sysdeps/vax/strsep.s

   1 /*-
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * 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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35         .asciz "@(#)strsep.s    5.1 (Berkeley) 5/15/90"
  36 #endif /* LIBC_SCCS and not lint */
  37
  38 /*
  39  * Get next word from string *stringp, where words are
  40  * strings separated by characters from delim.
  41  *
  42  * Writes NULs into the string at *stringp to end tokens.
  43  * On return, *stringp points past the last NUL written (if there might
  44  * be further tokens), or is NULL (if there are definitely no more tokens).
  45  *
  46  * If *stringp is NULL, strtoken returns NULL.
  47  *
  48  * char *
  49  * strtoken(stringp, delim)
  50  *      register char **stringp;
  51  *      register char const *delim;
  52  */
  53 #include "DEFS.h"
  54
  55 ENTRY(strsep, 0)
  56         tstl    *4(ap)          /* if (*stringp == NULL) */
  57         bneq    0f
  58         clrl    r0              #       return (NULL);
  59         ret
  60
  61 0:
  62         subl2   $32,sp          /* make room for 256 bit table */
  63         movc5   $0,(sp),$0,$32,(sp)
  64         movq    4(ap),r1        /* r1 = stringp, r2 = delim */
  65
  66         /* turn on bit for each character in s2, including '\0' */
  67 1:
  68         movzbl  (r2)+,r0
  69         bbss    r0,(sp),1b
  70         bneq    1b
  71
  72         movl    (r1),r3         /* r3 = s = *stringp */
  73         movl    r3,r0           /* save return value */
  74
  75         /* scan for delimiters */
  76 2:
  77         movzbl  (r3)+,r2        /* c = *s++ */
  78         bbc     r2,(sp),2b      /* loop until c is in table */
  79         beql    3f
  80         clrb    -1(r3)          /* if c!='\0', s[-1] = 0 */
  81         movl    r3,(r1)         /* and *stringp = s */
  82         ret
  83 3:
  84         clrl    (r1)            /* else *stringp = NULL */
  85         ret