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Fix cpp.ansi crash when stringifying missing macro argument

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Fixes https://github.com/davidgiven/ack/issues/238
This commit is contained in:
tkchia 2022-08-02 15:28:21 +00:00
parent afd6f30812
commit 3b1d440d5c
1 changed files with 27 additions and 23 deletions
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50
lang/cem/cpp.ansi/replace.c
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@ -706,32 +706,36 @@ static char *stringify(
assert(n != 0); assert(n != 0);
p = args->a_rawvec[n-1]; p = args->a_rawvec[n-1];
add2repl(repl, '"'); add2repl(repl, '"');
while (*p) {
if (is_wsp(*p)) {
if (!space) {
space = 1;
add2repl(repl, ' ');
}
p++;
continue;
}
space = 0;
if (!delim && (*p == '"' || *p == '\'')) if (p) {
delim = *p; while (*p) {
else if (*p == delim && !backslash) if (is_wsp(*p)) {
delim = 0; if (!space) {
backslash = *p == '\\'; space = 1;
if (*p == '"' || (delim && *p == '\\')) add2repl(repl, ' ');
add2repl(repl, '\\'); }
if (*p == TOKSEP || *p == NOEXPM) p++; p++;
else add2repl(repl, *p++); continue;
}
space = 0;
if (!delim && (*p == '"' || *p == '\''))
delim = *p;
else if (*p == delim && !backslash)
delim = 0;
backslash = *p == '\\';
if (*p == '"' || (delim && *p == '\\'))
add2repl(repl, '\\');
if (*p == TOKSEP || *p == NOEXPM) p++;
else add2repl(repl, *p++);
}
/* trim spaces in the replacement list */
for (--repl->r_ptr; is_wsp(*repl->r_ptr); repl->r_ptr--)
/* EMPTY */;
++repl->r_ptr; /* oops, one to far */
} }
/* trim spaces in the replacement list */
for (--repl->r_ptr; is_wsp(*repl->r_ptr); repl->r_ptr--)
/* EMPTY */;
++repl->r_ptr; /* oops, one to far */
add2repl(repl, '"'); add2repl(repl, '"');
} else } else
error("illegal use of # operator"); error("illegal use of # operator");