Michael Shimniok / SimpleShell

Simple embedded shell with runtime pluggable commands.

Dependents:   DataBus2018

Implements a simple unix-like shell for embedded systems with a pluggable command architecture.

SimpleShell.cpp@0:49820d5a38c9, 2018-12-01 (annotated)

Committer:
shimniok
Date:
Sat Dec 01 23:18:03 2018 +0000
Revision:
0:49820d5a38c9
Child:
1:998a7ed04f10
Initial functionality working

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shimniok 0:49820d5a38c9 1 #include "SimpleShell.h"
shimniok 0:49820d5a38c9 2
shimniok 0:49820d5a38c9 3 SimpleShell::SimpleShell()
shimniok 0:49820d5a38c9 4 {
shimniok 0:49820d5a38c9 5 }
shimniok 0:49820d5a38c9 6
shimniok 0:49820d5a38c9 7 void SimpleShell::run()
shimniok 0:49820d5a38c9 8 {
shimniok 0:49820d5a38c9 9 bool done=false;
shimniok 0:49820d5a38c9 10 strcpy(_cwd, "/log");
shimniok 0:49820d5a38c9 11
shimniok 0:49820d5a38c9 12 printf("Type help for assistance.\n");
shimniok 0:49820d5a38c9 13 while (!done) {
shimniok 0:49820d5a38c9 14 printPrompt();
shimniok 0:49820d5a38c9 15 readCommand();
shimniok 0:49820d5a38c9 16 //this.doCommand(cmdline);
shimniok 0:49820d5a38c9 17 }
shimniok 0:49820d5a38c9 18 puts("exiting shell\n");
shimniok 0:49820d5a38c9 19
shimniok 0:49820d5a38c9 20 return;
shimniok 0:49820d5a38c9 21 }
shimniok 0:49820d5a38c9 22
shimniok 0:49820d5a38c9 23
shimniok 0:49820d5a38c9 24 void SimpleShell::printPrompt()
shimniok 0:49820d5a38c9 25 {
shimniok 0:49820d5a38c9 26 fputc('(', stdout);
shimniok 0:49820d5a38c9 27 fputs(_cwd, stdout);
shimniok 0:49820d5a38c9 28 fputs(")# ", stdout);
shimniok 0:49820d5a38c9 29 }
shimniok 0:49820d5a38c9 30
shimniok 0:49820d5a38c9 31
shimniok 0:49820d5a38c9 32 void SimpleShell::readCommand()
shimniok 0:49820d5a38c9 33 {
shimniok 0:49820d5a38c9 34 int i=0;
shimniok 0:49820d5a38c9 35 char c;
shimniok 0:49820d5a38c9 36 bool done = false;
shimniok 0:49820d5a38c9 37
shimniok 0:49820d5a38c9 38 memset(cmd, 0, MAXBUF);
shimniok 0:49820d5a38c9 39 do {
shimniok 0:49820d5a38c9 40 cmd[i] = 0;
shimniok 0:49820d5a38c9 41 c = fgetc(stdin);
shimniok 0:49820d5a38c9 42 if (c == '\r') { // if return is hit, we're done, don't add \r to cmd
shimniok 0:49820d5a38c9 43 done = true;
shimniok 0:49820d5a38c9 44 } else if (i < MAXBUF-1) {
shimniok 0:49820d5a38c9 45 if (c == 0x7f || c == '\b') { // backspace or delete
shimniok 0:49820d5a38c9 46 if (i > 0) { // if we're at the beginning, do nothing
shimniok 0:49820d5a38c9 47 i--;
shimniok 0:49820d5a38c9 48 fputs("\b \b", stdout);
shimniok 0:49820d5a38c9 49
shimniok 0:49820d5a38c9 50 }
shimniok 0:49820d5a38c9 51 } else {
shimniok 0:49820d5a38c9 52 fputc(c, stdout);
shimniok 0:49820d5a38c9 53 cmd[i++] = c;
shimniok 0:49820d5a38c9 54 }
shimniok 0:49820d5a38c9 55 }
shimniok 0:49820d5a38c9 56 } while (!done);
shimniok 0:49820d5a38c9 57 fputc('\n', stdout);
shimniok 0:49820d5a38c9 58
shimniok 0:49820d5a38c9 59
shimniok 0:49820d5a38c9 60 }