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50  
51 <h1> words/char-scan.asm </h1>
52  
53 <p>
54 <input type=button onClick="history.back()" value="Back">
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56 <a href="../WordList.en.html">Jump to Vocabulary</a>
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58  
59 <pre>
60 ; ( addr1 n1 c -- addr1 n2 ) String
61 ; R( -- )
62 ; Scan string at addr1/n1 until first c, leaving addr1/n2, char at n2 is last non-c character
63 VE_CSCAN:
64 .db $05, &quot;cscan&quot;
65 .dw VE_HEAD
66 .set VE_HEAD = VE_CSCAN
67 XT_CSCAN:
68 .dw DO_COLON
69 PFA_CSCAN:
70 .dw XT_SWAP ; ( -- addr1 c n1 )
71 .dw XT_DUP ; ( -- addr1 c n1 n1)
72 .dw XT_TO_R ; ( -- addr1 c n1)
73 .dw XT_ZERO ; ( -- addr1 c n1 0)
74 .dw XT_DODO ; ( -- addr1 c)
75 .dw PFA_CSCAN3
76 PFA_CSCAN1:
77 .dw XT_OVER ; ( -- addr1 c addr1 )
78 .dw XT_I ; ( -- addr1 c addr1 i)
79 .dw XT_PLUS ; ( -- addr1 c addr')
80 .dw XT_CFETCH ; ( -- addr1 c c')
81 .dw XT_OVER ; ( -- addr1 c c' c)
82 .dw XT_EQUAL ; ( -- addr1 c f)
83 .dw XT_DOCONDBRANCH ; ( -- addr1 c)
84 .dw PFA_CSCAN2
85 .dw XT_DROP ; ( -- addr1 )
86 .dw XT_I ; ( -- addr1 n2)
87 .dw XT_UNLOOP ; ( -- addr1 n2)
88 .dw XT_R_FROM ; ( -- addr1 n2 n1)
89 .dw XT_DROP ; ( -- addr1 n2)
90 .dw XT_EXIT
91 PFA_CSCAN2:
92 .dw XT_DOLOOP
93 .dw PFA_CSCAN1 ; ( -- addr1 c)
94 PFA_CSCAN3:
95 .dw XT_DROP ; ( -- addr1)
96 .dw XT_R_FROM ; ( -- addr1 n1)
97 .dw XT_EXIT
98 </pre>
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