/* $NetBSD: stresep.c,v 1.4 2017/08/23 10:27:41 christos Exp $ */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * 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 <sys/cdefs.h> #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 6/4/93"; #else __RCSID("$NetBSD: stresep.c,v 1.4 2017/08/23 10:27:41 christos Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include <assert.h> #include <string.h> #ifdef __weak_alias __weak_alias(stresep,_stresep) #endif /* * Get next token from string *stringp, where tokens are possibly-empty * strings separated by characters from delim. If esc is not NUL, then * the characters followed by esc are ignored and are not taken into account * when splitting the string. * * Writes NULs into the string at *stringp to end tokens. * delim need not remain constant from call to call. * On return, *stringp points past the last NUL written (if there might * be further tokens), or is NULL (if there are definitely no more tokens). * * If *stringp is NULL, stresep returns NULL. */ char * stresep(char **stringp, const char *delim, int esc) { char *s; const char *spanp; int c, sc; size_t l; char *tok; _DIAGASSERT(stringp != NULL); _DIAGASSERT(delim != NULL); if ((s = *stringp) == NULL) return NULL; l = strlen(s) + 1; for (tok = s;;) { c = *s++; l--; while (esc != '\0' && c == esc) { memmove(s - 1, s, l); c = *s++; l--; } spanp = delim; do { if ((sc = *spanp++) == c) { if (c == '\0') s = NULL; else s[-1] = '\0'; *stringp = s; return tok; } } while (sc != '\0'); } } |