annotate main.c @ 3:266a462ed18c

Next drop of toysh, plus more infratructure.
author landley@driftwood
date Wed, 18 Oct 2006 18:38:16 -0400
parents 67b517913e56
children fc9c0503d5e2
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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 {"sh", toysh_main, TOYFLAG_BIN},
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21 {"toysh", toysh_main, TOYFLAG_BIN}
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22 };
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23
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24 #define TOY_LIST_LEN (sizeof(toy_list)/sizeof(struct toy_list))
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25
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26 // global context for this applet.
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27
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28 struct toy_context toys;
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29
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30 struct toy_list *toy_find(char *name)
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31 {
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32 int top, bottom, middle;
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33
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34 // If the name starts with "toybox", accept that as a match. Otherwise
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35 // skip the first entry, which is out of order.
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36
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37 if (!strncmp(name,"toybox",6)) return toy_list;
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38 bottom = 1;
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39
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40 // Binary search to find this applet.
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41
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42 top = TOY_LIST_LEN-1;
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43 for (;;) {
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44 int result;
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45
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46 middle = (top+bottom)/2;
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47 if (middle<bottom || middle>top) return NULL;
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48 result = strcmp(name,toy_list[middle].name);
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49 if (!result) return toy_list+middle;
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50 if (result<0) top=--middle;
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51 else bottom = ++middle;
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52 }
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53 }
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54
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55 void toy_init(struct toy_list *which, char *argv[])
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56 {
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57 // Free old toys contents here?
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58
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59 toys.which = which;
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60 toys.argv = argv;
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61 for (toys.argc = 0; argv[toys.argc]; toys.argc++);
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62 toys.exitval = 1;
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63 }
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64
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65 // Run a toy.
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66 void toy_exec(char *argv[])
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67 {
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68 struct toy_list *which;
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69
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70 which = toy_find(argv[0]);
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71 if (!which) return;
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72
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73 toy_init(which, argv);
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74
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75 exit(toys.which->toy_main());
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76 }
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77
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78 int toybox_main(void)
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79 {
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80 static char *toy_paths[]={"usr/","bin/","sbin/",0};
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81 int i, len = 0;
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82
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83 if (toys.argv[1]) {
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84 if (toys.argv[1][0]!='-') {
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85 toy_exec(toys.argv+1);
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86 error_exit("No behavior for %s\n",toys.argv[1]);
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87 }
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88 }
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89
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90 // Output list of applets.
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91 for (i=1; i<TOY_LIST_LEN; i++) {
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92 int fl = toy_list[i].flags;
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93 if (fl & TOYMASK_LOCATION) {
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94 if (toys.argv[1]) {
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95 int j;
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96 for (j=0; toy_paths[j]; j++)
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97 if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
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98 }
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99 len += printf("%s ",toy_list[i].name);
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100 if (len>65) {
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101 putchar('\n');
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102 len=0;
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103 }
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104 }
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105 }
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106 putchar('\n');
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107 return 0;
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108 }
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109
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110 int main(int argc, char *argv[])
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111 {
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112 char *name;
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113
2
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114 // Figure out which applet to call.
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115 name = rindex(argv[0], '/');
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116 if (!name) name=argv[0];
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117 else name++;
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118 argv[0] = name;
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119
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120 toys.argv = argv-1;
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121 return toybox_main();
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122 }