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Makefile

@@ -0,0 +1,25 @@
+CC 			= gcc
+CFLAGS 		= -Wall -Wextra -Iinclude
+
+SRC_DIR 	= src
+BUILD_DIR 	= build
+BIN_DIR 	= bin
+
+SRC_FILES 	= $(wildcard $(SRC_DIR)/*.c)
+OBJ_FILES 	= $(patsubst $(SRC_DIR)/%.c, $(BUILD_DIR)/%.o, $(SRC_FILES))
+TARGET 		= $(BIN_DIR)/main
+
+all: $(TARGET)
+
+$(TARGET): $(OBJ_FILES)
+	@mkdir -p $(BIN_DIR)
+	$(CC) $(OBJ_FILES) -o $@
+
+$(BUILD_DIR)/%.o: $(SRC_DIR)/%.c
+	@mkdir -p $(BUILD_DIR)
+	$(CC) $(CFLAGS) -c $< -o $@
+
+clean:
+	rm -rf $(BUILD_DIR) $(BIN_DIR)
+
+.PHONY: all clean

README.md

@@ -1,2 +1,47 @@
-# SimpleDB
-SimpleDB
+## Simple DB
+
+Simple DB proof of concept that utilizes SQL syntax for REPL.
+
+### Examples
+
+**Loading DB from file**
+
+```
+Simple SQL-like Database
+Copyright (c) 2025 Ivan Nikolskiy, All Rights Reserved.
+
+Supported commands: CREATE TABLE, INSERT INTO, SELECT * FROM, SAVE, LOAD
+
+Enter SQL query: LOAD
+Database loaded from 'database.db'.
+Enter SQL query: SELECT * FROM Students
+Table: Students
+Name     Age     Major  
+Alice    20      CS     
+Bob      20      CS     
+Enter SQL query: EXIT
+```
+
+**Writing your DB to file**
+
+```
+Simple SQL-like Database
+Copyright (c) 2025 Ivan Nikolskiy, All Rights Reserved.
+
+Supported commands: CREATE TABLE, INSERT INTO, SELECT * FROM, SAVE, LOAD
+
+Enter SQL query: CREATE TABLE Students (Name, Age, Major)
+Table 'Students' with 3 columns created successfully.
+Enter SQL query: INSERT INTO Students VALUES (Alice, 20, CS)
+Row inserted into table 'Students'.
+Enter SQL query: INSERT INTO Students VALUES (Bob, 20, CS)
+Row inserted into table 'Students'.
+Enter SQL query: SELECT * FROM Students
+Table: Students
+Name	 Age	 Major
+Alice	 20	 CS
+Bob	 20	 CS
+Enter SQL query: SAVE
+Database saved to 'database.db'.
+Enter SQL query: EXIT
+```

include/db.h

@@ -0,0 +1,43 @@
+#ifndef _DB_H_
+#define _DB_H_
+
+#define MAX_TABLES 10
+#define MAX_COLUMNS 10
+#define MAX_ROWS 100
+#define MAX_QUERY_LENGTH 256
+#define MAX_NAME_LENGTH 50
+#define DB_FILE "database.db"
+
+typedef struct
+{
+    char name[MAX_NAME_LENGTH];
+    char data[MAX_ROWS][MAX_NAME_LENGTH];
+} Column;
+
+typedef struct
+{
+    char name[MAX_NAME_LENGTH];
+    Column columns[MAX_COLUMNS];
+    int column_count;
+    int row_count;
+} Table;
+
+typedef struct
+{
+    Table tables[MAX_TABLES];
+    int table_count;
+} Database;
+
+Database db;
+
+void create_table(const char *table_name, char *columns);
+void insert_into_table(const char *table_name, char *values);
+void select_from_table(const char *table_name);
+void parse_query(const char *query);
+Table *find_table(const char *table_name);
+void save_database_to_file(const char *filename);
+void load_database_from_file(const char *filename);
+int validate_ipv4_address(const char *ip);
+void trim_whitespace(char *str);
+
+#endif

include/linenoise.h

@@ -0,0 +1,113 @@
+/* linenoise.h -- VERSION 1.0
+ *
+ * Guerrilla line editing library against the idea that a line editing lib
+ * needs to be 20,000 lines of C code.
+ *
+ * See linenoise.c for more information.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010-2023, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LINENOISE_H
+#define __LINENOISE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h> /* For size_t. */
+
+extern char *linenoiseEditMore;
+
+/* The linenoiseState structure represents the state during line editing.
+ * We pass this state to functions implementing specific editing
+ * functionalities. */
+struct linenoiseState {
+    int in_completion;  /* The user pressed TAB and we are now in completion
+                         * mode, so input is handled by completeLine(). */
+    size_t completion_idx; /* Index of next completion to propose. */
+    int ifd;            /* Terminal stdin file descriptor. */
+    int ofd;            /* Terminal stdout file descriptor. */
+    char *buf;          /* Edited line buffer. */
+    size_t buflen;      /* Edited line buffer size. */
+    const char *prompt; /* Prompt to display. */
+    size_t plen;        /* Prompt length. */
+    size_t pos;         /* Current cursor position. */
+    size_t oldpos;      /* Previous refresh cursor position. */
+    size_t len;         /* Current edited line length. */
+    size_t cols;        /* Number of columns in terminal. */
+    size_t oldrows;     /* Rows used by last refrehsed line (multiline mode) */
+    int history_index;  /* The history index we are currently editing. */
+};
+
+typedef struct linenoiseCompletions {
+  size_t len;
+  char **cvec;
+} linenoiseCompletions;
+
+/* Non blocking API. */
+int linenoiseEditStart(struct linenoiseState *l, int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt);
+char *linenoiseEditFeed(struct linenoiseState *l);
+void linenoiseEditStop(struct linenoiseState *l);
+void linenoiseHide(struct linenoiseState *l);
+void linenoiseShow(struct linenoiseState *l);
+
+/* Blocking API. */
+char *linenoise(const char *prompt);
+void linenoiseFree(void *ptr);
+
+/* Completion API. */
+typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *);
+typedef char*(linenoiseHintsCallback)(const char *, int *color, int *bold);
+typedef void(linenoiseFreeHintsCallback)(void *);
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback *);
+void linenoiseSetHintsCallback(linenoiseHintsCallback *);
+void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *);
+void linenoiseAddCompletion(linenoiseCompletions *, const char *);
+
+/* History API. */
+int linenoiseHistoryAdd(const char *line);
+int linenoiseHistorySetMaxLen(int len);
+int linenoiseHistorySave(const char *filename);
+int linenoiseHistoryLoad(const char *filename);
+
+/* Other utilities. */
+void linenoiseClearScreen(void);
+void linenoiseSetMultiLine(int ml);
+void linenoisePrintKeyCodes(void);
+void linenoiseMaskModeEnable(void);
+void linenoiseMaskModeDisable(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LINENOISE_H */

src/db.c

@@ -0,0 +1,376 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "db.h"
+
+void trim_whitespace(char *str)
+{
+    char *end;
+
+    while (isspace((unsigned char)*str))
+    {
+        str++;
+    }
+
+    if (*str == 0)
+    {
+        return;
+    }
+
+    end = str + strlen(str) - 1;
+
+    while (end > str && isspace((unsigned char)*end))
+    {
+        end--;
+    }
+
+    end[1] = '\0';
+}
+
+int validate_ipv4_address(const char *ip)
+{
+    int segments;
+    int ch_count;
+    const char *ptr;
+
+    segments = 0;
+    ch_count = 0;
+    ptr = ip;
+
+    while (*ptr)
+    {
+        if (*ptr == '.')
+        {
+            if (ch_count == 0 || ch_count > 3)
+            {
+                return 0;
+            }
+
+            segments++;
+            ch_count = 0;
+        }
+        else if (!isdigit((unsigned char)*ptr))
+        {
+            return 0;
+        }
+        else
+        {
+            ch_count++;
+        }
+
+        ptr++;
+    }
+
+    if (segments != 3 || ch_count == 0 || ch_count > 3)
+    {
+        return 0;
+    }
+
+    return 1;
+}
+
+Table *find_table(const char *table_name)
+{
+    int i;
+
+    for (i = 0; i < db.table_count; i++)
+    {
+        if (strcmp(db.tables[i].name, table_name) == 0)
+        {
+            return &db.tables[i];
+        }
+    }
+
+    return NULL;
+}
+
+void create_table(const char *table_name, char *columns)
+{
+    Table *table;
+    char *token;
+
+    if (db.table_count >= MAX_TABLES)
+    {
+        printf("Error: Maximum table limit reached.\n");
+        return;
+    }
+
+    if (find_table(table_name))
+    {
+        printf("Error: Table '%s' already exists.\n", table_name);
+        return;
+    }
+
+    table = &db.tables[db.table_count++];
+    strcpy(table->name, table_name);
+    table->column_count = 0;
+    table->row_count = 0;
+
+    token = strtok(columns, ",");
+
+    while (token && table->column_count < MAX_COLUMNS)
+    {
+        trim_whitespace(token);
+        strcpy(table->columns[table->column_count++].name, token);
+        token = strtok(NULL, ",");
+    }
+
+    if (table->column_count == 0)
+    {
+        printf("Error: No columns defined for table '%s'.\n", table_name);
+        db.table_count--;
+        return;
+    }
+
+    printf("Table '%s' with %d columns created successfully.\n", table_name, table->column_count);
+}
+
+void insert_into_table(const char *table_name, char *values)
+{
+    Table *table;
+    char *token;
+    int col_index;
+
+    table = find_table(table_name);
+
+    if (!table)
+    {
+        printf("Error: Table '%s' does not exist.\n", table_name);
+        return;
+    }
+
+    if (table->column_count == 0)
+    {
+        printf("Error: Table '%s' has no columns defined.\n", table_name);
+        return;
+    }
+
+    if (table->row_count >= MAX_ROWS)
+    {
+        printf("Error: Maximum row limit reached for table '%s'.\n", table_name);
+        return;
+    }
+
+    token = strtok(values, ",");
+    col_index = 0;
+
+    while (token && col_index < table->column_count)
+    {
+        trim_whitespace(token);
+
+        if (strcmp(table->columns[col_index].name, "IPv4") == 0)
+        {
+            if (!validate_ipv4_address(token))
+            {
+                printf("Error: Invalid IPv4 address '%s'.\n", token);
+                return;
+            }
+        }
+
+        strcpy(table->columns[col_index].data[table->row_count], token);
+        token = strtok(NULL, ",");
+        col_index++;
+    }
+
+    if (col_index != table->column_count)
+    {
+        printf("Error: Column count mismatch for table '%s'.\n", table_name);
+        return;
+    }
+
+    table->row_count++;
+    printf("Row inserted into table '%s'.\n", table_name);
+}
+
+void select_from_table(const char *table_name)
+{
+    Table *table;
+    int i;
+    int j;
+
+    table = find_table(table_name);
+
+    if (!table)
+    {
+        printf("Error: Table '%s' does not exist.\n", table_name);
+        return;
+    }
+
+    printf("Table: %s\n", table->name);
+
+    for (i = 0; i < table->column_count; i++)
+    {
+        printf("%s\t", table->columns[i].name);
+    }
+
+    printf("\n");
+
+    for (i = 0; i < table->row_count; i++)
+    {
+        for (j = 0; j < table->column_count; j++)
+        {
+            printf("%s\t", table->columns[j].data[i]);
+        }
+
+        printf("\n");
+    }
+}
+
+void save_database_to_file(const char *filename)
+{
+    FILE *file;
+
+    file = fopen(filename, "wb");
+
+    if (!file)
+    {
+        printf("Error: Could not open file '%s' for writing.\n", filename);
+        return;
+    }
+
+    fwrite(&db, sizeof(Database), 1, file);
+
+    fclose(file);
+    printf("Database saved to '%s'.\n", filename);
+}
+
+void load_database_from_file(const char *filename)
+{
+    FILE *file;
+
+    file = fopen(filename, "rb");
+
+    if (!file)
+    {
+        printf("Error: Could not open file '%s' for reading.\n", filename);
+        return;
+    }
+
+    fread(&db, sizeof(Database), 1, file);
+
+    fclose(file);
+    printf("Database loaded from '%s'.\n", filename);
+}
+
+void parse_query(const char *query)
+{
+    char query_copy[MAX_QUERY_LENGTH];
+    char *command;
+    char *table_name;
+    char *columns;
+
+    strcpy(query_copy, query);
+    command = strtok(query_copy, " ");
+
+    if (strcmp(command, "CREATE") == 0)
+    {
+        char *next_token = strtok(NULL, " ");
+        if (next_token == NULL || strcmp(next_token, "TABLE") != 0)
+        {
+            printf("Error: Invalid CREATE TABLE syntax.\n");
+            return;
+        }
+
+        table_name = strtok(NULL, " ");
+        if (table_name == NULL)
+        {
+            printf("Error: Table name is missing.\n");
+            return;
+        }
+
+        columns = strchr(query, '(');
+        if (columns == NULL)
+        {
+            printf("Error: Missing column definitions.\n");
+            return;
+        }
+
+        columns++;
+        char *closing_paren = strchr(columns, ')');
+        if (closing_paren == NULL)
+        {
+            printf("Error: Missing closing parenthesis in column definitions.\n");
+            return;
+        }
+
+        *closing_paren = '\0';
+        trim_whitespace(columns);
+
+        if (strlen(columns) == 0)
+        {
+            printf("Error: No columns defined for table '%s'.\n", table_name);
+            return;
+        }
+
+        create_table(table_name, columns);
+    }
+    else if (strcmp(command, "INSERT") == 0)
+    {
+        char *next_token = strtok(NULL, " ");
+        if (next_token == NULL || strcmp(next_token, "INTO") != 0)
+        {
+            printf("Error: Invalid INSERT INTO syntax.\n");
+            return;
+        }
+
+        table_name = strtok(NULL, " ");
+        if (table_name == NULL)
+        {
+            printf("Error: Table name is missing.\n");
+            return;
+        }
+
+        columns = strchr(query, '(');
+        if (columns == NULL)
+        {
+            printf("Error: Missing values.\n");
+            return;
+        }
+
+        columns++;
+        char *closing_paren = strchr(columns, ')');
+        if (closing_paren == NULL)
+        {
+            printf("Error: Missing closing parenthesis in values.\n");
+            return;
+        }
+
+        *closing_paren = '\0';
+        trim_whitespace(columns);
+
+        if (strlen(columns) == 0)
+        {
+            printf("Error: No values provided for table '%s'.\n", table_name);
+            return;
+        }
+
+        insert_into_table(table_name, columns);
+    }
+    else if (strcmp(command, "SELECT") == 0)
+    {
+        strtok(NULL, " ");
+        strtok(NULL, " ");
+        table_name = strtok(NULL, " ");
+        if (table_name == NULL)
+        {
+            printf("Error: Table name is missing in SELECT query.\n");
+            return;
+        }
+
+        select_from_table(table_name);
+    }
+    else if (strcmp(command, "SAVE") == 0)
+    {
+        save_database_to_file(DB_FILE);
+    }
+    else if (strcmp(command, "LOAD") == 0)
+    {
+        load_database_from_file(DB_FILE);
+    }
+    else
+    {
+        printf("Error: Unsupported query.\n");
+    }
+}

src/main.c

@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "linenoise.h"
+#include "db.h"
+
+int main()
+{
+    char *query;
+
+    db.table_count = 0;
+
+    printf("Simple SQL-like Database\n");
+    printf("Copyright (c) 2025 Ivan Nikolskiy, All Rights Reserved.\n\n");
+    printf("Supported commands: CREATE TABLE, INSERT INTO, SELECT * FROM, SAVE, LOAD\n\n");
+
+    while (1)
+    {
+        query = linenoise("Enter SQL query: ");
+        if (!query)
+        {
+            break;
+        }
+
+        trim_whitespace(query);
+
+        if (strcmp(query, "EXIT") == 0)
+        {
+            free(query);
+            break;
+        }
+
+        if (strlen(query) > 0)
+        {
+            parse_query(query);
+            linenoiseHistoryAdd(query);
+        }
+
+        free(query);
+    }
+
+    return 0;
+}