1 /* 2 * $Id: prgbox.c,v 1.7 2011/06/30 20:44:13 tom Exp $ 3 * 4 * prgbox.c -- implements the prg box 5 * 6 * Copyright 2011 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 26 /* 27 * Open a pipe which ties stderr and stdout together. 28 */ 29 static FILE * 30 dlg_popen(const char *command, const char *type) 31 { 32 FILE *result = 0; 33 int fd[2]; 34 int pid; 35 const char *argv[4]; 36 37 if ((*type == 'r' || *type != 'w') && pipe(fd) == 0) { 38 switch (pid = fork()) { 39 case -1: /* Error. */ 40 (void) close(fd[0]); 41 (void) close(fd[1]); 42 break; 43 case 0: /* child. */ 44 if (*type == 'r') { 45 if (fd[1] != STDOUT_FILENO) { 46 (void) dup2(fd[1], STDOUT_FILENO); 47 (void) close(fd[1]); 48 } 49 (void) dup2(STDOUT_FILENO, STDERR_FILENO); 50 (void) close(fd[0]); 51 } else { 52 if (fd[0] != STDIN_FILENO) { 53 (void) dup2(fd[0], STDIN_FILENO); 54 (void) close(fd[0]); 55 } 56 (void) close(fd[1]); 57 (void) close(STDERR_FILENO); 58 } 59 /* 60 * Bourne shell needs "-c" option to force it to use only the 61 * given command. Also, it needs the command to be parsed into 62 * tokens. 63 */ 64 argv[0] = "sh"; 65 argv[1] = "-c"; 66 argv[2] = command; 67 argv[3] = NULL; 68 execvp("sh", (char **)argv); 69 _exit(127); 70 /* NOTREACHED */ 71 default: /* parent */ 72 if (*type == 'r') { 73 result = fdopen(fd[0], type); 74 (void) close(fd[1]); 75 } else { 76 result = fdopen(fd[1], type); 77 (void) close(fd[0]); 78 } 79 break; 80 } 81 } 82 83 return result; 84 } 85 86 /* 87 * Display text from a pipe in a scrolling window. 88 */ 89 int 90 dialog_prgbox(const char *title, 91 const char *cprompt, 92 const char *command, 93 int height, 94 int width, 95 int pauseopt) 96 { 97 int code; 98 FILE *fp; 99 100 fp = dlg_popen(command, "r"); 101 if (fp == NULL) 102 dlg_exiterr("pipe open failed: %s", command); 103 104 code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp); 105 106 pclose(fp); 107 108 return code; 109 } 110