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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <stdio.h>
#include <ctype.h>
#define import_spp
#define import_kernel
#define import_knames
#include <iraf.h>
/* ZFSUBD -- Fold a subdirectory into an OS directory. If osdir is null the
* current directory is assumed. If subdir is null osdir is modified as
* necessary to make it a legal directory prefix, e.g., if osdir = "/usr/iraf"
* and subdir = "", we would return osdir = "/usr/iraf/". The subdirectory
* "." refers to the current directory and ".." to the previous directory,
* but this is consistent with UNIX so we need not recognize these as special
* cases. The return OS directory prefix need not be an absolute pathname.
*/
int
ZFSUBD (
XCHAR *osdir, /* pathname [NOT PACKED] */
XINT *maxch, /* max xchars in osdir */
XCHAR *subdir, /* subdirectory name [NOT PACKED] */
XINT *nchars /* receives lenght of osdir */
)
{
register XCHAR *ip, *op;
register int n;
PKCHAR cwd[SZ_PATHNAME+1];
XINT x_maxch = SZ_PATHNAME;
XCHAR *slash;
char *cp;
extern int ZFGCWD();
/* If osdir is null, use the current directory.
*/
if (osdir[0] == XEOS) {
ZFGCWD (cwd, &x_maxch, nchars);
if (*nchars == XERR)
return (XERR);
n = *maxch;
for (cp=(char *)cwd, op=osdir; --n >= 0 && (*op = *cp++); op++)
;
*op = XEOS;
}
/* Find the end of the OSDIR string and the index of the / preceeding
* the last directory name, e.g., if "a/b/", slash=2.
*/
slash = NULL;
for (op=osdir; *op != XEOS; op++)
if (*op == '/' && *(op+1) != XEOS)
slash = op;
/* Make sure the OSDIR ends with a '/'.
*/
if (op > osdir && *(op-1) != '/')
*op++ = '/';
n = *maxch - (op - osdir);
/* Concatenate the subdirectory. The "subdirectories "." or ".." are
* special cases.
*/
for (ip=subdir; *ip == ' '; ip++)
;
if (*ip == '.') {
switch (*(ip+1)) {
case '.':
if (*(ip+2) == XEOS && slash != NULL && *(slash+1) != '.') {
op = slash + 1;
n = *maxch - (op - osdir);
} else
goto subdir_;
break;
case EOS:
break;
default:
goto subdir_;
}
} else {
subdir_: while (--n >= 0 && (*op = *ip++) != XEOS)
op++;
}
/* If OSDIR is the null string return the pathname of the current
* working directory, i.e., "./".
*/
if (op == osdir && --n >= 0)
*op++ = '.';
/* Make sure the OSDIR ends with a '/'
*/
if (*(op-1) != '/' && --n >= 0)
*op++ = '/';
*op = XEOS;
*nchars = op - osdir;
return (XOK);
}
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