03/win32/min_shell.c

/* $Id: min_shell.c,v 1.15 2006/06/16 19:48:14 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
  } else if (argc == 2) {
    FILE * script;
    script = fopen(argv[1], "r");
    if (script == NULL) {
      perror(NULL);
      exit(EXIT_FAILURE);
    }
    run_commands(script, "");
    fclose(script);
  
  } else {
    fprintf(stderr, "Sorry, mini shell just accepts one parameter: a path to a script!\n");
  }
}

void run_commands(FILE * fp, char * prompt) {
  
  char command[MAX_COMMAND_LENGTH];
  char *command_ptr;
  
  // echo first prompt
  fprintf(stdout, "%s", prompt);
  while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
    
    int error_number = ferror(fp);
    
    if (error_number) {
      char * message = strerror(error_number);
      fprintf(stderr, "Error while reading from input stream: %s", message);
      clearerr(fp);
      break;
    }
    
    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	1.16	/* $Id: min_shell.c,v 1.15 2006/06/16 19:48:14 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	1.4
17	joko	1.8	// scripting mode
18	joko	1.16	} 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	joko	1.12	run_commands(script, "");
26	joko	1.4	fclose(script);
27	joko	1.16
28			} else {
29			fprintf(stderr, "Sorry, mini shell just accepts one parameter: a path to a script!\n");
30	joko	1.4	}
31	joko	1.1	}
32	joko	1.2
33	joko	1.12	void run_commands(FILE * fp, char * prompt) {
34	joko	1.4
35			char command[MAX_COMMAND_LENGTH];
36	joko	1.16	char *command_ptr;
37	joko	1.4
38	joko	1.12	// echo first prompt
39			fprintf(stdout, "%s", prompt);
40	joko	1.8	while (fgets(command, MAX_COMMAND_LENGTH, fp)) {
41	joko	1.16
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	joko	1.9
53			// strip newlines
54	joko	1.14	chomp(command_ptr);
55
56			// trim whitespace
57			trim(&command_ptr);
58	joko	1.9
59			// ... and action
60	joko	1.15	if (strlen(command_ptr))
61			dispatch_command(command_ptr);
62	joko	1.12
63			// echo prompt after executing shell command
64			fprintf(stdout, "%s", prompt);
65	joko	1.8	}
66	joko	1.4
67	joko	1.6	}
68
69	joko	1.4
70	joko	1.10	void dispatch_command(char * command) {
71	joko	1.9
72			BOOL background = FALSE;
73			int command_length;
74	joko	1.10	char first_char;
75			char * shell_command;
76	joko	1.9
77	joko	1.10	// 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	joko	1.11	//printf("shell command: %s\n", shell_command);
84	joko	1.10
85			// ... and dispatch it
86
87			// wait
88			if (strcmp(shell_command, "wait") == 0) {
89			// TODO
90	joko	1.11	os_wait_for_processes();
91	joko	1.10
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	joko	1.11	//printf("running: %s\n", command);
104	joko	1.10	command_length = strlen(command);
105	joko	1.15	if (command[command_length-1] == '&' && command[command_length-2] == ' ') {
106	joko	1.10	command[command_length-1] = '\0';
107	joko	1.15	command[command_length-2] = '\0';
108	joko	1.10	background = TRUE;
109			}
110
111			os_start_process(command, background);
112	joko	1.9	}
113	joko	1.3	}
114
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