52 lines
1.2 KiB
Plaintext
52 lines
1.2 KiB
Plaintext
# The OS/K Team licenses this file to you under the MIT license.
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# See the LICENSE file in the project root for more information.
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#---------------------------------------------------------------------------#
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# String manipulation instructions #
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#---------------------------------------------------------------------------#
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#
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# Store value into string (STOSx)
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#
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# [%1] = $2
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# IF (DF == 0) THEN
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# %str = %str + sizeof(x)
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# ELSE
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# %str = %str - sizeof(x)
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# FI
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#
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stosb r ri
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stosw r ri
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stosd r ri
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stosq r ri
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#
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# Scan string for a particular value (SCASx)
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#
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# CMP([%1], $2)
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#
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# IF ([%1] == 0) THEN
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# ZF = 1
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# ELIF (ZF == 0) THEN
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# IF (DF == 0) THEN
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# %1 = %1 + sizeof(x)
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# ELSE
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# %1 = %1 - sizeof(x)
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# FI
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# FI
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#
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# Sets CF, OF and SF according to the result of the comparison
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# Sets ZF according to whether [%1] and $2 are equal, OR if [%1] is null
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#
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# Notes:
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# - Does not move past the value when found
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# - 'SCASB.REP.NZ reg ch' is a short 'strchnul()'
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#
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scasb r ri
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scasw r ri
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scasd r ri
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scasq r ri
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#---------------------------------------------------------------------------#
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