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annotate toys/other/printenv.c @ 656:6df4ccc0acbe

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Regularize command headers, update links to standards documents.
author Rob Landley <rob@landley.net>
date Sat, 25 Aug 2012 18:08:51 -0500
parents 2986aa63a021
children 786841fdb1e0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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a191ea9bc5df Implement printenv command.
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * printenv.c - Print environment variables.
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4 *
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5 * Copyright 2012 Georgi Chorbadzhiyski <georgi@unixsol.org>
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6
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7 USE_PRINTENV(NEWTOY(printenv, "0(null)", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config PRINTENV
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10 bool "printenv"
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11 default y
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12 help
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13 usage: printenv [-0] [env_var...]
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14
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15 Print environment variables.
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16
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17 -0 Use \0 as delimiter instead of \n
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18 */
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19
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20 #include "toys.h"
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21
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22 extern char **environ;
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23
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24 void printenv_main(void)
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25 {
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26 char **env, **var = toys.optargs;
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27 char delim = '\n';
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29 if (toys.optflags) delim = 0;
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30
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31 do {
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32 int catch = 0, len = *var ? strlen(*var) : 0;
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33
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34 for (env = environ; *env; env++) {
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35 char *out = *env;
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36 if (*var) {
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37 if (!strncmp(out, *var, len) && out[len] == '=')
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38 out += len +1;
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39 else continue;
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40 }
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41 xprintf("%s%c", out, delim);
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42 catch++;
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43 }
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44 if (*var && !catch) toys.exitval = 1;
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45 } while (*var && *(++var));
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46 }