/*
 * Copyright (C) by Argonne National Laboratory
 *     See COPYRIGHT in top-level directory
 */

#include "mpi.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

/* many calls are deliberately passed bogus values, are expected to fail, and
 * then checked to see if we get the right error message.  Other
 * calls are expected to succeed but the preciese return string is not checked.  This
 * routine and MPI_CHECK macro handle these unexpected error cases */
static void handle_error(int errcode, const char *str)
{
    char msg[MPI_MAX_ERROR_STRING];
    int resultlen;
    MPI_Error_string(errcode, msg, &resultlen);
    fprintf(stderr, "%s: %s\n", str, msg);
    MPI_Abort(MPI_COMM_WORLD, 1);
}

#define MPI_CHECK(fn) { int errcode; errcode = (fn); if (errcode != MPI_SUCCESS) handle_error(errcode, #fn); }


#define VERBOSE 0
/* tests if error message is printed correctly */

int main(int argc, char **argv)
{
    int i, rank, len, err;
    int errs = 0;
    char *filename, *tmp;
    MPI_File fh;
    char string[MPI_MAX_ERROR_STRING];

    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

#if VERBOSE
    if (!rank) {
        fprintf(stderr, "Tests if errors are reported correctly...\n");
        fprintf(stderr, "Should say \"Invalid displacement argument\"\n\n");
    }
#endif

/* process 0 takes the file name as a command-line argument and
   broadcasts it to other processes */
    if (!rank) {
        i = 1;
        while ((i < argc) && strcmp("-fname", *argv)) {
            i++;
            argv++;
        }
        if (i >= argc) {
            fprintf(stderr, "\n*#  Usage: simple -fname filename\n\n");
            MPI_Abort(MPI_COMM_WORLD, 1);
        }
        argv++;
        len = strlen(*argv);
        filename = (char *) malloc(len + 10);
        strcpy(filename, *argv);
        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
    } else {
        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);
        filename = (char *) malloc(len + 10);
        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);
    }

    /* each process opens a separate file called filename.'myrank' */
    tmp = (char *) malloc(len + 10);
    strcpy(tmp, filename);
    sprintf(filename, "%s.%d", tmp, rank);

    MPI_CHECK(MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE + MPI_MODE_RDWR,
                            MPI_INFO_NULL, &fh));
    err = MPI_File_set_view(fh, -1, MPI_BYTE, MPI_BYTE, "native", MPI_INFO_NULL);
    /* disp is deliberately passed as -1 */

    /* consulting error class should be more general than looking for specific strings */
    if (err != MPI_SUCCESS) {
        if (!rank) {
            int errorclass;
#if VERBOSE
            fprintf(stderr, "%s\n", string);
#else
            /* expecting error class MPI_ERR_ARG */
            MPI_Error_class(err, &errorclass);
            if (errorclass != MPI_ERR_ARG) {
                MPI_Error_string(err, string, &len);
                fprintf(stderr, "Unexpected error message %s\n", string);
                errs++;
            }
#endif
        }
    } else {
        errs++;
        fprintf(stderr, "File set view did not return an error\n");
    }

    MPI_File_close(&fh);

    free(filename);
    free(tmp);

    if (!rank) {
        if (errs == 0) {
            printf(" No Errors\n");
        } else {
            printf(" Found %d errors\n", errs);
        }
    }

    MPI_Finalize();
    return (errs > 0);
}
