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dcs: decrqss: use a custom put() handler

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Only buffer up to two bytes, as that’s the largest DECRQSS request we
support.
This commit is contained in:
Daniel Eklöf 2022-03-19 20:13:49 +01:00
parent 8f06436985
commit af88c19561
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GPG key ID: 5BBD4992C116573F
1 changed files with 36 additions and 22 deletions
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58
dcs.c
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@ -10,6 +10,26 @@
#include "vt.h"
#include "xmalloc.h"
static bool
ensure_size(struct terminal *term, size_t required_size)
{
if (required_size <= term->vt.dcs.size)
return true;
size_t new_size = (required_size + 127) / 128 * 128;
xassert(new_size > 0);
uint8_t *new_data = realloc(term->vt.dcs.data, new_size);
if (new_data == NULL) {
LOG_ERRNO("failed to increase size of DCS buffer");
return false;
}
term->vt.dcs.data = new_data;
term->vt.dcs.size = new_size;
return true;
}
/* Decode hex-encoded string *inline*. NULL terminates */
static char *
hex_decode(const char *s, size_t len)
@ -200,7 +220,20 @@ append_sgr_attr_n(char **reply, size_t *len, const char *attr, size_t n)
}
static void
decrqss(struct terminal *term)
decrqss_put(struct terminal *term, uint8_t c)
{
/* Largest request we support is two bytes */
if (!ensure_size(term, 2))
return;
struct vt *vt = &term->vt;
if (vt->dcs.idx > 2)
return;
vt->dcs.data[vt->dcs.idx++] = c;
}
static void
decrqss_unhook(struct terminal *term)
{
const uint8_t *query = term->vt.dcs.data;
const size_t n = term->vt.dcs.idx;
@ -387,7 +420,8 @@ dcs_hook(struct terminal *term, uint8_t final)
case '$':
switch (final) {
case 'q':
term->vt.dcs.unhook_handler = &decrqss;
term->vt.dcs.put_handler = &decrqss_put;
term->vt.dcs.unhook_handler = &decrqss_unhook;
break;
}
break;
@ -418,26 +452,6 @@ dcs_hook(struct terminal *term, uint8_t final)
}
}
static bool
ensure_size(struct terminal *term, size_t required_size)
{
if (required_size <= term->vt.dcs.size)
return true;
size_t new_size = (required_size + 127) / 128 * 128;
xassert(new_size > 0);
uint8_t *new_data = realloc(term->vt.dcs.data, new_size);
if (new_data == NULL) {
LOG_ERRNO("failed to increase size of DCS buffer");
return false;
}
term->vt.dcs.data = new_data;
term->vt.dcs.size = new_size;
return true;
}
void
dcs_put(struct terminal *term, uint8_t c)
{