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optimize pline("%s",string)

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pline() already skips sprintf/vsnprintf if the format doesn't contain
any percent signs.  Do the same if the entire format is "%s".

Also, if ESC is used to suppress messages for the rest of the current
move, the text for any impossible warnings issued during that time
would be suppressed too so not be seen.
This commit is contained in:
PatR
2023-04-24 16:34:48 -07:00
parent 2308e2480d
commit 57ff993352
2 changed files with 30 additions and 17 deletions
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45
src/pline.c
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@@ -99,7 +99,6 @@ vpline(const char *line, va_list the_args)
char pbuf[BIGBUFSZ]; /* will get chopped down to BUFSZ-1 if longer */
int ln;
int msgtyp;
int vlen = 0;
boolean no_repeat;
if (!line || !*line)
@@ -111,24 +110,33 @@ vpline(const char *line, va_list the_args)
if (gp.program_state.wizkit_wishing)
return;
if (strchr(line, '%')) {
vlen = vsnprintf(pbuf, sizeof(pbuf), line, the_args);
#if (NH_DEVEL_STATUS != NH_STATUS_RELEASED) && defined(DEBUG)
if (vlen >= (int) sizeof pbuf)
panic("%s: truncation of buffer at %zu of %d bytes",
"pline", sizeof pbuf, vlen);
#else
nhUse(vlen);
#endif
if (!strchr(line, '%')) {
/* format does not specify any substitutions; use it as-is */
ln = (int) strlen(line);
} else if (line[0] == '%' && line[1] == 's' && !line[2]) {
/* "%s" => single string; skip format and use its first argument;
unlike with the format, it is irrelevant whether the argument
contains any percent signs */
line = va_arg(the_args, const char *); /*VA_NEXT(line,const char *);*/
ln = (int) strlen(line);
} else {
/* perform printf() formatting */
ln = vsnprintf(pbuf, sizeof pbuf, line, the_args);
line = pbuf;
/* note: 'ln' is number of characters attempted, not necessarily
strlen(line); that matters for the overflow check; if we avoid
the extremely-too-long panic then 'ln' will be actual length */
}
if ((ln = (int) strlen(line)) > BUFSZ - 1) {
if (line != pbuf) /* no '%' was present */
(void) strncpy(pbuf, line, BUFSZ - 1); /* caveat: unterminated */
/* truncate, preserving the final 3 characters:
"___ extremely long text" -> "___ extremely l...ext"
if (ln > (int) sizeof pbuf - 1) /* extremely too long */
panic("pline attempting to print %d characters!", ln);
if (ln > BUFSZ - 1) {
/* too long but modestly so; allow but truncate, preserving final
3 chars: "___ extremely long text" -> "___ extremely l...ext"
(this may be suboptimal if overflow is less than 3) */
memcpy(pbuf + BUFSZ - 1 - 6, "...", 3);
if (line != pbuf) /* no '%' was present or format was just "%s" */
(void) strncpy(pbuf, line, BUFSZ - 1); /* caveat: unterminated */
pbuf[BUFSZ - 1 - 6] = pbuf[BUFSZ - 1 - 5] = pbuf[BUFSZ - 1 - 4] = '.';
/* avoid strncpy; buffers could overlap if excess is small */
pbuf[BUFSZ - 1 - 3] = line[ln - 3];
pbuf[BUFSZ - 1 - 2] = line[ln - 2];
@@ -503,13 +511,16 @@ impossible(const char *s, ...)
panic("impossible called impossible");
gp.program_state.in_impossible = 1;
(void) vsnprintf(pbuf, sizeof(pbuf), s, the_args);
(void) vsnprintf(pbuf, sizeof pbuf, s, the_args);
va_end(the_args);
pbuf[BUFSZ - 1] = '\0'; /* sanity */
paniclog("impossible", pbuf);
if (iflags.debug_fuzzer)
panic("%s", pbuf);
gp.pline_flags = URGENT_MESSAGE;
pline("%s", pbuf);
gp.pline_flags = 0;
/* reuse pbuf[] */
Strcpy(pbuf, "Program in disorder!");
if (gp.program_state.something_worth_saving)