/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * Copyright (c) 2017, 2018 * Cyril S. E. Schubert. All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * 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 of the University 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 REGENTS 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 REGENTS 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. */ #include __FBSDID("$FreeBSD$"); #include "namespace.h" #include #include #include #include #include "un-namespace.h" #include "libc_private.h" #include "local.h" static inline char * _gets_s(char *buf, rsize_t n) { int c; char *s; ORIENT(stdin, -1); for (s = buf, n--; (c = __sgetc(stdin)) != '\n' && n > 0 ; n--) { if (c == EOF) { if (s == buf) { return (NULL); } else break; } else *s++ = c; } /* * If end of buffer reached, discard until \n or eof. * Then throw an error. */ if (n == 0) { /* discard */ while ((c = __sgetc(stdin)) != '\n' && c != EOF); /* throw the error after lock released prior to exit */ __throw_constraint_handler_s("gets_s : end of buffer", E2BIG); return (NULL); } *s = 0; return (buf); } /* ISO/IEC 9899:2011 K.3.7.4.1 */ char * gets_s(char *buf, rsize_t n) { char *ret; if (buf == NULL) { __throw_constraint_handler_s("gets_s : str is NULL", EINVAL); return(NULL); } else if (n > RSIZE_MAX) { __throw_constraint_handler_s("gets_s : n > RSIZE_MAX", EINVAL); return(NULL); } else if (n == 0) { __throw_constraint_handler_s("gets_s : n == 0", EINVAL); return(NULL); } FLOCKFILE_CANCELSAFE(stdin); ret = _gets_s(buf, n); FUNLOCKFILE_CANCELSAFE(); return (ret); }