update C snipplets

added Ruby
fix Solar2D path
ignore `haarcascade_frontalface_default.xml` file

.editorconfig

@@ -20,6 +20,11 @@ indent_size = 4
 indent_style = space
 indent_size = 4
 
+# Ruby
+[*.rb]
+indent_style = space
+indent_size = 2
+
 # Crystal
 [{*.cr,shards.yml}]
 indent_style = space
@@ -85,13 +90,16 @@ indent_size = 4
 indent_style = tab
 indent_size = 4
 
-[snipplets/code/Gambas/*]
+[code/Gambas/*]
 indent_size = 2
 
-[snipplets/projects/Solar2D**]
+[projects/Solar2D/**]
 indent_style = unset
 indent_size = unset
 end_of_line = unset
 charset = unset
 trim_trailing_whitespace = unset
 insert_final_newline = unset
+
+[projects/CV/haarcascade_frontalface_default.xml]
+indent_size = unset

code/C/AF_INET_sockets/echo_client.c

@@ -9,30 +9,29 @@
 char message[] = "Hello there!\n";
 char buf[sizeof(message)];
 
-int main()
-{
-    int sock;
-    struct sockaddr_in addr;
+int main() {
+  int sock;
+  struct sockaddr_in addr;
 
-    sock = socket(AF_INET, SOCK_STREAM, 0);
-    if (sock < 0) {
-        perror("socket");
-        exit(1);
-    }
+  sock = socket(AF_INET, SOCK_STREAM, 0);
+  if (sock < 0) {
+    perror("socket");
+    exit(1);
+  }
 
-    addr.sin_family = AF_INET;
-    addr.sin_port = htons(3425); // или любой другой порт...
-    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
-    if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
-        perror("connect");
-        exit(2);
-    }
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(3425); // или любой другой порт...
+  addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+  if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+    perror("connect");
+    exit(2);
+  }
 
-    send(sock, message, sizeof(message), 0);
-    recv(sock, buf, sizeof(message), 0);
+  send(sock, message, sizeof(message), 0);
+  recv(sock, buf, sizeof(message), 0);
 
-    printf(buf);
-    close(sock);
+  printf(buf);
+  close(sock);
 
-    return 0;
+  return 0;
 }

code/C/AF_INET_sockets/echo_server.c

@@ -5,44 +5,44 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 
-int main()
-{
-    int sock, listener;
-    struct sockaddr_in addr;
-    char buf[1024];
-    int bytes_read;
+int main() {
+  int sock, listener;
+  struct sockaddr_in addr;
+  char buf[1024];
+  int bytes_read;
 
-    listener = socket(AF_INET, SOCK_STREAM, 0);
-    if (listener < 0) {
-        perror("socket");
-        exit(1);
+  listener = socket(AF_INET, SOCK_STREAM, 0);
+  if (listener < 0) {
+    perror("socket");
+    exit(1);
+  }
+
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(3425);
+  addr.sin_addr.s_addr = htonl(INADDR_ANY);
+  if (bind(listener, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+    perror("bind");
+    exit(2);
+  }
+
+  listen(listener, 1);
+
+  while (1) {
+    sock = accept(listener, NULL, NULL);
+    if (sock < 0) {
+      perror("accept");
+      exit(3);
     }
 
-    addr.sin_family = AF_INET;
-    addr.sin_port = htons(3425);
-    addr.sin_addr.s_addr = htonl(INADDR_ANY);
-    if (bind(listener, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
-        perror("bind");
-        exit(2);
+    while (1) {
+      bytes_read = recv(sock, buf, 1024, 0);
+      if (bytes_read <= 0)
+        break;
+      send(sock, buf, bytes_read, 0);
     }
 
-    listen(listener, 1);
+    close(sock);
+  }
 
-    while(1) {
-        sock = accept(listener, NULL, NULL);
-        if (sock < 0) {
-            perror("accept");
-            exit(3);
-        }
-
-        while(1) {
-            bytes_read = recv(sock, buf, 1024, 0);
-            if (bytes_read <= 0) break;
-            send(sock, buf, bytes_read, 0);
-        }
-
-        close(sock);
-    }
-
-    return 0;
+  return 0;
 }

code/C/Parsing/CSV/read_csv.c

@@ -0,0 +1,31 @@
+#include <stdio.h>  // file handling functions
+#include <stdlib.h> // atoi
+#include <string.h> // strtok
+
+int main() {
+  char buffer[80];
+  FILE *stream = fopen("example.csv", "r");
+
+  while (fgets(buffer, 80, stream)) {
+    char *token = strtok(buffer, ",");
+
+    // If you only need the first column of each row
+    // Если нам нужен только первый столбец каждой строки
+    if (token) {
+      int n = atoi(token);
+      printf("%s\n", n);
+    }
+
+    // If you need all the values in a row
+    // Если нам нужны все значения подряд
+    while (token) {
+      // Just printing each integer here but handle as needed
+      // int n = atoi(token);
+      printf("%s\n", token);
+
+      token = strtok(NULL, ",");
+    }
+  }
+
+  return 0;
+}

code/C/README.md

@@ -1,13 +1,43 @@
 # C
 
-## Other
+## Работа со строками
 
-- [seconds_to_minutes_and_hours.c](seconds_to_minutes_and_hours.c) - Преобразование секунд в минуты и часы
-- [get_ram_usage.c](get_ram_usage.c) - Получение используемой приложением RAM
-## SQLite 3
+- [clear_string.c](Strings/clear_string.c) - Очистка строки `char *`
+- [`strlen()`](Strings/buffer_len.h) - Получить длину строки
+- []() - 
 
-- [CREATE TABLE](sqlite/sqlite3_create.c)
-- [INSERT INTO](sqlite/sqlite3_insert.c)
-- [SELECT](sqlite/sqlite3_select.c)
-- [UPDATE](sqlite/sqlite3_update.c)
-- [DELETE](sqlite/sqlite3_delete.c)
+## Преобразования
+
+- [rgbToHex.c](Transform/rgbToHex.c) - Преобразование RGB строки в HEX строку _(#008040)_
+- [seconds_to_minutes_and_hours.c](Transform/seconds_to_minutes_and_hours.c) - Преобразование секунд в минуты и часы
+
+## Парсеры
+
+- [read_csv.c](Parsing/CSV/read_csv.c) - Парсинг CSV файлов
+
+## Система
+
+- [get_ram_usage.c](System/get_ram_usage.c) - Получение статистики использования RAM
+- [`sys/statvfs.h`](System/disk_usage.c) - Получение статиистики использования диска
+- [`pidof`](System/get-pid-by-process-name.c) - Получение ID процесса по его имени
+
+## 🗄️ SQLite 3
+
+- [CREATE TABLE](SQLite/sqlite3_create.c) — Создание таблицы
+- [INSERT INTO](SQLite/sqlite3_insert.c) — Вставка
+- [SELECT](SQLite/sqlite3_select.c) — Выбор
+- [UPDATE](SQLite/sqlite3_update.c) — Обновление
+- [DELETE](SQLite/sqlite3_delete.c) — Удаление
+
+## Web
+
+- [`webui`](Web/webui) - Пример библиотеки [webui](https://webui.me/)
+- [`ulfius`](Web/ulfius-server) - Пример библиотеки ulfius
+
+## Другое
+
+- [`conio.h`](conio.h/README.md) - Описание и работа функций заголовоного файла `conio.h`.
+- [unixsocket](unixsocket) - Пример работы с сокетами UNIX
+- [AF_INET_sockets](AF_INET_sockets) - Пример работы с сокетами
+- [atomic.c](atomic.c) - Пример `atomic`
+- [thread.c](thread.c) - Пример многопоточности

code/C/SQLite/.gitignore

@@ -0,0 +1 @@
+sqlite3_*

code/C/SQLite/sqlite3_create.c

@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
+  int i;
+  for (i = 0; i < argc; i++) {
+    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+  }
+
+  printf("\n");
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  sqlite3 *db;
+  char *zErrMsg = 0;
+  int rc;
+  char *sql;
+
+  /* Open database */
+  rc = sqlite3_open("test.db", &db);
+
+  if (rc) {
+    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+    return (0);
+  } else {
+    fprintf(stdout, "Opened database successfully\n");
+  }
+
+  /* Create SQL statement */
+  sql = "CREATE TABLE COMPANY("
+        "ID INT PRIMARY KEY     NOT NULL,"
+        "NAME           TEXT    NOT NULL,"
+        "AGE            INT     NOT NULL,"
+        "ADDRESS        CHAR(50),"
+        "SALARY         REAL);";
+
+  /* Execute SQL statement */
+  rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
+
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "SQL error: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  } else {
+    fprintf(stdout, "Table created successfully\n");
+  }
+
+  sqlite3_close(db);
+
+  return 0;
+}

code/C/SQLite/sqlite3_delete.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+  int i;
+  fprintf(stderr, "%s: ", (const char *)data);
+
+  for (i = 0; i < argc; i++) {
+    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+  }
+
+  printf("\n");
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  sqlite3 *db;
+  char *zErrMsg = 0;
+  int rc;
+  char *sql;
+  const char *data = "Callback function called";
+
+  /* Open database */
+  rc = sqlite3_open("test.db", &db);
+
+  if (rc) {
+    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+    return (0);
+  } else {
+    fprintf(stderr, "Opened database successfully\n");
+  }
+
+  /* Create merged SQL statement */
+  sql = "DELETE from COMPANY where ID=2; "
+        "SELECT * from COMPANY";
+
+  /* Execute SQL statement */
+  rc = sqlite3_exec(db, sql, callback, (void *)data, &zErrMsg);
+
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "SQL error: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  } else {
+    fprintf(stdout, "Operation done successfully\n");
+  }
+
+  sqlite3_close(db);
+
+  return 0;
+}

code/C/SQLite/sqlite3_insert.c

@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
+  int i;
+  for (i = 0; i < argc; i++) {
+    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+  }
+
+  printf("\n");
+
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  sqlite3 *db;
+  char *zErrMsg = 0;
+  int rc;
+  char *sql;
+
+  /* Open database */
+  rc = sqlite3_open("test.db", &db);
+
+  if (rc) {
+    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+    return (0);
+  } else {
+    fprintf(stderr, "Opened database successfully\n");
+  }
+
+  /* Create SQL statement */
+  sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "
+        "VALUES (1, 'Paul', 32, 'California', 20000.00 ); "
+        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "
+        "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "
+        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)"
+        "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );"
+        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)"
+        "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00);";
+
+  /* Execute SQL statement */
+  rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
+
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "SQL error: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  } else {
+    fprintf(stdout, "Records created successfully\n");
+  }
+
+  sqlite3_close(db);
+
+  return 0;
+}

code/C/SQLite/sqlite3_select.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+  int i;
+  fprintf(stderr, "%s: ", (const char *)data);
+
+  for (i = 0; i < argc; i++) {
+    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+  }
+
+  printf("\n");
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  sqlite3 *db;
+  char *zErrMsg = 0;
+  int rc;
+  char *sql;
+  const char *data = "Callback function called";
+
+  /* Open database */
+  rc = sqlite3_open("test.db", &db);
+
+  if (rc) {
+    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+    return (0);
+  } else {
+    fprintf(stderr, "Opened database successfully\n");
+  }
+
+  /* Create SQL statement */
+  sql = "SELECT * from COMPANY";
+
+  /* Execute SQL statement */
+  rc = sqlite3_exec(db, sql, callback, (void *)data, &zErrMsg);
+
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "SQL error: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  } else {
+    fprintf(stdout, "Operation done successfully\n");
+  }
+
+  sqlite3_close(db);
+
+  return 0;
+}

code/C/SQLite/sqlite3_update.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <sqlite3.h>
+
+static int callback(void *data, int argc, char **argv, char **azColName) {
+  int i;
+  fprintf(stderr, "%s: ", (const char *)data);
+
+  for (i = 0; i < argc; i++) {
+    printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
+  }
+
+  printf("\n");
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  sqlite3 *db;
+  char *zErrMsg = 0;
+  int rc;
+  char *sql;
+  const char *data = "Callback function called";
+
+  /* Open database */
+  rc = sqlite3_open("test.db", &db);
+
+  if (rc) {
+    fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
+    return (0);
+  } else {
+    fprintf(stderr, "Opened database successfully\n");
+  }
+
+  /* Create merged SQL statement */
+  sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; "
+        "SELECT * from COMPANY";
+
+  /* Execute SQL statement */
+  rc = sqlite3_exec(db, sql, callback, (void *)data, &zErrMsg);
+
+  if (rc != SQLITE_OK) {
+    fprintf(stderr, "SQL error: %s\n", zErrMsg);
+    sqlite3_free(zErrMsg);
+  } else {
+    fprintf(stdout, "Operation done successfully\n");
+  }
+
+  sqlite3_close(db);
+
+  return 0;
+}

code/C/Strings/clear_string.c

@@ -0,0 +1,9 @@
+int main(int argc, char const *argv[]) {
+  char *buffer = malloc(256 + 1);
+
+  buffer[0] = '\0';
+  strcpy(buffer, "");
+  memset(buffer, '\0', sizeof(buffer));
+
+  return 0;
+}

code/C/System/get-pid-by-process-name.c

@@ -0,0 +1,12 @@
+pid_t getPIDbyName(char *ps_name) {
+  FILE *fp;
+  char *cmd = (char *)calloc(1, 200);
+
+  sprintf(cmd, "pidof %s", ps_name);
+
+  fp = popen(cmd, "r");
+  fread(cmd, 1, 200, fp);
+  fclose(fp);
+
+  return atoi(cmd);
+}

code/C/Transform/rgbToHex.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main(int argc, char const *argv[]) {
+  int red = 0;
+  int green = 128;
+  int blue = 64;
+
+  printf("#%.2x%.2x%.2x\n", red, green, blue); // #008040
+
+  return 0;
+}

code/C/atomic.c

@@ -5,26 +5,24 @@
 atomic_int acnt;
 int cnt;
 
-int f(void* thr_data)
-{
-    (void)thr_data;
-    for(int n = 0; n < 1000; ++n) {
-        ++cnt;
-        ++acnt;
-        // for this example, relaxed memory order is sufficient, e.g.
-        // atomic_fetch_add_explicit(&acnt, 1, memory_order_relaxed);
-    }
-    return 0;
+int f(void *thr_data) {
+  (void)thr_data;
+  for (int n = 0; n < 1000; ++n) {
+    ++cnt;
+    ++acnt;
+    // for this example, relaxed memory order is sufficient, e.g.
+    // atomic_fetch_add_explicit(&acnt, 1, memory_order_relaxed);
+  }
+  return 0;
 }
 
-int main(void)
-{
-    thrd_t thr[10];
-    for(int n = 0; n < 10; ++n)
-        thrd_create(&thr[n], f, NULL);
-    for(int n = 0; n < 10; ++n)
-        thrd_join(thr[n], NULL);
+int main(void) {
+  thrd_t thr[10];
+  for (int n = 0; n < 10; ++n)
+    thrd_create(&thr[n], f, NULL);
+  for (int n = 0; n < 10; ++n)
+    thrd_join(thr[n], NULL);
 
-    printf("The atomic counter is %u\n", acnt);
-    printf("The non-atomic counter is %u\n", cnt);
+  printf("The atomic counter is %u\n", acnt);
+  printf("The non-atomic counter is %u\n", cnt);
 }

code/C/clear_string.c

@@ -1,10 +0,0 @@
-int main(int argc, char const *argv[])
-{
-    char *buffer = malloc(256 + 1);
-
-    buffer[0] = '\0';
-    strcpy(buffer, "");
-    memset(buffer, '\0', sizeof(buffer));
-
-    return 0;
-}

code/C/format-code

@@ -1,10 +0,0 @@
-#!/bin/sh
-
-files=(
-    "file.c"
-)
-
-for file in "${files[@]}"
-do
-    clang-format -i --style=LLVM --sort-includes=false $file
-done

code/C/libserialport/.editorconfig

@@ -1,6 +0,0 @@
-[{clear,build,format-code}]
-indent_style = space
-indent_size = 4
-
-[{*.c,*.ino}]
-indent_size = 2

code/C/libserialport/.gitignore

@@ -1,12 +0,0 @@
-# libserialport examples
-port_info.c
-list_ports.c
-send_receive.c
-
-# binaries
-port_info
-list_ports
-send_receive
-
-listen
-abc.txt

code/C/libserialport/Board/.gitignore

@@ -1 +0,0 @@
-3party/

code/C/libserialport/Board/Board.ino

@@ -1,24 +0,0 @@
-/*
-  Author: Alexander Popov
-  License: Unlicense
-*/
-
-#include "3party/AsyncStream.h"
-AsyncStream<50> serial(&Serial, '\n');
-
-void setup() {
-  Serial.begin(9600);
-}
-
-void loop() {
-  if (strcmp(serial.buf, "ping") == 0) {
-    Serial.println("PONG");
-  }
-
-  Serial.println("ooooo");
-  // delay(1000);
-  Serial.println("zzzz");
-  // delay(1000);
-  Serial.println("xxx");
-  // delay(1000);
-}

code/C/libserialport/Board/README.md

@@ -1,3 +0,0 @@
-Download `AsyncStream.h` from
-https://github.com/GyverLibs/AsyncStream
-and drop in to `3party` folder.

code/C/libserialport/README.md

@@ -1,18 +0,0 @@
-Download `libserialport` library.
-
-```sh
-git clone git://sigrok.org/libserialport
-```
-
-For **build** code use `build` script or build files manually.
-
-Example:
-
-```sh
-export C_INCLUDE_PATH=<path/to/libserialport>
-export LIBRARY_PATH=<path/to/libserialport/.libs>
-
-gcc -static -Wall -O3 -o <output_filename> <file.c> -lserialport
-```
-
-Arduino example project store in `Board` folder.

code/C/libserialport/build_gcc

@@ -1,20 +0,0 @@
-#!/bin/sh
-#
-# build - script for build all files.
-#
-# Alexander Popov <iiiypuk@fastmail.fm>
-
-export C_INCLUDE_PATH=$HOME/Git/libserialport
-export LIBRARY_PATH=$HOME/Git/libserialport/.libs
-
-for file in \
-    port_info.c \
-    list_ports.c \
-    send_receive.c \
-    listen.c \
-
-do
-    echo -ne "[  ] Building $file...\r"
-    gcc -static -Wall -O3 -o ${file%.*} $file -lserialport
-    echo [OK
-done

code/C/libserialport/build_tcc

@@ -1,20 +0,0 @@
-#!/bin/sh
-#
-# build - script for build all files.
-#
-# Alexander Popov <iiiypuk@fastmail.fm>
-
-export C_INCLUDE_PATH=$HOME/Git/libserialport
-export LIBRARY_PATH=$HOME/Git/libserialport/.libs
-
-for file in \
-    port_info.c \
-    list_ports.c \
-    send_receive.c \
-    listen.c \
-
-do
-    echo -ne "[  ] Building $file...\r"
-    tcc -Wall -O3 -o ${file%.*} -I$C_INCLUDE_PATH $file $LIBRARY_PATH/libserialport.a
-    echo [OK
-done

code/C/libserialport/clear

@@ -1,17 +0,0 @@
-#!/bin/sh
-#
-# clear - script for delete all builded files.
-#
-# Alexander Popov <iiiypuk@fastmail.fm>
-
-files=(
-    "port_info"
-    "list_ports"
-    "send_receive"
-    "listen"
-)
-
-for file in ${files[@]}
-do
-    rm $file &> /dev/null
-done

code/C/libserialport/format-code

@@ -1,14 +0,0 @@
-#!/bin/sh
-#
-# formt-code - script for beautify code by clang-format.
-#
-# Alexander Popov <iiiypuk@fastmail.fm>
-
-files=(
-    "listen.c"
-)
-
-for file in "${files[@]}"
-do
-    clang-format -i --style=LLVM --sort-includes=false $file
-done

code/C/libserialport/listen.c

@@ -1,133 +0,0 @@
-#include <libserialport.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <signal.h>
-
-/* Helper function for error handling. */
-int check(enum sp_return result);
-void handle_sigint(int sig);
-
-bool INTERRUPT = false;
-
-int main(int argc, char **argv) {
-  struct sp_port *serial_port;
-  char *port_name;
-
-  const int size = 256;
-  char *buffer = malloc(size + 1);
-
-  const unsigned int timeout = 1000;
-  int result;
-
-  /* Get the port name from the command line. */
-  if (argc != 2) {
-    printf("Usage: %s <port>\n\n", argv[0]);
-
-    struct sp_port **port_list;
-    enum sp_return result = sp_list_ports(&port_list);
-
-    /* Getting the available ports. */
-    if (result != SP_OK) {
-      puts("Getting available ports failed!");
-    } else {
-      puts("Available ports:");
-
-      int i;
-      for (i = 0; port_list[i] != NULL; i++) {
-        /* Get the name of the port. */
-        struct sp_port *port = port_list[i];
-        char *port_name = sp_get_port_name(port);
-
-        printf("  * %s\n", port_name);
-      }
-
-      printf("\nAvailable %d ports.\n", i);
-
-      sp_free_port_list(port_list);
-    }
-
-    return -1;
-  } else {
-    port_name = argv[1];
-  }
-
-  printf("Connecting to '%s'...\n", port_name);
-  check(sp_get_port_by_name(port_name, &serial_port));
-  check(sp_open(serial_port, SP_MODE_READ_WRITE));
-
-  check(sp_set_baudrate(serial_port, 9600));
-  check(sp_set_bits(serial_port, 8));
-  check(sp_set_parity(serial_port, SP_PARITY_NONE));
-  check(sp_set_stopbits(serial_port, 1));
-  check(sp_set_flowcontrol(serial_port, SP_FLOWCONTROL_NONE));
-  puts("Connected.");
-
-  signal(SIGINT, handle_sigint);
-
-  FILE *output_file;
-  output_file = fopen("./abc.txt", "w");
-
-  /* Reading lines from serial port. */
-  bool reading = true;
-  while (reading && !INTERRUPT) {
-    int pos = 0;
-
-    /* Character-by-character reading. */
-    while (pos < size) {
-      result = check(sp_blocking_read(serial_port, buffer + pos, 1, timeout));
-
-      if (result == -1) {
-        puts("Error reading from serial port");
-
-        reading = false;
-        break;
-      } else if (result == 0) {
-        puts("No more data");
-        break;
-      } else {
-        if (buffer[pos] == '\n') {
-          buffer[pos] = '\0';
-          break;
-        }
-
-        pos++;
-      }
-    }
-
-    puts(buffer);
-    fputs(buffer, output_file);
-  }
-
-  fclose(output_file);
-  free(buffer);
-
-  return 0;
-}
-
-/* Helper function for error handling. */
-int check(enum sp_return result) {
-  char *error_message;
-
-  switch (result) {
-  case SP_ERR_ARG:
-    puts("Error: Invalid argument.");
-    abort();
-  case SP_ERR_FAIL:
-    error_message = sp_last_error_message();
-    printf("Error: Failed: %s\n", error_message);
-    sp_free_error_message(error_message);
-    abort();
-  case SP_ERR_SUPP:
-    puts("Error: Not supported.");
-    abort();
-  case SP_ERR_MEM:
-    puts("Error: Couldn't allocate memory.");
-    abort();
-  case SP_OK:
-  default:
-    return result;
-  }
-}
-
-void handle_sigint(int sig) { INTERRUPT = true; }

code/C/read csv/read_csv.c

@@ -1,31 +0,0 @@
-#include <stdio.h>  // file handling functions
-#include <stdlib.h> // atoi
-#include <string.h> // strtok
-
-int main() {
-    char buffer[80];
-    FILE *stream = fopen("example.csv", "r");
-
-    while (fgets(buffer, 80, stream)) {
-        char *token = strtok(buffer, ",");
-
-        // If you only need the first column of each row
-        // Если нам нужен только первый столбец каждой строки
-        if (token) {
-            int n = atoi(token);
-            printf("%s\n", n);
-        }
-
-        // If you need all the values in a row
-        // Если нам нужны все значения подряд
-        while (token) {
-            // Just printing each integer here but handle as needed
-            // int n = atoi(token);
-            printf("%s\n", token);
-
-            token = strtok(NULL, ",");
-        }
-    }
-
-    return 0;
-}

code/C/rgbToHex.c

@@ -1,12 +0,0 @@
-#include <stdio.h>
-
-int main(int argc, char const *argv[])
-{
-    int red = 0;
-    int green = 128;
-    int blue = 64;
-
-    printf("#%.2x%.2x%.2x\n", red, green, blue); //#008040
-
-    return 0;
-}

code/C/sqlite/sqlite3_create.c

@@ -1,52 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sqlite3.h>
-
-static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
-    int i;
-    for(i = 0; i<argc; i++) {
-        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
-    }
-
-    printf("\n");
-    return 0;
-}
-
-int main(int argc, char* argv[]) {
-    sqlite3 *db;
-    char *zErrMsg = 0;
-    int rc;
-    char *sql;
-
-    /* Open database */
-    rc = sqlite3_open("test.db", &db);
-
-    if (rc) {
-        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
-        return(0);
-    } else {
-        fprintf(stdout, "Opened database successfully\n");
-    }
-
-    /* Create SQL statement */
-    sql = "CREATE TABLE COMPANY("  \
-    "ID INT PRIMARY KEY     NOT NULL," \
-    "NAME           TEXT    NOT NULL," \
-    "AGE            INT     NOT NULL," \
-    "ADDRESS        CHAR(50)," \
-    "SALARY         REAL);";
-
-    /* Execute SQL statement */
-    rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
-
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "SQL error: %s\n", zErrMsg);
-        sqlite3_free(zErrMsg);
-    } else {
-        fprintf(stdout, "Table created successfully\n");
-    }
-
-    sqlite3_close(db);
-
-    return 0;
-}

code/C/sqlite/sqlite3_delete.c

@@ -1,51 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sqlite3.h>
-
-static int callback(void *data, int argc, char **argv, char **azColName) {
-    int i;
-    fprintf(stderr, "%s: ", (const char*)data);
-
-    for (i = 0; i<argc; i++) {
-        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
-    }
-
-    printf("\n");
-    return 0;
-}
-
-int main(int argc, char* argv[]) {
-    sqlite3 *db;
-    char *zErrMsg = 0;
-    int rc;
-    char *sql;
-    const char* data = "Callback function called";
-
-    /* Open database */
-    rc = sqlite3_open("test.db", &db);
-
-    if (rc) {
-        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
-        return(0);
-    } else {
-        fprintf(stderr, "Opened database successfully\n");
-    }
-
-    /* Create merged SQL statement */
-    sql = "DELETE from COMPANY where ID=2; " \
-        "SELECT * from COMPANY";
-
-    /* Execute SQL statement */
-    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
-
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "SQL error: %s\n", zErrMsg);
-        sqlite3_free(zErrMsg);
-    } else {
-        fprintf(stdout, "Operation done successfully\n");
-    }
-
-    sqlite3_close(db);
-
-    return 0;
-}

code/C/sqlite/sqlite3_insert.c

@@ -1,55 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sqlite3.h>
-
-static int callback(void *NotUsed, int argc, char **argv, char **azColName) {
-    int i;
-    for (i = 0; i<argc; i++) {
-        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
-    }
-
-    printf("\n");
-
-    return 0;
-}
-
-int main(int argc, char* argv[]) {
-    sqlite3 *db;
-    char *zErrMsg = 0;
-    int rc;
-    char *sql;
-
-    /* Open database */
-    rc = sqlite3_open("test.db", &db);
-
-    if (rc) {
-        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
-        return(0);
-    } else {
-        fprintf(stderr, "Opened database successfully\n");
-    }
-
-    /* Create SQL statement */
-    sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
-        "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " \
-        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) "  \
-        "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); "     \
-        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
-        "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" \
-        "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" \
-        "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00);";
-
-    /* Execute SQL statement */
-    rc = sqlite3_exec(db, sql, callback, 0, &zErrMsg);
-
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "SQL error: %s\n", zErrMsg);
-        sqlite3_free(zErrMsg);
-    } else {
-        fprintf(stdout, "Records created successfully\n");
-    }
-
-    sqlite3_close(db);
-
-    return 0;
-}

code/C/sqlite/sqlite3_select.c

@@ -1,50 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sqlite3.h>
-
-static int callback(void *data, int argc, char **argv, char **azColName) {
-    int i;
-    fprintf(stderr, "%s: ", (const char*)data);
-
-    for (i = 0; i<argc; i++) {
-        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
-    }
-
-    printf("\n");
-    return 0;
-}
-
-int main(int argc, char* argv[]) {
-    sqlite3 *db;
-    char *zErrMsg = 0;
-    int rc;
-    char *sql;
-    const char* data = "Callback function called";
-
-    /* Open database */
-    rc = sqlite3_open("test.db", &db);
-
-    if (rc) {
-        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
-        return(0);
-    } else {
-        fprintf(stderr, "Opened database successfully\n");
-    }
-
-    /* Create SQL statement */
-    sql = "SELECT * from COMPANY";
-
-    /* Execute SQL statement */
-    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
-
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "SQL error: %s\n", zErrMsg);
-        sqlite3_free(zErrMsg);
-    } else {
-        fprintf(stdout, "Operation done successfully\n");
-    }
-
-    sqlite3_close(db);
-
-    return 0;
-}

code/C/sqlite/sqlite3_update.c

@@ -1,51 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sqlite3.h>
-
-static int callback(void *data, int argc, char **argv, char **azColName) {
-    int i;
-    fprintf(stderr, "%s: ", (const char*)data);
-
-    for(i = 0; i<argc; i++) {
-        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
-    }
-
-    printf("\n");
-    return 0;
-}
-
-int main(int argc, char* argv[]) {
-    sqlite3 *db;
-    char *zErrMsg = 0;
-    int rc;
-    char *sql;
-    const char* data = "Callback function called";
-
-    /* Open database */
-    rc = sqlite3_open("test.db", &db);
-
-    if (rc) {
-        fprintf(stderr, "Can't open database: %s\n", sqlite3_errmsg(db));
-        return(0);
-    } else {
-        fprintf(stderr, "Opened database successfully\n");
-    }
-
-    /* Create merged SQL statement */
-    sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; " \
-        "SELECT * from COMPANY";
-
-    /* Execute SQL statement */
-    rc = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
-
-    if (rc != SQLITE_OK) {
-        fprintf(stderr, "SQL error: %s\n", zErrMsg);
-        sqlite3_free(zErrMsg);
-    } else {
-        fprintf(stdout, "Operation done successfully\n");
-    }
-
-    sqlite3_close(db);
-
-    return 0;
-}

code/C/thread.c

@@ -8,24 +8,24 @@
 int g = 0;
 
 void *my_thread(void *vargp) {
-    int *id = (int *)vargp;
+  int *id = (int *)vargp;
 
-    static int s = 0;
+  static int s = 0;
 
-    ++s;
-    ++g;
+  ++s;
+  ++g;
 
-    printf("Thread ID: %d, Static: %d, Global: %d\n", *id, ++s, ++g);
+  printf("Thread ID: %d, Static: %d, Global: %d\n", *id, ++s, ++g);
 }
 
 int main() {
-    pthread_t tid;
+  pthread_t tid;
 
-    int i;
-    for (i = 0; i < 3; i++)
+  int i;
+  for (i = 0; i < 3; i++)
     pthread_create(&tid, NULL, my_thread, (void *)&tid);
 
-    pthread_exit(NULL);
+  pthread_exit(NULL);
 
-    return 0;
+  return 0;
 }

code/C/unixsocket/client.c

@@ -12,68 +12,67 @@
 #include <unistd.h>
 
 int main(int argc, char *argv[]) {
-    struct sockaddr_un addr;
-    int i;
-    int ret;
-    int data_socket;
-    char buffer[BUFFER_SIZE];
+  struct sockaddr_un addr;
+  int i;
+  int ret;
+  int data_socket;
+  char buffer[BUFFER_SIZE];
 
-    /* Create local socket. */
-    data_socket = socket(AF_UNIX, SOCK_STREAM, 0);
-    if (data_socket == -1) {
-        perror("socket");
-        exit(EXIT_FAILURE);
-    }
+  /* Create local socket. */
+  data_socket = socket(AF_UNIX, SOCK_STREAM, 0);
+  if (data_socket == -1) {
+    perror("socket");
+    exit(EXIT_FAILURE);
+  }
 
-    /*
-     * For portability clear the whole structure, since some
-     * implementations have additional (nonstandard) fields in
-     * the structure.
-     */
-    memset(&addr, 0, sizeof(struct sockaddr_un));
+  /*
+   * For portability clear the whole structure, since some
+   * implementations have additional (nonstandard) fields in
+   * the structure.
+   */
+  memset(&addr, 0, sizeof(struct sockaddr_un));
 
-    /* Connect socket to socket address */
-    addr.sun_family = AF_UNIX;
-    strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);
+  /* Connect socket to socket address */
+  addr.sun_family = AF_UNIX;
+  strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);
 
-    ret = connect (data_socket, (const struct sockaddr *) &addr,
-                   sizeof(struct sockaddr_un));
+  ret = connect(data_socket, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un));
+  if (ret == -1) {
+    fprintf(stderr, "The server is down.\n");
+    exit(EXIT_FAILURE);
+  }
+
+  /* Send arguments. */
+  for (i = 1; i < argc; ++i) {
+    ret = write(data_socket, argv[i], strlen(argv[i]) + 1);
     if (ret == -1) {
-        fprintf(stderr, "The server is down.\n");
-        exit(EXIT_FAILURE);
+      perror("write");
+      break;
     }
+  }
 
-    /* Send arguments. */
-    for (i = 1; i < argc; ++i) {
-        ret = write(data_socket, argv[i], strlen(argv[i]) + 1);
-        if (ret == -1) {
-            perror("write");
-            break;
-        }
-    }
+  /* Request result. */
+  strcpy(buffer, "END");
+  ret = write(data_socket, buffer, strlen(buffer) + 1);
+  if (ret == -1) {
+    perror("write");
+    exit(EXIT_FAILURE);
+  }
 
-    /* Request result. */
-    strcpy (buffer, "END");
-    ret = write(data_socket, buffer, strlen(buffer) + 1);
-    if (ret == -1) {
-        perror("write");
-        exit(EXIT_FAILURE);
-    }
+  /* Receive result. */
+  ret = read(data_socket, buffer, BUFFER_SIZE);
+  if (ret == -1) {
+    perror("read");
+    exit(EXIT_FAILURE);
+  }
 
-    /* Receive result. */
-    ret = read(data_socket, buffer, BUFFER_SIZE);
-    if (ret == -1) {
-        perror("read");
-        exit(EXIT_FAILURE);
-    }
+  /* Ensure buffer is 0-terminated. */
+  buffer[BUFFER_SIZE - 1] = 0;
 
-    /* Ensure buffer is 0-terminated. */
-    buffer[BUFFER_SIZE - 1] = 0;
+  printf("Result = %s\n", buffer);
 
-    printf("Result = %s\n", buffer);
+  /* Close socket. */
+  close(data_socket);
 
-    /* Close socket. */
-    close(data_socket);
-
-    exit(EXIT_SUCCESS);
+  exit(EXIT_SUCCESS);
 }

code/C/unixsocket/server.c

@@ -11,113 +11,112 @@
 #include <unistd.h>
 
 int main(int argc, char *argv[]) {
-    struct sockaddr_un addr;
-    int down_flag = 0;
-    int ret;
-    int listen_socket;
-    int data_socket;
-    int result;
-    char buffer[BUFFER_SIZE];
+  struct sockaddr_un addr;
+  int down_flag = 0;
+  int ret;
+  int listen_socket;
+  int data_socket;
+  int result;
+  char buffer[BUFFER_SIZE];
 
-    /*
-     * In case the program exited inadvertently on the last run,
-     * remove the socket.
-     */
-    unlink(SOCKET_NAME);
+  /*
+   * In case the program exited inadvertently on the last run,
+   * remove the socket.
+   */
+  unlink(SOCKET_NAME);
 
-    /* Create local socket. */
-    listen_socket = socket(AF_UNIX, SOCK_STREAM, 0);
-    if (listen_socket == -1) {
-        perror("socket");
-        exit(EXIT_FAILURE);
+  /* Create local socket. */
+  listen_socket = socket(AF_UNIX, SOCK_STREAM, 0);
+  if (listen_socket == -1) {
+    perror("socket");
+    exit(EXIT_FAILURE);
+  }
+
+  /*
+   * For portability clear the whole structure, since some
+   * implementations have additional (nonstandard) fields in
+   * the structure.
+   */
+  memset(&addr, 0, sizeof(struct sockaddr_un));
+
+  /* Bind socket to socket name. */
+  addr.sun_family = AF_UNIX;
+  strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);
+
+  ret = bind(listen_socket, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un));
+  if (ret == -1) {
+    perror("bind");
+    exit(EXIT_FAILURE);
+  }
+
+  /*
+   * Prepare for accepting connections. The backlog size is set
+   * to 20. So while one request is being processed other requests
+   * can be waiting.
+   */
+  ret = listen(listen_socket, 20);
+  if (ret == -1) {
+    perror("listen");
+    exit(EXIT_FAILURE);
+  }
+
+  /* This is the main loop for handling connections. */
+  for (;;) {
+    /* Wait for incoming connection. */
+    data_socket = accept(listen_socket, NULL, NULL);
+    if (data_socket == -1) {
+      perror("accept");
+      exit(EXIT_FAILURE);
     }
 
-    /*
-     * For portability clear the whole structure, since some
-     * implementations have additional (nonstandard) fields in
-     * the structure.
-     */
-    memset(&addr, 0, sizeof(struct sockaddr_un));
-
-    /* Bind socket to socket name. */
-    addr.sun_family = AF_UNIX;
-    strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);
-
-    ret = bind(listen_socket, (const struct sockaddr *) &addr,
-               sizeof(struct sockaddr_un));
-    if (ret == -1) {
-        perror("bind");
-        exit(EXIT_FAILURE);
-    }
-
-    /*
-     * Prepare for accepting connections. The backlog size is set
-     * to 20. So while one request is being processed other requests
-     * can be waiting.
-     */
-    ret = listen(listen_socket, 20);
-    if (ret == -1) {
-        perror("listen");
-        exit(EXIT_FAILURE);
-    }
-
-    /* This is the main loop for handling connections. */
+    result = 0;
     for (;;) {
-        /* Wait for incoming connection. */
-        data_socket = accept(listen_socket, NULL, NULL);
-        if (data_socket == -1) {
-            perror("accept");
-            exit(EXIT_FAILURE);
-        }
+      /* Wait for next data packet. */
+      ret = read(data_socket, buffer, BUFFER_SIZE);
+      if (ret == -1) {
+        perror("read");
+        exit(EXIT_FAILURE);
+      }
 
-        result = 0;
-        for(;;) {
-            /* Wait for next data packet. */
-            ret = read(data_socket, buffer, BUFFER_SIZE);
-            if (ret == -1) {
-                perror("read");
-                exit(EXIT_FAILURE);
-            }
+      /* Ensure buffer is 0-terminated. */
+      buffer[BUFFER_SIZE - 1] = 0;
 
-            /* Ensure buffer is 0-terminated. */
-            buffer[BUFFER_SIZE - 1] = 0;
+      /* Handle commands. */
+      if (!strncmp(buffer, "DOWN", BUFFER_SIZE)) {
+        down_flag = 1;
+        break;
+      }
 
-            /* Handle commands. */
-            if (!strncmp(buffer, "DOWN", BUFFER_SIZE)) {
-                down_flag = 1;
-                break;
-            }
+      if (!strncmp(buffer, "END", BUFFER_SIZE)) {
+        break;
+      }
 
-            if (!strncmp(buffer, "END", BUFFER_SIZE)) {
-                break;
-            }
-
-            /* Add received summand. */
-            result += atoi(buffer);
-        }
-
-        /* Send result. */
-        sprintf(buffer, "%d", result);
-        ret = write(data_socket, buffer, BUFFER_SIZE);
-
-        if (ret == -1) {
-            perror("write");
-            exit(EXIT_FAILURE);
-        }
-
-        /* Close socket. */
-        close(data_socket);
-
-        /* Quit on DOWN command. */
-        if (down_flag) {
-            break;
-        }
+      /* Add received summand. */
+      result += atoi(buffer);
     }
 
-    close(listen_socket);
+    /* Send result. */
+    sprintf(buffer, "%d", result);
+    ret = write(data_socket, buffer, BUFFER_SIZE);
 
-    /* Unlink the socket. */
-    unlink(SOCKET_NAME);
+    if (ret == -1) {
+      perror("write");
+      exit(EXIT_FAILURE);
+    }
 
-    exit(EXIT_SUCCESS);
+    /* Close socket. */
+    close(data_socket);
+
+    /* Quit on DOWN command. */
+    if (down_flag) {
+      break;
+    }
+  }
+
+  close(listen_socket);
+
+  /* Unlink the socket. */
+  unlink(SOCKET_NAME);
+
+  exit(EXIT_SUCCESS);
 }