Add the tester

tools/init.c

@@ -0,0 +1,205 @@
+#include <stdio.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/reboot.h>
+
+#define FILENAME_BUFFER_SIZE 256
+
+size_t read_command(int descriptor, char *command_buffer)
+{
+    ssize_t bytes_read = 0;
+    size_t read_so_far = 0;
+
+    while ((bytes_read = read(descriptor, command_buffer + read_so_far, FILENAME_BUFFER_SIZE - read_so_far - 1)) > 0)
+    {
+        read_so_far += bytes_read;
+        if (read_so_far >= FILENAME_BUFFER_SIZE - 1)
+        {
+            break;
+        }
+    }
+    command_buffer[read_so_far] = 0;
+    return read_so_far;
+}
+
+enum status
+{
+    status_success,
+    status_failure,
+    status_warning,
+    status_fatal
+};
+
+unsigned int make_path(char *destination, const char *directory, const char *filename, const char *extension)
+{
+    unsigned int i = 0;
+
+    for (; i < FILENAME_BUFFER_SIZE; i++)
+    {
+        if (directory[i] == 0)
+        {
+            break;
+        }
+        destination[i] = directory[i];
+    }
+    for (int j = 0; i < FILENAME_BUFFER_SIZE; i++, j++)
+    {
+        if (filename[j] == 0)
+        {
+            break;
+        }
+        destination[i] = filename[j];
+    }
+    if (extension == NULL)
+    {
+        goto done;
+    }
+    for (int j = 0; i < FILENAME_BUFFER_SIZE; i++, j++)
+    {
+        if (extension[j] == 0)
+        {
+            break;
+        }
+        destination[i] = extension[j];
+    }
+done:
+    destination[i] = 0;
+
+    return i;
+}
+
+enum status run_test(const char *file_entry_name)
+{
+    printf("Running %s. ", file_entry_name);
+
+    char filename[FILENAME_BUFFER_SIZE];
+    char command_buffer[FILENAME_BUFFER_SIZE];
+    char file_buffer[256];
+    int pipe_ends[2];
+
+    if (pipe(pipe_ends) == -1)
+    {
+        perror("pipe");
+        return status_fatal;
+    }
+    make_path(filename, "./tests/", file_entry_name, NULL);
+
+    int child_pid = fork();
+    if (child_pid == -1)
+    {
+        return status_fatal;
+    }
+    else if (child_pid == 0)
+    {
+        close(STDIN_FILENO);
+        close(STDERR_FILENO);
+        close(pipe_ends[0]); // Close the read end.
+
+        if (dup2(pipe_ends[1], STDOUT_FILENO) == -1)
+        {
+            perror("dup2");
+        }
+        else
+        {
+            execl(filename, filename);
+            perror("execl");
+        }
+        close(STDOUT_FILENO);
+        close(pipe_ends[1]);
+        _exit(1);
+    }
+    else
+    {
+        close(pipe_ends[1]); // Close the write end.
+        read_command(pipe_ends[0], command_buffer);
+        close(pipe_ends[0]);
+
+        int wait_status = 0;
+        wait(&wait_status);
+
+        make_path(filename, "./expectations/", file_entry_name, ".txt");
+
+        FILE *expectation_descriptor = fopen(filename, "r");
+
+        if (expectation_descriptor == NULL)
+        {
+            return status_warning;
+        }
+        size_t read_from_file = fread(file_buffer, 1, sizeof(file_buffer) - 1, expectation_descriptor);
+        fclose(expectation_descriptor);
+
+        file_buffer[read_from_file] = 0;
+        for (unsigned int i = 0; ; ++i)
+        {
+            if (command_buffer[i] == 0 && file_buffer[i] == 0)
+            {
+                fwrite("\n", 1, 1, stdout);
+                return status_success;
+            }
+            else if (command_buffer[i] != file_buffer[i])
+            {
+                printf("Failed. Got:\n%s", command_buffer);
+                return status_failure;
+            }
+        }
+    }
+}
+
+struct summary
+{
+    size_t total;
+    size_t failure;
+    size_t success;
+};
+
+void walk()
+{
+    DIR *directory_stream = opendir("./tests");
+    struct dirent *file_entry;
+
+    struct summary test_summary = { .total = 0, .failure = 0, .success = 0 };
+
+    while ((file_entry = readdir(directory_stream)) != NULL)
+    {
+        if (file_entry->d_name[0] == '.')
+        {
+            continue;
+        }
+        ++test_summary.total;
+        switch (run_test(file_entry->d_name))
+        {
+            case status_failure:
+                ++test_summary.failure;
+                break;
+            case status_success:
+                ++test_summary.success;
+                break;
+            case status_warning:
+                break;
+            case status_fatal:
+                goto end_walk;
+        }
+    }
+    printf("Successful: %lu, Failed: %lu, Total: %lu.\n",
+            test_summary.success, test_summary.failure, test_summary.total);
+end_walk:
+    closedir(directory_stream);
+}
+
+int main()
+{
+    int dev_console = open("/dev/console", O_WRONLY);
+    if (dev_console != -1)
+    {
+        dup2(dev_console, STDOUT_FILENO);
+        walk();
+        close(dev_console);
+    }
+    sync();
+    reboot(RB_POWER_OFF);
+
+    return 1;
+}