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Added control character check

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Added control character check, returning -1 (to "err") if control characters are present.
This commit is contained in:
tomspiderlabs 2023-03-23 23:39:38 +00:00 committed by Serge Hallyn
parent bd2d0079c9
commit e5905c4b84
1 changed files with 7 additions and 4 deletions
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11
lib/fields.c
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@ -21,9 +21,9 @@
* *
* The supplied field is scanned for non-printable and other illegal * The supplied field is scanned for non-printable and other illegal
* characters. * characters.
* + -1 is returned if an illegal character is present. * + -1 is returned if an illegal or control character is present.
* + 1 is returned if no illegal characters are present, but the field * + 1 is returned if no illegal or control characters are present,
* contains a non-printable character. * but the field contains a non-printable character.
* + 0 is returned otherwise. * + 0 is returned otherwise.
*/ */
int valid_field (const char *field, const char *illegal) int valid_field (const char *field, const char *illegal)
@ -45,10 +45,13 @@ int valid_field (const char *field, const char *illegal)
} }
if (0 == err) { if (0 == err) {
/* Search if there are some non-printable characters */ /* Search if there are non-printable or control characters */
for (cp = field; '\0' != *cp; cp++) { for (cp = field; '\0' != *cp; cp++) {
if (!isprint (*cp)) { if (!isprint (*cp)) {
err = 1; err = 1;
}
if (!iscntrl (*cp)) {
err = -1;
break; break;
} }
} }