mirror of
https://github.com/irmen/prog8.git
synced 2024-12-02 07:49:27 +00:00
79 lines
2.1 KiB
Lua
79 lines
2.1 KiB
Lua
%import textio
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%import string
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%zeropage basicsafe
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main {
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sub start() {
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str name = "irmen@de@jong"
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cx16.r0L = findstr(name, "de-")
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if_cs {
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txt.print("found1. error. ")
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} else {
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txt.print("not found1. ok ")
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}
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txt.print_ub(cx16.r0L)
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txt.nl()
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txt.nl()
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cx16.r0L = findstr(name, "de@")
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if_cs {
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txt.print("found2 (6?). ")
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} else {
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txt.print("not found2. error ")
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}
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txt.print_ub(cx16.r0L)
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txt.nl()
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txt.nl()
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cx16.r0L = findstr(name, "irmen@de@jong")
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if_cs {
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txt.print("found3 (0?). ")
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} else {
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txt.print("not found3. error ")
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}
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txt.print_ub(cx16.r0L)
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txt.nl()
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txt.nl()
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cx16.r0L = findstr(name, "irmen@de@jong1")
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if_cs {
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txt.print("found4. error. ")
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} else {
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txt.print("not found4. ok ")
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}
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txt.print_ub(cx16.r0L)
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txt.nl()
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txt.nl()
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cx16.r0L = findstr(name, "jong")
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if_cs {
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txt.print("found5 (9?). ")
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} else {
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txt.print("not found5. error ")
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}
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txt.print_ub(cx16.r0L)
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txt.nl()
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txt.nl()
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}
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sub findstr(str haystack, str needle) -> ubyte {
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; searches for needle in haystack.
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; returns index in haystack where it first occurs, and Carry set,
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; or if needle doesn't occur in haystack it returns Carry clear and 255 (an invalid index.)
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txt.print_uwhex(haystack, true)
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txt.spc()
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txt.print(haystack)
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txt.nl()
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cx16.r2L = string.length(haystack)
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cx16.r3L = string.length(needle)
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if cx16.r3L <= cx16.r2L {
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cx16.r2L = cx16.r2L-cx16.r3L+1
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repeat cx16.r2L {
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if string.startswith(haystack, needle) {
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sys.set_carry()
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return 13 as ubyte
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}
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haystack++
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}
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}
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sys.clear_carry()
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return 255
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}
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}
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