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/*
* $Id: prgbox.c,v 1.9 2012/12/02 23:40:30 tom Exp $
*
* prgbox.c -- implements the prg box
*
* Copyright 2011,2012 Thomas E. Dickey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License, version 2.1
* as published by the Free Software Foundation.
*
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to
* Free Software Foundation, Inc.
* 51 Franklin St., Fifth Floor
* Boston, MA 02110, USA.
*/
#include <dialog.h>
static void
reapchild(int sig)
{
(void) sig;
}
/*
* Open a pipe which ties stderr and stdout together.
*/
static FILE *
dlg_popen(const char *command, const char *type)
{
FILE *result = 0;
int fd[2];
char *blob;
char **argv;
if ((*type == 'r' || *type != 'w') && pipe(fd) == 0) {
switch (fork()) {
case -1: /* Error. */
(void) close(fd[0]);
(void) close(fd[1]);
break;
case 0: /* child. */
if (*type == 'r') {
if (fd[1] != STDOUT_FILENO) {
(void) dup2(fd[1], STDOUT_FILENO);
(void) close(fd[1]);
}
(void) dup2(STDOUT_FILENO, STDERR_FILENO);
(void) close(fd[0]);
} else {
if (fd[0] != STDIN_FILENO) {
(void) dup2(fd[0], STDIN_FILENO);
(void) close(fd[0]);
}
(void) close(fd[1]);
(void) close(STDERR_FILENO);
}
/*
* Bourne shell needs "-c" option to force it to use only the
* given command. Also, it needs the command to be parsed into
* tokens.
*/
if ((blob = malloc(4 + strlen(command))) != 0) {
sprintf(blob, "-c %s", command);
argv = dlg_string_to_argv(blob);
execvp("sh", argv);
}
_exit(127);
/* NOTREACHED */
default: /* parent */
if (*type == 'r') {
result = fdopen(fd[0], type);
(void) close(fd[1]);
} else {
result = fdopen(fd[1], type);
(void) close(fd[0]);
}
break;
}
}
return result;
}
/*
* Display text from a pipe in a scrolling window.
*/
int
dialog_prgbox(const char *title,
const char *cprompt,
const char *command,
int height,
int width,
int pauseopt)
{
int code;
FILE *fp;
void (*oldreaper) (int) = signal(SIGCHLD, reapchild);
fp = dlg_popen(command, "r");
if (fp == NULL)
dlg_exiterr("pipe open failed: %s", command);
code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp);
pclose(fp);
signal(SIGCHLD, oldreaper);
return code;
}
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