#include <stdint.h>
#include <string.h>
#include <stdbool.h>
#include <fcntl.h>
#include <errno.h>

#include "common_utils/utils.h"

char *append(char *buf, const char *appended, size_t *pcap)
{
    char c;
    char *buf0 = buf;
    size_t cap = *pcap;

    if (buf0 == NULL) return NULL;
    if (appended == NULL || appended[0] == 0) return buf0;

    while (cap > 1 && 0 != (c = *appended++)) {
        *buf++ = c;
        cap--;
    }
    if (cap == 0) {
        *buf0 = '\0';
        return NULL;
    }

    *pcap = cap;
    *buf = 0;
    return buf;
}

bool fd_is_valid(int fd)
{
    return fcntl(fd, F_GETFD) != -1 || errno != EBADF;
}

int parse_boolean_arg(const char *str)
{
    if (0 == strcasecmp(str, "on")) return 1;
    if (strstarts(str, "en")) return 1;
    if (strstarts(str, "y")) return 1;
    if (0 == strcmp(str, "1")) return 1;
    if (0 == strcasecmp(str, "a")) return 1;

    if (0 == strcasecmp(str, "off")) return 0;
    if (0 == strcmp(str, "0")) return 0;
    if (strstarts(str, "dis")) return 0;
    if (strstarts(str, "n")) return 0;

    return -1;
}