1 /* 2 * $Id: prgbox.c,v 1.15 2022/04/03 22:38:16 tom Exp $ 3 * 4 * prgbox.c -- implements the prg box 5 * 6 * Copyright 2011-2019,2022 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 <dlg_internals.h> 25 26 static void 27 reapchild(int sig) 28 { 29 (void) sig; 30 } 31 32 /* 33 * Open a pipe which ties stderr and stdout together. 34 */ 35 FILE * 36 dlg_popen(const char *command, const char *type) 37 { 38 FILE *result = 0; 39 int fd[2]; 40 41 if ((*type == 'r' || *type == 'w') && pipe(fd) == 0) { 42 char *blob; 43 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 char **argv; 72 sprintf(blob, "sh -c \"%s\"", command); 73 argv = dlg_string_to_argv(blob); 74 execvp("sh", argv); 75 } 76 _exit(127); 77 /* NOTREACHED */ 78 default: /* parent */ 79 if (*type == 'r') { 80 result = fdopen(fd[0], type); 81 (void) close(fd[1]); 82 } else { 83 result = fdopen(fd[1], type); 84 (void) close(fd[0]); 85 } 86 break; 87 } 88 } 89 90 return result; 91 } 92 93 /* 94 * Display text from a pipe in a scrolling window. 95 */ 96 int 97 dialog_prgbox(const char *title, 98 const char *cprompt, 99 const char *command, 100 int height, 101 int width, 102 int pauseopt) 103 { 104 int code; 105 FILE *fp; 106 void (*oldreaper) (int) = signal(SIGCHLD, reapchild); 107 108 fp = dlg_popen(command, "r"); 109 if (fp == NULL) 110 dlg_exiterr("pipe open failed: %s", command); 111 112 code = dlg_progressbox(title, cprompt, height, width, pauseopt, fp); 113 114 pclose(fp); 115 signal(SIGCHLD, oldreaper); 116 117 return code; 118 } 119