From 2d91384197847a7e8fe2c3f548918a8277d3086d Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Tue, 18 Sep 2018 03:03:28 +0200
Subject: sysfs, errno, improve foolshell, etc

---
 userspace/foolshell.c | 279 ++++++++++++++++++++++++--------------------------
 1 file changed, 131 insertions(+), 148 deletions(-)

(limited to 'userspace/foolshell.c')

diff --git a/userspace/foolshell.c b/userspace/foolshell.c
index 0012592..e8b384e 100644
--- a/userspace/foolshell.c
+++ b/userspace/foolshell.c
@@ -1,47 +1,45 @@
+/**
+ * @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 <reent.h>
+#include <errno.h>
+#include <string.h>
 
 extern char **environ;
-extern struct _reent *_impure_ptr;
 
-uint8_t buf_test[1024*300];
+bool process(char *buf);
+bool cd(char *path);
 
-//
-void hello()
+void version()
+{
+    puts("Fool's Shell version git-commit:" GIT_REVISION "\ncompiled on " __DATE__ " at " __TIME__);
+}
+void help()
 {
-    // ascci art: http://patorjk.com/software/taag/#p=testall&f=Cards&t=Fool%20OS
-    puts(
-
-    "\033c"
-//    "\033[36m"
-                    
-//    "       ______            __   ____  _____      \n"
-//    "      / ____/___  ____  / /  / __ \\/ ___/     \n"
-//    "     / /_  / __ \\/ __ \\/ /  / / / /\\__ \\   \n"
-//    "    / __/ / /_/ / /_/ / /  / /_/ /___/ /       \n"
-//    "   /_/    \\____/\\____/_/   \\____//____/     \n"
-//    "                                               \n"
-
-//    "\033[37;44m"
-//    "                                               \n"
-
-    "  Welcome to FoolShell v0.12 (Compiled on " __DATE__ " at " __TIME__")\n"
-    "  ------------------------------------------------------------------\n\n"
-    "  Please type 'help' anytime, to show shell \"built-ins\". You can execute \n"
-    "  user programms that are in your $PATH directory by simply typing \n"
-    "  their filenames. Get additional information for many, of the available\n"
-    "  commands by invoking them with --help or -h. (e.g. ls --help) \n"
-    "                                               \n"
-
-    "\033[37;40m"
-    );
-
-    printf("  Your $PATH is currently set to: %s\n",getenv("PATH"));
-    printf("  Type 'ls %s' to list programms on your $PATH.\n\n",getenv("PATH"));
+    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() 
@@ -49,23 +47,32 @@ 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) 
 {
-    bool silent=false;
     for(int i=0;i<argc;i++)
     {
-	if(!strcmp(argv[i],"--silent"))silent=true;
+	if(!strcmp(argv[i],"--version"))
+	{
+	    version();
+	    return 0;
+	}
+
+	if(!strcmp(argv[i],"--help"))
+	{
+	    help();
+	    return 0;
+	}
     }
-    
-    if(!silent)hello();
 
     char *buf=calloc(sizeof(char),256);
 
+    // input and output without buffering
     setvbuf(stdin,NULL,_IONBF,0);
     setvbuf(stdout,NULL,_IONBF,0);
 
-    while(1)
+    printf("\033c"); // clear screen
+
+    while(1) // process commands until exit
     {
 	prompt();
 	int bl=0;
@@ -89,19 +96,18 @@ int main(int argc, char **argv)
 	    }
 	}
 
-        //fgets(buf,255,stdin);
-	//buf[strlen(buf)-1]=0; // remove \n
-	//printf("[%s]",buf);
-	process(buf);
+	if(!process(buf))break; // process input and return if exit
     }
 
     return 0;
 }
 
-char **tokenize(char *buf)
+// 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);
 
@@ -114,13 +120,13 @@ char **tokenize(char *buf)
 	token[c]=malloc(256);
 
 	//skip all the whitespace
-	while(buf[i]==' '&&i<l)i++;
+	while(buf[i]==chr&&i<l)i++;
 	if(i==l)break;
 
 	//get token
 	int t=0;
 
-	while(buf[i]!=' '&&i<l)
+	while(buf[i]!=chr&&i<l)
 	{
 	    token[c][t]=buf[i];
 	    t++;
@@ -136,129 +142,106 @@ char **tokenize(char *buf)
     return token;
 }
 
-int process(char *buf)
+bool process(char *buf)
 {
-    char **token=tokenize(buf);
+    char **token=tokenize(buf,' ');
     char *command=token[0];
-  //  puts(command);
-    // copied from trottelshell
-
-    if(!strcmp(command,"help"))
-    {
-        puts(   "\nfoolshell: supported built-in commands:\n\n" 
-                "'help'                      - show this message\n"
-                "'echo [string]'             - print given string to stdout\n"
-                "'getenv [var]'              - show environment variable\n"
-                "'putenv/setenv [var] [val]' - set environemnet variable\n"
-                "'env'                       - show all environment variables\n"
-                "'cd [dir]'                  - change directory (set $PWD)\n"
-                "'exit'                      - exit running foolshell\n\n");
-    }
 
-    else if(!strcmp(command,"cd"))
+    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"))
     {
-	char *dir=getenv("PWD");
-
-	char buf[256];
-
-	if(token[1][0]!='/')
-	{
-	    sprintf(buf,"%s%s%s",dir,dir[0]=='/'&&dir[1]==0?"":"/",token[1]);
-	}
-	else
-	{
-	    sprintf(buf,"%s",token[1]);
-	}
-
-	char token[10];
-
-	//adjust pwd (resolve '..' and '.')
-////	printf("adjusting pwd: '%s'\n",buf);
-	int left=1;
-	int right=0;
-
-	do{
-
-	    int t=0;
-	    do
-	    {
-		right++;
-		token[t]=buf[right];
-
-		t++;
-	    }
-	    while(buf[right]!=0&&buf[right]!='/');
-	    token[t-1]=0;
-	    
-//	    printf("path token: '%s'\n",token);
-	    
-	    if(!strcmp(token,".."))
-	    {
-		left--;
-		while(buf[left]!='/')left--;
-	    }
-	    else if(!strcmp(token,"."))
-	    {
-	    }
-	    else
-	    {
-		int i=0;
-		if(left!=1)buf[left++]='/';
-		do{buf[left++]=token[i++];}while(token[i]!=0);
-	    }
-
-	}while(buf[right]!=0);
-	buf[left]=0;
-//	printf("adjusted: '%s'\n",buf);
-	if(buf[0]==0)setenv("PWD","/",1);
-	else setenv("PWD",buf,1);
-    }
-    else if(!strcmp(command,"exit"))
-    {
-	_exit(1);
-    }
-    else if(!strcmp(command,"echo"))
-    {
-	printf("\"%s\"\n",token[1]);
-
-    }
-    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,"putenv")||!strcmp(command,"setenv"))
-    {
-	char buf[256];
 	sprintf(buf,"%s=%s",token[1],token[2]);
 	putenv(buf);
-	printf("(0x%08X) set: '%s' = '%s' \n",environ,token[1],getenv(token[1]));
+	//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);
+//	printf("env: 0x%08X\n",environ);
 	while(environ[i]!=NULL)
 	{
-	    printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
+//	    printf("envvar %s (0x%08X)\n" ,environ[i],environ[i]);
+	    printf("%s\n" ,environ[i]);
 	    i++;
 	}
     }
-    else
+    else // otherwise treat command as exectutable and send to execve
     {
 	int pid=_fork();
 
 	if(pid==0)
 	{
-	    sprintf(buf,"%s",token[0]);
-	    _execve(buf,token,environ);
-	    sprintf(buf,"%s/%s",getenv("PATH"),token[0]);
+	    if(token[0][0]=='/')sprintf(buf,"%s",token[0]);
+	    else sprintf(buf,"%s/%s",getenv("PATH"),token[0]);
 	    _execve(buf,token,environ);
-	    puts("foolshell: command not found");
-	    exit(0);
+	    printf("foolshell: %s (errno: %d)\n",strerror(errno),errno);
+	    return false;
 	}
 	
-	if(token[1]==NULL||strcmp(token[1],"branch"))_wait(pid);
+	if(token[1]==NULL||strcmp(token[1],"&"))_wait(pid);
 
     }
-    return 0;
+    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);
 }
-- 
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