03/win32/min_shell.c

/* $Id: min_shell.c,v 1.12 2006/06/16 00:37:22 joko Exp $ */

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#include "min_shell.h"

int main(int argc, char * argv[]) {
  
  // interactive mode with prompt
  if (argc == 1) {
    fprintf(stderr, "Welcome to mini shell. Have fun!\n");
    run_commands(stdin, "> ");
  }
  
  // scripting mode
  if (argc == 2) {
    FILE * script = fopen(argv[1], "r");
    run_commands(script, "");
    fclose(script);
  }
}

void run_commands(FILE * fp, char * prompt) {
  
  char command[MAX_COMMAND_LENGTH];
  
  // echo first prompt
  fprintf(stdout, "%s", prompt);
  while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
    char *command_ptr = command;
    
    // strip newlines
    chomp(command_ptr);
    
    // trim whitespace
    trim(&command_ptr);
    
    // ... and action
    if (strlen(command_ptr))
      dispatch_command(command_ptr);
    
    // echo prompt after executing shell command
    fprintf(stdout, "%s", prompt);
  }
  
}


void dispatch_command(char * command) {

  BOOL background = FALSE;
  int command_length;
  char first_char;
  char * shell_command;

  // is it a shell command?
  first_char = command[0];
  if (strcmp(&first_char, ":") == 0) {
    
    // "calculate" shell command ...
    shell_command = command + 1;
    //printf("shell command: %s\n", shell_command);
    
    // ... and dispatch it
    
    // wait
    if (strcmp(shell_command, "wait") == 0) {
      // TODO
      os_wait_for_processes();
    
    // exit
    } else if (strcmp(shell_command, "exit") == 0) {
      exit(EXIT_SUCCESS);
    
    // unknown command
    } else {
      fprintf(stderr, "ERROR: Unknown shell command '%s'\n", shell_command);
    }
  
  // run program: background or foreground?
  } else {
    //printf("running: %s\n", command);
    command_length = strlen(command);
    if (command[command_length-1] == '&' && command[command_length-2] == ' ') {
      command[command_length-1] = '\0';
      command[command_length-2] = '\0';
      background = TRUE;
    }
    
    os_start_process(command, background);
  }
}

1	/* $Id: min_shell.c,v 1.12 2006/06/16 00:37:22 joko Exp $ */
2
3	#include <stdlib.h>
4	#include <stdio.h>
5	#include <errno.h>
6	#include <string.h>
7
8	#include "min_shell.h"
9
10	int main(int argc, char * argv[]) {
11
12	// interactive mode with prompt
13	if (argc == 1) {
14	fprintf(stderr, "Welcome to mini shell. Have fun!\n");
15	run_commands(stdin, "> ");
16	}
17
18	// scripting mode
19	if (argc == 2) {
20	FILE * script = fopen(argv[1], "r");
21	run_commands(script, "");
22	fclose(script);
23	}
24	}
25
26	void run_commands(FILE * fp, char * prompt) {
27
28	char command[MAX_COMMAND_LENGTH];
29
30	// echo first prompt
31	fprintf(stdout, "%s", prompt);
32	while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
33	char *command_ptr = command;
34
35	// strip newlines
36	chomp(command_ptr);
37
38	// trim whitespace
39	trim(&command_ptr);
40
41	// ... and action
42	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 dispatch_command(char * command) {
53
54	BOOL background = FALSE;
55	int command_length;
56	char first_char;
57	char * shell_command;
58
59	// is it a shell command?
60	first_char = command[0];
61	if (strcmp(&first_char, ":") == 0) {
62
63	// "calculate" shell command ...
64	shell_command = command + 1;
65	//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	}
95	}
96
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