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Generalise strbuf_catf() into put_fmt().

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marshal.h now provides a macro put_fmt() which allows you to write
arbitrary printf-formatted data to an arbitrary BinarySink.

We already had this facility for strbufs in particular, in the form of
strbuf_catf(). That was able to take advantage of knowing the inner
structure of a strbuf to minimise memory allocation (it would snprintf
directly into the strbuf's existing buffer if possible). For a general
black-box BinarySink we can't do that, so instead we dupvprintf into a
temporary buffer.

For consistency, I've removed strbuf_catf, and converted all uses of
it into the new put_fmt - and I've also added an extra vtable method
in the BinarySink API, so that put_fmt can still use strbuf_catf's
more efficient memory management when talking to a strbuf, and fall
back to the simpler strategy when that's not available.
This commit is contained in:
Simon Tatham
2021-11-19 10:23:32 +00:00
parent efee4e0eae
commit be8d3974ff
24 changed files with 217 additions and 193 deletions
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4
crypto/ecc-ssh.c
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@ -684,11 +684,11 @@ static char *ecc_cache_str_shared(
strbuf *sb = strbuf_new();
if (curve_name)
strbuf_catf(sb, "%s,", curve_name);
put_fmt(sb, "%s,", curve_name);
char *hx = mp_get_hex(x);
char *hy = mp_get_hex(y);
strbuf_catf(sb, "0x%s,0x%s", hx, hy);
put_fmt(sb, "0x%s,0x%s", hx, hy);
sfree(hx);
sfree(hy);