config.h

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#ifndef _ANN_CONFIG_H_
#define _ANN_CONFIG_H_

#ifndef _GNU_SOURCE
    #define _GNU_SOURCE
#endif

// COMPILER CHECK
#if defined(__clang__)
    #define ANN_INLINE static inline
#elif defined(__GNUC__) || defined(__GNUG__)
    #define ANN_INLINE inline
#elif defined(_MSC_VER)
    #error "msvc not supported"
#endif


// HEADERS CHECK
#define HAVE_STDLIB_H
#define HAVE_STDIO_H
#define HAVE_STDARG_H
#define HAVE_UNISTD_H
#define HAVE_MATH_H
#define HAVE_MALLOC_H
#define HAVE_TIME_H
#define HAVE_SYS_TIME_H
#define HAVE_SYS_TYPES_H
#define HAVE_STRING_H


// FUNCTIONS CHECK

#define HAVE_SRAND
#define HAVE_RAND
#define HAVE_SRAND48
/* #undef HAVE_RAND48 */
#define HAVE_PRINTF
#define HAVE_SPRINTF
#define HAVE_SNPRINTF
#define HAVE_VSNPRINTF
#define HAVE_ASPRINTF
#define HAVE_VASPRINTF
#define HAVE_GRAPHVIZ_GVC_H
#define HAVE_GRAPHVIZ_CGRAPH_H
/* #undef HAVE_GRAPHVIZ_GRAPH_H */

// TYPES CHECK

#define HAVE_SSIZE_T
#define HAVE_SIZE_T

#ifndef HAVE_SIZE_T
    #define size_t unsigned long int
#endif

#ifndef HAVE_SIZE_T
    #define ssize_t signed long int
#endif


#ifdef HAVE_STDLIB_H
    #include <stdlib.h>
#else
    #error "stdlib.h not found"
#endif

#ifdef HAVE_STDIO_H
    #include <stdio.h>
#else
    #error "stdio.h not found"
#endif

#ifdef HAVE_STDARG_H
    #include <stdarg.h>
#else
    #warning "stdarg.h not found"
#endif

#ifdef HAVE_UNISTD_H
    #include <unistd.h>
#else
    #warning "stdio.h not found"
#endif

#ifdef HAVE_MATH_H
    #include <math.h>
#else
    #error "math.h not found"
#endif

#ifdef HAVE_MALLOC_H
    #include <malloc.h>
#else
    #error "malloc.h not found"
#endif

#ifdef HAVE_TIME_H
    #include <time.h>
#elif defined HAVE_SYS_TIME_H
    #include <sys/time.h>
#else
    #warning "time.h not fund"
#endif

#ifdef HAVE_SYS_TYPES_H
    #include <sys/types.h>
#else
    #warning "sys/types.h not found"
#endif

#ifdef HAVE_STRING_H
    #include <string.h>
#else
    #warning "string.h not found"
    size_t strlen(char *s)
    {
        size_t i;
        for(i = 0; s[i] != 0; ++i);
        return i;
    }
#endif

#ifdef HAVE_GRAPHVIZ_GVC_H
    #include <graphviz/gvc.h>
    #if WITH_CGRAPH
        #ifdef HAVE_GRAPHVIZ_CGRAPH_H
            #include <graphviz/cgraph.h>
        #else
            #error "graphviz/cgraph.h not found"
        #endif
    #else
        #ifdef HAVE_GRAPHVIZ_GRAPH_H
            #include <graphviz/graph.h>
        #else
            #error "graphviz/graph.h not found"
        #endif
    #endif
#else
    #error "graphviz/gvc.h not found"
#endif


#ifndef HAVE_SRAND
    #ifdef HAVE_SRAND48
        #define srand srand48
    #else
        #error "srand function undefined"
    #endif
#endif

#ifndef HAVE_RAND
    #ifdef HAVE_RAND48
        #define rand rand48
    #else
        #error "rand function undefined"
    #endif
#endif

#ifndef HAVE_PRINTF
    #error "printf function undefined"
#endif

#ifndef HAVE_SPRINTF
    #error "sprintf function undefined"
#endif

#ifndef HAVE_VSNPRINTF
    #warning "vsnprintf function undefined"
#endif

#ifndef HAVE_SNPRINTF
    #if (defined HAVE_VSNPRINTF) && (defined HAVE_STDARG_H)
        int snprintf (char *s, size_t n, const char *format, ...)
        {
            int result;
            va_list ap;
            va_start (ap, format);
            result = vsnprintf (s, n, format, ap);
            va_end (ap);
            return result;
        }
    #else
        #error "snprintf function undefined"
    #endif

#endif

#ifndef HAVE_VASPRINTF
    #warning "vasprintf function undefined"
#endif

#ifndef HAVE_ASPRINTF
    #if (defined HAVE_VASPRINTF) && (defined HAVE_STDARG_H)
        int asprintf (char **buf, const char *fmt, ...)
        {
            int status;
            va_list ap;
            va_start (ap, fmt);
            status = vasprintf (buf, fmt, ap);
            va_end (ap);
            return status;
        }
    #else
        #error "asprintf function undefined"
    #endif
#endif

#endif /* _ANN_CONFIG_H_ */