doom is now using the native api, add a PEB + TEB to replace the dummy and the awkward argument passing to processes, all allocations are zeroed because i had enough, small readme changes and dedication.

code/shell_posix/shell_posix.c

@@ -2,6 +2,7 @@
 #include <stddef.h>
 #include <stdbool.h>
 #include <string.h>
+#include <syscall.h>
 
 #define MAX_CMD 256
 #define NAME_MAX 259
@@ -21,7 +22,8 @@ extern int unlink(const char *pathname);
 extern int posix_spawn(int *pid, const char *path, const void *act, const void *attr, char *const argv[], char *const envp[]);
 extern int waitpid(int pid, int *status, int options);
 extern void exit(int status);
-extern int ClearConsoleScreenBuffer(void* h);
+extern void clearscreen(void);
+extern void clearkeyboard(void);
 extern void PosixFdInit(void);
 
 static int hIn = 0; static int hOut = 1;
@@ -52,6 +54,31 @@ static void readLine(char* buf, int len) {
     buf[pos] = '\0';
 }
 
+
+static int splitCommandLine(char* line, char** argv, int maxArgv) {
+    int argc = 0;
+    char* p = line;
+
+    while (*p && argc < maxArgv - 1) {
+        while (*p == ' ' || *p == '\t') p++;
+        if (!*p) break;
+
+        if (*p == '"') {
+            p++;
+            argv[argc++] = p;
+            while (*p && *p != '"') p++;
+            if (*p) *p++ = '\0';
+        } else {
+            argv[argc++] = p;
+            while (*p && *p != ' ' && *p != '\t') p++;
+            if (*p) *p++ = '\0';
+        }
+    }
+
+    argv[argc] = NULL;
+    return argc;
+}
+
 static char* trim(char* s) {
     while (*s == ' ') s++;
     int len = (int)strlen(s);
@@ -111,25 +138,40 @@ static int runCommand(const char* cmd) {
     if (!cmd || *cmd == '\0') return 0;
     if (strcmp(cmd, "exit") == 0) return 1;
     if (strcmp(cmd, "help") == 0) { cmd_help(); return 0; }
-    if (strcmp(cmd, "clear") == 0) { ClearConsoleScreenBuffer(0); return 0; }
+    if (strcmp(cmd, "clear") == 0) { clearscreen(); return 0; }
     if (strcmp(cmd, "crash") == 0) { *(int*)0 = 42; return 0; }
     if (strcmp(cmd, "dir") == 0) { cmd_dir("."); return 0; }
     if (strncmp(cmd, "dir ", 4) == 0) { cmd_dir(cmd + 4); return 0; }
-    if (strncmp(cmd, "cd ", 3) == 0) { chdir(cmd + 3); return 0; }
+    if (strncmp(cmd, "cd ", 3) == 0) { if (chdir(cmd + 3) != 0) print("cd: failed\n"); return 0; }
     if (strncmp(cmd, "del ", 4) == 0) { unlink(cmd + 4); return 0; }
     if (strncmp(cmd, "type ", 5) == 0) { cmd_type(cmd + 5); return 0; }
     if (strncmp(cmd, "write ", 6) == 0) { cmd_write(cmd + 6); return 0; }
 
-    int pid; char *argv[] = {(char*)cmd, NULL};
-    if (posix_spawn(&pid, cmd, NULL, NULL, argv, NULL) == 0) {
+    char cmdBuf[MAX_CMD];
+    strncpy(cmdBuf, cmd, MAX_CMD - 1);
+    cmdBuf[MAX_CMD - 1] = '\0';
+
+    char* argv[32];
+    int argc = splitCommandLine(cmdBuf, argv, 32);
+    if (argc == 0) return 0;
+
+    int pid;
+    if (posix_spawn(&pid, argv[0], NULL, NULL, argv, NULL) == 0) {
         int status; waitpid(pid, &status, 0);
+        clearkeyboard();
     } else { print("shell: launch failed\n"); }
     return 0;
 }
 
-int main() {
+int main(void) {
     PosixFdInit();
+
+    const char* cmdline = SysGetCommandLine();
     char lineBuf[MAX_CMD];
+
+    print("shell: command line: ");
+    print(cmdline);
+    print("\n");
     print("shell: ready\n");
     while (true) {
         print("> ");