/[cvs]/joko/Uni/BSArch/03/win32/min_shell.c
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revision 1.9 by joko, Thu Jun 15 23:16:01 2006 UTC revision 1.15 by joko, Fri Jun 16 19:48:14 2006 UTC
# Line 3  Line 3 
3  #include <stdlib.h>  #include <stdlib.h>
4  #include <stdio.h>  #include <stdio.h>
5  #include <errno.h>  #include <errno.h>
6    #include <string.h>
7    
8  #include "min_shell.h"  #include "min_shell.h"
9    
   
 #define MAX_COMMAND_LENGTH 1024  
   
10  int main(int argc, char * argv[]) {  int main(int argc, char * argv[]) {
11        
12    // interactive mode with prompt    // 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, "> ");
     char filename[255] = "abc\0";  
     BOOL background = 0;  
     os_start_process(filename, background);  
16    }    }
17        
18    // scripting mode    // scripting mode
19    if (argc == 2) {    if (argc == 2) {
20      FILE * script = fopen(argv[1], "r");      FILE * script = fopen(argv[1], "r");
21      run_commands(script);      run_commands(script, "");
22      fclose(script);      fclose(script);
23    }    }
24  }  }
25    
26  void run_commands(FILE * fp) {  void run_commands(FILE * fp, char * prompt) {
27        
28    char command[MAX_COMMAND_LENGTH];    char command[MAX_COMMAND_LENGTH];
29        
30      // echo first prompt
31      fprintf(stdout, "%s", prompt);
32    while (fgets(command, MAX_COMMAND_LENGTH, fp)) {    while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
33      int command_length;      char *command_ptr = command;
34            
35      // strip newlines      // strip newlines
36      chomp(command);      chomp(command_ptr);
37        
38        // trim whitespace
39        trim(&command_ptr);
40            
41      // ... and action      // ... and action
42      execute_command(command);      if (strlen(command_ptr))
43          dispatch_command(command_ptr);
44        
45        // echo prompt after executing shell command
46        fprintf(stdout, "%s", prompt);
47    }    }
48        
49  }  }
50    
51    
52  void execute_command(char * command) {  void dispatch_command(char * command) {
53    
54    BOOL background = FALSE;    BOOL background = FALSE;
55    int command_length;    int command_length;
56      char first_char;
57      char * shell_command;
58    
59    printf("process_command: %s\n", command);    // is it a shell command?
60        first_char = command[0];
61    // background or foreground?    if (strcmp(&first_char, ":") == 0) {
62    command_length = strlen(command);      
63    if (command[command_length-1] == '&') {      // "calculate" shell command ...
64      command[command_length-1] = '\0';      shell_command = command + 1;
65      background = TRUE;      //printf("shell command: %s\n", shell_command);
66        
67        // ... and dispatch it
68        
69        // wait
70        if (strcmp(shell_command, "wait") == 0) {
71          // TODO
72          os_wait_for_processes();
73        
74        // exit
75        } else if (strcmp(shell_command, "exit") == 0) {
76          exit(EXIT_SUCCESS);
77        
78        // unknown command
79        } else {
80          fprintf(stderr, "ERROR: Unknown shell command '%s'\n", shell_command);
81        }
82      
83      // run program: background or foreground?
84      } else {
85        //printf("running: %s\n", command);
86        command_length = strlen(command);
87        if (command[command_length-1] == '&' && command[command_length-2] == ' ') {
88          command[command_length-1] = '\0';
89          command[command_length-2] = '\0';
90          background = TRUE;
91        }
92        
93        os_start_process(command, background);
94    }    }
     
   os_start_process(command, background);  
95  }  }
96    
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