wip(termosh); strspn strpbrk and strtok in string.h;

CMakeLists.txt

@@ -42,7 +42,7 @@ if(MCOPY_EXE AND MKFS_EXE AND CPIO_EXE)
         COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_BINARY_DIR}
         COMMAND sh -c "find . -mindepth 1 ! -name '*.cpio' -print0 | ${CPIO_EXE} --null -ov -H newc > \"${INITRAMFS_CPIO_FILE}\""
         WORKING_DIRECTORY ${INITRAMFS_SRC_DIR}
-        DEPENDS ${INIT_FILES} init debug
+        DEPENDS ${INIT_FILES} init debug termosh
         VERBATIM
         COMMENT "Packing initramfs to cpio..."
     )

ROADMAP.md

@@ -23,7 +23,7 @@
 
 ### v0.5.4 (The Shell Update)
 *Focus: Interactive Userspace*
-- [ ] **Userspace Shell (`ush`)**
+- [ ] **Userspace Shell (`termosh`)**
     - Porting `ksh` logic into a standalone `.hot` binary.
     - Standard I/O abstraction (stdin/stdout) to pass keyboard input to active process.
 - [ ] **Basic Utils**

kernel/src/arch/x86_64/interrupts.c

@@ -1,18 +1,30 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 // Copyright (c) 2025 0xKarinyash
 
-#include "drivers/timer.h"
 #include <io.h>
 #include <core/panic.h>
+#include <core/scheduler.h>
 #include <drivers/keyboard.h>
+#include <drivers/console.h>
+#include <drivers/timer.h>
 #include <shell/builtins.h>
+#include <syscalls/proc.h>
 #include <types.h>
 
+extern task* curr_task;
 
 void isr_handler_c(Registers *regs) {
     if (regs->int_no == 3) {
         return print_regs();
     }
+    if ((regs->cs & 3) != 0) {
+        kprintf("\n[Dewar] Process '%s' (PID %d) Segmentation Fault at %X\n", 
+                curr_task->proc->name, curr_task->proc->pid, regs->rip);
+        curr_task->task_state = DEAD;
+        sys_exit(-1);
+        sched_next((u64)regs);
+        return;
+    }
     panic_exception(regs);
 }
 

userspace/CMakeLists.txt

@@ -9,4 +9,5 @@ message(STATUS "Building termOS's userspace")
 
 add_subdirectory(libterm)
 add_subdirectory(init)
-add_subdirectory(debug)
+add_subdirectory(debug)
+add_subdirectory(termosh)

userspace/init/src/main.c

@@ -6,9 +6,7 @@
 #include <malloc.h>
 
 int main() {
-    wait(spawn("debug"));
-    printf("\nStill here?\n");
-    while (1) {
-        printf("1");
-    }
+    wait(spawn("termosh")); // TODO: read .cfg and spawn what stated there
+    printf("\nbaiii");
+    return 0;
 }

userspace/libterm/inc/string.h

@@ -10,4 +10,7 @@ i32 strcmp(const char *s1, const char *s2);
 i32 strncmp(const char* s1, const char* s2, u64 n);
 char* strcpy(char* dest, const char* src);
 char* strncpy(char* dest, const char* src, u64 n);
-u64 strlen(const char* str);
+u64 strlen(const char* str);
+u64 strspn(const char* s, const char* accept);
+char* strpbrk(const char* s, const char* accept);
+char* strtok(char *s, const char* delim);

userspace/libterm/src/string.c

@@ -3,6 +3,8 @@
 
 #include <string.h>
 
+static char* olds;
+
 void *memset(void *ptr, int value, usize num) {
     u8 *p = (u8 *)ptr;
     while (num--) {
@@ -74,4 +76,51 @@ u64 strlen(const char* str) {
     u64 res = 0;
     for (res = 0; str[res]; res++);
     return res;
+}
+
+static inline int is_in_set(char c, const char* set) {
+    while (*set) {
+        if (*set == c) return 1;
+        set++;
+    }
+    return 0;
+}
+
+u64 strspn(const char* s, const char* accept) {
+    u64 count = 0;
+    while (*s && is_in_set(*s, accept)) {
+        count++;
+        s++;
+    }
+    return count;
+}
+
+char* strpbrk(const char* s, const char* accept) {
+    while (*s) {
+        if (is_in_set(*s, accept)) {
+            return (char*)s;
+        }
+        s++;
+    }
+    return nullptr;
+}
+// took from https://github.com/walac/glibc/blob/master/string/strtok.c
+char* strtok(char *s, const char* delim) {
+    char* token;
+    if (s == nullptr) s = olds;
+    s += strspn(s, delim);
+    if (*s == '\0') {
+        olds = s;
+        return nullptr;
+    }
+
+    token = s;
+    s = strpbrk(token, delim);
+    if (s == nullptr) olds = token + strlen(token);
+    else {
+        *s = '\0';
+        olds = s + 1;
+    }
+
+    return token;
 }

userspace/termosh/CMakeLists.txt

@@ -0,0 +1,9 @@
+cmake_minimum_required(VERSION 3.20)
+project(termOSh LANGUAGES C)
+
+file(GLOB_RECURSE TERMOSH_SOURCES "src/*.c")
+
+add_termos_executable(termosh "${TERMOSH_SOURCES}")
+target_include_directories(termosh PRIVATE
+    "${CMAKE_CURRENT_SOURCE_DIR}/inc"
+)

userspace/termosh/inc/handlers.h

@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#pragma once
+
+void not_implemented_yet();

userspace/termosh/inc/parser.h

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#pragma once
+
+#include "tokens.h"
+
+termosh_token char2token(char* token);
+int tokenize(char* buffer, char* tokens[], int max_tokens);

userspace/termosh/inc/tokens.h

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#pragma once
+
+typedef enum {
+    TOKEN_EMPTY,
+    TOKEN_NULL,
+    TOKEN_ILLEGAL,
+
+    TOKEN_QUIT,
+    TOKEN_CLEAR,
+    TOKEN_HELP,
+    TOKEN_SPAWN,
+    
+} termosh_token;

userspace/termosh/src/handlers/misc.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void not_implemented_yet() {
+    printf("Not implemented yet!\n");
+}

userspace/termosh/src/main.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+
+#include "tokens.h"
+#include "parser.h"
+#include "handlers.h"
+
+#include <stdio.h>
+
+#define BUFFER_SIZE 512
+
+int main() {
+    while (true) {
+        printf("termosh_> ");
+        char cmdbuff[BUFFER_SIZE];
+        gets_s(cmdbuff, BUFFER_SIZE);
+        char* tokens[BUFFER_SIZE];
+        int tokens_count = tokenize(cmdbuff, tokens, BUFFER_SIZE);
+        if (tokens_count < 1) continue;
+        termosh_token token = char2token(tokens[0]);
+        switch (token) {
+            case TOKEN_QUIT: return 0;
+            case TOKEN_CLEAR: not_implemented_yet(); break;
+            case TOKEN_HELP: not_implemented_yet(); break;
+            case TOKEN_SPAWN: not_implemented_yet(); break;
+            default: printf("Unknown command\n"); break;
+        }
+    }
+}

userspace/termosh/src/modules/parser.c

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright (c) 2026 0xKarinyash
+#include <string.h>
+
+#include "parser.h"
+#include "tokens.h"
+
+static const char* delim = " \t\r\n";
+
+typedef struct {
+    char* str;
+    termosh_token token;
+} termosh_token_map;
+
+static const termosh_token_map token_map[] = {
+    {"q", TOKEN_QUIT},
+    {"quit", TOKEN_QUIT},
+    {"exit", TOKEN_QUIT},
+
+    {"clear", TOKEN_CLEAR},
+
+    {"help", TOKEN_HELP},
+    {"spawn", TOKEN_SPAWN},
+
+    {nullptr, TOKEN_NULL}
+};
+
+termosh_token char2token(char* token) {
+    for (int i = 0; token_map[i].str != nullptr; i++) {
+        if (strcmp(token, token_map[i].str) == 0) {
+            return token_map[i].token;
+        }
+    }
+
+    return TOKEN_ILLEGAL;
+}
+
+int tokenize(char* buffer, char* tokens[], int max_tokens) {
+    char* token = strtok(buffer, delim);
+
+    int i = 0;
+    while (token != nullptr && i < max_tokens) {
+        tokens[i] = token;
+        token = strtok(nullptr, delim);
+        i++;
+    }
+
+    return i;
+}