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/* ISC license. */
#include <sys/stat.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <limits.h>
#include <locale.h>
#include <skalibs/bytestr.h>
#include <skalibs/sgetopt.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/env.h>
#include <skalibs/exec.h>
#define USAGE "posix-cd [ -L | -P ] [ - | path ] [ prog... ]"
#define dieusage() strerr_dieusage(100, USAGE)
#define dienomem() strerr_diefu1sys(111, "stralloc_catb")
int main (int argc, char const **argv)
{
int phy = 0 ;
int dopwd = 0 ;
char const *where ;
int got = 0 ;
stralloc sa = STRALLOC_ZERO ;
PROG = "posix-cd" ;
setlocale(LC_ALL, "") ; /* yeah, as if */
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "LP", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'L' : phy = 0 ; break ;
case 'P' : phy = 1 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) where = getenv("HOME") ;
else
{
where = *argv++ ;
if (!strcmp(where, "-"))
{
where = getenv("OLDPWD") ;
dopwd = 1 ;
}
}
if (!where || !where[0]) dieusage() ;
if (!(where[0] == '/' || (where[0] == '.' && (!where[1] || where[1] == '/' || (where[1] == '.' && (!where[2] || where[2] == '/'))))))
{
char const *cdpath = getenv("CDPATH") ;
if (cdpath)
{
size_t pos = 0 ;
size_t len = strlen(cdpath) ;
while (pos < len)
{
struct stat st ;
size_t m = byte_chr(cdpath + pos, len - pos, ':') ;
sa.len = 0 ;
if (m)
{
if (!stralloc_catb(&sa, cdpath + pos, m)) dienomem() ;
if (cdpath[pos + m - 1] != '/' && !stralloc_catb(&sa, "/", 1)) dienomem() ;
}
else if (!stralloc_catb(&sa, "./", 2)) dienomem() ;
if (!stralloc_cats(&sa, where) || !stralloc_0(&sa)) dienomem() ;
if (!stat(sa.s, &st) && S_ISDIR(st.st_mode))
{
got = 1 ;
dopwd = 1 ;
break ;
}
pos += m+1 ;
}
}
}
if (!got && (!stralloc_cats(&sa, where) || !stralloc_0(&sa))) dienomem() ;
{
size_t sabase = sa.len ;
if (sagetcwd(&sa) < 0) strerr_diefu1sys(111, "getcwd") ;
if (!stralloc_0(&sa)) dienomem() ;
if (!env_mexec("OLDPWD", sa.s + sabase)) dienomem() ;
sa.len = sabase ;
}
if (!phy)
{
char const *x = getenv("PWD") ;
if (x && sa.s[0] != '/')
{
size_t len = strlen(x) ;
int doslash = len && x[len-1] != '/' ;
if (!stralloc_insertb(&sa, 0, x, len + doslash)) dienomem() ;
if (doslash) sa.s[len] = '/' ;
}
{
stralloc tmp = STRALLOC_ZERO ;
if (!stralloc_ready(&tmp, sa.len + 2)) dienomem() ;
tmp.len = path_canonicalize(tmp.s, sa.s, 1) ;
if (!tmp.len++)
strerr_diefu4sys(111, "canonicalize ", sa.s, ": problem with ", tmp.s) ;
stralloc_free(&sa) ;
sa = tmp ;
}
if (!env_mexec("PWD", sa.s)) dienomem() ;
#ifdef PATH_MAX
if (sa.len > PATH_MAX && strlen(where) < PATH_MAX && x && *x)
{
size_t len = strlen(x) ;
int hasslash = x[len-1] == '/' ;
if (!strncmp(sa.s, x, len))
{
if (hasslash || (sa.len > len && sa.s[len] == '/'))
{
sa.len -= len + !hasslash ;
memmove(sa.s, sa.s + len + !hasslash, sa.len) ;
}
}
}
#endif
}
/* fking finally */
if (chdir(sa.s) < 0)
strerr_diefu2sys(111, "chdir to ", where) ;
/* and there's still more nonsense to do afterwards! */
if (phy)
{
sa.len = 0 ;
if (sagetcwd(&sa) < 0) strerr_diefu1sys(111, "getcwd") ;
if (!stralloc_0(&sa)) dienomem() ;
if (!env_mexec("PWD", sa.s)) dienomem() ;
}
if (dopwd)
{
sa.s[sa.len - 1] = '\n' ;
if (allwrite(1, sa.s, sa.len) < sa.len)
strerr_diefu1sys(111, "write to stdout") ;
}
xmexec0(argv) ;
}
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