API: Allow setting code table keys as missing via codes_set_string

examples/C/grib_set_missing.c

@@ -62,6 +62,8 @@ int main(int argc, char** argv)
     /* Can also set to MISSING via codes_set_string */
     CODES_CHECK(codes_set_string(h, "scaleFactorOfFirstFixedSurface", "missing", &str_len), 0);
     CODES_CHECK(codes_set_string(h, "scaledValueOfFirstFixedSurface", "missing", &str_len), 0);
+    /* Set a Code Table key to missing via codes_set_string */
+    CODES_CHECK(codes_set_string(h, "typeOfFirstFixedSurface", "missing", &str_len), 0);
 
     /* see GRIB-490 */
     CODES_CHECK(codes_get_long(h, "Ni", &Ni), 0);

examples/C/grib_set_missing.sh

@@ -20,6 +20,10 @@ if [ -f "${tools_dir}/grib_get" ]; then
     [ "$sf" = "MISSING" ]
     sf=`${tools_dir}/grib_get -p scaledValueOfFirstFixedSurface $tempGrib`
     [ "$sf" = "MISSING" ]
+
+    # Code Table key being set to missing
+    sf=`${tools_dir}/grib_get -p typeOfFirstFixedSurface:i, $tempGrib`
+    [ "$sf" = "255" ]
 fi
 
 rm -f $tempGrib

src/grib_accessor_class_codetable.cc

@@ -737,6 +737,10 @@ static int pack_string(grib_accessor* a, const char* buffer, size_t* len)
         return grib_pack_long(a, &lValue, &l);
     }
 
+    if (STR_EQUAL_NOCASE(buffer, "missing")) {
+        return pack_missing(a);
+    }
+
     grib_accessor_codetable* self = (grib_accessor_codetable*)a;
     grib_codetable* table;
     long i;

src/grib_accessor_class_long.cc

@@ -258,7 +258,7 @@ static int pack_string(grib_accessor* a, const char* val, size_t* len)
     long v = 0; /* The converted value */
 
     // ECC-1722
-    if (strcmp_nocase(val, "missing")==0) {
+    if (STR_EQUAL_NOCASE(val, "missing")) {
         return pack_missing(a);
     }
 

src/grib_api_internal.h

@@ -201,6 +201,8 @@ extern int pthread_mutexattr_settype(pthread_mutexattr_t* attr, int type);
 
 /* Return true if two strings are equal */
 #define STR_EQUAL(a, b) (strcmp((a), (b)) == 0)
+/* Return true if two strings are equal, ignoring case */
+#define STR_EQUAL_NOCASE(a, b) (strcmp_nocase((a), (b)) == 0)
 
 #include "grib_api.h"