expected warning?

This is a discussion on expected warning? within the C Programming forums, part of the General Programming Boards category; My current project is a basic syntax to c/c++ translator. In legacy code that I inherited this line LINE INPUT ...

  1. #1
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    Mar 2013
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    expected warning?

    My current project is a basic syntax to c/c++ translator.
    In legacy code that I inherited this line


    LINE INPUT hFile,a$


    Is translated to:
    Code:
    fgets(a, 1048576, hFile);

    with a$ having the default size of a $:
    Code:
    char a[2048];
    I am curious why no (windows) compiler(gcc,PellesC) emits a warning when compiling?


    Is it a "JUST DON'T DO THAT !!" ?




    James

  2. #2
    - - - - - - - - oogabooga's Avatar
    Join Date
    Jan 2008
    Posts
    2,808
    Code:
    #include <stdio.h>
    
    int main() {
        char a[2048];
        fgets(a, 1048576, stdin);
        puts(a);
        return 0;
    }
    No warning for that, even with -Wall -Wextra. In general, it would be hard to provide one considering that a could be dynamically allocated.

    If a's a char array, it may be best to use:
    Code:
        fgets(a, sizeof(a), stdin);
    although if a's a pointer, that won't work.
    In that case, you have to keep track of the size.

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