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/* ISC license. */
#include <unistd.h>
#include <errno.h>
#include <skalibs/bytestr.h>
#include <skalibs/djbunix.h>
void execvep (char const *file, char const *const *argv, char const *const *envp, char const *path)
{
if (!path) errno = EINVAL ;
else if (file[str_chr(file, '/')])
execve(file, (char *const *)argv, (char *const *)envp) ; /* execve prototype sucks */
else
{
unsigned int pathlen = str_len(path) + 1 ;
unsigned int filelen = str_len(file) ;
int savederrno = 0 ;
while (pathlen)
{
unsigned int split = byte_chr(path, pathlen - 1, ':') ;
if (split)
{
char tmp[split + 2 + filelen] ;
byte_copy(tmp, split, path) ;
tmp[split] = '/' ;
byte_copy(tmp + split + 1, filelen + 1, file) ;
execve(tmp, (char *const *)argv, (char *const *)envp) ;
if (errno != ENOENT)
{
savederrno = errno ;
if ((errno != EACCES) && (errno != EPERM) && (errno != EISDIR)) break ;
}
}
path += split+1 ; pathlen -= split+1 ;
}
if (savederrno) errno = savederrno ;
}
}
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