Thread: safe gets (allocating)?

  1. #1
    Algorithm engineer
    Join Date
    Jun 2006

    safe gets (allocating)?


    I'm wondering whether there is a safe gets which allocates new memory for the string, like scanf("%as", &s), with the difference that it scans the whole line instead of stopping at a blank space. Or can you modify scanf("%as", &s) to stop reading only at new line characters?
    Come on, you can do it! b( ~_')

  2. #2
    Kernel hacker
    Join Date
    Jul 2007
    Farncombe, Surrey, England
    fgets() is the safe option of gets, but it's still not allocating memory - you have to give it a "large enough" buffer - it will stop at the end of input, and you can detect if it read the entire line or not.

    In linux there is "gnu readline" which returns a pointer to a string.

    You can of course write a readline compatible function for Windows (with the same or a different name), using for example fgets() in (with a large temporary buffer and allocating a second buffer and copy into the allocated memory) or using fgetc() and allocating the buffer as you need.

    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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