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#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "exec_lib.h"
#include "dietfeatures.h"
int execvp(const char *file, char *const argv[]) {
const 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=(char*)path; cur; cur=next) {
next=strchr(cur,':');
if (!next)
next=cur+strlen(cur);
if (next==cur) {
buf[0]='.';
cur--;
} else {
if (next-cur>=PATH_MAX-3) { error: errno=EINVAL; return -1; }
memmove(buf,cur,(size_t)(next-cur));
}
buf[next-cur]='/';
{
int len=strlen(file);
if (len+(next-cur)>=PATH_MAX-2) goto error;
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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