1 /* 2 * $Id: prgbox.c,v 1.8 2011/10/20 23:42:32 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 const char *argv[4]; 35 36 if ((*type == 'r' || *type != 'w') && pipe(fd) == 0) { 37 switch (fork()) { 38 case -1: /* Error. */ 39 (void) close(fd[0]); 40 (void) close(fd[1]); 41 break; 42 case 0: /* child. */ 43 if (*type == 'r') { 44 if (fd[1] != STDOUT_FILENO) { 45 (void) dup2(fd[1], STDOUT_FILENO); 46 (void) close(fd[1]); 47 } 48 (void) dup2(STDOUT_FILENO, STDERR_FILENO); 49 (void) close(fd[0]); 50 } else { 51 if (fd[0] != STDIN_FILENO) { 52 (void) dup2(fd[0], STDIN_FILENO); 53 (void) close(fd[0]); 54 } 55 (void) close(fd[1]); 56 (void) close(STDERR_FILENO); 57 } 58 /* 59 * Bourne shell needs "-c" option to force it to use only the 60 * given command. Also, it needs the command to be parsed into 61 * tokens. 62 */ 63 argv[0] = "sh"; 64 argv[1] = "-c"; 65 argv[2] = command; 66 argv[3] = NULL; 67 execvp("sh", (char **)argv); 68 _exit(127); 69 /* NOTREACHED */ 70 default: /* parent */ 71 if (*type == 'r') { 72 result = fdopen(fd[0], type); 73 (void) close(fd[1]); 74 } else { 75 result = fdopen(fd[1], type); 76 (void) close(fd[0]); 77 } 78 break; 79 } 80 } 81 82 return result; 83 } 84 85 /* 86 * Display text from a pipe in a scrolling window. 87 */ 88 int 89 dialog_prgbox(const char *title, 90 const char *cprompt, 91 const char *command, 92 int height, 93 int width, 94 int pauseopt) 95 { 96 int code; 97 FILE *fp; 98 99 fp = dlg_popen(command, "r"); 100 if (fp == NULL) 101 dlg_exiterr("pipe open failed: %s", command); 102 103 code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp); 104 105 pclose(fp); 106 107 return code; 108 } 109