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  * 4. 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 #if defined(LIBC_SCCS) && !defined(lint)
  31         .asciz "@(#)strsep.s    5.1 (Berkeley) 5/15/90"
  32 #endif /* LIBC_SCCS and not lint */
  33
  34 /*
  35  * Get next word from string *stringp, where words are
  36  * strings separated by characters from delim.
  37  *
  38  * Writes NULs into the string at *stringp to end tokens.
  39  * On return, *stringp points past the last NUL written (if there might
  40  * be further tokens), or is NULL (if there are definitely no more tokens).
  41  *
  42  * If *stringp is NULL, strtoken returns NULL.
  43  *
  44  * char *
  45  * strtoken(stringp, delim)
  46  *      register char **stringp;
  47  *      register char const *delim;
  48  */
  49 #include "DEFS.h"
  50
  51 ENTRY(strsep, 0)
  52         tstl    *4(ap)          /* if (*stringp == NULL) */
  53         bneq    0f
  54         clrl    r0              #       return (NULL);
  55         ret
  56
  57 0:
  58         subl2   $32,sp          /* make room for 256 bit table */
  59         movc5   $0,(sp),$0,$32,(sp)
  60         movq    4(ap),r1        /* r1 = stringp, r2 = delim */
  61
  62         /* turn on bit for each character in s2, including '\0' */
  63 1:
  64         movzbl  (r2)+,r0
  65         bbss    r0,(sp),1b
  66         bneq    1b
  67
  68         movl    (r1),r3         /* r3 = s = *stringp */
  69         movl    r3,r0           /* save return value */
  70
  71         /* scan for delimiters */
  72 2:
  73         movzbl  (r3)+,r2        /* c = *s++ */
  74         bbc     r2,(sp),2b      /* loop until c is in table */
  75         beql    3f
  76         clrb    -1(r3)          /* if c!='\0', s[-1] = 0 */
  77         movl    r3,(r1)         /* and *stringp = s */
  78         ret
  79 3:
  80         clrl    (r1)            /* else *stringp = NULL */
  81         ret