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annotate toys/xargs.c @ 582:b88bc7dcdb48

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Update chgrp so -R works, tweaking DIRTREE_COMEAGAIN design along the way.
author Rob Landley <rob@landley.net>
date Sun, 27 May 2012 00:56:17 -0500
parents f188e572acc7
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
414
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * xargs.c - Run command with arguments taken from stdin.
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4 *
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5 * Copyright 2011 Rob Landley <rob@landley.net>
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6 *
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7 * See http://opengroup.org/onlinepubs/9699919799/utilities/xargs.html
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8
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9 USE_XARGS(NEWTOY(xargs, "^I:E:L#ptxrn#<1s#0", TOYFLAG_USR|TOYFLAG_BIN))
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10
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11 config XARGS
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12 bool "xargs"
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13 default y
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14 help
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15 usage: xargs [-ptxr0] [-s NUM] [-n NUM] [-L NUM] [-E STR] COMMAND...
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16
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17 Run command line one or more times, appending arguments from stdin.
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18
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19 If command exits with 255, don't launch another even if arguments remain.
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20
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21 -s Size in bytes per command line
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22 -n Max number of arguments per command
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23 -0 Each argument is NULL terminated, no whitespace or quote processing
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24 #-p Prompt for y/n from tty before running each command
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25 #-t Trace, print command line to stderr
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26 #-x Exit if can't fit everything in one command
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27 #-r Don't run command with empty input
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28 #-L Max number of lines of input per command
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29 -E stop at line matching string
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30 */
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31
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32 #include "toys.h"
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33
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34 DEFINE_GLOBALS(
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35 long max_bytes;
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36 long max_entries;
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37 long L;
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38 char *eofstr;
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39 char *I;
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40
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41 long entries, bytes;
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42 char delim;
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43 )
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44
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45 #define TT this.xargs
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46
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47 // If out==NULL count TT.bytes and TT.entries, stopping at max.
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48 // Otherwise, fill out out[]
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49
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50 // Returning NULL means need more data.
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51 // Returning char * means hit data limits, start of data left over
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52 // Returning 1 means hit data limits, but consumed all data
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53 // Returning 2 means hit -E eofstr
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54
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55 static char *handle_entries(char *data, char **entry)
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56 {
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57 if (TT.delim) {
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58 char *s = data;
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59
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60 // Chop up whitespace delimited string into args
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61 while (*s) {
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62 char *save;
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63
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64 while (isspace(*s)) {
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65 if (entry) *s = 0;
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66 s++;
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67 }
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68
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69 if (TT.max_entries && TT.entries >= TT.max_entries)
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70 return *s ? s : (char *)1;
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71
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72 if (!*s) break;
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73 save = s;
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74
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75 for (;;) {
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76 if (++TT.bytes >= TT.max_bytes && TT.max_bytes) return save;
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77 if (!*s || isspace(*s)) break;
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78 s++;
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79 }
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80 if (TT.eofstr) {
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81 int len = s-save;
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82 if (len == strlen(TT.eofstr) && !strncmp(save, TT.eofstr, len))
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83 return (char *)2;
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84 }
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85 if (entry) entry[TT.entries] = save;
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86 ++TT.entries;
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87 }
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88
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89 // -0 support
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90 } else {
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91 TT.bytes += strlen(data)+1;
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92 if (TT.max_bytes && TT.bytes >= TT.max_bytes) return data;
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93 if (TT.max_entries && TT.entries >= TT.max_entries)
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94 return (char *)1;
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95 if (entry) entry[TT.entries] = data;
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96 TT.entries++;
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97 }
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98
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99 return NULL;
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100 }
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101
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102 void xargs_main(void)
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103 {
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104 struct double_list *dlist = NULL;
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105 int entries, bytes, done = 0, status;
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106 char *data = NULL;
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107
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108 if (!(toys.optflags&1)) TT.delim = '\n';
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109
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110 // If no optargs, call echo.
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111 if (!toys.optc) {
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112 free(toys.optargs);
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113 *(toys.optargs = xzalloc(2*sizeof(char *)))="echo";
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114 toys.optc = 1;
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115 }
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116
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117 for (entries = 0, bytes = -1; entries < toys.optc; entries++, bytes++)
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118 bytes += strlen(toys.optargs[entries]);
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119
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120 // Loop through exec chunks.
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121 while (data || !done) {
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122 char **out;
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123
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124 TT.entries = 0;
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125 TT.bytes = bytes;
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126
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127 // Loop reading input
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128 for (;;) {
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129
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130 // Read line
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131 if (!data) {
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132 ssize_t l = 0;
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133 l = getdelim(&data, (size_t *)&l, TT.delim, stdin);
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134
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135 if (l<0) {
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136 data = 0;
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137 done++;
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138 break;
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139 }
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140 }
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141 dlist_add(&dlist, data);
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142
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143 // Count data used
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144 data = handle_entries(data, NULL);
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145 if (!data) continue;
423
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146 if (data == (char *)2) done++;
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147 if ((long)data <= 2) data = 0;
414
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148 else data = xstrdup(data);
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149
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150 break;
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151 }
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152
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153 // Accumulate cally thing
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154
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155 if (data && !TT.entries) error_exit("argument too long");
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156 out = xzalloc((entries+TT.entries+1)*sizeof(char *));
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157
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158 if (dlist) {
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159 struct double_list *dtemp;
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160
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161 // Fill out command line to exec
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162 memcpy(out, toys.optargs, entries*sizeof(char *));
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163 TT.entries = 0;
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164 TT.bytes = bytes;
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165 dlist->prev->next = 0;
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166 for (dtemp = dlist; dtemp; dtemp = dtemp->next)
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167 handle_entries(dtemp->data, out+entries);
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168 }
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169 pid_t pid=fork();
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170 if (!pid) {
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171 xclose(0);
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172 open("/dev/null", O_RDONLY);
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173 xexec(out);
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174 }
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175 waitpid(pid, &status, 0);
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176 status = WEXITSTATUS(status);
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177
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178 // Abritrary number of execs, can't just leak memory each time...
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179 while (dlist) {
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180 struct double_list *dtemp = dlist->next;
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181
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182 free(dlist->data);
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183 free(dlist);
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184 dlist = dtemp;
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185 }
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186 free(out);
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187 }
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188 }