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annotate toys/other/hello.c @ 1005:03f72b57a092

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DHCP client and server, from Ashwini Sharma.
author Rob Landley <rob@landley.net>
date Wed, 14 Aug 2013 19:09:33 -0500
parents b4faf2ae39e8
children a25239480e7a
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1 /* hello.c - A hello world program. (Template for new commands.)
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2 *
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3 * Copyright 2012 Rob Landley <rob@landley.net>
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4 *
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aaa638e82e51 The open group changed their website stupidly, so opengroup.org/onlinepubs forwards to a dead server and you have to use pubs.opengroup.org/onlinepubs now. Change the hello template to note the new location. (Waiting to see if they fix it upstream before touching every command in toys/posix.)
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/
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6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cmdbehav.html
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7
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8 // Accept many different kinds of command line argument:
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9
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10 USE_HELLO(NEWTOY(hello, "(walrus)(blubber):e@d*c#b:a", TOYFLAG_USR|TOYFLAG_BIN))
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11
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12 config HELLO
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13 bool "hello"
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14 default n
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15 help
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16 usage: hello [-a] [-b string] [-c number] [-d list] [-e count] [...]
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18 A hello world program. You don't need this.
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20 Mostly used as an example/skeleton file for adding new commands,
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21 occasionally nice to test kernel booting via "init=/bin/hello".
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22 */
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23
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24 #define FOR_hello
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25 #include "toys.h"
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26
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27 // Hello doesn't use these globals, they're here for example/skeleton purposes.
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29 GLOBALS(
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30 char *b_string;
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31 long c_number;
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32 struct arg_list *d_list;
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33 long e_count;
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34 char *blubber_string;
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35
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36 int more_globals;
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37 )
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38
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39 // Parse many different kinds of command line argument:
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40
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41 void hello_main(void)
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42 {
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43 printf("Hello world\n");
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44
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45 if (toys.optflags) printf("flags=%x\n", toys.optflags);
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46 if (toys.optflags & FLAG_a) printf("Saw a\n");
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47 if (toys.optflags & FLAG_b) printf("b=%s\n", TT.b_string);
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48 if (toys.optflags & FLAG_c) printf("c=%ld\n", TT.c_number);
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49 while (TT.d_list) {
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50 printf("d=%s\n", TT.d_list->arg);
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51 TT.d_list = TT.d_list->next;
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52 }
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53 if (TT.e_count) printf("e was seen %ld times\n", TT.e_count);
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54 while (*toys.optargs) printf("optarg=%s\n", *(toys.optargs++));
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55 if (toys.optflags & FLAG_walrus) printf("Saw --walrus\n");
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56 if (TT.blubber_string) printf("--blubber=%s\n", TT.blubber_string);
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57 }