shell/bbsh.c

   1 /* vi: set ts=4 :
   2  *
   3  * bbsh - busybox shell
   4  *
   5  * Copyright 2006 Rob Landley <rob@landley.net>
   6  *
   7  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   8  */
   9
  10 // Handle embedded NUL bytes in the command line.
  11
  12 #include <busybox.h>
  13
  14 static int handle(char *command)
  15 {
  16         int argc=0;
  17         char *argv[10], *start = command;
  18
  19         // Parse command into argv[]
  20         for (;;) {
  21                 char *end;
  22
  23                 // Skip leading whitespace and detect EOL.
  24                 while(isspace(*start)) start++;
  25                 if(!*start || *start=='#') break;
  26
  27                 // Grab next word.  (Add dequote and envvar logic here)
  28                 end=start;
  29                 while(*end && !isspace(*end)) end++;
  30                 argv[argc++]=xstrndup(start,end-start);
  31                 start=end;
  32         }
  33         argv[argc]=0;
  34
  35         if (!argc) return 0;
  36         if (argc==2 && !strcmp(argv[0],"cd")) chdir(argv[1]);
  37         else if(!strcmp(argv[0],"exit")) exit(argc>1 ? atoi(argv[1]) : 0);
  38         else {
  39                 int status;
  40                 pid_t pid=fork();
  41                 if(!pid) {
  42                         run_applet_by_name(argv[0],argc,argv);
  43                         execvp(argv[0],argv);
  44                         printf("No %s",argv[0]);
  45                         exit(1);
  46                 } else waitpid(pid, &status, 0);
  47         }
  48         while(argc) free(argv[--argc]);
  49
  50         return 0;
  51 }
  52
  53 int bbsh_main(int argc, char *argv[])
  54 {
  55         char *command=NULL;
  56         FILE *f;
  57
  58         bb_getopt_ulflags(argc, argv, "c:", &command);
  59
  60         f = argv[optind] ? xfopen(argv[optind],"r") : NULL;
  61         if (command) handle(command);
  62         else {
  63                 unsigned cmdlen=0;
  64                 for (;;) {
  65                         if(!f) putchar('$');
  66                         if(1 > getline(&command,&cmdlen,f ? : stdin)) break;
  67                         handle(command);
  68                 }
  69                 if (ENABLE_FEATURE_CLEAN_UP) free(command);
  70         }
  71
  72         return 1;
  73 }