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annotate toys/toysh.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
children 266a462ed18c
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67b517913e56 Infrastructure, first drop of toy shell, and a bit of work on df.
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * toysh - toybox shell
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4 *
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5 * Copyright 2006 Rob Landley <rob@landley.net>
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6 *
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7 * The spec for this is at:
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8 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
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9 *
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10 * Although things like the bash man page are good to read too.
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11 */
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12
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13 // Handle embedded NUL bytes in the command line.
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14
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15 #include "toys.h"
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16
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17 static int handle(char *command)
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18 {
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19 int argc = 0, status;
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20 char *argv[10], *start = command;
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21 pid_t pid;
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22 struct toy_list *tl;
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23
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24 // Parse command into argv[]
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25 for (;;) {
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26 char *end;
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27
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28 // Skip leading whitespace and detect EOL.
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29 while(isspace(*start)) start++;
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30 if (!*start || *start=='#') break;
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31
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32 // Grab next word. (Add dequote and envvar logic here)
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33 end = start;
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34 while (*end && !isspace(*end)) end++;
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35 argv[argc++] = xstrndup(start, end-start);
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36 start=end;
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37 }
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38 argv[argc]=0;
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39
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40 if (!argc) return 0;
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41
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42 tl = toy_find(argv[0]);
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43 // This is a bit awkward, next design cycle should clean it up.
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44 // Should vfork(), move to tryspawn()?
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45 pid = 0;
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46 if (tl && (tl->flags & TOYFLAG_NOFORK))
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47 status = tl->toy_main();
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48 else {
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49 pid=fork();
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50 if(!pid) {
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51 toy_exec(argv);
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52 xexec(argv);
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53 } else waitpid(pid, &status, 0);
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54 }
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55 while(argc) free(argv[--argc]);
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56
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57 return 0;
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58 }
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59
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60 int cd_main(void)
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61 {
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62 char *dest = toys.argc>1 ? toys.argv[1] : getenv("HOME");
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63 if (chdir(dest)) error_exit("chdir %s",dest);
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64 return 0;
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65 }
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66
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67 int exit_main(void)
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68 {
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69 exit(toys.argc>1 ? atoi(toys.argv[1]) : 0);
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70 }
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71
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72 int toysh_main(void)
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73 {
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74 char *command=NULL;
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75 FILE *f;
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76
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77 // TODO get_optflags(argv, "c:", &command);
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78
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79 f = toys.argv[1] ? xfopen(toys.argv[1], "r") : NULL;
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80 if (command) handle(command);
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81 else {
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82 unsigned cmdlen=0;
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83 for (;;) {
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84 if (!f) putchar('$');
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85 if (1 > getline(&command, &cmdlen, f ? : stdin)) break;
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86 handle(command);
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87 }
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88 if (CFG_TOYS_FREE) free(command);
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89 }
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90
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91 return 1;
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92 }