libakerror/tests/err_error_names.c

#include "akerror.h"
#include "err_capture.h"
#include <string.h>

/*
 * akerr_init() registers a human-readable name for each library error code.
 * Verify the names are actually installed (mutation testing showed the
 * registration calls could be deleted without any test noticing).
 *
 * This list must stay exhaustive. AKERR_EOF, AKERR_ITERATOR_BREAK and
 * AKERR_NOT_IMPLEMENTED were previously valid codes with no registered name, so
 * they rendered as "Unknown Error" in every stack trace that carried them --
 * the same class of silent gap that a too-small AKERR_MAX_ERR_VALUE used to
 * cause. The sweep below walks the whole AKERR_* offset span so a newly added
 * code without a name fails here rather than showing up in production traces.
 */

static const struct {
    int code;
    const char *name;
} expected[] = {
    { AKERR_NULLPOINTER,        "Null Pointer Error" },
    { AKERR_OUTOFBOUNDS,        "Out Of Bounds Error" },
    { AKERR_API,                "API Error" },
    { AKERR_ATTRIBUTE,          "Attribute Error" },
    { AKERR_TYPE,               "Type Error" },
    { AKERR_KEY,                "Key Error" },
    { AKERR_INDEX,              "Index Error" },
    { AKERR_FORMAT,             "Format Error" },
    { AKERR_IO,                 "Input Output Error" },
    { AKERR_VALUE,              "Value Error" },
    { AKERR_RELATIONSHIP,       "Relationship Error" },
    { AKERR_EOF,                "End Of File" },
    { AKERR_CIRCULAR_REFERENCE, "Circular Reference Error" },
    { AKERR_ITERATOR_BREAK,     "Iterator Break" },
    { AKERR_NOT_IMPLEMENTED,    "Not Implemented" },
    { AKERR_BADEXC,             "Invalid akerr_ErrorContext" },
};

int main(void)
{
    akerr_init();

    for ( unsigned i = 0; i < sizeof(expected) / sizeof(expected[0]); i++ ) {
        char *nm = akerr_name_for_status(expected[i].code, NULL);
        AKERR_CHECK(nm != NULL);
        AKERR_CHECK(strcmp(nm, expected[i].name) == 0);
    }

    /*
     * Every value in the library's own offset span must resolve to a real name.
     * AKERR_LAST_ERRNO_VALUE + 7 is the one deliberate hole (a removed code);
     * anything else nameless is a code someone added without registering it.
     */
    for ( int offset = 1; offset <= AKERR_BADEXC - AKERR_LAST_ERRNO_VALUE; offset++ ) {
        int code = AKERR_LAST_ERRNO_VALUE + offset;
        char *nm = akerr_name_for_status(code, NULL);
        if ( offset == 7 ) {
            AKERR_CHECK(strcmp(nm, "Unknown Error") == 0);
            continue;
        }
        if ( strcmp(nm, "Unknown Error") == 0 || nm[0] == '\0' ) {
            fprintf(stderr, "AKERR_LAST_ERRNO_VALUE + %d (%d) has no name\n",
                    offset, code);
            return 1;
        }
    }

    /* Every AKERR_* code must sit inside the band the library reserves. */
    AKERR_CHECK(AKERR_BADEXC < AKERR_FIRST_CONSUMER_STATUS);

    fprintf(stderr, "err_error_names ok\n");
    return 0;
}