Best practices

I am trying to write user-entered string data into a file using C.

I am taking input from the user via standard input and then writing that string into a file. I am not using stdio functions like fopen() / fprintf()—instead, I am using Linux system calls such as open() and write().

What I want to do

  • Take a string input from the user

  • Write that string into a file

  • Handle the case where the file does not exist (create it)

  • Ensure the correct number of bytes are written

    code

    char Buffer[1024];

fd = open(name, O_WRONLY | O_APPEND);
iRet = write(fd, Buffer, sizeof(Buffer));
printf("%d Bytes gets successfully written in file\n", iRet);

Problem

The file gets written, but:

  • Extra garbage characters appear in the file, or
  • More bytes are written than expected
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