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119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
/*
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* $Id: prgbox.c,v 1.14 2019/07/25 00:07:15 tom Exp $
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*
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* prgbox.c -- implements the prg box
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*
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* Copyright 2011-2016,2019 Thomas E. Dickey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License, version 2.1
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to
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* Free Software Foundation, Inc.
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* 51 Franklin St., Fifth Floor
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* Boston, MA 02110, USA.
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*/
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#include <dialog.h>
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static void
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reapchild(int sig)
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{
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(void) sig;
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}
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/*
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* Open a pipe which ties stderr and stdout together.
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*/
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FILE *
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dlg_popen(const char *command, const char *type)
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{
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FILE *result = 0;
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int fd[2];
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if ((*type == 'r' || *type == 'w') && pipe(fd) == 0) {
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char *blob;
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switch (fork()) {
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case -1: /* Error. */
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(void) close(fd[0]);
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(void) close(fd[1]);
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break;
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case 0: /* child. */
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if (*type == 'r') {
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if (fd[1] != STDOUT_FILENO) {
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(void) dup2(fd[1], STDOUT_FILENO);
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(void) close(fd[1]);
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}
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(void) dup2(STDOUT_FILENO, STDERR_FILENO);
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(void) close(fd[0]);
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} else {
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if (fd[0] != STDIN_FILENO) {
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(void) dup2(fd[0], STDIN_FILENO);
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(void) close(fd[0]);
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}
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(void) close(fd[1]);
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(void) close(STDERR_FILENO);
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}
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/*
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* Bourne shell needs "-c" option to force it to use only the
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* given command. Also, it needs the command to be parsed into
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* tokens.
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*/
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if ((blob = malloc(10 + strlen(command))) != 0) {
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char **argv;
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sprintf(blob, "sh -c \"%s\"", command);
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argv = dlg_string_to_argv(blob);
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execvp("sh", argv);
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}
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_exit(127);
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/* NOTREACHED */
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default: /* parent */
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if (*type == 'r') {
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result = fdopen(fd[0], type);
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(void) close(fd[1]);
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} else {
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result = fdopen(fd[1], type);
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(void) close(fd[0]);
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}
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break;
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}
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}
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return result;
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}
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/*
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* Display text from a pipe in a scrolling window.
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*/
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int
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dialog_prgbox(const char *title,
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const char *cprompt,
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const char *command,
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int height,
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int width,
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int pauseopt)
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{
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int code;
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FILE *fp;
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void (*oldreaper) (int) = signal(SIGCHLD, reapchild);
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fp = dlg_popen(command, "r");
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if (fp == NULL)
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dlg_exiterr("pipe open failed: %s", command);
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code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp);
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pclose(fp);
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signal(SIGCHLD, oldreaper);
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return code;
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}
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