40c591eac8
sprintf_alloc() -> spdk_sprintf_alloc() Change-Id: I24970baa37615633572d132abe3e57d0889f1a48 Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright (c) Intel Corporation.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "spdk/string.h"
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char *
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spdk_sprintf_alloc(const char *format, ...)
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{
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va_list args;
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char *buf;
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size_t bufsize;
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int rc;
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/* Try with a small buffer first. */
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bufsize = 32;
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/* Limit maximum buffer size to something reasonable so we don't loop forever. */
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while (bufsize <= 1024 * 1024) {
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buf = malloc(bufsize);
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if (buf == NULL) {
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return NULL;
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}
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va_start(args, format);
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rc = vsnprintf(buf, bufsize, format, args);
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va_end(args);
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/*
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* If vsnprintf() returned a count within our current buffer size, we are done.
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* The count does not include the \0 terminator, so rc == bufsize is not OK.
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*/
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if (rc >= 0 && (size_t)rc < bufsize) {
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return buf;
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}
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/*
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* vsnprintf() should return the required space, but some libc versions do not
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* implement this correctly, so just double the buffer size and try again.
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*
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* We don't need the data in buf, so rather than realloc(), use free() and malloc()
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* again to avoid a copy.
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*/
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free(buf);
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bufsize *= 2;
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}
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return NULL;
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}
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