diff options
Diffstat (limited to 'comhan.c')
| -rw-r--r-- | comhan.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/comhan.c b/comhan.c new file mode 100644 index 0000000..556aab2 --- /dev/null +++ b/comhan.c @@ -0,0 +1,213 @@ +/*
+ * file: comhan.c
+ *
+ * This file is the command handler for the
+ * MPX operating system.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "mpx.h"
+
+#define BUF_SIZE 80 /* Size of the command line buffer. */
+#define VERSION 0
+#define DATE 1
+#define DIRECTORY 2
+#define STOP 3
+#define HELP 4
+#define PROMPT 5
+#define ALIAS 6
+
+
+
+int length; /* Length of the command line. */
+
+char prompt[20] = "mpx>";
+const char version[] = "MPX OS - Version 1.0\n";
+char date[] = "01/09/1991";
+
+char *cmds[] = {"version", "date", "directory","stop",
+ "help", "prompt", "alias", NULL};
+char *aliases[] = {"", "", "", "", "", "", "", NULL};
+
+/*
+ * comhan() This is the command handler for the MPX OS.
+ * It repeatedly prints a prompt, makes a system
+ * request to read from the console, and then
+ * carries out the command.
+ *
+ * Parameters: None.
+ * Return value: None.
+ */
+
+void comhan() {
+ char *args[5];
+ int argc;
+ int cmd_num;
+ char buffer[BUF_SIZE];
+
+ do {
+ printf("%s ",prompt); /* Print a prompt. */
+ length = BUF_SIZE; /* Reset length of buffer. */
+ sys_req(CON,READ,buffer,&length); /* Request CON input */
+
+ argc = set_args(buffer, args);
+
+ switch (cmd_num = get_cmd(args[0])) {
+ case VERSION: cmd_version(); break;
+ case DATE: cmd_date(args); break;
+ case DIRECTORY: cmd_directory(); break;
+ case STOP: cmd_stop(); break;
+ case HELP: cmd_help(args); break;
+ case PROMPT: cmd_prompt(args); break;
+ case ALIAS: cmd_alias(args); break;
+ default:
+ printf("Can't recognize.\n");
+ break;
+ }
+ } while (cmd_num != STOP);
+}
+
+int get_cmd(char cmd[]){
+ /* return the number associated with a command (use STOP, HELP etc) */
+
+ int i =0 ; //loop control
+
+ if (cmd == NULL) {
+ return -1;
+ }
+
+ strlwr(cmd);
+
+ while (cmds[i] != NULL) {
+ if (strcmp(cmds[i], cmd)==0 || strcmp(aliases[i], cmd)==0){
+ return i;
+ }
+ i++;
+ }
+
+ //default - means it wasn't a valid command
+ return -1;
+}
+
+int set_args(char buffer[], char *args[]) {
+ /* use string tok to set the contents of args from buffer
+ and return the number of args (will go into argc) */
+ char separators[4] = " =/"; //Characters that separate tokens
+ int i = 0; //loop control
+
+ args[i] = strtok(buffer, separators); //Get first token
+ while(args[i] != NULL){
+ args[++i] = strtok(NULL, separators); //Get next tokens
+ }
+
+ return i;
+}
+/**
+ * Print the version number.
+ */
+void cmd_version() {
+ printf("%s", version);
+}
+
+/**
+ * Print or change the date
+ */
+void cmd_date(char *args[]){
+
+ int m, d, y;
+
+ if (strcmp("", args[1])==0) {
+ printf("%s \n", date);
+ } else {
+
+ m = atoi(args[1]);
+ d = atoi(args[2]);
+ y = atoi(args[3]);
+
+ if (m > 0 && m < 13 && d > 0 && d < 32) {
+ sprintf(date, "%d/%d/%d", m, d, y);
+ printf("Date set to %s \n", date);
+ } else {
+ printf("Invalid date. \n");
+ }
+ }
+}
+void cmd_directory(){
+ int no_proc = directory(direct, DIR_SIZE);
+ int i;
+
+ if (no_proc == 1) {
+ printf("You have 1 program \n");
+ } else if (no_proc == 0) {
+ printf("You have no programs \n");
+ } else {
+ printf("You have %d programs \n", no_proc);
+ }
+
+ if (no_proc > 0) {
+ printf("Size Name \n");
+ printf("===================================== \n");
+ }
+
+ for (i = 0; i < no_proc; i++) {
+ printf("%8d %s \n", direct[i].dirsiz, direct[i].dirnam);
+ }
+}
+
+/**
+ * Print a goodbye message
+ */
+void cmd_stop(){
+ printf("**COMHAN execution complete **\n");
+}
+
+/**
+ * Print information about the COMHAN commands.
+ * Will print all commands or just information specific to the
+ * argument if given.
+ */
+void cmd_help(char *args[]){
+ char ver[] = "version Display version number\n";
+ char hlp[] = "help Provide information about commands\n";
+ char dir[] = "directory List .mpx files\n";
+ char dat[] = "date [mm/dd/yyyy] Display or set the system date\n";
+ char stp[] = "stop Terminate execution of COMHAN\n";
+ char prmpt[] = "prompt string Change the prompt for commands\n";
+ char als[] = "alias command=string Create an alias for a command\n";
+
+ switch(get_cmd(args[1])){
+ case VERSION: printf(ver); break;
+ case DATE: printf(dat); break;
+ case DIRECTORY: printf(dir); break;
+ case STOP: printf(stp); break;
+ case HELP: printf(hlp); break;
+ case PROMPT: printf(prmpt); break;
+ case ALIAS: printf(als); break;
+ default:
+ printf("**\tCommand Summary\t**\n");
+ printf("Name Use\n");
+ printf("======================================\n");
+ printf(ver);
+ printf(dat);
+ printf(dir);
+ printf(stp);
+ printf(hlp);
+ printf(prmpt);
+ printf(als);
+ }
+}
+
+/**
+ * Change the prompt.
+ */
+void cmd_prompt(char *args[]){
+ strcpy(prompt, args[1]);
+}
+
+void cmd_alias(char *args[]){
+ //get the number of the command to alias
+ int num = get_cmd(args[1]);
+ strcpy(aliases[num], args[2]);
+ num ++;
+}
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