overwrite.c

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#include <stdlib.h>
#include <string.h>
#include <grass/gis.h>

int G_check_overwrite(int argc, char **argv)
{
    char *overstr;
    int overwrite;

    overwrite = 0;
    if ((overstr = G__getenv("OVERWRITE"))) {
        overwrite = atoi(overstr);
    }

    /* check if inherited GRASS_OVERWRITE is 1 */
    if (!overwrite && (overstr = getenv("GRASS_OVERWRITE"))) {
        overwrite = atoi(overstr);
    }

    /* check for --o or --overwrite option */
    if (!overwrite) {
        int i;

        for (i = 0; i < argc; i++) {
            if (strcmp(argv[i], "--o") == 0 ||
                strcmp(argv[i], "--overwrite") == 0) {
                overwrite = 1;
                break;
            }
        }
    }

    G__setenv("OVERWRITE", "1");

    return overwrite;
}