/**************************************************************************** * libs/libc/stdio/lib_tmpnam.c * * Copyright (C) 2014 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: tmpnam * * Description: * The tmpnam() function generates a string that is a valid filename and * that is not the same as the name of an existing file. The function is * potentially capable of generating TMP_MAX different strings, but any or * all of them may already be in use by existing files and thus not be * suitable return values. * * The tmpnam() function generates a different string each time it is * called from the same process, up to {TMP_MAX} times. If it is called * more than {TMP_MAX} times, the behavior is implementation-defined. * * Returned Value: * Upon successful completion, tmpnam() returns a pointer to a string. I * no suitable string can be generated, the tmpnam() function will * return a null pointer. * * If the argument s is a null pointer, tmpnam() will leave its result * in an internal static object and return a pointer to that object. * Subsequent calls to tmpnam() may modify the same object. If the * argument s is not a null pointer, it is presumed to point to an * array of at least L_tmpnam chars; tmpnam() will write its result in * that array and will return the argument as its value. * ****************************************************************************/ FAR char *tmpnam(FAR char *s) { static char path[L_tmpnam]; int ret; if (s == NULL) { s = path; } (void)snprintf(s, L_tmpnam, "%s/XXXXXX.tmp", P_tmpdir); ret = mktemp(s); return (ret == OK) ? s : NULL; }