/*      $NetBSD: progress.c,v 1.25 2021/08/17 07:18:43 gson Exp $ */

/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by John Hawkinson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: progress.c,v 1.25 2021/08/17 07:18:43 gson Exp $");
#endif                          /* not lint */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define GLOBAL                  /* force GLOBAL decls in progressbar.h to be
                                * declared */
#include "progressbar.h"

static void broken_pipe(int unused);
__dead static void usage(void);

static void
broken_pipe(int unused)
{
       signal(SIGPIPE, SIG_DFL);
       progressmeter(1);
       kill(getpid(), SIGPIPE);
}

static void
usage(void)
{
       fprintf(stderr,
           "usage: %s [-ez] [-b buffersize] [-f file] [-l length]\n"
           "       %*.s [-p prefix] cmd [args...]\n",
           getprogname(), (int) strlen(getprogname()), "");
       exit(EXIT_FAILURE);
}

int
main(int argc, char *argv[])
{
       char *fb_buf;
       char *infile = NULL;
       pid_t pid = 0, gzippid = 0, deadpid;
       int ch, fd, outpipe[2];
       int ws, gzipstat, cmdstat;
       int eflag = 0, lflag = 0, zflag = 0;
       ssize_t nr, nw, off;
       size_t buffersize;
       struct stat statb;
       struct ttysize ts;

       setprogname(argv[0]);

       /* defaults: Read from stdin, 0 filesize (no completion estimate) */
       fd = STDIN_FILENO;
       filesize = 0;
       buffersize = 64 * 1024;
       prefix = NULL;

       while ((ch = getopt(argc, argv, "b:ef:l:p:z")) != -1)
               switch (ch) {
               case 'b':
                       buffersize = (size_t) strsuftoll("buffer size", optarg,
                           0, SSIZE_MAX);
                       break;
               case 'e':
                       eflag++;
                       break;
               case 'f':
                       infile = optarg;
                       break;
               case 'l':
                       lflag++;
                       filesize = strsuftoll("input size", optarg, 0,
                           LLONG_MAX);
                       break;
               case 'p':
                       prefix = optarg;
                       break;
               case 'z':
                       zflag++;
                       break;
               case '?':
               default:
                       usage();
                       /* NOTREACHED */
               }
       argc -= optind;
       argv += optind;

       if (argc < 1)
               usage();

       if (infile && (fd = open(infile, O_RDONLY, 0)) < 0)
               err(1, "%s", infile);

       /* stat() to get the filesize unless overridden, or -z */
       if (!zflag && !lflag && (fstat(fd, &statb) == 0)) {
               if (S_ISFIFO(statb.st_mode)) {
                       /* stat(2) on pipe may return only the
                        * first few bytes with more coming.
                        * Don't trust!
                        */
               } else {
                       filesize = statb.st_size;
               }
       }

       /* gzip -l the file if we have the name and -z is given */
       if (zflag && !lflag && infile != NULL) {
               FILE *gzipsizepipe;
               char buf[256], *cp, *cmd;

               /*
                * Read second word of last line of gzip -l output. Looks like:
                * % gzip -l ../etc.tgz
                *   compressed uncompressed  ratio uncompressed_name
                *       119737       696320  82.8% ../etc.tar
                */

               asprintf(&cmd, "gzip -l %s", infile);
               if ((gzipsizepipe = popen(cmd, "r")) == NULL)
                       err(1, "reading compressed file length");
               for (; fgets(buf, 256, gzipsizepipe) != NULL;)
                   continue;
               strtoimax(buf, &cp, 10);
               filesize = strtoimax(cp, NULL, 10);
               if (pclose(gzipsizepipe) < 0)
                       err(1, "closing compressed file length pipe");
               free(cmd);
       }
       /* Pipe input through gzip -dc if -z is given */
       if (zflag) {
               int gzippipe[2];

               if (pipe(gzippipe) < 0)
                       err(1, "gzip pipe");
               gzippid = fork();
               if (gzippid < 0)
                       err(1, "fork for gzip");

               if (gzippid) {
                       /* parent */
                       dup2(gzippipe[0], fd);
                       close(gzippipe[0]);
                       close(gzippipe[1]);
               } else {
                       dup2(gzippipe[1], STDOUT_FILENO);
                       dup2(fd, STDIN_FILENO);
                       close(gzippipe[0]);
                       close(gzippipe[1]);
                       if (execlp("gzip", "gzip", "-dc", NULL))
                               err(1, "exec()ing gzip");
               }
       }

       /* Initialize progressbar.c's global state */
       bytes = 0;
       progress = 1;
       ttyout = eflag ? stderr : stdout;

       if (ioctl(fileno(ttyout), TIOCGSIZE, &ts) == -1)
               ttywidth = 80;
       else
               ttywidth = ts.ts_cols;

       fb_buf = malloc(buffersize);
       if (fb_buf == NULL)
               err(1, "malloc for buffersize");

       if (pipe(outpipe) < 0)
               err(1, "output pipe");
       pid = fork();
       if (pid < 0)
               err(1, "fork for output pipe");

       if (pid == 0) {
               /* child */
               dup2(outpipe[0], STDIN_FILENO);
               close(outpipe[0]);
               close(outpipe[1]);
               execvp(argv[0], argv);
               err(1, "could not exec %s", argv[0]);
       }
       close(outpipe[0]);

       signal(SIGPIPE, broken_pipe);
       progressmeter(-1);

       while (1) {
               do {
                       nr = read(fd, fb_buf, buffersize);
               } while (nr < 0 && errno == EINTR);
               if (nr < 0) {
                       progressmeter(1);
                       err(1, "reading input");
               }
               if (nr == 0)
                       break;
               for (off = 0; nr; nr -= nw, off += nw, bytes += nw)
                       if ((nw = write(outpipe[1], fb_buf + off,
                           (size_t) nr)) < 0) {
                               if (errno == EINTR) {
                                       nw = 0;
                                       continue;
                               }
                               progressmeter(1);
                               err(1, "writing %u bytes to output pipe",
                                                       (unsigned) nr);
                       }
       }
       close(outpipe[1]);

       gzipstat = 0;
       cmdstat = 0;
       while (pid || gzippid) {
               deadpid = wait(&ws);
               /*
                * We need to exit with an error if the command (or gzip)
                * exited abnormally.
                * Unfortunately we can't generate a true 'exited by signal'
                * error without sending the signal to ourselves :-(
                */
               ws = WIFSIGNALED(ws) ? WTERMSIG(ws) : WEXITSTATUS(ws);

               if (deadpid == -1 && errno == EINTR)
                       continue;
               if (deadpid == pid) {
                       pid = 0;
                       cmdstat = ws;
                       continue;
               }
               if (deadpid == gzippid) {
                       gzippid = 0;
                       gzipstat = ws;
                       continue;
               }
               break;
       }

       progressmeter(1);
       signal(SIGPIPE, SIG_DFL);

       free(fb_buf);

       exit(cmdstat ? cmdstat : gzipstat);
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.