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annotate toys/example/skeleton.c @ 1499:319e79bab052 draft

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Separate more commands so single.sh can build them standalone.
author Rob Landley <rob@landley.net>
date Fri, 26 Sep 2014 18:42:23 -0500
parents dd2fd057111f
children
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dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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1 /* skeleton.c - Example program to act as template for new commands.
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2 *
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3 * Copyright 2014 Rob Landley <rob@landley.net>
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4 *
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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
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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8 // Accept many different kinds of command line argument (see top of lib/args.c)
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9 // Demonstrate two commands in the same file (see www/documentation.html)
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10
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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11 USE_SKELETON(NEWTOY(skeleton, "(walrus)(blubber):;(also):e@d*c#b:a", TOYFLAG_USR|TOYFLAG_BIN))
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12 USE_SKELETON_ALIAS(NEWTOY(skeleton_alias, "b#dq", TOYFLAG_USR|TOYFLAG_BIN))
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13
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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14 config SKELETON
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15 bool "skeleton"
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16 default n
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17 help
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18 usage: skeleton [-a] [-b STRING] [-c NUMBER] [-d LIST] [-e COUNT] [...]
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19
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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20 Template for new commands. You don't need this.
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21
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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22 When creating a new command, copy this file and delete the parts you
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23 don't need. Be sure to replace all instances of "skeleton" (upper and lower
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24 case) with your new command name.
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25
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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26 For simple commands, "hello.c" is probably a better starting point.
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27
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28 config SKELETON_ALIAS
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29 bool "skeleton_alias"
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30 default n
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31 help
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32 usage: skeleton_alias [-dq] [-b NUMBER]
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33
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34 Example of a second command with different arguments in the same source
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35 file as the first. This allows shared infrastructure not added to lib/.
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36 */
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37
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38 #define FOR_skeleton
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39 #include "toys.h"
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40
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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41 // The union lets lib/args.c store arguments for either command.
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42 // It's customary to put a space between argument variables and other globals.
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43 GLOBALS(
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44 union {
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45 struct {
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46 char *b_string;
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47 long c_number;
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48 struct arg_list *d_list;
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49 long e_count;
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50 char *also_string;
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51 char *blubber_string;
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52 } s;
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53 struct {
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54 long b_number;
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55 } a;
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56 };
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57
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58 int more_globals;
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59 )
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60
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61 // Don't blindly build allyesconfig. The maximum _sane_ config is defconfig.
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62 #warning skeleton.c is just an example, not something to deploy.
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63
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64 // Parse many different kinds of command line argument:
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65 void skeleton_main(void)
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66 {
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67 char **optargs;
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68
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69 printf("Ran %s\n", toys.which->name);
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70
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71 // Command line options parsing is done for you by lib/args.c called
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72 // from main.c using the optstring in the NEWTOY macros. Display results.
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73 if (toys.optflags) printf("flags=%x\n", toys.optflags);
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74 if (toys.optflags & FLAG_a) printf("Saw a\n");
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75 if (toys.optflags & FLAG_b) printf("b=%s\n", TT.s.b_string);
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76 if (toys.optflags & FLAG_c) printf("c=%ld\n", TT.s.c_number);
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77 while (TT.s.d_list) {
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78 printf("d=%s\n", TT.s.d_list->arg);
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79 TT.s.d_list = TT.s.d_list->next;
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80 }
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81 if (TT.s.e_count) printf("e was seen %ld times\n", TT.s.e_count);
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82 for (optargs = toys.optargs; *optargs; optargs++)
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83 printf("optarg=%s\n", *optargs);
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84 if (toys.optflags & FLAG_walrus) printf("Saw --walrus\n");
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85 if (TT.s.blubber_string) printf("--blubber=%s\n", TT.s.blubber_string);
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86
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87 printf("Other globals should start zeroed: %d\n", TT.more_globals);
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88 }
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89
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90 // Switch gears from skeleton to skeleton_alias (swap FLAG macros).
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91 #define CLEANUP_skeleton
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92 #define FOR_skeleton_alias
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93 #include "generated/flags.h"
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94
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95 void skeleton_alias_main(void)
dd2fd057111f Add example directory, move hello.c into it, add skeleton.c to demonstrate more complciated stuff (multiple commands per file, etc), and have genconfig.sh sort backwards so posix is first and example last in menuconfig.
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96 {
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97 printf("Ran %s\n", toys.which->name);
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98 printf("flags=%x\n", toys.optflags);
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99
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100 // Note, this FLAG_b is a different bit position than the other FLAG_b,
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101 // and fills out a different variable of a different type.
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102 if (toys.optflags & FLAG_b) printf("b=%ld", TT.a.b_number);
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103 }