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	joko	1.13	/* $Id: min_shell.c,v 1.12 2006/06/16 00:37:22 joko Exp $ */
2	joko	1.1
3			#include <stdlib.h>
4	joko	1.3	#include <stdio.h>
5	joko	1.1	#include <errno.h>
6	joko	1.10	#include <string.h>
7	joko	1.2
8	joko	1.4	#include "min_shell.h"
9
10	joko	1.1	int main(int argc, char * argv[]) {
11	joko	1.8
12			// interactive mode with prompt
13	joko	1.1	if (argc == 1) {
14	joko	1.13	fprintf(stderr, "Welcome to mini shell. Have fun!\n");
15	joko	1.12	run_commands(stdin, "> ");
16	joko	1.1	}
17	joko	1.4
18	joko	1.8	// scripting mode
19	joko	1.4	if (argc == 2) {
20			FILE * script = fopen(argv[1], "r");
21	joko	1.12	run_commands(script, "");
22	joko	1.4	fclose(script);
23			}
24	joko	1.1	}
25	joko	1.2
26	joko	1.12	void run_commands(FILE * fp, char * prompt) {
27	joko	1.4
28			char command[MAX_COMMAND_LENGTH];
29
30	joko	1.12	// echo first prompt
31			fprintf(stdout, "%s", prompt);
32	joko	1.8	while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
33	joko	1.14	char *command_ptr = command;
34	joko	1.9
35			// strip newlines
36	joko	1.14	chomp(command_ptr);
37
38			// trim whitespace
39			trim(&command_ptr);
40	joko	1.9
41			// ... and action
42	joko	1.15	if (strlen(command_ptr))
43			dispatch_command(command_ptr);
44	joko	1.12
45			// echo prompt after executing shell command
46			fprintf(stdout, "%s", prompt);
47	joko	1.8	}
48	joko	1.4
49	joko	1.6	}
50
51	joko	1.4
52	joko	1.10	void dispatch_command(char * command) {
53	joko	1.9
54			BOOL background = FALSE;
55			int command_length;
56	joko	1.10	char first_char;
57			char * shell_command;
58	joko	1.9
59	joko	1.10	// 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	joko	1.11	//printf("shell command: %s\n", shell_command);
66	joko	1.10
67			// ... and dispatch it
68
69			// wait
70			if (strcmp(shell_command, "wait") == 0) {
71			// TODO
72	joko	1.11	os_wait_for_processes();
73	joko	1.10
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	joko	1.11	//printf("running: %s\n", command);
86	joko	1.10	command_length = strlen(command);
87	joko	1.15	if (command[command_length-1] == '&' && command[command_length-2] == ' ') {
88	joko	1.10	command[command_length-1] = '\0';
89	joko	1.15	command[command_length-2] = '\0';
90	joko	1.10	background = TRUE;
91			}
92
93			os_start_process(command, background);
94	joko	1.9	}
95	joko	1.3	}
96
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