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/*
* prompt.cc: Part of GNU CSSC.
*
* Copyright (C) 1997,1998,2007,2008 Free Software Foundation, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* CSSC was originally Based on MySC, by Ross Ridge, which was
* placed in the Public Domain.
*
*
* Defines the function prompt_user.
*
*/
#include "cssc.h"
#ifdef CONFIG_SCCS_IDS
static const char rcs_id[] = "CSSC $Id: prompt.cc,v 1.15 2008/01/06 19:42:23 jay Exp $";
#endif
static char *
re_new(char *p, int oldlen, int newlen)
{
char *q = new char[newlen];
if (q)
{
memcpy(q, p, oldlen);
}
delete[] p;
return q;
}
/* Prompts the user for input. */
mystring
prompt_user(const char *prompt)
{
const int chunk_size = 16;
int buflen = 4; // Ensure we resize at least once for test coverage.
char *linebuf = new char [buflen];
int c, lastc;
int i = 0;
// Issue the prompt only if stdin is a tty.
if (stdin_is_a_tty())
{
fputs(prompt, stdout);
fflush(stdout);
}
lastc = 0;
while ( (c=getchar()) != EOF )
{
if ('\n' == c)
{
if (lastc == '\\')
--i; /* Overwrite the backslash with the escaped newline */
else
break;
}
if (i == buflen - 1)
{
linebuf = re_new(linebuf, buflen, buflen+chunk_size);
buflen += chunk_size;
}
linebuf[i++] = c;
lastc = c;
}
linebuf[i] = '\0';
mystring ret(linebuf);
delete[] linebuf;
return ret;
}
/* Local variables: */
/* mode: c++ */
/* End: */
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