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/*
* exec_l.c
*
* Common implementation of execl() execle() execlp()
*/
#include <stdarg.h>
#include <alloca.h>
#include <unistd.h>
int NAME (const char *path, const char *arg0, ...)
{
va_list ap, cap;
int argc = 1, rv;
const char **argv, **argp;
const char *arg;
#if EXEC_E
char * const * envp;
#else
#define envp environ
#endif
va_start(ap, arg0);
va_copy(cap, ap);
/* Count the number of arguments */
do {
arg = va_arg(cap, const char *);
argc++;
} while ( arg );
va_end(cap);
/* Allocate memory for the pointer array */
argp = argv = alloca(argc*sizeof(const char *));
if ( !argv ) {
va_end(ap);
return -1;
}
/* Copy the list into an array */
*argp++ = arg0;
do {
*argp++ = arg = va_arg(ap, const char *);
} while ( arg );
#if EXEC_E
/* execle() takes one more argument for the environment pointer */
envp = va_arg(ap, char * const *);
#endif
rv = (EXEC_P ? execvpe : execve)(path, (char * const *)argv, envp);
va_end(ap);
return rv;
}
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