Inserting

are there any open/write functions for C , which do not overwrite chars in a file , but insert them ?

or do i have to write a shitty loop that just reads , stores and writes a char ?

also discuss file and string handling libraries because most that i have seen suck .

>>9
Unfortunately, you can't patch large files fast. For this reason, many file formats that are designed to be both large and edited often tend to be designed like filesystems.

BTW : there is no function in libc which can insert into buffers ? i assume i would have to implement a read store write loop for a buffer too ? after allocating memory ofcourse .
Not that I know of, but that's easily fixed:

void meminsert(char *buffer, int index, char *insertData, char *insertDataSize)
{
    // assumes buffer has room for the extra insertDataSize bytes
    memmove(buffer + index + insertDataSize, buffer + index, insertDataSize);
    memcpy(buffer + index, insertData, insertDataSize);
}
Note that this is still rather slow, and that calling it once with much data to insert is way faster than calling it often with small chunks to insert.