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astquery.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2008 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>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * AT&T Research
 *
 * output printf prompt and read response
 * if format==0 then verify that interaction is possible
 *
 * return:
 *
 *    0     [1yY+]
 *    -1    [qQ] or EOF
 *    1     otherwise
 *
 * if (quit&ERROR_PROMPT) then tty forced for IO
 * if quit>=0 then [qQ] or EOF calls exit(quit)
 */

#include <ast.h>
#include <error.h>

int
astquery(int quit, const char* format, ...)
{
      va_list           ap;
      register int      n;
      register int      c;
      Sfio_t*           ip;
      Sfio_t*           op;

      static Sfio_t*    rfp;
      static Sfio_t*    wfp;

      va_start(ap, format);
      if (!format)
            return 0;
      if (!rfp)
      {
            c = errno;
            if (isatty(sffileno(sfstdin)))
                  rfp = sfstdin;
            else if (!(rfp = sfopen(NiL, "/dev/tty", "r")))
                  return -1;
            if (isatty(sffileno(sfstderr)))
                  wfp = sfstderr;
            else if (!(wfp = sfopen(NiL, "/dev/tty", "w")))
                  return -1;
            errno = c;
      }
      if (quit & ERROR_PROMPT)
      {
            quit &= ~ERROR_PROMPT;
            ip = rfp;
            op = wfp;
      }
      else
      {
            ip = sfstdin;
            op = sfstderr;
      }
      sfsync(sfstdout);
      sfvprintf(op, format, ap);
      sfsync(op);
      for (n = c = sfgetc(ip);; c = sfgetc(ip))
            switch (c)
            {
            case EOF:
                  n = c;
                  /*FALLTHROUGH*/
            case '\n':
                  switch (n)
                  {
                  case EOF:
                  case 'q':
                  case 'Q':
                        if (quit >= 0)
                              exit(quit);
                        return -1;
                  case '1':
                  case 'y':
                  case 'Y':
                  case '+':
                        return 0;
                  }
                  return 1;
            }
      va_end(ap);
      /*NOTREACHED*/
}

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