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Showing content from https://github.com/Isty001/dotenv-c below:

Isty001/dotenv-c: .env file parser written in C

This small package adds support for loading .env files. Just call the env_load function with a valid path, that contains a file named .env, or the path of the env file itself. If can't be loaded, it'll return -1, 0 otherwise. If the second parameter is set to true, already existing environment variable will be replaced with the new value.

In the file, comments can be added by starting the line with #. It's also possible to nest the variables, but in that case, the used variables need be already defined.

Quotes won't be removed from the strings.

# Build
(mkdir -p build && cd build && \
cmake .. && cmake --build .)

# Optional install
sudo make install

mkdir -p build && cd build && \
cmake -DCMAKE_BUILD_TYPE=DEBUG -DDOTENV_TEST=ON .. && cmake --build . && \
cd .. && ./build/dotenv-test) 

Install via clib: clib install Isty001/dotenv-c, or just git clone into your project.

Or if you don't want to include in your project, you can git clone then install by executing make install then link it with -ldotenv.

# DB connection
DB_HOST=localhost
DB_NAME=test_db
DSN=mysql:host=${DB_HOST};dbname=${DB_NAME}

#include <dotenv.h>

int main(void)
{
    env_load(".", false);

    char *connection = getenv("DSN");
}

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