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#include <sys/unistd.h>

#include <errno.h>

extern char **environ;

int

execv (const char *path, char * const *args) {

        extern int execve (const char *, char * const *, char * const*);

        return execve (path, args, environ);

}

int

execl(const char *path, const char *arg1, ...) {

        return execv (path, &arg1);

}

/*

 * Copy string, until c or <nul> is encountered.

 * NUL-terminate the destination string (s1).

 */

static char *

strccpy (char *s1, char *s2, char c) {

        char *dest = s1;

        while (*s2 && *s2 != c) {

                *s1++ = *s2++;

        }

        *s1 = 0;

        return dest;

}

int

execvp(const char *file, char * const *args) {

        extern char *getenv (const char *);

        char *path = getenv ("PATH");

        char buf[MAXNAMLEN];

        if (file[0] == '/') {    /* absolute pathname -- easy out */

                return execv (file, args);

        }

        buf[0] = 0;       /* lots of initialization here 8-) */

        while (*path) {

                strccpy (buf, path, ':');

                strcat (buf, "/");

                strcat (buf, file);

                execv (buf, args);

                if (errno != ENOENT)

                        return -1;

                while (*path && *path != ':')

                        path++;

        }

        return -1;

}