/* $Header$
 *
 * This generates the network table.
 *
 *  (c) Copyright 1994 by the Massachusetts Institute of Technology.
 *  For copying and distribution information, please see the file
 *  <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <stdio.h>
#include <moira.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>

EXEC SQL INCLUDE sqlca;

extern int errno;
char *whoami = "network.gen";


main(argc, argv)
int argc;
char **argv;
{
    FILE *out = stdout;
    char *outf = NULL, outft[64], *p, buf[256];
    struct stat sb;
    struct timeval now;
    int flag1, i;
    EXEC SQL BEGIN DECLARE SECTION;
    int id, addr;
    char name[65], description[65];
    EXEC SQL END DECLARE SECTION;

#ifsql INGRES
    EXEC SQL CONNECT moira;
    EXEC SQL SET LOCKMODE SESSION WHERE LEVEL=TABLE, READLOCK=SHARED;
#endsql
#ifsql INFORMIX
    EXEC SQL DATABASE moira;
#endsql

    if (argc == 2) { 
	if (stat(argv[1], &sb) == 0) { 
	    if (ModDiff(&flag1, "subnet", sb.st_mtime))
	      exit(MR_DATE);
	    if (flag1 < 0) {
		fprintf(stderr, "File %s does not need to be rebuilt.\n",
			argv[1]);
		exit(MR_NO_CHANGE);
	    } 
	}
	outf = argv[1];
	sprintf(outft, "%s~", outf);
	if ((out = fopen(outft, "w")) == NULL) {
	    fprintf(stderr, "unable to open %s for output\n", outf);
	    exit(MR_OCONFIG);
	}
    } else if (argc != 1) {
	fprintf(stderr, "usage: %s [outfile]\n", argv[0]);
	exit(MR_ARGS);
    } else {
	outf = NULL;
    }

    EXEC SQL WHENEVER SQLERROR GOTO sqlerr;

    gettimeofday(&now, NULL);
    
    fprintf(out, "; MIT Network Table\n;\n");
    fprintf(out, "; \t%cAuthor: $\n", '$');
    fprintf(out, "; \t%cDate: $\n", '$');
    fprintf(out, "; \t%cRevision: $\n;\n", '$');
    fprintf(out, "; Network table generated by Moira at %s;\n",
	    ctime(&now.tv_sec));

    EXEC SQL DECLARE x CURSOR FOR SELECT 
      name, snet_id, saddr, description
      FROM subnet ORDER BY saddr;
    EXEC SQL OPEN x;
    while (1) {
	EXEC SQL FETCH x INTO :name, :id, :addr, :description;
	if (sqlca.sqlcode != 0) break;
	if (id == 0) continue;
	if (*strtrim(name) == 0) continue;
	fprintf(out, "NETWORK : %-16.16s : %-13.13s : %s \n", name, inet_ntoa(htonl(addr)), 
	   description);
    }

    EXEC SQL CLOSE x;
#ifsql INGRES
    EXEC SQL DISCONNECT;
#endsql
#ifsql INFORMIX
    EXEC SQL CLOSE DATABASE;
#endsql

    fprintf(out, "; End of automatically generated network table\n");
    if (fclose(out)) {
	perror("close failed");
	exit(MR_CCONFIG);
    }
    if (outf)
      fix_file(outf);
    exit(MR_SUCCESS);

 sqlerr:
    com_err(whoami, MR_INGRES_ERR, " code %d\n", sqlca.sqlcode);
#ifsql INGRES
    if (sqlca.sqlcode == 17700 || sqlca.sqlcode == -37000)
      exit(MR_DEADLOCK);
#endsql
    critical_alert("DCM", "Networks build encountered INGRES ERROR %d",
		   sqlca.sqlcode);
    exit(MR_INGRES_ERR);
}