1 /* 2 * Copyright (c) 1988 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18 #if defined(LIBC_SCCS) && !defined(lint) 19 static char sccsid[] = "@(#)strsep.c 5.1 (Berkeley) 09/19/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 #include <stdio.h> 23 24 char * 25 strsep(s, delim) 26 register char *s, *delim; 27 { 28 register char *spanp; 29 register int c, sc; 30 static char *last; 31 char *tok; 32 33 if (s == NULL && (s = last) == NULL) 34 return(NULL); 35 36 /* 37 * Scan token (scan for delimiters: s += strcspn(s, delim), sort of). 38 * Note that delim must have one NUL; we stop if we see that, too. 39 */ 40 for (tok = s;; ++s) { 41 c = *s; 42 spanp = delim; 43 do { 44 if ((sc = *spanp++) == c) { 45 if (c == 0) { 46 last = NULL; 47 return(tok == s ? NULL : tok); 48 } 49 *s++ = '\0'; 50 last = s; 51 return(tok); 52 } 53 } while (sc); 54 } 55 /* NOTREACHED */ 56 } 57