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#include <unistd.h>

#include <stdarg.h>

extern char ** environ;

int execl(path, arg)

const char * path;

const char * arg;

{

        const char *shortargv[16];

        const char **argv;

        const char * c;

        int i;

        va_list args;

        i = 1;

        va_start(args, arg);

        do {

          c = va_arg (args, const char *);

          i++;

        } while (c);

        va_end(args);

        if (i <= 16)

                argv = shortargv;

        else {

                argv = (const char**)malloc(sizeof(char*) * i);

        }

        argv[0] = arg;

        i = 1;

        va_start(args, arg);

        do {

          argv[i] = va_arg (args, const char *);

        } while (argv[i++]);

        va_end(args);

        i = execve(path, argv, environ);

        if (argv != shortargv)

                free(argv);

        return i;

}