curl/src/main.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2005, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

#include "setup.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>

#include <curl/curl.h>

#include "urlglob.h"
#include "writeout.h"
#include "getpass.h"
#include "homedir.h"
#ifdef USE_MANUAL
#include "hugehelp.h"
#endif
#ifdef USE_ENVIRONMENT
#include "writeenv.h"
#endif

#define CURLseparator   "--_curl_--"

#ifdef __NOVELL_LIBC__
#include <screen.h>
#endif

#ifdef TIME_WITH_SYS_TIME
/* We can include both fine */
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#else
# include <time.h>
#endif
#endif


#include "version.h"

#ifdef HAVE_IO_H /* typical win32 habit */
#include <io.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_UTIME_H
#include <utime.h>
#else
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif

#endif /* HAVE_UTIME_H */

#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

#ifdef HAVE_SYS_POLL_H
#include <sys/poll.h>
#endif

#ifdef HAVE_LOCALE_H
#include <locale.h> /* for setlocale() */
#endif

#define ENABLE_CURLX_PRINTF
/* make the curlx header define all printf() functions to use the curlx_*
   versions instead */
#include <curlx.h> /* header from the libcurl directory */

/* The last #include file should be: */
#ifdef CURLDEBUG
#ifndef CURLTOOLDEBUG
#define MEMDEBUG_NODEFINES
#endif
/* This is low-level hard-hacking memory leak tracking and similar. Using
   the library level code from this client-side is ugly, but we do this
   anyway for convenience. */
#include "memdebug.h"
#endif

#define DEFAULT_MAXREDIRS  50L

#ifdef __DJGPP__
#include <dos.h>

char *msdosify(char *);
char *rename_if_dos_device_name(char *);

/* we want to glob our own argv[] */
char **__crt0_glob_function (char *arg)
{
  (void)arg;
  return (char**)0;
}
#endif /* __DJGPP__ */

#define CURL_PROGRESS_STATS 0 /* default progress display */
#define CURL_PROGRESS_BAR   1

/**
 * @def MIN
 * standard MIN macro
 */
#ifndef MIN
#define MIN(X,Y)        (((X) < (Y)) ? (X) : (Y))
#endif

typedef enum {
  HTTPREQ_UNSPEC,
  HTTPREQ_GET,
  HTTPREQ_HEAD,
  HTTPREQ_POST,
  HTTPREQ_SIMPLEPOST,
  HTTPREQ_CUSTOM,
  HTTPREQ_LAST
} HttpReq;

/* Just a set of bits */
#define CONF_DEFAULT  0

#define CONF_AUTO_REFERER (1<<4) /* the automatic referer-system please! */
#define CONF_HEADER   (1<<8) /* throw the header out too */
#define CONF_NOPROGRESS (1<<10) /* shut off the progress meter */
#define CONF_NOBODY   (1<<11) /* use HEAD to get http document */
#define CONF_FAILONERROR (1<<12) /* no output on http error codes >= 300 */
#define CONF_FTPLISTONLY (1<<16) /* Use NLST when listing ftp dir */
#define CONF_FTPAPPEND (1<<20) /* Append instead of overwrite on upload! */
#define CONF_NETRC    (1<<22)  /* read user+password from .netrc */
#define CONF_FOLLOWLOCATION (1<<23) /* use Location: Luke! */
#define CONF_GETTEXT  (1<<24) /* use ASCII/text for transfer */
#define CONF_MUTE     (1<<28) /* force NOPROGRESS */

#define CONF_NETRC_OPT (1<<29)  /* read user+password from either
                                 * .netrc or URL*/
#define CONF_UNRESTRICTED_AUTH (1<<30)
/* Send authentication (user+password) when following
 * locations, even when hostname changed */

#ifndef HAVE_STRDUP
/* Ultrix doesn't have strdup(), so make a quick clone: */
char *strdup(char *str)
{
  int len;
  char *newstr;

  len = strlen(str);
  newstr = (char *) malloc((len+1)*sizeof(char));
  if (!newstr)
    return (char *)NULL;

  strcpy(newstr,str);

  return newstr;

}
#endif

#ifdef WIN32
#include <direct.h>
#define F_OK 0
#define mkdir(x,y) (mkdir)(x)
#endif

#ifdef  VMS
#include "curlmsg_vms.h"
#endif

/* Support uploading and resuming of >2GB files
 */
#if defined(WIN32) && (SIZEOF_CURL_OFF_T > 4)
#define struct_stat struct _stati64
#define stat(file,st) _stati64(file,st)
#else
#define struct_stat struct stat
#endif

#ifdef WIN32
/*
 * Truncate a file handle at a 64-bit position 'where'.
 * Borland doesn't even support 64-bit types.
 */
#ifdef __BORLANDC__
#define _lseeki64(hnd,ofs,whence) lseek(hnd,ofs,whence)
#endif

static int ftruncate64 (int fd, curl_off_t where)
{
  curl_off_t curr;
  int rc = 0;

  if ((curr = _lseeki64(fd, 0, SEEK_CUR)) < 0)
     return -1;

  if (_lseeki64(fd, where, SEEK_SET) < 0)
     return -1;

  if (write(fd, 0, 0) < 0)
     rc = -1;
  _lseeki64(fd, curr, SEEK_SET);
  return rc;
}
#define ftruncate(fd,where) ftruncate64(fd,where)
#endif

typedef enum {
    TRACE_BIN,   /* tcpdump inspired look */
    TRACE_ASCII, /* like *BIN but without the hex output */
    TRACE_PLAIN  /* -v/--verbose type */
} trace;

struct Configurable {
  bool remote_time;
  char *random_file;
  char *egd_file;
  char *useragent;
  char *cookie;     /* single line with specified cookies */
  char *cookiejar;  /* write to this file */
  char *cookiefile; /* read from this file */
  bool cookiesession; /* new session? */
  bool encoding;    /* Accept-Encoding please */
  long authtype;    /* auth bitmask */
  bool use_resume;
  bool resume_from_current;
  bool disable_epsv;
  bool disable_eprt;
  curl_off_t resume_from;
  char *postfields;
  long postfieldsize;
  char *referer;
  long timeout;
  long connecttimeout;
  long maxredirs;
  curl_off_t max_filesize;
  char *headerfile;
  char *ftpport;
  char *iface;
  unsigned short porttouse;
  char *range;
  long low_speed_limit;
  long low_speed_time;
  bool showerror;
  char *userpwd;
  char *proxyuserpwd;
  char *proxy;
  bool proxytunnel;
  long conf;
  struct getout *url_list; /* point to the first node */
  struct getout *url_last; /* point to the last/current node */
  struct getout *url_get;  /* point to the node to fill in URL */
  struct getout *url_out;  /* point to the node to fill in outfile */
  char *cipher_list;
  char *cert;
  char *cert_type;
  char *cacert;
  char *capath;
  char *key;
  char *key_type;
  char *key_passwd;
  char *engine;
  bool list_engines;
  bool crlf;
  char *customrequest;
  char *krb4level;
  char *trace_dump; /* file to dump the network trace to, or NULL */
  FILE *trace_stream;
  bool trace_fopened;
  trace tracetype;
  bool tracetime; /* include timestamp? */
  long httpversion;
  bool progressmode;
  bool nobuffer;
  bool globoff;
  bool use_httpget;
  bool insecure_ok; /* set TRUE to allow insecure SSL connects */
  bool create_dirs;
  bool ftp_create_dirs;
  bool ftp_skip_ip;
  bool proxyntlm;
  bool proxydigest;
  bool proxybasic;
  bool proxyanyauth;
  char *writeout; /* %-styled format string to output */
  bool writeenv; /* write results to environment, if available */
  FILE *errors; /* if stderr redirect is requested */
  bool errors_fopened;
  struct curl_slist *quote;
  struct curl_slist *postquote;
  struct curl_slist *prequote;
  long ssl_version;
  long ip_version;
  curl_TimeCond timecond;
  time_t condtime;
  struct curl_slist *headers;
  struct curl_httppost *httppost;
  struct curl_httppost *last_post;
  struct curl_slist *telnet_options;
  HttpReq httpreq;

  /* for bandwidth limiting features: */
  curl_off_t sendpersecond; /* send to peer */
  curl_off_t recvpersecond; /* receive from peer */
  struct timeval lastsendtime;
  size_t lastsendsize;
  struct timeval lastrecvtime;
  size_t lastrecvsize;
  bool ftp_ssl;
  char *socks5proxy;
  bool tcp_nodelay;
  long req_retry;   /* number of retries */
  long retry_delay; /* delay between retries (in seconds) */
  long retry_maxtime; /* maximum time to keep retrying */

  char *tp_url; /* third party URL */
  char *tp_user; /* third party userpwd */
  struct curl_slist *tp_quote;
  struct curl_slist *tp_postquote;
  struct curl_slist *tp_prequote;
  char *ftp_account; /* for ACCT */
  int ftp_filemethod;

  bool ignorecl; /* --ignore-content-length */
};

#define WARN_PREFIX "Warning: "
#define WARN_TEXTWIDTH (79 - (int)strlen(WARN_PREFIX))
/* produce this text message to the user unless mute was selected */
static void warnf(struct Configurable *config, const char *fmt, ...)
{
  if(!(config->conf & CONF_MUTE)) {
    va_list ap;
    int len;
    char *ptr;
    char print_buffer[256];

    va_start(ap, fmt);
    va_start(ap, fmt);
    len = vsnprintf(print_buffer, sizeof(print_buffer), fmt, ap);
    va_end(ap);

    ptr = print_buffer;
    while(len > 0) {
      fputs(WARN_PREFIX, config->errors);

      if(len > (int)WARN_TEXTWIDTH) {
        int cut = WARN_TEXTWIDTH-1;

        while(!isspace((int)ptr[cut]) && cut) {
          cut--;
        }

        fwrite(ptr, cut + 1, 1, config->errors);
        fputs("\n", config->errors);
        ptr += cut+1; /* skip the space too */
        len -= cut;
      }
      else {
        fputs(ptr, config->errors);
        len = 0;
      }
    }
  }
}

/*
 * This is the main global constructor for the app. Call this before
 * _any_ libcurl usage. If this fails, *NO* libcurl functions may be
 * used, or havoc may be the result.
 */
static CURLcode main_init(void)
{
  return curl_global_init(CURL_GLOBAL_DEFAULT);
}

/*
 * This is the main global destructor for the app. Call this after
 * _all_ libcurl usage is done.
 */
static void main_free(void)
{
  curl_global_cleanup();
}

static int SetHTTPrequest(struct Configurable *config,
                          HttpReq req, HttpReq *store)
{
  if((*store == HTTPREQ_UNSPEC) ||
     (*store == req)) {
    *store = req;
    return 0;
  }
  warnf(config, "You can only select one HTTP request!\n");
  return 1;
}

static void helpf(const char *fmt, ...)
{
  va_list ap;
  if(fmt) {
    va_start(ap, fmt);
    fputs("curl: ", stderr); /* prefix it */
    vfprintf(stderr, fmt, ap);
    va_end(ap);
  }
  fprintf(stderr, "curl: try 'curl --help' "
#ifdef USE_MANUAL
          "or 'curl --manual' "
#endif
          "for more information\n");
}

/*
 * A chain of these nodes contain URL to get and where to put the URL's
 * contents.
 */
struct getout {
  struct getout *next; /* next one */
  char *url;     /* the URL we deal with */
  char *outfile; /* where to store the output */
  char *infile;  /* file to upload, if GETOUT_UPLOAD is set */
  int flags;     /* options */
};
#define GETOUT_OUTFILE (1<<0)   /* set when outfile is deemed done */
#define GETOUT_URL     (1<<1)   /* set when URL is deemed done */
#define GETOUT_USEREMOTE (1<<2) /* use remote file name locally */
#define GETOUT_UPLOAD  (1<<3)   /* if set, -T has been used */
#define GETOUT_NOUPLOAD  (1<<4) /* if set, -T "" has been used */

static void help(void)
{
  int i;
  static const char * const helptext[]={
    "Usage: curl [options...] <url>",
    "Options: (H) means HTTP/HTTPS only, (F) means FTP only",
    " -a/--append        Append to target file when uploading (F)",
    " -A/--user-agent <string> User-Agent to send to server (H)",
    "    --anyauth       Pick \"any\" authentication method (H)",
    " -b/--cookie <name=string/file> Cookie string or file to read cookies from (H)",
    "    --basic         Use HTTP Basic Authentication (H)",
    " -B/--use-ascii     Use ASCII/text transfer",
    " -c/--cookie-jar <file> Write cookies to this file after operation (H)",
    " -C/--continue-at <offset> Resumed transfer offset",
    " -d/--data <data>   HTTP POST data (H)",
    "    --data-ascii <data>  HTTP POST ASCII data (H)",
    "    --data-binary <data> HTTP POST binary data (H)",
    "    --negotiate     Use HTTP Negotiate Authentication (H)",
    "    --digest        Use HTTP Digest Authentication (H)",
    "    --disable-eprt  Inhibit using EPRT or LPRT (F)",
    "    --disable-epsv  Inhibit using EPSV (F)",
    " -D/--dump-header <file> Write the headers to this file",
    "    --egd-file <file> EGD socket path for random data (SSL)",
    "    --tcp-nodelay   Use the TCP_NODELAY option",
#ifdef USE_ENVIRONMENT
    "    --environment   Write results to environment variables (RISC OS)",
#endif
    " -e/--referer       Referer URL (H)",
    " -E/--cert <cert[:passwd]> Client certificate file and password (SSL)",
    "    --cert-type <type> Certificate file type (DER/PEM/ENG) (SSL)",
    "    --key <key>     Private key file name (SSL)",
    "    --key-type <type> Private key file type (DER/PEM/ENG) (SSL)",
    "    --pass  <pass>  Pass phrase for the private key (SSL)",
    "    --engine <eng>  Crypto engine to use (SSL). \"--engine list\" for list",
    "    --cacert <file> CA certificate to verify peer against (SSL)",
    "    --capath <directory> CA directory (made using c_rehash) to verify",
    "                    peer against (SSL)",
    "    --ciphers <list> SSL ciphers to use (SSL)",
    "    --compressed    Request compressed response (using deflate or gzip)",
    "    --connect-timeout <seconds> Maximum time allowed for connection",
    "    --create-dirs   Create necessary local directory hierarchy",
    "    --crlf          Convert LF to CRLF in upload",
    " -f/--fail          Fail silently (no output at all) on HTTP errors (H)",
    "    --ftp-create-dirs Create the remote dirs if not present (F)",
    "    --ftp-pasv      Use PASV/EPSV instead of PORT (F)",
    "    --ftp-skip-pasv-ip Skip the IP address for PASV (F)\n"
    "    --ftp-ssl       Enable SSL/TLS for the ftp transfer (F)",
    " -F/--form <name=content> Specify HTTP multipart POST data (H)",
    "    --form-string <name=string> Specify HTTP multipart POST data (H)",
    " -g/--globoff       Disable URL sequences and ranges using {} and []",
    " -G/--get           Send the -d data with a HTTP GET (H)",
    " -h/--help          This help text",
    " -H/--header <line> Custom header to pass to server (H)",
    "    --ignore-content-length  Ignore the HTTP Content-Length header",
    " -i/--include       Include protocol headers in the output (H/F)",
    " -I/--head          Show document info only",
    " -j/--junk-session-cookies Ignore session cookies read from file (H)",
    "    --interface <interface> Specify network interface to use",
    "    --krb4 <level>  Enable krb4 with specified security level (F)",
    " -k/--insecure      Allow connections to SSL sites without certs (H)",
    " -K/--config        Specify which config file to read",
    " -l/--list-only     List only names of an FTP directory (F)",
    "    --limit-rate <rate> Limit transfer speed to this rate",
    " -L/--location      Follow Location: hints (H)",
    "    --location-trusted Follow Location: and send authentication even ",
    "                    to other hostnames (H)",
    " -m/--max-time <seconds> Maximum time allowed for the transfer",
    "    --max-redirs <num> Maximum number of redirects allowed (H)",
    "    --max-filesize <bytes> Maximum file size to download (H/F)",
    " -M/--manual        Display the full manual",
    " -n/--netrc         Must read .netrc for user name and password",
    "    --netrc-optional Use either .netrc or URL; overrides -n",
    "    --ntlm          Use HTTP NTLM authentication (H)",
    " -N/--no-buffer     Disable buffering of the output stream",
    " -o/--output <file> Write output to <file> instead of stdout",
    " -O/--remote-name   Write output to a file named as the remote file",
    " -p/--proxytunnel   Operate through a HTTP proxy tunnel (using CONNECT)",
    "    --proxy-anyauth Pick \"any\" proxy authentication method (H)",
    "    --proxy-basic   Use Basic authentication on the proxy (H)",
    "    --proxy-digest  Use Digest authentication on the proxy (H)",
    "    --proxy-ntlm    Use NTLM authentication on the proxy (H)",
    " -P/--ftp-port <address> Use PORT with address instead of PASV (F)",
    " -q                 If used as the first parameter disables .curlrc",
    " -Q/--quote <cmd>   Send command(s) to server before file transfer (F)",
    " -r/--range <range> Retrieve a byte range from a HTTP/1.1 or FTP server",
    "    --random-file <file> File for reading random data from (SSL)",
    " -R/--remote-time   Set the remote file's time on the local output",
    "    --retry <num>   Retry request <num> times if transient problems occur",
    "    --retry-delay <seconds> When retrying, wait this many seconds between each",
    "    --retry-max-time <seconds> Retry only within this period",
    " -s/--silent        Silent mode. Don't output anything",
    " -S/--show-error    Show error. With -s, make curl show errors when they occur",
    "    --socks <host[:port]> Use SOCKS5 proxy on given host + port",
    "    --stderr <file> Where to redirect stderr. - means stdout",
    " -t/--telnet-option <OPT=val> Set telnet option",
    "    --trace <file>  Write a debug trace to the given file",
    "    --trace-ascii <file> Like --trace but without the hex output",
    "    --trace-time    Add time stamps to trace/verbose output",
    " -T/--upload-file <file> Transfer <file> to remote site",
    "    --url <URL>     Spet URL to work with",
    " -u/--user <user[:password]> Set server user and password",
    " -U/--proxy-user <user[:password]> Set proxy user and password",
    " -v/--verbose       Make the operation more talkative",
    " -V/--version       Show version number and quit",
#ifdef __DJGPP__
    "    --wdebug        Turn on Watt-32 debugging under DJGPP",
#endif
    " -w/--write-out [format] What to output after completion",
    " -x/--proxy <host[:port]> Use HTTP proxy on given port",
    " -X/--request <command> Specify request command to use",
    " -y/--speed-time    Time needed to trig speed-limit abort. Defaults to 30",
    " -Y/--speed-limit   Stop transfer if below speed-limit for 'speed-time' secs",
    " -z/--time-cond <time> Transfer based on a time condition",
    " -0/--http1.0       Use HTTP 1.0 (H)",
    " -1/--tlsv1         Use TLSv1 (SSL)",
    " -2/--sslv2         Use SSLv2 (SSL)",
    " -3/--sslv3         Use SSLv3 (SSL)",
    "    --3p-quote      like -Q for the source URL for 3rd party transfer (F)",
    "    --3p-url        source URL to activate 3rd party transfer (F)",
    "    --3p-user       user and password for source 3rd party transfer (F)",
    " -4/--ipv4          Resolve name to IPv4 address",
    " -6/--ipv6          Resolve name to IPv6 address",
    " -#/--progress-bar  Display transfer progress as a progress bar",
    NULL
  };
  for(i=0; helptext[i]; i++) {
    puts(helptext[i]);
#ifdef __NOVELL_LIBC__
    if (i && ((i % 23) == 0))
      pressanykey();
#endif
  }
}

struct LongShort {
  const char *letter;
  const char *lname;
  bool extraparam;
};

/* global variable to hold info about libcurl */
static curl_version_info_data *curlinfo;

static void parseconfig(const char *filename,
                        struct Configurable *config);
static char *my_get_line(FILE *fp);
static int create_dir_hierarchy(char *outfile);

static void GetStr(char **string,
                   char *value)
{
  if(*string)
    free(*string);
  if(value)
    *string = strdup(value);
  else
    *string = NULL;
}

static char *file2string(FILE *file)
{
  char buffer[256];
  char *ptr;
  char *string=NULL;
  size_t len=0;
  size_t stringlen;

  if(file) {
    while(fgets(buffer, sizeof(buffer), file)) {
      ptr= strchr(buffer, '\r');
      if(ptr)
        *ptr=0;
      ptr= strchr(buffer, '\n');
      if(ptr)
        *ptr=0;
      stringlen=strlen(buffer);
      if(string)
        string = realloc(string, len+stringlen+1);
      else
        string = malloc(stringlen+1);

      strcpy(string+len, buffer);

      len+=stringlen;
    }
    return string;
  }
  else
    return NULL; /* no string */
}

static char *file2memory(FILE *file, long *size)
{
  char buffer[1024];
  char *string=NULL;
  char *newstring=NULL;
  size_t len=0;
  long stringlen=0;

  if(file) {
    while((len = fread(buffer, 1, sizeof(buffer), file))) {
      if(string) {
        newstring = realloc(string, len+stringlen);
        if(newstring)
          string = newstring;
        else
          break; /* no more strings attached! :-) */
      }
      else
        string = malloc(len);
      memcpy(&string[stringlen], buffer, len);
      stringlen+=len;
    }
    *size = stringlen;
    return string;
  }
  else
    return NULL; /* no string */
}

static void clean_getout(struct Configurable *config)
{
  struct getout *node=config->url_list;
  struct getout *next;

  while(node) {
    next = node->next;
    if(node->url)
      free(node->url);
    if(node->outfile)
      free(node->outfile);
    if(node->infile)
      free(node->infile);
    free(node);

    node = next; /* GOTO next */
  }
}

static struct getout *new_getout(struct Configurable *config)
{
  struct getout *node =malloc(sizeof(struct getout));
  struct getout *last= config->url_last;
  if(node) {
    /* clear the struct */
    memset(node, 0, sizeof(struct getout));

    /* append this new node last in the list */
    if(last)
      last->next = node;
    else
      config->url_list = node; /* first node */

    /* move the last pointer */
    config->url_last = node;
  }
  return node;
}

/* Structure for storing the information needed to build a multiple files
 * section
*/
struct multi_files {
  struct curl_forms   form;
  struct multi_files *next;
};

/* Add a new list entry possibly with a type_name
 */
static struct multi_files *
AddMultiFiles (const char *file_name,
               const char *type_name,
               const char *show_filename,
               struct multi_files **multi_start,
               struct multi_files **multi_current)
{
  struct multi_files *multi;
  struct multi_files *multi_type = NULL;
  struct multi_files *multi_name = NULL;
  multi = (struct multi_files *)malloc(sizeof(struct multi_files));
  if (multi) {
    memset(multi, 0, sizeof(struct multi_files));
    multi->form.option = CURLFORM_FILE;
    multi->form.value = file_name;
  }
  else
    return NULL;

  if (!*multi_start)
    *multi_start = multi;

  if (type_name) {
    multi_type = (struct multi_files *)malloc(sizeof(struct multi_files));
    if (multi_type) {
      memset(multi_type, 0, sizeof(struct multi_files));
      multi_type->form.option = CURLFORM_CONTENTTYPE;
      multi_type->form.value = type_name;
      multi->next = multi_type;

      multi = multi_type;
    }
    else {
      free (multi);
      return NULL;
    }
  }
  if (show_filename) {
    multi_name = (struct multi_files *)malloc(sizeof(struct multi_files));
    if (multi_name) {
      memset(multi_name, 0, sizeof(struct multi_files));