.file "strpbrk.s" # @(#)strpbrk.s 1.5 # Fast assembler language version of the following C-program # strpbrk # which represents the `standard' for the C-library. # Return ptr to first occurance of any character from `brkset' # in the character string `string'; NULL if none exists. # char * # strpbrk(string, brkset) # register char *string, *brkset; # { # register char *p; # # if(!string || !brkset) # return(0); # do { # for(p=brkset; *p != '\0' && *p != *string; ++p) # ; # if(*p != '\0') # return(string); # } # while(*string++); # return(0); # } .globl _strpbrk .text .align 2 _strpbrk: .word 0x0000 # pgm uses regs 0,1,2,3,4 movab -256(sp),sp # get table space movc5 $0,(ap),$0,$256,(sp) # and zero it out movl 8(ap),r0 # charset ptr in r0 beql L5 # return 0 if arg was NULL L0: movzbl (r0)+,r3 # byte from charset for index beql L1 # hop if found ending NULL movb $255,(sp)[r3] # make entry in scanc table jmp L0 # get next byte from charset L1: movl 4(ap),r1 # string ptr in r1 beql L4 # if it's NULL, return 0 L2: movl r1,r4 # preserve a copy of this ptr locc $0,$65535,(r1) # get length of string bneq L3 # skip if string not > 65535 scanc $65535,(r4),(sp),$255 # else scanc the first 65535 bneq L4 # hop ahead if we found one jmp L2 # else go back and do next 65535 L3: subl3 r4,r1,r0 # length to end of string in r0 scanc r0,(r4),(sp),$255 # this is the main function beql L5 # skip if none (r0 already 0) L4: movl r1,r0 # return ptr to brk char L5: movab 256(sp),sp # restore the stack pointer ret