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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;
}
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