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printenv.c - sbase - suckless unix tools |
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git clone git://git.suckless.org/sbase |
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--- |
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printenv.c (546B) |
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1 /* See LICENSE file for copyright and license details. */ |
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2 #include <stdio.h> |
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3 #include <stdlib.h> |
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4 |
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5 #include "util.h" |
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6 |
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7 extern char **environ; |
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8 |
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9 static void |
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10 usage(void) |
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11 { |
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12 eprintf("usage: %s [var ...]\n", argv0); |
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13 } |
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14 |
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15 int |
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16 main(int argc, char *argv[]) |
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17 { |
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18 char *var; |
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19 int ret = 0; |
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20 |
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21 ARGBEGIN { |
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22 default: |
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23 usage(); |
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24 } ARGEND |
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25 |
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26 if (!argc) { |
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27 for (; *environ; environ++) |
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28 puts(*environ); |
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29 } else { |
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30 for (; *argv; argc--, argv++) { |
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31 if ((var = getenv(*argv))) |
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32 puts(var); |
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33 else |
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34 ret = 1; |
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35 } |
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36 } |
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37 |
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38 return fshut(stdout, "<stdout>") ? 2 : ret; |
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39 } |
