Mercurial > libbuf
view buf-vprintf.c @ 19:cf6a2b8642c1
misc: added tag 0.2.0 for changeset 7f5b3f035bef
author | David Demelier <markand@malikania.fr> |
---|---|
date | Wed, 16 Dec 2020 16:20:43 +0100 |
parents | b1991ee4451d |
children | 939fe74cd80a |
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/* * buf-vprintf.c -- simple string buffer for C * * Copyright (c) 2019-2020 David Demelier <markand@malikania.fr> * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <assert.h> #include <stdio.h> #include "buf.h" #include "buf-int.h" bool buf_vprintf(struct buf *b, const char *fmt, va_list args) { assert(b); assert(fmt); va_list ap; int amount; /* Determine length. */ va_copy(ap, args); amount = vsnprintf(NULL, 0, fmt, ap); va_end(ap); if (amount < 0) return false; /* Do actual copy. */ if (!_buf_grow(b, amount)) return false; va_copy(ap, args); amount = vsprintf(&b->data[b->length], fmt, ap); va_end(ap); if (amount < 0) return false; b->length += amount; return true; }