key_value4.c

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

int G_update_key_value_file(const char *file, const char *key,
                            const char *value)
{
    struct Key_Value *kv;
    int stat;

    kv = G_read_key_value_file(file, &stat);
    if (stat != 0)
        return stat;

    if (!G_set_key_value(key, value, kv)) {
        G_free_key_value(kv);
        return -2;
    }

    G_write_key_value_file(file, kv, &stat);
    G_free_key_value(kv);

    return stat;
}

int G_lookup_key_value_from_file(const char *file,
                                 const char *key, char value[], int n)
{
    struct Key_Value *kv;
    int stat;
    char *v;

    *value = 0;
    kv = G_read_key_value_file(file, &stat);
    if (stat != 0)
        return stat;

    v = G_find_key_value(key, kv);
    if (v) {
        strncpy(value, v, n);
        value[n - 1] = 0;
        stat = 1;
    }
    else
        stat = 0;
    G_free_key_value(kv);
    return stat;
}