From c298ca7e6beaad0bcc32af6d4cf50d41b79f13b7 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Fri, 21 Sep 2018 12:56:51 +0200
Subject: fix framebufffer/ textmode and clean userspace a little bit more

---
 userspace/date.c        |  19 +++
 userspace/fd.c          |   8 --
 userspace/foolshell.c   | 297 --------------------------------------------
 userspace/fsh.c         | 320 ++++++++++++++++++++++++++++++++++++++++++++++++
 userspace/init.c        |  16 ++-
 userspace/newcalls.h    |   2 +-
 userspace/nonl.c        |  15 ---
 userspace/piper.c       |  27 ----
 userspace/simple.c      |  31 -----
 userspace/sysfs_write.c |   9 --
 userspace/task1.c       |   1 -
 userspace/test-math.c   |  33 -----
 userspace/test_env.c    |  31 +++++
 userspace/test_math.c   |  33 +++++
 userspace/test_sysfs.c  |   9 ++
 15 files changed, 420 insertions(+), 431 deletions(-)
 create mode 100644 userspace/date.c
 delete mode 100644 userspace/fd.c
 delete mode 100644 userspace/foolshell.c
 create mode 100644 userspace/fsh.c
 delete mode 100644 userspace/nonl.c
 delete mode 100644 userspace/piper.c
 delete mode 100644 userspace/simple.c
 delete mode 100644 userspace/sysfs_write.c
 delete mode 100644 userspace/test-math.c
 create mode 100644 userspace/test_env.c
 create mode 100644 userspace/test_math.c
 create mode 100644 userspace/test_sysfs.c

(limited to 'userspace')

diff --git a/userspace/date.c b/userspace/date.c
new file mode 100644
index 0000000..64b8dfc
--- /dev/null
+++ b/userspace/date.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <math.h>
+#include <time.h>
+
+int main(int argc, char **argv) 
+{
+     time_t ltime;
+     time(&ltime); 
+     printf("%s", ctime(&ltime));
+     return 0;
+}
+
+
+
+
+
diff --git a/userspace/fd.c b/userspace/fd.c
deleted file mode 100644
index 80ffd20..0000000
--- a/userspace/fd.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <stdio.h>
-#include <unistd.h>
-
-int main()
-{
-//    dup(stdout);
-    printf("dup\n");
-}
diff --git a/userspace/foolshell.c b/userspace/foolshell.c
deleted file mode 100644
index 4d011da..0000000
--- a/userspace/foolshell.c
+++ /dev/null
@@ -1,297 +0,0 @@
-/**
- * @file
- *
- * Fool's Shell
- * =========
- *
- * A minimalsitic and naive shell developed along the Fool OS kernel.
- * TODO: Free tokenizer / dynamic size!
- */
-
-#include <stdio.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <string.h>
-#include <errno.h>
-#include <string.h>
-
-
-#include "newcalls.h"
-
-extern char **environ;
-
-bool process(char *buf);
-bool metaprocess(char *buf);
-bool cd(char *path);
-
-void version()
-{
-    puts("Fool's Shell version git-commit:" GIT_REVISION "\ncompiled on " __DATE__ " at " __TIME__);
-}
-void help()
-{
-    puts(   "\nfoolshell: supported built-in commands/functions:\n\n" 
-
-	    "'env'                       - show all environment variables\n"
-	    "'getenv [var]'              - show environment variable\n"
-	    "'setenv [var] [val]'        - set environemnet variable\n"
-
-	    "'cd [dir]'                  - change directory (set $PWD)\n"
-	    "'[binary] [params...]'      - run a binary\n"
-	    "'[binary] [params...] &'    - run a binary in background\n"
-	    " TODO                       - pipes\n"
-
-	    "'help'                      - show this message\n"
-	    "'exit'                      - exit running foolshell\n\n");
-
-}
-
-void prompt() 
-{
-    printf("\033[36mfool\033[37m@\033[32mhill\033[33m:%s%s\033[37m",getenv("PWD"),getenv("PS1"));
-}
-
-int main(int argc, char **argv) 
-{
-    for(int i=0;i<argc;i++)
-    {
-	if(!strcmp(argv[i],"--version"))
-	{
-	    version();
-	    return 0;
-	}
-
-	if(!strcmp(argv[i],"--help"))
-	{
-	    help();
-	    return 0;
-	}
-    }
-
-    char *buf=calloc(sizeof(char),256);
-
-    // input and output without buffering
-    setvbuf(stdin,NULL,_IONBF,0);
-    setvbuf(stdout,NULL,_IONBF,0);
-
-    printf("\033c"); // clear screen
-
-    while(1) // process commands until exit
-    {
-	prompt();
-	int bl=0;
-
-	while(1)
-	{
-	    char c=fgetc(stdin);
-
-	    if(c=='\b')
-	    {
-		if(bl==0)continue;
-		buf[--bl]='\0';
-		putc(c,stdout);
-	    }
-	    else
-	    {
-		putc(c,stdout);
-		if(c=='\n')break;
-		buf[bl]=c;
-		buf[++bl]='\0';
-	    }
-	}
-
-	if(!metaprocess(buf))break; // process input and return if exit
-    }
-
-    return 0;
-}
-
-// break the input in tokens on spaces
-char **tokenize(char *buf,char chr)
-{
-    char **token;
-    token=malloc(10*sizeof(char*));
-    token=realloc(token,20*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]==chr&&i<l)i++;
-	if(i==l)break;
-
-	//get token
-	int t=0;
-
-	while(buf[i]!=chr&&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;
-}
-
-bool metaprocess2(char *buf);
-bool metaprocess(char *buf)
-{
-    char **token=tokenize(buf,'|');
-    if(token[0]==0 || token[1]==0)return process(buf); // no pipes
-
-    int pid=_fork();
-
-    if(pid==0)
-    {
-	metaprocess2(buf);
-	exit(1);
-    }
-
-    _wait(pid);
-    return true;
-}
-
-bool metaprocess2(char *buf)
-{
-    char **token=tokenize(buf,'|');
-    if(token[0]==0 || token[1]==0)return process(buf); // no pipes
-
-    int fds[2];
-    _pipe(fds);
-
-    int pid=_fork();
-
-    if(pid==0)
-    {
-	// first child shall write to the pipe
-	_close(fds[0]);
-	_dup2(fds[1],1); // replace stdout with the write-end of our pipe
-	process(token[0]);
-	exit(1);
-    }
-
-    _close(fds[1]); // and we read from it
-    _dup2(fds[0],0); 
-    metaprocess2(strchr(buf,'|')+1);
-
-    _wait(pid);
-
-    return true;
-}
-
-bool process(char *buf)
-{
-    char **token=tokenize(buf,' ');
-    char *command=token[0];
-
-    if(!strcmp(command,"help"))help();
-    else if(!strcmp(command,"cd"))cd(token[1]);
-    else if(!strcmp(command,"exit")) return false;
-    //else if(!strcmp(command,"getenv"))printf("(0x%08X) get: '%s' = '%s'(0x%08X) \n",environ,token[1],getenv(token[1]),getenv(token[1]));
-    else if(!strcmp(command,"getenv"))printf("%s\n",getenv(token[1]));
-    else if(!strcmp(command,"setenv"))
-    {
-	sprintf(buf,"%s=%s",token[1],token[2]);
-	putenv(buf);
-	//printf("(0x%08X) set: '%s' = '%s' \n",environ,token[1],getenv(token[1]));
-    }
-    else if(!strcmp(command,"env"))
-    {
-	int i=0;
-//	printf("env: 0x%08X\n",environ);
-	while(environ[i]!=NULL)
-	{
-//	    printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
-	    printf("%s\n" ,environ[i]);
-	    i++;
-	}
-    }
-    else // otherwise treat command as exectutable and send to execve
-    {
-	int pid=_fork();
-
-	if(pid==0)
-	{
-	    if(token[0][0]=='/')sprintf(buf,"%s",token[0]);
-	    else sprintf(buf,"%s/%s",getenv("PATH"),token[0]);
-	    _execve(buf,token,environ);
-	    printf("foolshell: %s (errno: %d)\n",strerror(errno),errno);
-	    exit(1);
-	}
-	
-	if(token[1]==NULL||strcmp(token[1],"&"))_wait(pid);
-
-    }
-    return true;
-}
-
-bool setpwd(char *path)
-{
-    if(!strcmp(path,"/"))
-    {
-	putenv("PWD=/");
-	return true;
-    }
-    char buf[255];
-    buf[0]=0;
-    strcat(buf,"PWD="); 
-
-    char **t=tokenize(path,'/');
-
-    char *p[100];
-    int pp=0;
-
-    while(*t!=NULL)
-    {
-	if(!strcmp(*t,"..")){
-	    pp--;
-	    t++;
-	    if(pp<0)pp=0;
-	    continue;
-	}
-	if(!strcmp(*t,".")){t++; continue;}
-	if(**t!=0)
-	{
-	    p[pp]=*t;
-	    //printf("> %s\n",p[pp]);
-	    pp++;
-	}
-	t++;
-    }
-
-    if(pp==0)
-    {
-        strcat(buf,"/"); 
-    }
-
-    for(int i=0;i<pp;i++)
-    {
-        strcat(buf,"/"); 
-	strcat(buf,p[i]);
-    }
-
-    putenv(buf);
-    return true; // TODO check if dir exists at all.
-}
-
-bool cd(char *path)
-{
-    char buf[256];
-    if(path==NULL)return setpwd(getenv("HOME"));
-    if(path[0]=='/')return setpwd(path);
-    sprintf(buf,"%s/%s",getenv("PWD"),path);
-    return setpwd(buf);
-}
diff --git a/userspace/fsh.c b/userspace/fsh.c
new file mode 100644
index 0000000..4df4e4e
--- /dev/null
+++ b/userspace/fsh.c
@@ -0,0 +1,320 @@
+/**
+ * @file
+ *
+ * Fool's Shell
+ * =========
+ *
+ * A minimalsitic and naive shell developed along the Fool OS kernel.
+ * TODO: Free tokenizer / dynamic size!
+ * TODO: & with pipes
+ * TODO: > <
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <errno.h>
+#include <string.h>
+#include "interface/fs.h"
+
+#include "newcalls.h"
+
+extern char **environ;
+
+bool process(char *buf);
+bool metaprocess(char *buf);
+bool cd(char *path);
+
+void version()
+{
+    puts("Fool's Shell version git-commit:" GIT_REVISION "\ncompiled on " __DATE__ " at " __TIME__);
+}
+void help()
+{
+    puts(   "\nfoolshell: supported built-in commands/functions:\n\n" 
+
+	    "'env'                       - show all environment variables\n"
+	    "'getenv [var]'              - show environment variable\n"
+	    "'setenv [var] [val]'        - set environemnet variable\n"
+
+	    "'cd [dir]'                  - change directory (set $PWD)\n"
+	    "'[binary] [params...]'      - run a binary\n"
+	    "'[binary] [params...] &'    - run a binary in background\n"
+	    " |                          - pipes\n"
+
+	    "'help'                      - show this message\n"
+	    "'exit'                      - exit running foolshell\n\n");
+
+}
+
+void prompt() 
+{
+    printf("\033[36mfool\033[37m@\033[32mhill\033[33m:%s%s\033[37m",getenv("PWD"),getenv("PS1"));
+}
+
+int main(int argc, char **argv) 
+{
+    for(int i=0;i<argc;i++)
+    {
+	if(!strcmp(argv[i],"--version"))
+	{
+	    version();
+	    return 0;
+	}
+
+	if(!strcmp(argv[i],"--help"))
+	{
+	    help();
+	    return 0;
+	}
+    }
+
+    char *buf=calloc(sizeof(char),256);
+
+    // input and output without buffering
+    setvbuf(stdin,NULL,_IONBF,0);
+    setvbuf(stdout,NULL,_IONBF,0);
+
+    printf("\033c"); // clear screen
+
+    while(1) // process commands until exit
+    {
+	prompt();
+	int bl=0;
+
+	while(1)
+	{
+	    char c=fgetc(stdin);
+
+	    if(c=='\b')
+	    {
+		if(bl==0)continue;
+		buf[--bl]='\0';
+		putc(c,stdout);
+	    }
+	    else
+	    {
+		putc(c,stdout);
+		if(c=='\n')break;
+		buf[bl]=c;
+		buf[++bl]='\0';
+	    }
+	}
+
+	if(!metaprocess(buf))break; // process input and return if exit
+    }
+
+    return 0;
+}
+
+// break the input in tokens on spaces
+char **tokenize(char *buf,char chr)
+{
+    char **token;
+    token=malloc(10*sizeof(char*));
+    token=realloc(token,20*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]==chr&&i<l)i++;
+	if(i==l)break;
+
+	//get token
+	int t=0;
+
+	while(buf[i]!=chr&&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;
+}
+
+bool metaprocess2(char *buf);
+bool metaprocess(char *buf)
+{
+    char **token=tokenize(buf,'|');
+    if(token[0]==0 || token[1]==0)return process(buf); // no pipes
+
+    int pid=_fork();
+
+    if(pid==0)
+    {
+	metaprocess2(buf);
+	exit(1);
+    }
+
+    _wait(pid);
+    return true;
+}
+
+bool metaprocess2(char *buf)
+{
+    char **token=tokenize(buf,'|');
+    if(token[0]==0 || token[1]==0)return process(buf); // no pipes
+
+    int fds[2];
+    _pipe(fds);
+
+    int pid=_fork();
+
+    if(pid==0)
+    {
+	// first child shall write to the pipe
+	_close(fds[0]);
+	_dup2(fds[1],1); // replace stdout with the write-end of our pipe
+	process(token[0]);
+	exit(1);
+    }
+
+    _close(fds[1]); // and we read from it
+    _dup2(fds[0],0); 
+    metaprocess2(strchr(buf,'|')+1);
+
+    _wait(pid);
+
+    return true;
+}
+
+bool process(char *buf)
+{
+    char **token=tokenize(buf,' ');
+    char *command=token[0];
+
+    if(!strcmp(command,"help"))help();
+    else if(!strcmp(command,"cd"))cd(token[1]);
+    else if(!strcmp(command,"exit")) return false;
+    //else if(!strcmp(command,"getenv"))printf("(0x%08X) get: '%s' = '%s'(0x%08X) \n",environ,token[1],getenv(token[1]),getenv(token[1]));
+    else if(!strcmp(command,"getenv"))printf("%s\n",getenv(token[1]));
+    else if(!strcmp(command,"setenv"))
+    {
+	sprintf(buf,"%s=%s",token[1],token[2]);
+	putenv(buf);
+	//printf("(0x%08X) set: '%s' = '%s' \n",environ,token[1],getenv(token[1]));
+    }
+    else if(!strcmp(command,"env"))
+    {
+	int i=0;
+//	printf("env: 0x%08X\n",environ);
+	while(environ[i]!=NULL)
+	{
+//	    printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
+	    printf("%s\n" ,environ[i]);
+	    i++;
+	}
+    }
+    else // otherwise treat command as exectutable and send to execve
+    {
+	int pid=_fork();
+
+	if(pid==0)
+	{
+	    if(token[0][0]=='/')sprintf(buf,"%s",token[0]);
+	    else sprintf(buf,"%s/%s",getenv("PATH"),token[0]);
+	    _execve(buf,token,environ);
+	    printf("foolshell: %s (errno: %d)\n",strerror(errno),errno);
+	    exit(1);
+	}
+	
+	if(token[1]==NULL||strcmp(token[1],"&"))_wait(pid);
+
+    }
+    return true;
+}
+
+bool setpwd(char *path)
+{
+    if(!strcmp(path,"/"))
+    {
+	putenv("PWD=/");
+	return true;
+    }
+    char buf[255];
+    buf[0]=0;
+    strcat(buf,"PWD="); 
+
+    char **t=tokenize(path,'/');
+
+    char *p[100];
+    int pp=0;
+
+    while(*t!=NULL)
+    {
+	if(!strcmp(*t,"..")){
+	    pp--;
+	    t++;
+	    if(pp<0)pp=0;
+	    continue;
+	}
+	if(!strcmp(*t,".")){t++; continue;}
+	if(**t!=0)
+	{
+	    p[pp]=*t;
+	    //printf("> %s\n",p[pp]);
+	    pp++;
+	}
+	t++;
+    }
+
+    if(pp==0)
+    {
+        strcat(buf,"/"); 
+    }
+
+    for(int i=0;i<pp;i++)
+    {
+        strcat(buf,"/"); 
+	strcat(buf,p[i]);
+    }
+
+    putenv(buf);
+    return true; // TODO check if dir exists at all.
+}
+
+bool cd(char *path)
+{
+    char buf[256];
+    // home
+    if(path==NULL)
+    {
+	sprintf(buf,"%s",getenv("HOME"));
+    }
+    // absolute
+    else if(path[0]=='/')
+    {
+	sprintf(buf,"%s",path);
+    }
+    // relative
+    else
+    {
+	sprintf(buf,"%s/%s",getenv("PWD"),path);
+    }
+
+    // check if exists
+    fs_dirent dirs;
+    if(-1==_readdir(buf,&dirs,0))
+    {
+	    printf("directory not found!\n");
+	    return false;
+    }
+
+    return setpwd(buf);
+}
diff --git a/userspace/init.c b/userspace/init.c
index 8530368..0a3b870 100644
--- a/userspace/init.c
+++ b/userspace/init.c
@@ -3,21 +3,19 @@
 
 int main(int argc, char **argv)
 {
-    char *argv1[]={"/bin/foolshell",0};
+    char *argv1[]={"/bin/fsh",0};
     char *env1[]={"HOME=/home/miguel","PS1=\033[34m$\033[37m","PWD=/home/miguel","PATH=/bin","TERM=fool-term",0};
 
-    time_t ltime;
-    time(&ltime); 
-    printf("fool-init: current time: %s\n", ctime(&ltime));
-
     // loop forever and spawn shells if the top-shell exits
     while(1)
     {
 
 	int pid=_fork();
+
 	if(pid==0)
 	{
-	    _execve("/bin/foolshell",argv1,env1); // replace process with our foolshell :)
+	    printf("fool-init: spawning fool-shell\n");
+	    _execve("/bin/fsh",argv1,env1); // replace process with our foolshell :)
 	    while(1) puts("FATAL ERROR: Something terrible happened. Unable to Execute SHELL!\n");
 	}
 
@@ -25,9 +23,9 @@ int main(int argc, char **argv)
 	// and respawn SHELL 
 	_wait(pid);
 	
-	printf("fool-init: catched exit of process %d.\n",pid);
-	printf("fool-init: respawning a new fool-shell\n");
-    }
+	printf("fool-init: respawning new fool-shell\n");
+
+    } 
 
     return 0;
 }
diff --git a/userspace/newcalls.h b/userspace/newcalls.h
index 4568711..20d8ffd 100644
--- a/userspace/newcalls.h
+++ b/userspace/newcalls.h
@@ -1,6 +1,6 @@
 //////////////////////////////////////////////////
 
-// this syscall will be moved to newlib later!
+// this syscall will be moved to newlib later! TODO!
 #define SYSCALL_CLONE 83
 #define SYSCALL_PIPE 84
 #define SYSCALL_DUP2 86
diff --git a/userspace/nonl.c b/userspace/nonl.c
deleted file mode 100644
index 3940453..0000000
--- a/userspace/nonl.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-void atex()
-{
-    printf("atex\n");
-}
-int main()
-{
-    printf("nonextline");
-//   fflush(stdout);
-    
-//    atexit(&atex);
-    return EXIT_SUCCESS;
-}
diff --git a/userspace/piper.c b/userspace/piper.c
deleted file mode 100644
index 80cbd27..0000000
--- a/userspace/piper.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include <stdio.h>
-#include "newcalls.h"
-
-extern **environ;
-
-int main()
-{
-    int fds[2];
-    _pipe(fds);
-
-    int pid=_fork();
-
-    if(pid)
-    {
-	_close(fds[1]);
-	_dup2(fds[0],0); // replace stdin with the read-end of pipe
-	char *args[]={"grep",NULL};
-	_execve("/bin/grep",args,environ);
-    }
-    else
-    {
-	_close(fds[0]);
-	_dup2(fds[1],1); // replace stdout with the write-end of our pipe
-	char *args[]={"cat","hello.txt",0};
-	_execve("/bin/cat",args,environ);
-    }
-}
diff --git a/userspace/simple.c b/userspace/simple.c
deleted file mode 100644
index 0a04791..0000000
--- a/userspace/simple.c
+++ /dev/null
@@ -1,31 +0,0 @@
-#include <stdlib.h>
-
-extern char **environ;
-
-int main(int argc, char **argv) 
-{
-
-    printf("argv: 0x%08X\n",argv);
-    printf("env: 0x%08X\n",environ);
-    
-    int i=0;
-    while(environ[i]!=NULL)
-    {
-	printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
-	i++;
-    }
-
-    putenv("supa=dupa");
-    printf("env: 0x%08X\n",environ);
-    
-    i=0;
-    while(environ[i]!=NULL)
-    {
-	printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
-	i++;
-    }
-    
-    return 0;
-}
-
-
diff --git a/userspace/sysfs_write.c b/userspace/sysfs_write.c
deleted file mode 100644
index 9f91632..0000000
--- a/userspace/sysfs_write.c
+++ /dev/null
@@ -1,9 +0,0 @@
-#include <stdio.h>
-int main()
-{
-    FILE *f=fopen("/sys/mem","w");
-    uint32_t data=0xaabbccdd;
-    fwrite(&data,4,1,f);
-//    fclose(f); // not automatically by newlib?
-//    fflush(f);
-}
diff --git a/userspace/task1.c b/userspace/task1.c
index 793b7f8..e220424 100644
--- a/userspace/task1.c
+++ b/userspace/task1.c
@@ -7,7 +7,6 @@ static ULL fib1_cached_value=0;
 static ULL fib2_cached_index=1;
 static ULL fib2_cached_value=1;
 
-
 ULL fib(ULL i)
 {
     if(i==0)return 0;
diff --git a/userspace/test-math.c b/userspace/test-math.c
deleted file mode 100644
index 9327c19..0000000
--- a/userspace/test-math.c
+++ /dev/null
@@ -1,33 +0,0 @@
-#include <stdio.h>
-#include <string.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <math.h>
-#include <time.h>
-
-int main(int argc, char **argv) 
-{
-     time_t ltime;
-     time(&ltime); 
-     printf("the time is %s", ctime(&ltime));
-
-     unsigned int seed=time(NULL);
-     printf("seed = %u\n",seed);
-
-     srand(seed);
-
-     for(int i=0;i<10;i++)
-     {
-	 int r=rand()%100;
-	 printf ("the random number is %i",r);
-	 printf("sin(%i) = %f \n",r,sin(r));
-     }
-
-
-     return 0;
-}
-
-
-
-
-
diff --git a/userspace/test_env.c b/userspace/test_env.c
new file mode 100644
index 0000000..0a04791
--- /dev/null
+++ b/userspace/test_env.c
@@ -0,0 +1,31 @@
+#include <stdlib.h>
+
+extern char **environ;
+
+int main(int argc, char **argv) 
+{
+
+    printf("argv: 0x%08X\n",argv);
+    printf("env: 0x%08X\n",environ);
+    
+    int i=0;
+    while(environ[i]!=NULL)
+    {
+	printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
+	i++;
+    }
+
+    putenv("supa=dupa");
+    printf("env: 0x%08X\n",environ);
+    
+    i=0;
+    while(environ[i]!=NULL)
+    {
+	printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
+	i++;
+    }
+    
+    return 0;
+}
+
+
diff --git a/userspace/test_math.c b/userspace/test_math.c
new file mode 100644
index 0000000..9327c19
--- /dev/null
+++ b/userspace/test_math.c
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <math.h>
+#include <time.h>
+
+int main(int argc, char **argv) 
+{
+     time_t ltime;
+     time(&ltime); 
+     printf("the time is %s", ctime(&ltime));
+
+     unsigned int seed=time(NULL);
+     printf("seed = %u\n",seed);
+
+     srand(seed);
+
+     for(int i=0;i<10;i++)
+     {
+	 int r=rand()%100;
+	 printf ("the random number is %i",r);
+	 printf("sin(%i) = %f \n",r,sin(r));
+     }
+
+
+     return 0;
+}
+
+
+
+
+
diff --git a/userspace/test_sysfs.c b/userspace/test_sysfs.c
new file mode 100644
index 0000000..9f91632
--- /dev/null
+++ b/userspace/test_sysfs.c
@@ -0,0 +1,9 @@
+#include <stdio.h>
+int main()
+{
+    FILE *f=fopen("/sys/mem","w");
+    uint32_t data=0xaabbccdd;
+    fwrite(&data,4,1,f);
+//    fclose(f); // not automatically by newlib?
+//    fflush(f);
+}
-- 
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