Annotation of prex/usr/lib/libc/string/strsep.c, Revision 1.1
1.1 ! nbrk 1: /*-
! 2: * Copyright (c) 1990, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * Redistribution and use in source and binary forms, with or without
! 6: * modification, are permitted provided that the following conditions
! 7: * are met:
! 8: * 1. Redistributions of source code must retain the above copyright
! 9: * notice, this list of conditions and the following disclaimer.
! 10: * 2. Redistributions in binary form must reproduce the above copyright
! 11: * notice, this list of conditions and the following disclaimer in the
! 12: * documentation and/or other materials provided with the distribution.
! 13: * 3. Neither the name of the University nor the names of its contributors
! 14: * may be used to endorse or promote products derived from this software
! 15: * without specific prior written permission.
! 16: *
! 17: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 20: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 27: * SUCH DAMAGE.
! 28: */
! 29:
! 30: #include <sys/cdefs.h>
! 31: #include <string.h>
! 32: #include <stdio.h>
! 33:
! 34: /*
! 35: * Get next token from string *stringp, where tokens are possibly-empty
! 36: * strings separated by characters from delim.
! 37: *
! 38: * Writes NULs into the string at *stringp to end tokens.
! 39: * delim need not remain constant from call to call.
! 40: * On return, *stringp points past the last NUL written (if there might
! 41: * be further tokens), or is NULL (if there are definitely no more tokens).
! 42: *
! 43: * If *stringp is NULL, strsep returns NULL.
! 44: */
! 45: char *
! 46: strsep(stringp, delim)
! 47: char **stringp;
! 48: const char *delim;
! 49: {
! 50: char *s;
! 51: const char *spanp;
! 52: int c, sc;
! 53: char *tok;
! 54:
! 55: if ((s = *stringp) == NULL)
! 56: return (NULL);
! 57: for (tok = s;;) {
! 58: c = *s++;
! 59: spanp = delim;
! 60: do {
! 61: if ((sc = *spanp++) == c) {
! 62: if (c == 0)
! 63: s = NULL;
! 64: else
! 65: s[-1] = 0;
! 66: *stringp = s;
! 67: return (tok);
! 68: }
! 69: } while (sc != 0);
! 70: }
! 71: /* NOTREACHED */
! 72: }
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