File:Zstr count x86 assembly.png
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Summary[edit]
| Description |
English: zstr_count function that implemented using x86 assembly |
| Date | |
| Source | https://en.wikipedia.org/w/index.php?title=Assembly_language&action=edit§ion=20 |
| Author | OldCodger2 |
Original source code text[edit]
00000030 B9FFFFFFFF
00000035 41
00000036 803C0800
0000003A 75F9
0000003C C3
|
;-----------------------------------------------------------
; zstr_count:
; Counts a zero-terminated ASCII string to determine its size
; in: eax = start address of the zero terminated string
; out: ecx = count = the length of the string
zstr_count: ; Entry point
mov ecx, -1 ; Init the loop counter, pre-decrement
; to compensate for the increment
.loop:
inc ecx ; Add 1 to the loop counter
cmp byte [eax + ecx], 0 ; Compare the value at the string's
; [starting memory address Plus the
; loop offset], to zero
jne .loop ; If the memory value is not zero,
; then jump to the label called '.loop',
; otherwise continue to the next line
.done:
; We don't do a final increment,
; because even though the count is base 1,
; we do not include the zero terminator in the
; string's length
ret ; Return to the calling program
|
Licensing[edit]
|
This work has been released into the public domain by its author, OldCodger2. This applies worldwide. In some countries this may not be legally possible; if so: |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:23, 19 January 2016 | | 945 × 467 (133 KB) | Cedar101 (talk | contribs) | {{subst:Upload marker added by en.wp UW}} {{Information |Description = {{en|zstr_count function that implemented using x86 assembly}} |Source = {{own}} |Date = 2016-01-19 |Author = Cedar101 }} |
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