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#include <stdlib.h>
#include <unistd.h>
#include <stdarg.h>
extern int execvep(const char *path, char *__const argv[], char *__const envp[]);
int execlp(__const char *file, __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 = execvep(file, (char *const *) argv, __environ);
if (argv != shortargv)
free(argv);
return i;
}
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