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