Find a string

'''DOS pseudo functions: Find a string'''

'''Syntax:'''
  DOSMS(AX-value, BX-value, CX-value, DX-value) EXCP=statement-label  
'''Entry:'''
    AX = "@FFFC@"
                                                                                                                            .
     Upon execution of the DOSMS function, the AX register acts as
     a "countdown" field. If the number of occurrences of the
     search string is found, the value in this register is 0. A
     non-0 value means that an end-of-file was encountered before
     the specified number of occurrences were found.
                                                                                                                            .
  BX = file handle
  CX = number of occurrences to find (in hex)
  DX = the search string

 
'''Discussion:'''
This pseudo function searches an entire file for a specified string in forward record order (physical order). <br>
If the string is found anywhere within the file, the file pointer is positioned at the physical record where the string was found. <br>
The search starts at current position in the file.