compat.h

#ifndef COMPAT_H
#define COMPAT_H

#define _GNU_SOURCE

/* ISO C */
#include <assert.h>
#include <complex.h>
#include <ctype.h>
#include <errno.h>
#include <fenv.h>
#include <float.h>
#include <inttypes.h>
#include <iso646.h>
#include <limits.h>
#include <locale.h>
#include <math.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <tgmath.h>
#include <time.h>
#include <wchar.h>
#include <wctype.h>

#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <arpa/inet.h>
#include <sys/queue.h>
#include <netinet/tcp.h>
#include <netinet/in.h>

#define ARRAY_SIZE(x)      (sizeof(x) / sizeof(x[1]))
#define COMPILER_ASSERT(X) (void)sizeof(char[(X) ? 1 : -1])

/* Test for backtrace() */
#if defined(__APPLE__) || (defined(__linux__) && defined(__GLIBC__))
#define HAVE_BACKTRACE 1
#endif

#if defined(__linux__) || defined(__OpenBSD__)
#define _XOPEN_SOURCE 700
/*
 *  * On NetBSD, _XOPEN_SOURCE undefines _NETBSD_SOURCE and
 *   * thus hides inet_aton etc.
 *    */
#elif !defined(__NetBSD__)
#define _XOPEN_SOURCE
#endif

// It converts <x>[dhms] to seconds.
// If format is invalid, or x is not a positive integer, returns -1.
static inline int
seconds_from_string(char *s, int *seconds)
{
    int x   = 0;
    char *p = s;
    int mul = 24 * 3600;
    while (*p != '\0') {
        if (isdigit(*p)) {
            p++;
            continue;
        } else {
            if (*p == 'd') {
                mul = 24 * 3600;
                break;
            } else if (*p == 'h') {
                mul = 3600;
                break;
            } else if (*p == 'm') {
                mul = 60;
                break;
            } else if (*p == 's') {
                mul = 1;
                break;
            } else {
                return -1;
            }
        }
    }
    // *p or *(p+1) should be '\0'.
    if (*p != '\0' && *(p + 1) != '\0') {
        return -2;
    }
    errno = 0;
    x     = strtol(s, NULL, 10);
    if (errno != 0) {
        return -3;
    }
    *seconds = x * mul;
    return 0;
}

#endif