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Allow shifting macro arguments by a negative amount

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Fixes #733
This commit is contained in:
Rangi
2021-02-12 23:09:06 -05:00
committed by Eldred Habert
parent 96bce05be2
commit 8f20620c16
5 changed files with 18 additions and 5 deletions
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4
src/asm/macro.c
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@@ -168,12 +168,12 @@ void macro_ShiftCurrentArgs(int32_t count)
{
if (!macroArgs) {
error("Cannot shift macro arguments outside of a macro\n");
} else if (count < 0) {
error("Cannot shift arguments by negative amount %" PRId32 "\n", count);
} else if (macroArgs->shift < macroArgs->nbArgs) {
macroArgs->shift += count;
if (macroArgs->shift > macroArgs->nbArgs)
macroArgs->shift = macroArgs->nbArgs;
else if (macroArgs->shift < 0)
macroArgs->shift = 0;
}
}

1
src/asm/rgbasm.5
View File

@@ -1487,6 +1487,7 @@ This is the only way of accessing the value of arguments from 10 to 256.
.Pp
.Ic SHIFT
can optionally be given an integer parameter, and will apply the above shifting that number of times.
A negative parameter will shift the arguments in reverse.
.Ss Printing things during assembly
The
.Ic PRINT