1 /* 2 * $Id: prgbox.c,v 1.6 2011/03/02 09:59:26 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 as 10 * published by the Free Software Foundation; either version 2.1 of the 11 * License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with this program; if not, write to 20 * Free Software Foundation, Inc. 21 * 51 Franklin St., Fifth Floor 22 * Boston, MA 02110, USA. 23 */ 24 25 #include <dialog.h> 26 27 /* 28 * Open a pipe which ties stderr and stdout together. 29 */ 30 static FILE * 31 dlg_popen(const char *command, const char *type) 32 { 33 FILE *result = 0; 34 int fd[2]; 35 int pid; 36 char *blob; 37 char **argv; 38 39 if ((*type == 'r' || *type != 'w') && pipe(fd) == 0) { 40 switch (pid = fork()) { 41 case -1: /* Error. */ 42 (void) close(fd[0]); 43 (void) close(fd[1]); 44 break; 45 case 0: /* child. */ 46 if (*type == 'r') { 47 if (fd[1] != STDOUT_FILENO) { 48 (void) dup2(fd[1], STDOUT_FILENO); 49 (void) close(fd[1]); 50 } 51 (void) dup2(STDOUT_FILENO, STDERR_FILENO); 52 (void) close(fd[0]); 53 } else { 54 if (fd[0] != STDIN_FILENO) { 55 (void) dup2(fd[0], STDIN_FILENO); 56 (void) close(fd[0]); 57 } 58 (void) close(fd[1]); 59 (void) close(STDERR_FILENO); 60 } 61 /* 62 * Bourne shell needs "-c" option to force it to use only the 63 * given command. Also, it needs the command to be parsed into 64 * tokens. 65 */ 66 if ((blob = malloc(4 + strlen(command))) != 0) { 67 sprintf(blob, "-c %s", command); 68 argv = dlg_string_to_argv(blob); 69 execvp("sh", argv); 70 } 71 _exit(127); 72 /* NOTREACHED */ 73 default: /* parent */ 74 if (*type == 'r') { 75 result = fdopen(fd[0], type); 76 (void) close(fd[1]); 77 } else { 78 result = fdopen(fd[1], type); 79 (void) close(fd[0]); 80 } 81 break; 82 } 83 } 84 85 return result; 86 } 87 88 /* 89 * Display text from a pipe in a scrolling window. 90 */ 91 int 92 dialog_prgbox(const char *title, 93 const char *cprompt, 94 const char *command, 95 int height, 96 int width, 97 int pauseopt) 98 { 99 int code; 100 FILE *fp; 101 102 fp = dlg_popen(command, "r"); 103 if (fp == NULL) 104 dlg_exiterr("pipe open failed: %s", command); 105 106 code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp); 107 108 pclose(fp); 109 110 return code; 111 } 112