GRASS 8 Programmer's Manual 8.6.0dev(2026)-f6f2c534ea
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overwrite.c
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1/*!
2 * \file lib/gis/overwrite.c
3 *
4 * \brief GIS Library - Check for overwrite.
5 *
6 * (C) 2001-2008, 2010 by the GRASS Development Team
7 *
8 * This program is free software under the GNU General Public License
9 * (>=v2). Read the file COPYING that comes with GRASS for details.
10 *
11 * \author GRASS Development Team, Martin Landa <landa.martin gmail.com>
12 */
13
14#include <stdlib.h>
15#include <string.h>
16#include <grass/gis.h>
17
18/*!
19 * \brief Check for overwrite mode
20 *
21 * Check variables OVERWRITE, GRASS_OVERWRITE and '--o' flag.
22 *
23 * The parser G_parser() checks if the map already exists in current mapset,
24 * we can switch out the check and do it
25 * in the module after the parser.
26 *
27 * \param argc number of arguments
28 * \param argv array of arguments
29 *
30 * \return 1 if overwrite
31 * \return 0 if not overwrite
32 */
33int G_check_overwrite(int argc, char **argv)
34{
35 const char *overstr;
36 int overwrite;
37
38 overwrite = 0;
39 if ((overstr = G_getenv_nofatal("OVERWRITE"))) {
40 overwrite = atoi(overstr);
41 }
42
43 /* check if inherited GRASS_OVERWRITE is 1 */
44 if (!overwrite && (overstr = getenv("GRASS_OVERWRITE"))) {
45 overwrite = atoi(overstr);
46 }
47
48 /* check for --o or --overwrite option */
49 if (!overwrite) {
50 int i;
51
52 for (i = 0; i < argc; i++) {
53 if (strcmp(argv[i], "--o") == 0 ||
54 strcmp(argv[i], "--overwrite") == 0) {
55 overwrite = 1;
56 break;
57 }
58 }
59 }
60
61 G_setenv_nogisrc("OVERWRITE", "1");
62
63 return overwrite;
64}
const char * G_getenv_nofatal(const char *)
Get environment variable.
Definition env.c:405
void G_setenv_nogisrc(const char *, const char *)
Set environment name to value (doesn't update .gisrc)
Definition env.c:472
int G_check_overwrite(int argc, char **argv)
Check for overwrite mode.
Definition overwrite.c:33