source: trunk/essentials/app-shells/bash/examples/loadables/print.c@ 3280

/*
 * print -- loadable ksh-93 style print builtin
 */

#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#include "bashtypes.h"

#include <errno.h>
#include <limits.h>
#include <stdio.h>

#include "bashansi.h"
#include "shell.h"
#include "builtins.h"
#include "stdc.h"
#include "bashgetopt.h"

#if !defined (errno)
extern int errno;
#endif

int print_builtin ();
static int printargs ();

static FILE *ofp;

extern char *this_command_name;

static char *print_doc[] = {
  "Output the arguments.  The -f option means to use the argument as a",
  "format string as would be supplied to printf(1).  The rest of the",
  "options are as in ksh.",
  (char *)NULL
};

struct builtin print_struct = {
        "print",
        print_builtin,
        BUILTIN_ENABLED,
        print_doc,
        "print [-Rnprs] [-u unit] [-f format] [arguments]",
        (char *)0
};

#ifndef ISOPTION
#define ISOPTION(s, c)  (s[0] == '-' && s[2] == '\0' && s[1] == c)
#endif

int
print_builtin (list)
     WORD_LIST *list;
{
  int c, r, nflag, raw, ofd, sflag;
  intmax_t lfd;
  char **v, *pfmt, *arg;
  WORD_LIST *l;

  nflag = raw = sflag = 0;
  ofd = 1;
  pfmt = 0;

  reset_internal_getopt ();
  while ((c = internal_getopt (list, "Rnprsu:f:")) != -1)
    {
      switch (c)
        {
        case 'R':
          raw = 2;
          loptend = lcurrent;
          if (loptend && ISOPTION (loptend->word->word, 'n'))
            {
              loptend = loptend->next;
              nflag = 1;
            }
          goto opt_end;
        case 'r':
          raw = 1;
          break;
        case 'n':
          nflag = 1;
          break;
        case 's':
          sflag = 1;
          break;
        case 'p':
          break;        /* NOP */
        case 'u':
          if (all_digits (list_optarg) && legal_number (list_optarg, &lfd) && lfd == (int)lfd)
            ofd = lfd;
          else
            {
              for (l = list; l->next && l->next != lcurrent; l = l->next);
              lcurrent = loptend = l;
              goto opt_end;
            }
          break;
        case 'f':
          pfmt = list_optarg;
          break;
        default:
          builtin_usage ();
          return (EX_USAGE);
        }
    }

opt_end:
  list = loptend;

  ofp = (ofd == 1) ? stdout : fdopen (dup (ofd), "w");

  if (pfmt)
    {
      WORD_DESC *w;
      WORD_LIST *nlist;

      w = make_word (pfmt);
      nlist = make_word_list (w, list);
      r = printf_builtin (nlist);
      nlist->next = (WORD_LIST *)NULL;
      dispose_words (nlist);
      return (r);
    }

  if (raw)
    {
      for (l = list; l; l = l->next)
        {
          fprintf (ofp, "%s", l->word->word);
          if (l->next)
            fprintf (ofp, " ");
        }
      if (nflag == 0)
        fprintf (ofp, "\n");
      fflush (ofp);
      return (0);       
    }
        
  r = printargs (list, ofp);
  if (r && nflag == 0)
    fprintf (ofp, "\n");
  if (ofd != 1)
    fclose (ofp);
  return 0;
}

static int
printargs (list, ofp)
     WORD_LIST *list;
     FILE *ofp;
{
  WORD_LIST *l;
  char *ostr;
  int sawc;

  for (sawc = 0, l = list; l; l = l->next)
    {
      ostr = ansicstr (l->word->word, strlen (l->word->word), 0, &sawc, (int *)0);
      fprintf (ofp, "%s", ostr);
      free (ostr);
      if (sawc)
        return (0);
      if (l->next)
        fprintf (ofp, " ");
    }
  return (1);
}