preparing switch to ELF userspace

1 files changed, 147 insertions, 0 deletions

diff --git a/userspace/shell.c b/userspace/shell.c
new file mode 100644
index 0000000..36912c8
--- /dev/null
+++ b/userspace/shell.c
@@ -0,0 +1,147 @@
+#include <stdio.h>
+#include <assert.h>
+#include <string.h>
+#include "syscalls.c"
+#include "../fs/fs.h"
+
+void hello() {
+    puts(
+        "Welcome to FoolShell v0.1"
+    );
+}
+
+void prompt() {
+    printf(
+        "$ "
+    );
+}
+
+int main(int argc, char **argv) 
+{
+    hello();
+
+    FILE *input;
+    input=fopen("input.txt","r");
+    char *buf=malloc(256);
+
+    while(1)
+    {
+	prompt();
+        fgets(buf,255,input);
+	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++;
+
+    }
+
+    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]', 'ls [inode_nr]', exec [inode_nr],'malloc [bytes]', 'free [address]', 'getenv [var]', 'putenv [var] [val]'");
+    }
+    else if(!strcmp(command,"ls"))
+    {
+	fs_dirent *dirs=malloc(sizeof(fs_dirent)*25);
+
+	int  ls=readdir(atoi(token[1]),dirs,25);
+
+	int i;
+	for(i=0;i<ls;i++)
+	{
+	    printf("foolshell: %i %s%c\n",dirs[i].inode, dirs[i].name, ((dirs[i].type==FS_FILE_TYPE_DIR)?'/':' '));
+	}
+
+    }
+    else if(!strcmp(command,"exec"))
+    {
+	execve(atoi(token[1]),0,0);
+
+    }
+    else if(!strcmp(command,"echo"))
+    {
+	printf("foolshell: \"%s\"\n",token[1]);
+
+    }
+    else if(!strcmp(command,"malloc"))
+    {
+	uint8_t *mall=malloc(atoi(token[1]));
+	printf("foolshell: allocated %d bytes at 0x%08X (%i).\n",atoi(token[1]),mall,mall);
+    }
+    else if(!strcmp(command,"free"))
+    {
+	free(atoi(token[1]));
+	printf("foolshell: called free(0x%08X).\n",atoi(token[1]));
+    }
+    else if(!strcmp(command,"getenv"))
+    {
+	printf("foolshell: %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("foolshell: %s = %s \n",token[1],getenv(token[1]));
+    }
+    else
+    {
+	puts("foolshell: command not found");
+    }
+
+
+    //
+}
+
+
+
+
+