While browsing a draft copy of the C99 standard I thought
a stripped down version of snprintf would be useful in
the kernel. I can think of some proc_fs handling that would
be cleaner and safer using this call.
"man snprintf" (rh 6.2) indicates that glibc 2.1 has a C99
conforming implementation of this function for the user space.
Any comments on the "restrict"?
---------------------------------------------------------------
The snprintf function
Synopsis
[#1]
#include <stdio.h>
int snprintf(char * restrict s, size_t n,
const char * restrict format, ...);
Description
[#2] The snprintf function is equivalent to fprintf, except |
that the output is written into an array (specified by |
argument s) rather than to a stream. If n is zero, nothing
is written, and s may be a null pointer. Otherwise, output
characters beyond the n-1st are discarded rather than being
written to the array, and a null character is written at the
end of the characters actually written into the array. If
copying takes place between objects that overlap, the
behavior is undefined.
Returns
[#3] The snprintf function returns the number of characters
that would have been written had n been sufficiently large,
not counting the terminating null character, or a negative |
value if an encoding error occurred. Thus, the null-
terminated output has been completely written if and only if
the returned value is nonnegative and less than n.
Doug Gilbert
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