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Add buf_decrpos()

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This commit is contained in:
Matt Johnston
2020-10-24 18:56:45 +08:00
parent 1a208c460b
commit 037d26f055
5 changed files with 17 additions and 11 deletions
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17
buffer.c
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@@ -125,18 +125,23 @@ void buf_incrwritepos(buffer* buf, unsigned int incr) {
}
}
/* increment the position by incr, negative values are allowed, to
* decrement the pos*/
void buf_incrpos(buffer* buf, int incr) {
/* increment the position by incr */
void buf_incrpos(buffer* buf, unsigned int incr) {
if (incr > BUF_MAX_INCR
|| incr < -BUF_MAX_INCR
|| (unsigned int)((int)buf->pos + incr) > buf->len
|| ((int)buf->pos + incr) < 0) {
|| (buf->pos + incr) > buf->len) {
dropbear_exit("Bad buf_incrpos");
}
buf->pos += incr;
}
/* decrement the position by decr */
void buf_decrpos(buffer* buf, unsigned int decr) {
if (decr > buf->pos) {
dropbear_exit("Bad buf_decrpos");
}
buf->pos -= decr;
}
/* Get a byte from the buffer and increment the pos */
unsigned char buf_getbyte(buffer* buf) {