ValueToStringHex
Synopsis
ValueToStringHex(buffer, value, optlen, prefix)
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void ValueToStringHex(APTR, LONG, ULONG, BOOL);C Prototype
void ConvHex(APTR, LONG, LONG, BOOL);Description
Converts a signed 32-bit LONG value into a hexadecimal ASCII string.
If the input value is negative, a - character is prepended to the output string. By default (when optlen is NULL), 8 characters are placed in the buffer. The optlen parameter can be used to specify a different output length.
The prefix parameter controls whether a $ character is prepended to the output.
Inputs
- buffer — Pointer to a buffer that will contain the output string.
- value — The LONG value to convert.
- optlen — Number of characters to place in the output buffer. If NULL, defaults to 8 characters.
- prefix — If TRUE, the
$character is prepended to the buffer.
Result
The buffer is filled with the hexadecimal string representation.
See Also
StringHexToValue, ValueToStringDec, ValueToStringBin
Implementation
The original 68020 assembly implementation:
; (20-Feb-1995) --- ValueToStringHex(buffer, value, optlen, prefix) (a0,d0,d1,d2)
_LVOValueToStringHex
movem.l d2-d7/a0,-(sp)
tst.l d1
bne.s ConvHex_Default
moveq #8,d1
ConvHex_Default
moveq #$f,d5
moveq #48,d6
moveq #58,d7
cmpi.l #8,d1
bhi.s ConvHex_Exit
move.l d1,d3
rol.w #2,d3
ror.l d3,d0
subq.l #1,d1
tst.l d2
beq.s ConvHex_Next
move.b #"$",(a0)+
ConvHex_Next
rol.l #4,d0
move.l d0,d3
and.b d5,d3
add.b d6,d3
cmp.b d7,d3
bcs.s ConvHex_Out
addq.b #7,d3
ConvHex_Out
move.b d3,(a0)+
dbf d1,ConvHex_Next
ConvHex_Exit
movem.l (sp)+,d2-d7/a0
rtsLast updated on