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Made some string output functions reject an invalid NULL buffer pointer.

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This commit is contained in:
Greg King 2015-07-09 14:46:28 -04:00
parent 219905c6bc
commit 146daa1d0a
1 changed files with 13 additions and 1 deletions
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14
libsrc/common/vsnprintf.s
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@ -86,9 +86,16 @@ L1: dex
sta bufptr+0 sta bufptr+0
stx bufptr+1 stx bufptr+1
; There must be a buffer if its size is non-zero.
bit bufsize+1
bmi L5
ora bufptr+1
bze L0 ; The pointer shouldn't be NULL
; Restore ap and call _printf ; Restore ap and call _printf
pla L5: pla
tax tax
pla pla
jsr __printf jsr __printf
@ -125,6 +132,11 @@ L4: lda ccount+0
; Bail out if size is too high. ; Bail out if size is too high.
L9: lda #ERANGE L9: lda #ERANGE
.byte $2C ;(bit $xxxx)
; NULL buffer pointers usually are invalid.
L0: lda #EINVAL
jsr __directerrno ; Return -1 jsr __directerrno ; Return -1
jmp incsp6 ; Drop parameters jmp incsp6 ; Drop parameters