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annotate main.c @ 2:67b517913e56

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Infrastructure, first drop of toy shell, and a bit of work on df.
author landley@driftwood
date Thu, 05 Oct 2006 16:18:03 -0400
parents 59d58fab67c6
children 266a462ed18c
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e651a31d5416 Starting a new project. Just a bit past the "hello world" stage...
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1 /* vi: set ts=4 :*/
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2 /* Toybox infrastructure.
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3 *
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4 * Copyright 2006 Rob Landley <rob@landley.net>
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5 *
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6 * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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7 */
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8
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9 #include "toys.h"
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10
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11 // The monster fun applet list.
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12
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13 struct toy_list toy_list[] = {
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14 // This one is out of order on purpose.
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15 {"toybox", toybox_main, 0},
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16 // The rest of these are alphabetical, for binary search.
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17 {"cd", cd_main, TOYFLAG_NOFORK},
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18 {"df", df_main, TOYFLAG_USR|TOYFLAG_SBIN},
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19 {"exit", exit_main, TOYFLAG_NOFORK},
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20 {"toysh", toysh_main, TOYFLAG_BIN}
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21 };
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22
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23 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
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24
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25 // global context for this applet.
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26
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27 struct toy_context toys;
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28
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29 struct toy_list *toy_find(char *name)
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30 {
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31 int top, bottom, middle;
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32
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33 // If the name starts with "toybox", accept that as a match. Otherwise
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34 // skip the first entry, which is out of order.
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35
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36 if (!strncmp(name,"toybox",6)) return toy_list;
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37 bottom = 1;
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38
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39 // Binary search to find this applet.
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40
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41 top = TOY_LIST_LEN-1;
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42 for (;;) {
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43 int result;
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44
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45 middle = (top+bottom)/2;
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46 if (middle<bottom || middle>top) return NULL;
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47 result = strcmp(name,toy_list[middle].name);
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48 if (!result) return toy_list+middle;
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49 if (result<0) top=--middle;
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50 else bottom = ++middle;
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51 }
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52 }
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53
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54 // Run a toy.
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55 void toy_exec(char *argv[])
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56 {
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57 struct toy_list *which;
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58
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59 which = toy_find(argv[0]);
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60 if (!which) return;
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61
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62 // Free old toys contents here?
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63
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64 toys.which = which;
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65 toys.argv = argv;
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66 for (toys.argc = 0; argv[toys.argc]; toys.argc++);
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67 toys.exitval = 1;
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68
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69 exit(toys.which->toy_main());
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70 }
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71
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72 int toybox_main(void)
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73 {
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74 static char *toy_paths[]={"usr/","bin/","sbin/",0};
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75 int i, len = 0;
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76
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77 if (toys.argv[1]) {
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78 if (toys.argv[1][0]!='-') {
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79 toy_exec(toys.argv+1);
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80 error_exit("No behavior for %s\n",toys.argv[1]);
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81 }
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82 }
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83
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84 // Output list of applets.
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85 for (i=1; i<TOY_LIST_LEN; i++) {
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86 int fl = toy_list[i].flags;
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87 if (fl & TOYMASK_LOCATION) {
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88 if (toys.argv[1]) {
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89 int j;
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90 for (j=0; toy_paths[j]; j++)
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91 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
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92 }
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93 len += printf("%s ",toy_list[i].name);
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94 if (len>65) {
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95 putchar('\n');
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96 len=0;
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97 }
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98 }
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99 }
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100 putchar('\n');
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101 return 0;
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102 }
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103
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104 int main(int argc, char *argv[])
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105 {
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106 char *name;
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107
2
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108 // Figure out which applet to call.
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109 name = rindex(argv[0], '/');
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110 if (!name) name=argv[0];
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111 else name++;
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112 argv[0] = name;
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113
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114 toys.argv = argv-1;
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115 return toybox_main();
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116 }