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Make strcat and strncat work properly when first string crosses a bank boundary.

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Previously, the pointer was not properly updated to account for the bank crossing, so the characters from the second string would be written to the wrong bank.

Here is an example that illustrates this:

#include <memory.h>
#include <string.h>
#include <orca.h>
#include <stdio.h>
int main(void) {
        Handle hndl = NewHandle(0x1000f, userid(), 0xC000, 0);
        if (toolerror())
                return 0;
        char *s = *hndl;
        s = (void*)((unsigned long)s | 0xffff);
        strcpy(s, "foo");
        strcat(s, "bar");
        strncat(s, "baz", 5);
        puts(s);
}
This commit is contained in:
Stephen Heumann 2024-02-18 21:01:01 -06:00
parent bf3a4d7ceb
commit b60c307ee6
1 changed files with 6 additions and 2 deletions
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8
string.asm
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@ -616,7 +616,9 @@ lb2 long M
clc
adc s1
sta s1
short M copy characters 'til the null is found
bcc lb2a
inc s1+2
lb2a short M copy characters 'til the null is found
ldy #0
lb3 lda [s2],Y
sta [s1],Y
@ -1013,7 +1015,9 @@ lb2 long M
clc
adc s1
sta s1
short M copy characters 'til the null is found
bcc lb2a
inc s1+2
lb2a short M copy characters 'til the null is found
ldy #0
ldx n
beq lb4