# 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
stosd 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
scasd r ri
scasq r ri

#---------------------------------------------------------------------------#