Overlapped Buffers for string functions
Tue May 12 10:22:00 GMT 2009
I have two questions.
In my attempt to become one of the Geeks, I was trying to fix a kernel
bug - http://bugzilla.kernel.org/show_bug.cgi?id=12966
I came across the sprintf function, and I was told that the source and
destination buffers should not overlap i.e.,
sprintf(buffer, "%s appended", buffer);
is a wrong usage and how it should be used is, like:
sprintf(buffer + strlen(buffer), " appended");
(1) Is this correct ?
I could not find this information from the man pages.
I belive that appending to a string is a common usecase and a new api
could be very handy in a lot of places.
saprintf = string append printf
char * buffer saprintf (char *buffer, const char * format, ...);
This function internally could do just,
sprintf (buffer + strlen (buffer), format, ...);
+ plus other error checks
(2) Is it okay to implement this new api - saprintf ? I am willing to
give a patch, if the idea is approved.
Are there any other better methods that I am overlooking ?
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