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Annotation of 43BSDReno/lib/libc/vax/string/strsep.s, revision 1.1

1.1     ! root        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 are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(LIBC_SCCS) && !defined(lint)
        !            21:        .asciz "@(#)strsep.s    5.1 (Berkeley) 5/15/90"
        !            22: #endif /* LIBC_SCCS and not lint */
        !            23: 
        !            24: /*
        !            25:  * Get next word from string *stringp, where words are
        !            26:  * strings separated by characters from delim.
        !            27:  *
        !            28:  * Writes NULs into the string at *stringp to end tokens.
        !            29:  * On return, *stringp points past the last NUL written (if there might
        !            30:  * be further tokens), or is NULL (if there are definitely no more tokens).
        !            31:  *
        !            32:  * If *stringp is NULL, strtoken returns NULL.
        !            33:  *
        !            34:  * char *
        !            35:  * strtoken(stringp, delim)
        !            36:  *     register char **stringp;
        !            37:  *     register char const *delim;
        !            38:  */
        !            39: #include "DEFS.h"
        !            40: 
        !            41: ENTRY(strsep, 0)
        !            42:        tstl    *4(ap)          /* if (*stringp == NULL) */
        !            43:        bneq    0f
        !            44:        clrl    r0              #       return (NULL);
        !            45:        ret
        !            46: 
        !            47: 0:
        !            48:        subl2   $32,sp          /* make room for 256 bit table */
        !            49:        movc5   $0,(sp),$0,$32,(sp)
        !            50:        movq    4(ap),r1        /* r1 = stringp, r2 = delim */
        !            51: 
        !            52:        /* turn on bit for each character in s2, including '\0' */
        !            53: 1:
        !            54:        movzbl  (r2)+,r0
        !            55:        bbss    r0,(sp),1b
        !            56:        bneq    1b
        !            57: 
        !            58:        movl    (r1),r3         /* r3 = s = *stringp */
        !            59:        movl    r3,r0           /* save return value */
        !            60: 
        !            61:        /* scan for delimiters */
        !            62: 2:
        !            63:        movzbl  (r3)+,r2        /* c = *s++ */
        !            64:        bbc     r2,(sp),2b      /* loop until c is in table */
        !            65:        beql    3f
        !            66:        clrb    -1(r3)          /* if c!='\0', s[-1] = 0 */
        !            67:        movl    r3,(r1)         /* and *stringp = s */
        !            68:        ret
        !            69: 3:
        !            70:        clrl    (r1)            /* else *stringp = NULL */
        !            71:        ret

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