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dirname.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1992-2010 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * David Korn
 * AT&T Bell Laboratories
 *
 * dirname path [suffix]
 *
 * print the dirname of a pathname
 */

static const char usage[] =
"[-?\n@(#)$Id: dirname (AT&T Research) 2009-01-31 $\n]"
USAGE_LICENSE
"[+NAME?dirname - return directory portion of file name]"
"[+DESCRIPTION?\bdirname\b treats \astring\a as a file name and returns "
      "the name of the directory containing the file name by deleting "
      "the last component from \astring\a.]"
"[+?If \astring\a consists solely of \b/\b characters the output will "
      "be a single \b/\b unless \bPATH_LEADING_SLASHES\b returned by "
      "\bgetconf\b(1) is \b1\b and \astring\a consists of multiple "
      "\b/\b characters in which case \b//\b will be output.  "
      "Otherwise, trailing \b/\b characters are removed, and if "
      "there are no remaining \b/\b characters in \astring\a, "
      "the string \b.\b will be written to standard output.  "
      "Otherwise, all characters following the last \b/\b are removed. "
      "If the remaining string consists solely of \b/\b characters, "
      "the output will be as if the original string had consisted solely "
      "as \b/\b characters as described above.  Otherwise, all "
      "trailing slashes are removed and the output will be this string "
      "unless this string is empty.  If empty the output will be \b.\b.]" 
"[f:file?Print the \b$PATH\b relative regular file path for \astring\a.]"
"[r:relative?Print the \b$PATH\b relative readable file path for \astring\a.]"
"[x:executable?Print the \b$PATH\b relative executable file path for \astring\a.]"
"\n"
"\nstring\n"
"\n"
"[+EXIT STATUS?]{"
        "[+0?Successful Completion.]"
        "[+>0?An error occurred.]"
"}"
"[+SEE ALSO?\bbasename\b(1), \bgetconf\b(1), \bdirname\b(3), \bpathname\b(3)]"
;

#include <cmd.h>

static void l_dirname(register Sfio_t *outfile, register const char *pathname)
{
      register const char  *last;
      /* go to end of path */
      for(last=pathname; *last; last++);
      /* back over trailing '/' */
      while(last>pathname && *--last=='/');
      /* back over non-slash chars */
      for(;last>pathname && *last!='/';last--);
      if(last==pathname)
      {
            /* all '/' or "" */
            if(*pathname!='/')
                  last = pathname = ".";
      }
      else
      {
            /* back over trailing '/' */
            for(;*last=='/' && last > pathname; last--);
      }
      /* preserve // */
      if(last!=pathname && pathname[0]=='/' && pathname[1]=='/')
      {
            while(pathname[2]=='/' && pathname<last)
                  pathname++;
            if(last!=pathname && pathname[0]=='/' && pathname[1]=='/' && *astconf("PATH_LEADING_SLASHES",NiL,NiL)!='1')
                  pathname++;
      }
      sfwrite(outfile,pathname,last+1-pathname);
      sfputc(outfile,'\n');
}

int
b_dirname(int argc,register char *argv[], void* context)
{
      register int n;
      int mode = 0;
      char buf[PATH_MAX];

      cmdinit(argc, argv, context, ERROR_CATALOG, 0);
      while (n = optget(argv, usage)) switch (n)
      {
      case 'f':
            mode |= PATH_REGULAR;
            break;
      case 'r':
            mode &= ~PATH_REGULAR;
            mode |= PATH_READ;
            break;
      case 'x':
            mode |= PATH_EXECUTE;
            break;
      case ':':
            error(2, "%s", opt_info.arg);
            break;
      case '?':
            error(ERROR_usage(2), "%s", opt_info.arg);
            break;
      }
      argv += opt_info.index;
      argc -= opt_info.index;
      if(error_info.errors || argc != 1)
            error(ERROR_usage(2),"%s", optusage(NiL));
      if(!mode)
            l_dirname(sfstdout,argv[0]);
      else if(pathpath(buf, argv[0], "", mode))
            sfputr(sfstdout, buf, '\n');
      else
            error(1|ERROR_WARNING, "%s: relative path not found", argv[0]);
      return(0);
}

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