Tukukkk

I would like some feedback on a CMakeLists.txt file I created for compiling my project. I have pasted the CMakeLists as well as my source code below. One thing I would specifically appreciate feedback on the sanitization options I have enabled. Are there more I should enable, and/or should I should reduce? I know -fsanitize=address, -fsanitize=thread, and -fsanitize=memory groups can't be used with others (according to the clang documentation). Would one of the other groups be better preferred to use on a first-pass rather than the one I chose (address)?

Also - the blob feature I am using, I have based on a StackOverflow answer I read - I understand that this doesn't detect new C source files and I'm fine with that, but besides that subtle detail is this an okay practice to follow?

CMakeLists.txt

cmake_minimum_required(VERSION 3.13)

project(FirstProject C)



find_package(Curses REQUIRED)

include_directories(${CURSES_INCLUDE_DIR})



set(CMAKE_C_COMPILER clang)

set(CMAKE_C_STANDARD 99)

set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Weverything -fsanitize=undefined,integer,implicit-conversion,nullability,address,leak,cfi -flto -fvisibility=default")



FILE(GLOB Sources *.c)

add_executable(${CMAKE_PROJECT_NAME} ${Sources})

target_link_libraries(${CMAKE_PROJECT_NAME} ${CURSES_LIBRARIES})

main.c

#include <ctype.h>

#include <errno.h>

#include <inttypes.h>

#include <limits.h>

#include <ncurses.h>

#include <stdint.h>

#include <stdlib.h>

#include <string.h>



// Generous estimate of the maximum number of digits

// https://stackoverflow.com/a/10536254

#define ULL_DIGITS (3 * sizeof(unsigned long long))

#define ERR_MSG_MAX_LENGTH 32

#define NUL ''

#define NUL_SIZE 1



int ask_ull(unsigned long long *result, const char *prompt);



/**

 * Prints a prompt then reads an unsigned long long, using ncurses.

 * Returns 0 on success.  Returns errno on failure, which is set to

 * ERANGE, EDOM, or EIO.

 */

int ask_ull(unsigned long long *result, const char *prompt) {

    char buf[ULL_DIGITS + NUL_SIZE];

    char *endptr;

    printw("%s", prompt);

    getnstr(buf, ULL_DIGITS);

    *result = strtoull(buf, &endptr, 10);

    if (errno == ERANGE) {

        // Overflow or underflow

        return errno;

    }

    if (endptr == buf || strchr(buf, '-')) {

        // Unsuccessful conversion

        errno = EDOM;

        return errno;

    }

    while (isspace(*endptr)) endptr++;

    if (*endptr) {

        // Trailing junk

        errno = EIO;

        return errno;

    }

    errno = 0;

    return errno;

}



int main(void) {

    unsigned long long height, width, length;

    height = width = length = 0;



    char errmsg[ERR_MSG_MAX_LENGTH];

    errmsg[0] = NUL;



    initscr();

    printw("--- Volume Calculator --n");

    if (!ask_ull(&length, "Enter length: ")) {

        sscanf(errmsg, "%s", "Unable to scan length");

    }

    if (!ask_ull(&width, "Enter width: ")) {

        sscanf(errmsg, "%s", "Unable to scan width");

    }

    if (!ask_ull(&height, "Enter height: ")) {

        sscanf(errmsg, "%s", "Unable to scan height");

    }



    if (errmsg[0] != NUL) {

        refresh();

        endwin();

        perror(errmsg);

        return errno;

    }



    unsigned long long volume = length * width * height;

    printw("Volume: %llu", volume);

    refresh();

    getch();

    endwin();

}