313 lines
8.2 KiB
C
313 lines
8.2 KiB
C
#include <windows.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#include <string.h>
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// !Made-up! clear console api.
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BOOL ClearConsoleScreenBuffer(HANDLE hConsole);
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// ---------------------------------------------------------------------------
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// Global handles
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// ---------------------------------------------------------------------------
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static HANDLE hIn = INVALID_HANDLE_VALUE;
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static HANDLE hOut = INVALID_HANDLE_VALUE;
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// ---------------------------------------------------------------------------
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// Output helpers
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// ---------------------------------------------------------------------------
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static void print(const char* s) {
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DWORD written;
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// Write to the actual console window
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if (hOut != INVALID_HANDLE_VALUE) {
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WriteConsoleA(hOut, s, (DWORD)strlen(s), &written, 0);
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} else {
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OutputDebugStringA(s);
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}
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}
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static void printUInt(uint32_t n) {
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char buf[12];
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int i = 0;
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if (n == 0) { print("0"); return; }
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while (n > 0) { buf[i++] = (char)('0' + n % 10); n /= 10; }
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char rev[12];
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int j = 0;
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while (i > 0) rev[j++] = buf[--i];
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rev[j] = '\0';
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print(rev);
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}
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static void printInt(int32_t n) {
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char buf[12];
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int i = 0;
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uint32_t val = (n < 0) ? (print("-"), (uint32_t)-(n + 1) + 1) : (uint32_t)n;
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if (val == 0) { print("0"); return; }
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while (val > 0) {
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buf[i++] = (char)('0' + (val % 10));
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val /= 10;
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}
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while (i > 0) {
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char c[2] = { buf[--i], '\0' };
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print(c); // Assumes print() handles strings
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}
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}
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// ---------------------------------------------------------------------------
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// Line editor
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// ---------------------------------------------------------------------------
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#define MAX_CMD 256
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static void readLine(char* buf, int len) {
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int pos = 0;
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while (true) {
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char c;
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DWORD nRead;
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ReadConsoleA(hIn, &c, 1, &nRead, 0);
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if (!nRead) continue;
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if (c == '\r' || c == '\n') {
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print("\n");
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break;
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}
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if ((c == '\b' || c == 127) && pos > 0) {
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pos--;
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print("\b \b");
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continue;
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}
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if (c < 0x20 || c == 127)
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continue;
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if (pos < len - 1) {
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buf[pos++] = c;
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char echo[2] = { c, '\0' };
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print(echo);
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}
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}
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buf[pos] = '\0';
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}
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static char* trim(char* s) {
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while (*s == ' ') s++;
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int len = (int)strlen(s);
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while (len > 0 && s[len - 1] == ' ') len--;
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s[len] = '\0';
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return s;
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}
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// ---------------------------------------------------------------------------
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// Built-in commands
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// ---------------------------------------------------------------------------
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static void cmd_help() {
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print("Available commands:\n"
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" help - Show this list\n"
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" dir - List files in current directory\n"
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" cd <path> - Change directory\n"
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" type <file> - Display file contents\n"
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" del <file> - Delete a file\n"
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" write <file> <tx> - Create a file with text\n"
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" exit - Close the shell\n");
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}
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static void cmd_write(const char* args) {
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char filename[MAX_PATH];
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int i = 0;
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// Parse filename (up to first space)
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while (args[i] != ' ' && args[i] != '\0' && i < MAX_PATH - 1) {
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filename[i] = args[i];
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i++;
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}
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filename[i] = '\0';
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if (args[i] == '\0' || args[i+1] == '\0') {
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print("write: usage: write <filename> <text>\n");
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return;
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}
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const char* text = args + i + 1; // Content starts after the space
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HANDLE hFile = CreateFileA(filename, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, 0, 0);
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if (hFile == INVALID_HANDLE_VALUE) {
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print("write: could not create file\n");
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return;
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}
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DWORD written;
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if (!WriteFile(hFile, text, (DWORD)strlen(text), &written, 0)) {
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print("write: error writing to file\n");
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} else {
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print("File written successfully.\n");
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}
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CloseHandle(hFile);
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}
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static void cmd_dir() {
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WIN32_FIND_DATAA fd;
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HANDLE hFind = FindFirstFileA("*", &fd);
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if (hFind == INVALID_HANDLE_VALUE) {
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print("dir: failed to read directory\n");
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return;
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}
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do {
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if (fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
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print("<DIR> ");
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} else {
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print(" ");
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}
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print(fd.cFileName);
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print("\n");
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} while (FindNextFileA(hFind, &fd));
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FindClose(hFind);
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}
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static void cmd_type(const char* filename) {
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HANDLE hFile = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, 0, 0);
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if (hFile == INVALID_HANDLE_VALUE) {
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print("type: could not open '");
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print(filename);
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print("'\n");
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return;
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}
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char buffer[512];
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DWORD bytesRead;
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while (ReadFile(hFile, buffer, sizeof(buffer) - 1, &bytesRead, 0) && bytesRead > 0) {
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buffer[bytesRead] = '\0';
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print(buffer);
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}
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CloseHandle(hFile);
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print("\n");
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}
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// ---------------------------------------------------------------------------
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// Run one command. Returns 1 if the shell should exit.
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// ---------------------------------------------------------------------------
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static int runCommand(const char* cmd) {
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if (!cmd || *cmd == '\0')
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return 0;
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// --- Built-in commands ---
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if (strcmp(cmd, "exit") == 0) {
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return 1;
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}
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if (strcmp(cmd, "help") == 0) {
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cmd_help();
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return 0;
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}
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if (strcmp(cmd, "clear") == 0) {
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ClearConsoleScreenBuffer(hOut);
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return 0;
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}
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if (strcmp(cmd, "dir") == 0) {
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cmd_dir();
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return 0;
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}
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if (strncmp(cmd, "cd ", 3) == 0) {
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const char* path = cmd + 3;
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if (!SetCurrentDirectoryA(path)) {
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print("cd: failed to change directory to '");
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print(path);
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print("'\n");
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}
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return 0;
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}
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if (strncmp(cmd, "del ", 4) == 0) {
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const char* file = cmd + 4;
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if (!DeleteFileA(file)) {
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print("del: failed to delete '");
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print(file);
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print("'\n");
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}
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return 0;
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}
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if (strncmp(cmd, "type ", 5) == 0) {
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cmd_type(cmd + 5);
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return 0;
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}
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if (strncmp(cmd, "write ", 6) == 0) {
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cmd_write(cmd + 6);
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return 0;
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}
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// --- External Process Execution ---
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STARTUPINFOA si;
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PROCESS_INFORMATION pi;
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unsigned char* p = (unsigned char*)&si;
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for (size_t i = 0; i < sizeof(si); i++) p[i] = 0;
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si.cb = (DWORD)sizeof(si);
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// CreateProcessA requires a mutable buffer for the command line argument
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char cmdBuf[MAX_CMD];
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strncpy(cmdBuf, cmd, MAX_CMD - 1);
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cmdBuf[MAX_CMD - 1] = '\0';
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if (!CreateProcessA(0, cmdBuf, 0, 0, 0, 0, 0, 0, &si, &pi)) {
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print("shell: could not launch '");
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print(cmd);
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print("', error code: ");
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printUInt(GetLastError());
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print("\n");
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return 0;
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}
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WaitForSingleObject(pi.hProcess, INFINITE);
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FlushConsoleInputBuffer(hOut);
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DWORD exitCode = 0;
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GetExitCodeProcess(pi.hProcess, &exitCode);
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CloseHandle(pi.hProcess);
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CloseHandle(pi.hThread);
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if (exitCode != 0) {
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print("shell: '");
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print(cmd);
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print("' exited with code ");
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printInt(exitCode);
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print("\n");
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}
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return 0;
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}
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// ---------------------------------------------------------------------------
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// Entry point
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// ---------------------------------------------------------------------------
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int main(const char* cmdline) {
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hIn = GetStdHandle(STD_INPUT_HANDLE);
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hOut = GetStdHandle(STD_OUTPUT_HANDLE);
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char lineBuf[MAX_CMD];
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print("shell: ready\n");
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print(cmdline);
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print("\n");
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while (true) {
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print("> ");
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readLine(lineBuf, MAX_CMD);
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if (runCommand(trim(lineBuf)))
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break;
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}
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print("shell: goodbye\n");
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ExitProcess(0);
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}
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