;
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137 | } else if (state == QUOTE) {
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138 | if (c != q)
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139 | goto set;
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140 | q = '\0';
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141 | state = NORM;
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142 | } else { /* if (state == NORM) */
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143 | if (ISSPACE(c)) {
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144 | if (s) {
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145 | unexpected_eof:
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146 | state = SPACE;
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147 | c = '\0';
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148 | goto set;
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149 | }
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150 | } else {
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151 | if (s == NULL)
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152 | s = p = buf;
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153 | if (c == '\\') {
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154 | state = BACKSLASH;
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155 | } else if (c == '\'' || c == '"') {
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156 | q = c;
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157 | state = QUOTE;
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158 | } else {
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159 | set:
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160 | if ((size_t)(p - buf) >= mc)
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161 | bb_error_msg_and_die("argument line too long");
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162 | *p++ = c;
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163 | }
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164 | }
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165 | }
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166 | if (state == SPACE) { /* word's delimiter or EOF detected */
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167 | if (q) {
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168 | bb_error_msg_and_die("unmatched %s quote",
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169 | q == '\'' ? "single" : "double");
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170 | }
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171 | /* word loaded */
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172 | if (eof_str) {
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173 | eof_str_detected = (strcmp(s, eof_str) == 0);
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174 | }
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175 | if (!eof_str_detected) {
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176 | size_t length = (p - buf);
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177 | /* Dont xzalloc - it can be quite big */
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178 | cur = xmalloc(offsetof(xlist_t, xstr) + length);
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179 | cur->link = NULL;
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180 | cur->length = length;
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181 | memcpy(cur->xstr, s, length);
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182 | if (prev == NULL) {
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183 | list_arg = cur;
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184 | } else {
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185 | prev->link = cur;
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186 | }
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187 | prev = cur;
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188 | line_l += length;
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189 | if (line_l > mc) {
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190 | /* stop memory usage :-) */
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191 | break;
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192 | }
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193 | }
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194 | s = NULL;
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195 | state = NORM;
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196 | }
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197 | }
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198 | return list_arg;
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199 | }
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200 | #else
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201 | /* The variant does not support single quotes, double quotes or backslash */
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202 | static xlist_t *process_stdin(xlist_t *list_arg,
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203 | const char *eof_str, size_t mc, char *buf)
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204 | {
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205 |
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206 | int c; /* current char */
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207 | char eof_str_detected = 0;
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208 | char *s = NULL; /* start word */
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209 | char *p = NULL; /* pointer to end word */
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210 | size_t line_l = 0; /* size loaded args line */
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211 | xlist_t *cur;
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212 | xlist_t *prev;
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213 |
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214 | prev = cur = list_arg;
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215 | while (1) {
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216 | if (!cur) break;
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217 | prev = cur;
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218 | line_l += cur->length;
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219 | cur = cur->link;
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220 | }
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221 |
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222 | while (!eof_stdin_detected) {
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223 | c = getchar();
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224 | if (c == EOF) {
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225 | eof_stdin_detected = 1;
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226 | }
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227 | if (eof_str_detected)
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228 | continue;
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229 | if (c == EOF || ISSPACE(c)) {
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230 | if (s == NULL)
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231 | continue;
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232 | c = EOF;
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233 | }
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234 | if (s == NULL)
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235 | s = p = buf;
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236 | if ((p - buf) >= mc)
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237 | bb_error_msg_and_die("argument line too long");
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238 | *p++ = (c == EOF ? '\0' : c);
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239 | if (c == EOF) { /* word's delimiter or EOF detected */
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240 | /* word loaded */
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241 | if (eof_str) {
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242 | eof_str_detected = (strcmp(s, eof_str) == 0);
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243 | }
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244 | if (!eof_str_detected) {
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245 | size_t length = (p - buf);
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246 | /* Dont xzalloc - it can be quite big */
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247 | cur = xmalloc(offsetof(xlist_t, xstr) + length);
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248 | cur->link = NULL;
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249 | cur->length = length;
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250 | memcpy(cur->xstr, s, length);
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251 | if (prev == NULL) {
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252 | list_arg = cur;
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253 | } else {
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254 | prev->link = cur;
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255 | }
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256 | prev = cur;
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257 | line_l += length;
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258 | if (line_l > mc) {
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259 | /* stop memory usage :-) */
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260 | break;
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261 | }
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262 | s = NULL;
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263 | }
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264 | }
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265 | }
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266 | return list_arg;
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267 | }
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268 | #endif /* FEATURE_XARGS_SUPPORT_QUOTES */
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269 |
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270 |
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271 | #if ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
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272 | /* Prompt the user for a response, and
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273 | if the user responds affirmatively, return true;
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274 | otherwise, return false. Uses "/dev/tty", not stdin. */
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275 | static int xargs_ask_confirmation(void)
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276 | {
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277 | FILE *tty_stream;
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278 | int c, savec;
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279 |
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280 | tty_stream = xfopen(CURRENT_TTY, "r");
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281 | fputs(" ?...", stderr);
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282 | fflush(stderr);
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283 | c = savec = getc(tty_stream);
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284 | while (c != EOF && c != '\n')
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285 | c = getc(tty_stream);
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286 | fclose(tty_stream);
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287 | return (savec == 'y' || savec == 'Y');
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288 | }
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289 | #else
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290 | # define xargs_ask_confirmation() 1
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291 | #endif /* FEATURE_XARGS_SUPPORT_CONFIRMATION */
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292 |
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293 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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294 | static xlist_t *process0_stdin(xlist_t *list_arg,
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295 | const char *eof_str ATTRIBUTE_UNUSED, size_t mc, char *buf)
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296 | {
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297 | int c; /* current char */
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298 | char *s = NULL; /* start word */
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299 | char *p = NULL; /* pointer to end word */
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300 | size_t line_l = 0; /* size loaded args line */
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301 | xlist_t *cur;
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302 | xlist_t *prev;
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303 |
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304 | prev = cur = list_arg;
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305 | while (1) {
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306 | if (!cur) break;
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307 | prev = cur;
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308 | line_l += cur->length;
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309 | cur = cur->link;
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310 | }
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311 |
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312 | while (!eof_stdin_detected) {
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313 | c = getchar();
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314 | if (c == EOF) {
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315 | eof_stdin_detected = 1;
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316 | if (s == NULL)
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317 | break;
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318 | c = '\0';
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319 | }
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320 | if (s == NULL)
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321 | s = p = buf;
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322 | if ((size_t)(p - buf) >= mc)
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323 | bb_error_msg_and_die("argument line too long");
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324 | *p++ = c;
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325 | if (c == '\0') { /* word's delimiter or EOF detected */
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326 | /* word loaded */
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327 | size_t length = (p - buf);
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328 | /* Dont xzalloc - it can be quite big */
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329 | cur = xmalloc(offsetof(xlist_t, xstr) + length);
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330 | cur->link = NULL;
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331 | cur->length = length;
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332 | memcpy(cur->xstr, s, length);
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333 | if (prev == NULL) {
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334 | list_arg = cur;
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335 | } else {
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336 | prev->link = cur;
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337 | }
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338 | prev = cur;
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339 | line_l += length;
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340 | if (line_l > mc) {
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341 | /* stop memory usage :-) */
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342 | break;
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343 | }
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344 | s = NULL;
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345 | }
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346 | }
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347 | return list_arg;
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348 | }
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349 | #endif /* FEATURE_XARGS_SUPPORT_ZERO_TERM */
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350 |
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351 | /* Correct regardless of combination of CONFIG_xxx */
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352 | enum {
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353 | OPTBIT_VERBOSE = 0,
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354 | OPTBIT_NO_EMPTY,
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355 | OPTBIT_UPTO_NUMBER,
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356 | OPTBIT_UPTO_SIZE,
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357 | OPTBIT_EOF_STRING,
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358 | USE_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
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359 | USE_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
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360 | USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
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361 |
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362 | OPT_VERBOSE = 1<<OPTBIT_VERBOSE ,
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363 | OPT_NO_EMPTY = 1<<OPTBIT_NO_EMPTY ,
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364 | OPT_UPTO_NUMBER = 1<<OPTBIT_UPTO_NUMBER,
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365 | OPT_UPTO_SIZE = 1<<OPTBIT_UPTO_SIZE ,
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366 | OPT_EOF_STRING = 1<<OPTBIT_EOF_STRING ,
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367 | OPT_INTERACTIVE = USE_FEATURE_XARGS_SUPPORT_CONFIRMATION((1<<OPTBIT_INTERACTIVE)) + 0,
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368 | OPT_TERMINATE = USE_FEATURE_XARGS_SUPPORT_TERMOPT( (1<<OPTBIT_TERMINATE )) + 0,
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369 | OPT_ZEROTERM = USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1<<OPTBIT_ZEROTERM )) + 0,
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370 | };
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371 | #define OPTION_STR "+trn:s:e::" \
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372 | USE_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
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373 | USE_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
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374 | USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
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375 |
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376 | int xargs_main(int argc, char **argv);
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377 | int xargs_main(int argc, char **argv)
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378 | {
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379 | char **args;
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380 | int i, n;
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381 | xlist_t *list = NULL;
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382 | xlist_t *cur;
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383 | int child_error = 0;
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384 | char *max_args, *max_chars;
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385 | int n_max_arg;
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386 | size_t n_chars = 0;
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387 | long orig_arg_max;
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388 | const char *eof_str = "_";
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389 | unsigned opt;
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390 | size_t n_max_chars;
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391 | #if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
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392 | xlist_t* (*read_args)(xlist_t*, const char*, size_t, char*) = process_stdin;
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393 | #else
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394 | #define read_args process_stdin
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395 | #endif
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396 |
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397 | opt = getopt32(argv, OPTION_STR, &max_args, &max_chars, &eof_str);
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398 |
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399 | if (opt & OPT_ZEROTERM)
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400 | USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
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401 |
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402 | argv += optind;
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403 | argc -= optind;
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404 | if (!argc) {
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405 | /* default behavior is to echo all the filenames */
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406 | *argv = (char*)"echo";
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407 | argc++;
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408 | }
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409 |
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410 | orig_arg_max = ARG_MAX;
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411 | if (orig_arg_max == -1)
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412 | orig_arg_max = LONG_MAX;
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413 | orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048 */
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414 |
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415 | if (opt & OPT_UPTO_SIZE) {
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416 | n_max_chars = xatoul_range(max_chars, 1, orig_arg_max);
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417 | for (i = 0; i < argc; i++) {
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418 | n_chars += strlen(*argv) + 1;
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419 | }
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420 | if (n_max_chars < n_chars) {
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421 | bb_error_msg_and_die("cannot fit single argument within argument list size limit");
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422 | }
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423 | n_max_chars -= n_chars;
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424 | } else {
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425 | /* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
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426 | have it at 1 meg). Things will work fine with a large ARG_MAX but it
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427 | will probably hurt the system more than it needs to; an array of this
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428 | size is allocated. */
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429 | if (orig_arg_max > 20 * 1024)
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430 | orig_arg_max = 20 * 1024;
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431 | n_max_chars = orig_arg_max;
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432 | }
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433 | max_chars = xmalloc(n_max_chars);
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434 |
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435 | if (opt & OPT_UPTO_NUMBER) {
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436 | n_max_arg = xatoul_range(max_args, 1, INT_MAX);
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437 | } else {
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438 | n_max_arg = n_max_chars;
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439 | }
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440 |
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441 | while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL ||
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442 | !(opt & OPT_NO_EMPTY))
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443 | {
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444 | opt |= OPT_NO_EMPTY;
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445 | n = 0;
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446 | n_chars = 0;
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447 | #if ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
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448 | for (cur = list; cur;) {
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449 | n_chars += cur->length;
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450 | n++;
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451 | cur = cur->link;
|
---|
452 | if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
|
---|
453 | if (opt & OPT_TERMINATE)
|
---|
454 | bb_error_msg_and_die("argument list too long");
|
---|
455 | break;
|
---|
456 | }
|
---|
457 | }
|
---|
458 | #else
|
---|
459 | for (cur = list; cur; cur = cur->link) {
|
---|
460 | n_chars += cur->length;
|
---|
461 | n++;
|
---|
462 | if (n_chars > n_max_chars || n == n_max_arg) {
|
---|
463 | break;
|
---|
464 | }
|
---|
465 | }
|
---|
466 | #endif /* FEATURE_XARGS_SUPPORT_TERMOPT */
|
---|
467 |
|
---|
468 | /* allocate pointers for execvp:
|
---|
469 | argc*arg, n*arg from stdin, NULL */
|
---|
470 | args = xzalloc((n + argc + 1) * sizeof(char *));
|
---|
471 |
|
---|
472 | /* store the command to be executed
|
---|
473 | (taken from the command line) */
|
---|
474 | for (i = 0; i < argc; i++)
|
---|
475 | args[i] = argv[i];
|
---|
476 | /* (taken from stdin) */
|
---|
477 | for (cur = list; n; cur = cur->link) {
|
---|
478 | args[i++] = cur->xstr;
|
---|
479 | n--;
|
---|
480 | }
|
---|
481 |
|
---|
482 | if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
|
---|
483 | for (i = 0; args[i]; i++) {
|
---|
484 | if (i)
|
---|
485 | fputc(' ', stderr);
|
---|
486 | fputs(args[i], stderr);
|
---|
487 | }
|
---|
488 | if (!(opt & OPT_INTERACTIVE))
|
---|
489 | fputc('\n', stderr);
|
---|
490 | }
|
---|
491 | if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
|
---|
492 | child_error = xargs_exec(args);
|
---|
493 | }
|
---|
494 |
|
---|
495 | /* clean up */
|
---|
496 | for (i = argc; args[i]; i++) {
|
---|
497 | cur = list;
|
---|
498 | list = list->link;
|
---|
499 | free(cur);
|
---|
500 | }
|
---|
501 | free(args);
|
---|
502 | if (child_error > 0 && child_error != 123) {
|
---|
503 | break;
|
---|
504 | }
|
---|
505 | }
|
---|
506 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
507 | free(max_chars);
|
---|
508 | return child_error;
|
---|
509 | }
|
---|
510 |
|
---|
511 |
|
---|
512 | #ifdef TEST
|
---|
513 |
|
---|
514 | const char *applet_name = "debug stuff usage";
|
---|
515 |
|
---|
516 | void bb_show_usage(void)
|
---|
517 | {
|
---|
518 | fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
|
---|
519 | applet_name);
|
---|
520 | exit(1);
|
---|
521 | }
|
---|
522 |
|
---|
523 | int main(int argc, char **argv)
|
---|
524 | {
|
---|
525 | return xargs_main(argc, argv);
|
---|
526 | }
|
---|
527 | #endif /* TEST */
|
---|