[SECTION text] extern ctime extern getchar extern printf in VS .NET

Maker Denso QR Bar Code in VS .NET [SECTION text] extern ctime extern getchar extern printf
[SECTION text] extern ctime extern getchar extern printf
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extern localtime extern time global main ; Required so linker can find entry point
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main: push ebp ; Set up stack frame for debugger mov ebp,esp push ebx ; Program must preserve ebp, ebx, esi, & edi push esi push edi ;;; Everything before this is boilerplate; use it for all ordinary apps! ;;; Generate a time_t calendar time value with clib's time function============ push dword 0 ; Push a 32-bit null pointer to stack, since ; we don't need a buffer Time value is ; returned in eax call time ; Returns calendar time in eax add esp, byte 4 ; Clean up stack after call mov [oldtime],eax ; Save time value in memory variable ;;; Generate a string summary of local time with clib's ctime function========= push dword oldtime ; Push address of calendar time value call ctime ; Returns pointer to ASCII time string in eax add esp, byte 4 ; Clean up stack after call push eax push dword timemsg call printf add esp, byte 8 ; ; ; ; Push pointer to ASCII time string on stack Push pointer to base message text string Merge and display the two strings Clean up stack after call
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;;; Generate local time values into clib's static tm struct==================== push dword oldtime ; Push address of calendar time value call localtime ; Returns pointer to static time structure in eax add esp, byte 4 ; Clean up stack after call ;;; Make a local copy of clib's static tm struct=============================== mov esi, eax ; Copy address of static tm from eax to esi mov edi, dword tmcopy ; Put the address of the local tm copy in edi mov ecx,9 ; A tm struct is 9 dwords in size under Linux cld ; Clear df to 0 so we move up-memory rep movsd ; Copy static tm struct to local copy in bss ;;; Display one of the fields in the tm structure============================== mov edx, dword [tmcopy+20] ; Year value is 20 bytes offset into tm push edx ; Push value onto the stack push dword yrmsg ; Push address of the base string call printf ; Display string and year value with printf add esp, byte 8 ; Clean up the stack ;;; Wait a few seconds for user to press Enter so we have a time difference==== call getchar ;;; Calculating seconds passed since program began running with difftime======= push dword 0 ; Push null ptr; we'll take value in eax call time ; Get current time value; return in eax add esp, byte 4 ; Clean up the stack mov [newtime],eax ; Save new time value sub eax,[oldtime] mov [timediff],eax ; Calculate time difference value ; Save time difference value
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push dword [timediff] ; Push difference in seconds onto the stack
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push dword elapsed call printf add esp, byte 8
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; Push addr of elapsed time message string ; Display elapsed time ; Clean up the stack
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;;; Everything after this is boilerplate; use it for all ordinary apps! pop edi ; Restore saved registers pop esi pop ebx mov esp,ebp ; Destroy stack frame before returning pop ebp ret ; Return control to Linux [SECTION data] ; Section containing initialized data
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timemsg db "Hey, what time is it It's %s",10,0 yrmsg db "The year is 19%d",10,0 elapsed db "A total of %d seconds has elapsed since program began running",10,0 [SECTION bss] oldtime newtime timediff timestr tmcopy resd resd resd resb resd 1 1 1 40 9 ; Section containing uninitialized data ; Reserve 3 integers (doubles) for time values
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; Reserve 40 bytes for time string ; Reserve 9 integer fields for time struct tm
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As our next jump on this quick tour of Unix library calls from assembly, let's get seriously random (Or modestly pseudorandom, at least) The standard C library has a pair of functions that allow programs to generate pseudorandom numbers The pseudo is significant here Research indicates that there is no provable way to generate a truly random random number strictly from software In fact, the whole notion of what random really means is a spooky one and keeps a lot of mathematicians off the streets these days Theoretically you'd need to obtain triggers from some sort of quantum phenomenon (radioactivity is the one most often mentioned) to achieve true randomness But lacking a nuclear-powered random-number generator, we'll have to fall back on pseudo-ness and learn to live with it A simplified definition of pseudorandom would run something like this: A pseudorandom-number generator yields a sequence of numbers of no recognizable pattern, but the sequence can be repeated by passing the same seed value to the generator A seed value is simply a whole number that acts as an input value to an arcane algorithm that creates the sequence of pseudorandom numbers Pass the same seed to the generator, and you get the same sequence However, within the sequence, the distribution of numbers within the generator's range is reasonably scattered and random The standard C library contains two functions relating to pseudorandom numbers: The srand function passes a new seed value to the random-number generator This value must be a 32bit integer If no seed value is passed, the value defaults to 1 The rand function returns a 31-bit pseudorandom number The high bit is always 0 and thus the value is always positive if treated as a 32-bit signed integer Once you understand how they work, using them is close to trivial
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