source: trunk/libs/newlib/src/newlib/libc/machine/i960/strpbrk.S @ 690

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 * Copyright (c) 1993 Intel Corporation
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/*
 * (c) copyright 1989,1993 Intel Corp., all rights reserved
 */

/*
        procedure strpbrk  (optimized assembler version: 80960K series, 80960CA)

        char_addr = strpbrk (string, brkset_string)

        Return the address of the first character in string that is NOT
        in the brkset_string.  Return NULL if none exists.

        At the time of this writing, only g0 thru g7 and g13 are available 
        for use in this leafproc;  other registers would have to be saved and
        restored.  These nine registers, plus tricky use of g14 are sufficient
        to implement the routine.

        This routine stays out of g3 and g4 altogether.  They may be used by 
        the strtok routine, which calls this routine in an incestuous way.
*/
#ifdef  __PIC
        .pic
#endif
#ifdef  __PID
        .pid
#endif

        .file "strprk.s"
        .globl  _strpbrk
        .globl  __strpbrk
        .leafproc       _strpbrk, __strpbrk
        .align  2

_strpbrk:
#ifdef __PIC
        lda     Lrett-(.+8)(ip),g14
        b       __strpbrk
#else
        lda     Lrett,g14
        b       __strpbrk
#endif

Lrett:  ret

__strpbrk:

Lnext_char_strpbrk:
        addo    1,g1,g2         # g2 will be the brkset ptr
        ldob    (g0),g7         # fetch next character of string
        ldob    (g1),g6         # fetch first character of brkset
        cmpobe.f 0,g7,Lexit_char_not_found      # quit if at end of string
Lscan_set_strpbrk:
        cmpo    g6,g7           # is brkset char equal to string char?
        ldob    (g2),g5         # fetch next brkset char
        addo    1,g2,g2         # bump brkset ptr
        be.f    Lexit_char_found
        cmpo    g6,0            # is brkset_string exhausted?
        lda     (g5),g6
        bne.t   Lscan_set_strpbrk # check next character of brkset
        addo    1,g0,g0         # check next character of string
        b       Lnext_char_strpbrk

Lexit_char_not_found:
        mov     0,g0            # return null if brkset char not found in string
Lexit_char_found:
        mov     g14,g13         # save return address
        lda     0,g14           # conform to register conventions
        bx      (g13)

/* end of strpbrk */