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39 * (c) copyright 1989,1993 Intel Corp., all rights reserved
43 procedure strcspn (optimized assembler version: 80960K series, 80960CA)
45 len = strcspn (string, charset)
47 Return the number of characters in the maximum leading segment
48 of string which consists solely of characters NOT from charset.
50 At the time of this writing, only g0 thru g7 and g13 are available
51 for use in this leafproc; other registers would have to be saved and
52 restored. These nine registers, plus tricky use of g14 are sufficient
53 to implement the routine.
58 .leafproc _strcspn, __strcspn
65 lda Lrett-(.+8)(ip),g14
68 mov g14,g13 # save return address
69 lda (g0),g3 # copy string pointer
70 mov 0,g14 # conform to register conventions
73 ldob (g3),g7 # fetch next character of string
74 addo 1,g1,g2 # g2 will be the charset ptr
75 ldob (g1),g6 # fetch first character of charset
76 cmpobe.f 0,g7,Lexit # quit if at end of string
78 cmpo g6,g7 # is charset char same as string char?
79 ldob (g2),g5 # fetch next charset char
80 addo 1,g2,g2 # bump charset ptr
82 cmpo g6,0 # is charset exhausted?
84 bne.t Lscan_set # check next character of charset
85 addo 1,g3,g3 # check next character of string
89 subo g0,g3,g0 # compute string length