static int
HelpProc(struct cmd_syndesc *as, void *arock)
{
struct cmd_syndesc *ts;
struct cmd_item *ti;
int ambig;
int code = 0;
if (as->parms[0].items == 0) {
printf("%sCommands are:\n", NName(as->a0name, ": "));
for (ts = allSyntax; ts; ts = ts->next) {
if ((ts->flags & CMD_ALIAS) || (ts->flags & CMD_HIDDEN))
continue;
printf("%-15s %s\n", ts->name, (ts->help ? ts->help : ""));
}
} else {
/* print out individual help topics */
for (ti = as->parms[0].items; ti; ti = ti->next) {
code = 0;
ts = FindSyntax(ti->data, &ambig);
if (ts && (ts->flags & CMD_HIDDEN))
ts = 0; /* no hidden commands */
if (ts) {
/* print out command name and help */
printf("%s%s: %s ", NName(as->a0name, " "), ts->name,
(ts->help ? ts->help : ""));
ts->a0name = as->a0name;
PrintAliases(ts);
PrintSyntax(ts);
PrintFlagHelp(ts);
} else {
if (!ambig)
fprintf(stderr, "%sUnknown topic '%s'\n",
NName(as->a0name, ": "), ti->data);
else {
/* ambiguous, list 'em all */
fprintf(stderr,
"%sAmbiguous topic '%s'; use 'apropos' to list\n",
NName(as->a0name, ": "), ti->data);
}
code = CMD_UNKNOWNCMD;
}
}
}
return (code);
}
//Run commands that are built-in shell functions
static void RunBuiltInCmd(commandT* cmd)
{
//Send SIGCONT to a backgrounded job, but do not give it the foreground
if (strncmp(cmd->argv[0], "bg", 2) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//Bring the process with the given jobNumber
continueBgJob(strtol(cmd->argv[1],NULL,10));
//If there is one argument in the command...
else if (cmd->argc == 1)
//Bring the most recent background process to the foreground
continueBgJob(-1);
else
{
fprintf(stderr, "Too many arguments were given with bg.\n");
}
}
//Return a backgrounded job to the foreground
else if (strncmp(cmd->argv[0], "fg", 2) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//Bring the process with the given jobNumber
bringToForeground(strtol(cmd->argv[1],NULL,10));
//If there is one argument in the command...
else if (cmd->argc == 1)
//Bring the most recent background process to the foreground
bringToForeground(-1);
else
{
fprintf(stderr, "Too many arguments were given with fg.\n");
}
}
//makenew alias
else if (strncmp(cmd->argv[0], "alias", 5) == 0)
{
//If there are two arguments in the command...
if (cmd->argc == 2)
//make new binding
AddAlias(cmd);
//show all bindings
else if (cmd->argc == 1)
PrintAliases();
}
else if (strncmp(cmd->argv[0], "unalias", 7) == 0)
{
RemoveAlias(cmd->argv[1]);
}
else if (strncmp(cmd->argv[0], "cd", 2) == 0)
{
int err;
//If a directory is given, go to that directory
if (cmd->argc == 2)
err = chdir(cmd->argv[1]);
//If a directory isn't given, go to the user's home directory
else
err = chdir(getenv("HOME"));
//If there was a problem changing directories, print an error
if (err == -1)
fprintf(stderr, "%s\n", "Invalid directory\n");
}
//Print the list of background jobs (bgJobsHead)
else if (strncmp(cmd->argv[0], "jobs", 4) == 0){
PrintBgJobList();
}
else
{
fprintf(stderr, "%s is an unrecognized internal command\n", cmd->argv[0]);
fflush(stdout);
}
}
