libpq_uri_regress.c

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/*
 * libpq_uri_regress.c
 *      A test program for libpq URI format
 *
 * This is a helper for libpq conninfo regression testing.  It takes a single
 * conninfo string as a parameter, parses it using PQconninfoParse, and then
 * prints out the values from the parsed PQconninfoOption struct that differ
 * from the defaults (obtained from PQconndefaults).
 *
 * Portions Copyright (c) 2012-2026, PostgreSQL Global Development Group
 *
 * IDENTIFICATION
 *      src/interfaces/libpq/test/libpq_uri_regress.c
 */
 
#include "postgres_fe.h"
 
#include "libpq-fe.h"
 
int
main(int argc, char *argv[])
{
    PQconninfoOption *opts;
    PQconninfoOption *defs;
    PQconninfoOption *opt;
    PQconninfoOption *def;
    char       *errmsg = NULL;
    bool        local = true;
 
    if (argc != 2)
        return 1;
 
    opts = PQconninfoParse(argv[1], &errmsg);
    if (opts == NULL)
    {
        fprintf(stderr, "libpq_uri_regress: %s", errmsg);
        return 1;
    }
 
    defs = PQconndefaults();
    if (defs == NULL)
    {
        fprintf(stderr, "libpq_uri_regress: cannot fetch default options\n");
        return 1;
    }
 
    /*
     * Loop on the options, and print the value of each if not the default.
     *
     * XXX this coding assumes that PQconninfoOption structs always have the
     * keywords in the same order.
     */
    for (opt = opts, def = defs; opt->keyword; ++opt, ++def)
    {
        if (opt->val != NULL)
        {
            if (def->val == NULL || strcmp(opt->val, def->val) != 0)
                printf("%s='%s' ", opt->keyword, opt->val);
 
            /*
             * Try to detect if this is a Unix-domain socket or inet.  This is
             * a bit grotty but it's the same thing that libpq itself does.
             *
             * Note that we directly test for '/' instead of using
             * is_absolute_path, as that would be considerably more messy.
             * This would fail on Windows, but that platform doesn't have
             * Unix-domain sockets anyway.
             */
            if (*opt->val &&
                (strcmp(opt->keyword, "hostaddr") == 0 ||
                 (strcmp(opt->keyword, "host") == 0 && *opt->val != '/')))
            {
                local = false;
            }
        }
    }
 
    if (local)
        printf("(local)\n");
    else
        printf("(inet)\n");
 
    return 0;
}