1/*
2 *  $Id: prgbox.c,v 1.13 2016/01/27 01:37:26 tom Exp $
3 *
4 *  prgbox.c -- implements the prg box
5 *
6 *  Copyright 2011-2014,2016	Thomas E. Dickey
7 *
8 *  This program is free software; you can redistribute it and/or modify
9 *  it under the terms of the GNU Lesser General Public License, version 2.1
10 *  as published by the Free Software Foundation.
11 *
12 *  This program is distributed in the hope that it will be useful, but
13 *  WITHOUT ANY WARRANTY; without even the implied warranty of
14 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 *  Lesser General Public License for more details.
16 *
17 *  You should have received a copy of the GNU Lesser General Public
18 *  License along with this program; if not, write to
19 *	Free Software Foundation, Inc.
20 *	51 Franklin St., Fifth Floor
21 *	Boston, MA 02110, USA.
22 */
23
24#include <dialog.h>
25
26static void
27reapchild(int sig)
28{
29    (void) sig;
30}
31
32/*
33 * Open a pipe which ties stderr and stdout together.
34 */
35FILE *
36dlg_popen(const char *command, const char *type)
37{
38    FILE *result = 0;
39    int fd[2];
40    char *blob;
41    char **argv;
42
43    if ((*type == 'r' || *type != 'w') && pipe(fd) == 0) {
44	switch (fork()) {
45	case -1:		/* Error. */
46	    (void) close(fd[0]);
47	    (void) close(fd[1]);
48	    break;
49	case 0:		/* child. */
50	    if (*type == 'r') {
51		if (fd[1] != STDOUT_FILENO) {
52		    (void) dup2(fd[1], STDOUT_FILENO);
53		    (void) close(fd[1]);
54		}
55		(void) dup2(STDOUT_FILENO, STDERR_FILENO);
56		(void) close(fd[0]);
57	    } else {
58		if (fd[0] != STDIN_FILENO) {
59		    (void) dup2(fd[0], STDIN_FILENO);
60		    (void) close(fd[0]);
61		}
62		(void) close(fd[1]);
63		(void) close(STDERR_FILENO);
64	    }
65	    /*
66	     * Bourne shell needs "-c" option to force it to use only the
67	     * given command.  Also, it needs the command to be parsed into
68	     * tokens.
69	     */
70	    if ((blob = malloc(10 + strlen(command))) != 0) {
71		sprintf(blob, "sh -c \"%s\"", command);
72		argv = dlg_string_to_argv(blob);
73		execvp("sh", argv);
74	    }
75	    _exit(127);
76	    /* NOTREACHED */
77	default:		/* parent */
78	    if (*type == 'r') {
79		result = fdopen(fd[0], type);
80		(void) close(fd[1]);
81	    } else {
82		result = fdopen(fd[1], type);
83		(void) close(fd[0]);
84	    }
85	    break;
86	}
87    }
88
89    return result;
90}
91
92/*
93 * Display text from a pipe in a scrolling window.
94 */
95int
96dialog_prgbox(const char *title,
97	      const char *cprompt,
98	      const char *command,
99	      int height,
100	      int width,
101	      int pauseopt)
102{
103    int code;
104    FILE *fp;
105    void (*oldreaper) (int) = signal(SIGCHLD, reapchild);
106
107    fp = dlg_popen(command, "r");
108    if (fp == NULL)
109	dlg_exiterr("pipe open failed: %s", command);
110
111    code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp);
112
113    pclose(fp);
114    signal(SIGCHLD, oldreaper);
115
116    return code;
117}
118