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authorHarald Welte <laforge@gnumonks.org>2017-10-03 17:41:59 +0800
committerHarald Welte <laforge@gnumonks.org>2017-10-24 16:00:44 +0000
commitfebe83c4243520ccc64544026d5f496ef945a9aa (patch)
treee1b160b672ab974725a3b1c8cf6fe2953afc3e22 /src
parentc8ef736370483df6feb761b49fccaa6790b6f8c2 (diff)
Introduce osmo_identifier_valid() function to check validity of identifier
We define the notion of an 'osmocom identifier' which is basically a 7-bit US-ASCII without any special characters beyond "-_:@". We introduce a function to verify if an identifier consists only of the permitted characters. Change-Id: I96a8d345c5a69238a12d040f39b70c485a5c421c
Diffstat (limited to 'src')
-rw-r--r--src/utils.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/src/utils.c b/src/utils.c
index 534916b6..ef8e916e 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -22,6 +22,7 @@
*/
+#include <stdbool.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
@@ -411,6 +412,33 @@ bool osmo_is_hexstr(const char *str, int min_digits, int max_digits,
return false;
if (require_even && (len & 1))
return false;
+
+ return true;
+}
+
+/*! Determine if a given identifier is valid, i.e. doesn't contain illegal chars
+ * \param[in] str String to validate
+ * \returns true in case string contains valid identifier, false otherwise
+ */
+bool osmo_identifier_valid(const char *str)
+{
+ /* characters that are illegal in names */
+ static const char illegal_chars[] = "., {}[]()<>|~\\^`'\"?=;/+*&%$#!";
+ unsigned int i;
+
+ /* an empty string is not a valid identifier */
+ if (!str || strlen(str) == 0)
+ return false;
+
+ for (i = 0; i < strlen(str); i++) {
+ /* check for 7-bit ASCII */
+ if (str[i] & 0x80)
+ return false;
+ /* check for some explicit reserved control characters */
+ if (strchr(illegal_chars, str[i]))
+ return false;
+ }
+
return true;
}