David edwards jr wrote:
thank you leif. works well and with the protection not in sprintf. I
also found it in the pdf file that I had. I simply did not go down
to the functions section
Note that while gmp_snprintf() protects your buffer from overflowing, it
doesn't protect you from truncated numbers.
If the buffer was too small, [gmp_]snprintf() returns a number >= the
size you passed to it.
You can use mpz_sizeinbase(x, 10) to check in advance whether your
number x will fit into the string buffer (in decimal notation, i.e.,
base 10). Your buffer should be at least two bytes larger than that
(assuming you use just "%Zd"); one byte for a possible '-' sign, one for
the trailing '\0'.
See also mpz_get_str(), which does the necessary allocation for you if
you pass NULL instead of the address of a buffer; it's up to you to free
the allocated memory afterwards when necessary or appropriate though.
-leif
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