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Handle invalid hex escapes in seq

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This commit is contained in:
Eirikr Hinngart 2025-05-17 00:53:05 -07:00
parent 4db99f4012
commit 487fcb4bff
1 changed files with 6 additions and 1 deletions
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7
usr.bin/seq/seq.c
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@ -350,8 +350,13 @@ unescape(char *orig)
*orig = c; *orig = c;
--cp; --cp;
continue; continue;
case 'x': /* hexidecimal number */ case 'x': /* hexadecimal number */
cp++; /* skip 'x' */ cp++; /* skip 'x' */
if (!isxdigit((unsigned char)*cp)) {
--cp;
/* keep the backslash, treat 'x' literally */
continue;
}
for (i = 0, c = 0; for (i = 0, c = 0;
isxdigit((unsigned char)*cp) && i < 2; isxdigit((unsigned char)*cp) && i < 2;
i++, cp++) { i++, cp++) {