location-export: Validate country codes

[people/ms/libloc.git] / src / country.c

diff --git a/src/country.c b/src/country.c
index 909895047f922eeb5578c016b21f29f51a7af5f2..45d26b82ef49dd156df61b6d66555185c37e5f33 100644 (file)
--- a/src/country.c
+++ b/src/country.c
@@ -172,3 +172,22 @@ int loc_country_to_database_v0(struct loc_country* country,
 
        return 0;
 }
+
+LOC_EXPORT int loc_country_code_is_valid(const char* cc) {
+       // It cannot be NULL
+       if (!cc || !*cc)
+               return 0;
+
+       // It must be 2 characters long
+       if (strlen(cc) != 2)
+               return 0;
+
+       // It must only contain A-Z
+       for (unsigned int i = 0; i < 2; i++) {
+               if (cc[i] < 'A' || cc[i] > 'Z')
+                       return 0;
+       }
+
+       // Looks valid
+       return 1;
+}