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)) {
    int command_length;
    
    // strip newlines
    chomp(command);
    
    // ... and action
    dispatch_command(command);
    
    // 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-1] = '\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	1.9	int command_length;
34
35			// strip newlines
36	joko	1.8	chomp(command);
37	joko	1.9
38			// ... and action
39	joko	1.10	dispatch_command(command);
40	joko	1.12
41			// echo prompt after executing shell command
42			fprintf(stdout, "%s", prompt);
43	joko	1.8	}
44	joko	1.4
45	joko	1.6	}
46
47	joko	1.4
48	joko	1.10	void dispatch_command(char * command) {
49	joko	1.9
50			BOOL background = FALSE;
51			int command_length;
52	joko	1.10	char first_char;
53			char * shell_command;
54	joko	1.9
55	joko	1.10	// is it a shell command?
56			first_char = command[0];
57			if (strcmp(&first_char, ":") == 0) {
58
59			// "calculate" shell command ...
60			shell_command = command + 1;
61	joko	1.11	//printf("shell command: %s\n", shell_command);
62	joko	1.10
63			// ... and dispatch it
64
65			// wait
66			if (strcmp(shell_command, "wait") == 0) {
67			// TODO
68	joko	1.11	os_wait_for_processes();
69	joko	1.10
70			// exit
71			} else if (strcmp(shell_command, "exit") == 0) {
72			exit(EXIT_SUCCESS);
73
74			// unknown command
75			} else {
76			fprintf(stderr, "ERROR: Unknown shell command '%s'\n", shell_command);
77			}
78
79			// run program: background or foreground?
80			} else {
81	joko	1.11	//printf("running: %s\n", command);
82	joko	1.10	command_length = strlen(command);
83			if (command[command_length-1] == '&') {
84			command[command_length-1] = '\0';
85			background = TRUE;
86			}
87
88			os_start_process(command, background);
89	joko	1.9	}
90	joko	1.3	}
91
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