StrLength PROC

   Returns the length of a null-terminated string in EAX.

Call args:  EDX = offset of the string

Return arg: EAX = number of non-null bytes

Example:

.data
buffer BYTE "abcde",0
bufLength DWORD ?

.code
       mov  edx,OFFSET buffer
       call StrLength
       mov  bufLength,eax
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