1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 */ 7 8 #include <sys/cdefs.h> 9 #include <string.h> 10 #include <stdio.h> 11 12 #if defined(LIBC_SCCS) && !defined(lint) 13 static char sccsid[] = "@(#)strsep.c 8.1 (Berkeley) 06/04/93"; 14 #endif /* LIBC_SCCS and not lint */ 15 16 /* 17 * Get next token from string *stringp, where tokens are possibly-empty 18 * strings separated by characters from delim. 19 * 20 * Writes NULs into the string at *stringp to end tokens. 21 * delim need not remain constant from call to call. 22 * On return, *stringp points past the last NUL written (if there might 23 * be further tokens), or is NULL (if there are definitely no more tokens). 24 * 25 * If *stringp is NULL, strsep returns NULL. 26 */ 27 char * 28 strsep(stringp, delim) 29 register char **stringp; 30 register const char *delim; 31 { 32 register char *s; 33 register const char *spanp; 34 register int c, sc; 35 char *tok; 36 37 if ((s = *stringp) == NULL) 38 return (NULL); 39 for (tok = s;;) { 40 c = *s++; 41 spanp = delim; 42 do { 43 if ((sc = *spanp++) == c) { 44 if (c == 0) 45 s = NULL; 46 else 47 s[-1] = 0; 48 *stringp = s; 49 return (tok); 50 } 51 } while (sc != 0); 52 } 53 /* NOTREACHED */ 54 } 55