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/*
* =========================================================================
* unblock_dem - A program to add newlines to a USGS DEM file.
* Copyright (c) 2000 Fred M. Erickson
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
* =========================================================================
*
* This program unblocks the information in a DEM file
* by adding a newline to each record.
* It sets the last byte in each record (which should always be
* a blank) to a newline.
*
* The program reads from stdin and writes to stdout.
*/
#include <stdio.h>
#include <sys/types.h>
#include "drawmap.h"
#include "dem.h"
void
license(void)
{
fprintf(stderr, "This program is free software; you can redistribute it and/or modify\n");
fprintf(stderr, "it under the terms of the GNU General Public License as published by\n");
fprintf(stderr, "the Free Software Foundation; either version 2, or (at your option)\n");
fprintf(stderr, "any later version.\n\n");
fprintf(stderr, "This program is distributed in the hope that it will be useful,\n");
fprintf(stderr, "but WITHOUT ANY WARRANTY; without even the implied warranty of\n");
fprintf(stderr, "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n");
fprintf(stderr, "GNU General Public License for more details.\n\n");
fprintf(stderr, "You should have received a copy of the GNU General Public License\n");
fprintf(stderr, "along with this program; if not, write to the Free Software\n");
fprintf(stderr, "Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.\n");
}
main(int argc, char *argv[])
{
unsigned char buf[DEM_RECORD_LENGTH];
int start_flag = 0;
int ret_val;
int i;
if ((argc == 2) && (argv[1][0] == '-') && (argv[1][1] == 'L')) {
license();
exit(0);
}
else if (argc != 1) {
fprintf(stderr, "Usage: %s < dem_file\n", argv[0]);
exit(0);
}
while ((ret_val = read(0, buf, DEM_RECORD_LENGTH)) == DEM_RECORD_LENGTH) {
if (start_flag == 0) {
/*
* Check for newlines in the first read
* to try to prevent people from converting files
* that already have newlines in them.
*/
for (i = 0; i < DEM_RECORD_LENGTH; i++) {
if (buf[i] == '\n') {
fprintf(stderr, "This file already has newlines in it. Aborting.\n");
exit(0);
}
}
start_flag = 1;
}
if (buf[DEM_RECORD_LENGTH - 1] != ' ') {
/*
* In my experience, no optional-format DEM file has non-white-space
* in the last byte of a record. Don't do the conversion if there
* is actual data there.
*/
fprintf(stderr, "This file may have formatting problems. Aborting.\n");
exit(0);
}
buf[DEM_RECORD_LENGTH - 1] = '\n';
write(1, buf, ret_val);
}
if ((ret_val != 0) && (ret_val != DEM_RECORD_LENGTH)) {
fprintf(stderr, "read() returned %d\n", ret_val);
exit(0);
}
}
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