/[cvs]/joko/Uni/BSArch/03/win32/min_shell.c
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Diff of /joko/Uni/BSArch/03/win32/min_shell.c

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revision 1.1 by joko, Thu Jun 15 12:22:56 2006 UTC revision 1.16 by joko, Fri Jun 16 20:32:37 2006 UTC
# Line 1  Line 1 
1  /* $Id$ */  /* $Id$ */
2    
3  #include <stdlib.h>  #include <stdlib.h>
4    #include <stdio.h>
5  #include <errno.h>  #include <errno.h>
6    #include <string.h>
7    
8    #include "min_shell.h"
9    
10  int main(int argc, char * argv[]) {  int main(int argc, char * argv[]) {
11      
12      // interactive mode with prompt
13    if (argc == 1) {    if (argc == 1) {
14      printf("No arguments given.");      fprintf(stderr, "Welcome to mini shell. Have fun!\n");
15      exit(EXIT_FAILURE);      run_commands(stdin, "> ");
16      
17      // scripting mode
18      } else if (argc == 2) {
19        FILE * script;
20        script = fopen(argv[1], "r");
21        if (script == NULL) {
22          perror(NULL);
23          exit(EXIT_FAILURE);
24        }
25        run_commands(script, "");
26        fclose(script);
27      
28      } else {
29        fprintf(stderr, "Sorry, mini shell just accepts one parameter: a path to a script!\n");
30      }
31    }
32    
33    void run_commands(FILE * fp, char * prompt) {
34      
35      char command[MAX_COMMAND_LENGTH];
36      char *command_ptr;
37      
38      // echo first prompt
39      fprintf(stdout, "%s", prompt);
40      while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
41        
42        int error_number = ferror(fp);
43        
44        if (error_number) {
45          char * message = strerror(error_number);
46          fprintf(stderr, "Error while reading from input stream: %s", message);
47          clearerr(fp);
48          break;
49        }
50        
51        command_ptr = command;
52        
53        // strip newlines
54        chomp(command_ptr);
55        
56        // trim whitespace
57        trim(&command_ptr);
58        
59        // ... and action
60        if (strlen(command_ptr))
61          dispatch_command(command_ptr);
62        
63        // echo prompt after executing shell command
64        fprintf(stdout, "%s", prompt);
65    }    }
66      
67  }  }
68    
69    
70    void dispatch_command(char * command) {
71    
72      BOOL background = FALSE;
73      int command_length;
74      char first_char;
75      char * shell_command;
76    
77      // is it a shell command?
78      first_char = command[0];
79      if (strcmp(&first_char, ":") == 0) {
80        
81        // "calculate" shell command ...
82        shell_command = command + 1;
83        //printf("shell command: %s\n", shell_command);
84        
85        // ... and dispatch it
86        
87        // wait
88        if (strcmp(shell_command, "wait") == 0) {
89          // TODO
90          os_wait_for_processes();
91        
92        // exit
93        } else if (strcmp(shell_command, "exit") == 0) {
94          exit(EXIT_SUCCESS);
95        
96        // unknown command
97        } else {
98          fprintf(stderr, "ERROR: Unknown shell command '%s'\n", shell_command);
99        }
100      
101      // run program: background or foreground?
102      } else {
103        //printf("running: %s\n", command);
104        command_length = strlen(command);
105        if (command[command_length-1] == '&' && command[command_length-2] == ' ') {
106          command[command_length-1] = '\0';
107          command[command_length-2] = '\0';
108          background = TRUE;
109        }
110        
111        os_start_process(command, background);
112      }
113    }
114    
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