1 /* 2 * Copyright (c) 1985 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[] = "@(#)strtok.c 5.4 (Berkeley) 06/27/88"; 20 #endif /* LIBC_SCCS and not lint */ 21 22 char * 23 strtok(s, sep) 24 register char *s, *sep; 25 { 26 register char *p; 27 register c; 28 static char *lasts; 29 30 if (s == 0) 31 s = lasts; 32 if (s == 0) 33 return (0); 34 35 while (c = *s) { 36 if (!index(sep, c)) 37 break; 38 s++; 39 } 40 41 if (c == '\0') { 42 lasts = 0; 43 return (0); 44 } 45 46 for (p = s; c = *++p; ) 47 if (index(sep, c)) 48 break; 49 50 if (c == '\0') 51 lasts = 0; 52 else { 53 *p++ = '\0'; 54 lasts = p; 55 } 56 return (s); 57 } 58