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kvisc/vm/in/STRING
2019-07-18 22:49:31 +02:00

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