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#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
//
void hello()
{
// ascci art: http://patorjk.com/software/taag/#p=testall&f=Cards&t=Fool%20OS
puts(
" ______ __ ____ _____ \n"
" / ____/___ ____ / / / __ \\/ ___/ \n"
" / /_ / __ \\/ __ \\/ / / / / /\\__ \\ \n"
" / __/ / /_/ / /_/ / / / /_/ /___/ / \n"
" /_/ \\____/\\____/_/ \\____//____/ \n"
" \n"
"Welcome to FoolShell v0.2 (Compiled on " __DATE__ " at " __TIME__ "\n"
"--------------------------------------------------------------------\n\n"
"type 'help' anytime to show shell built-ins\n"
"or execute user programms that are in the '/bin' directory (e.g. ls)\n"
);
}
void prompt()
{
printf(
"$ "
);
}
int main(int argc, char **argv)
{
bool silent=false;
for(int i=0;i<argc;i++)
{
if(!strcmp(argv[i],"--silent"))silent=true;
}
if(!silent)hello();
char *buf=malloc(256);
while(1)
{
prompt();
fgets(buf,255,stdin);
buf[strlen(buf)-1]=0; // remove \n
process(buf);
}
return 0;
}
char **tokenize(char *buf)
{
char **token;
token=malloc(10*sizeof(char*));
int l=strlen(buf);
int i;
int c=0;
for(i=0;i<l;i++)
{
// init space for next token
token[c]=malloc(256);
//skip all the whitespace
while(buf[i]==' '&&i<l)i++;
if(i==l)break;
//get token
int t=0;
while(buf[i]!=' '&&i<l)
{
token[c][t]=buf[i];
t++;
i++;
}
token[c][t]=0;
// printf("token %i : <%s>\n",c, token[c]);
c++;
token[c]=NULL;
}
return token;
}
int process(char *buf)
{
char **token=tokenize(buf);
char *command=token[0];
// puts(command);
// copied from trottelshell
if(!strcmp(command,"help"))
{
puts("foolshell: supported built-in commands: 'help', 'echo [string]', 'malloc [bytes]', 'free [address]', 'getenv [var]', 'putenv [var] [val]'");
}
else if(!strcmp(command,"echo"))
{
printf("\"%s\"\n",token[1]);
}
else if(!strcmp(command,"malloc"))
{
uint8_t *mall=malloc(atoi(token[1]));
printf("allocated %d bytes at 0x%08X (%i).\n",atoi(token[1]),mall,mall);
}
else if(!strcmp(command,"free"))
{
free(atoi(token[1]));
printf("called free(0x%08X).\n",atoi(token[1]));
}
else if(!strcmp(command,"getenv"))
{
printf("%s = %s \n",token[1],getenv(token[1]));
}
else if(!strcmp(command,"putenv"))
{
char buf[256];
sprintf(buf,"%s=%s",token[1],token[2]);
putenv(buf);
printf("set: %s = %s \n",token[1],getenv(token[1]));
}
else
{
execve(token[0],token,0);
char buf[256];
sprintf(buf,"/bin/%s",token[0]);
execve(buf,token,0);
puts("foolshell: command not found");
}
}
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