Re: [libvirt] [PATCHv2 2/5] Add functions dealing with control characters in strings

Add virStringHasControlChars that checks if the string has any control characters other than \t\r\n, and virStringStripControlChars that removes them in-place. --- src/libvirt_private.syms | 2 ++ src/util/virstring.c | 39 +++++++++++++++++++++++++++++++++++++++ src/util/virstring.h | 2 ++ tests/virstringtest.c | 39 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 82 insertions(+) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 7166283..d37a6b5 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -2134,6 +2134,7 @@ virStrdup; virStringArrayHasString; virStringFreeList; virStringFreeListCount; +virStringHasControlChars; virStringIsEmpty; virStringJoin; virStringListLength; @@ -2143,6 +2144,7 @@ virStringSortCompare; virStringSortRevCompare; virStringSplit; virStringSplitCount; +virStringStripControlChars; virStringStripIPv6Brackets; virStrncpy; virStrndup; diff --git a/src/util/virstring.c b/src/util/virstring.c index 3dad9dd..9eb48b5 100644 --- a/src/util/virstring.c +++ b/src/util/virstring.c @@ -968,3 +968,42 @@ virStringStripIPv6Brackets(char *str) str[len - 2] = '\0'; } } + +static const char control_chars[] = + "\x01\x02\x03\x04\x05\x06\x07" + "\x08" /* \t \n */ "\x0B\x0C" /* \r */ "\x0E\x0F"

+ "\x10\x11\x12\x13\x14\x15\x16\x17" + "\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F"; + +bool +virStringHasControlChars(const char *str) +{ + if (!str) + return false; + + return strcspn(str, control_chars) != strlen(str); +}

+/** + * virStringStripControlChars: + * @str: the string to strip + * + * Modify the string in-place to remove the control characters + * in the interval: (0x01, 0x20)

+ */ +void +virStringStripControlChars(char *str) +{ + size_t len, i, j; + + if (!virStringHasControlChars(str)) + return;

+ + len = strlen(str); + for (i = 0, j = 0; i < len; i++) { + if (index(control_chars, str[i])) + continue;

+ + str[j++] = str[i]; + } + str[j] = '\0'; +}