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#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <paths.h>
#include <errno.h>
extern char **environ;
static int exec_shell(const char *file, char *const argv[]) {
int i;
for (i = 0; argv[i]; i++);
if (1) {
char *shell_argv[i + 1];
shell_argv[0] = _PATH_BSHELL;
shell_argv[1] = (char *) file;
for (; i > 1; i--)
shell_argv[i] = argv[i - 1];
return execve(_PATH_BSHELL, shell_argv, environ);
}
}
int execvp(const char *file, char *const argv[]) {
char *path=getenv("PATH");
char *cur,*next;
char buf[PATH_MAX];
if (strchr((char*)file,'/')) {
if (execve(file,argv,environ)==-1) {
if (errno==ENOEXEC) exec_shell(file,argv);
return -1;
}
}
if (!path) path=_PATH_DEFPATH;
for (cur=path; cur; cur=next) {
next=strchr(cur,':');
if (!next)
next=cur+strlen(cur);
if (next==cur) {
buf[0]='.';
cur--;
} else
memmove(buf,cur,next-cur);
buf[next-cur]='/';
memmove(&buf[next-cur+1],file,strlen(file)+1);
if (execve(buf,argv,environ)==-1) {
if (errno==ENOEXEC) return exec_shell(buf,argv);
if ((errno!=EACCES) && (errno!=ENOENT)) return -1;
}
if (*next==0) break;
next++;
}
return -1;
}
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