The Tcpdump Group git mirrors - tcpdump/blob - util.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  */
  21
  22 /*
  23  * txtproto_print() derived from original code by Hannes Gredler
  24  * (hannes@juniper.net):
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that: (1) source code
  28  * distributions retain the above copyright notice and this paragraph
  29  * in its entirety, and (2) distributions including binary code include
  30  * the above copyright notice and this paragraph in its entirety in
  31  * the documentation or other materials provided with the distribution.
  32  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  33  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  34  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE.
  36  */
  37
  38 #ifdef HAVE_CONFIG_H
  39 #include "config.h"
  40 #endif
  41
  42 #include <netdissect-stdinc.h>
  43
  44 #include <sys/stat.h>
  45
  46 #ifdef HAVE_FCNTL_H
  47 #include <fcntl.h>
  48 #endif
  49 #include <stdio.h>
  50 #include <stdarg.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53
  54 #include "interface.h"
  55
  56 /* VARARGS */
  57 void
  58 error(const char *fmt, ...)
  59 {
  60         va_list ap;
  61
  62         (void)fprintf(stderr, "%s: ", program_name);
  63         va_start(ap, fmt);
  64         (void)vfprintf(stderr, fmt, ap);
  65         va_end(ap);
  66         if (*fmt) {
  67                 fmt += strlen(fmt);
  68                 if (fmt[-1] != '\n')
  69                         (void)fputc('\n', stderr);
  70         }
  71         exit(1);
  72         /* NOTREACHED */
  73 }
  74
  75 /* VARARGS */
  76 void
  77 warning(const char *fmt, ...)
  78 {
  79         va_list ap;
  80
  81         (void)fprintf(stderr, "%s: WARNING: ", program_name);
  82         va_start(ap, fmt);
  83         (void)vfprintf(stderr, fmt, ap);
  84         va_end(ap);
  85         if (*fmt) {
  86                 fmt += strlen(fmt);
  87                 if (fmt[-1] != '\n')
  88                         (void)fputc('\n', stderr);
  89         }
  90 }
  91
  92 /*
  93  * Copy arg vector into a new buffer, concatenating arguments with spaces.
  94  */
  95 char *
  96 copy_argv(register char **argv)
  97 {
  98         register char **p;
  99         register u_int len = 0;
 100         char *buf;
 101         char *src, *dst;
 102
 103         p = argv;
 104         if (*p == 0)
 105                 return 0;
 106
 107         while (*p)
 108                 len += strlen(*p++) + 1;
 109
 110         buf = (char *)malloc(len);
 111         if (buf == NULL)
 112                 error("copy_argv: malloc");
 113
 114         p = argv;
 115         dst = buf;
 116         while ((src = *p++) != NULL) {
 117                 while ((*dst++ = *src++) != '\0')
 118                         ;
 119                 dst[-1] = ' ';
 120         }
 121         dst[-1] = '\0';
 122
 123         return buf;
 124 }
 125
 126 /*
 127  * On Windows, we need to open the file in binary mode, so that
 128  * we get all the bytes specified by the size we get from "fstat()".
 129  * On UNIX, that's not necessary.  O_BINARY is defined on Windows;
 130  * we define it as 0 if it's not defined, so it does nothing.
 131  */
 132 #ifndef O_BINARY
 133 #define O_BINARY        0
 134 #endif
 135
 136 char *
 137 read_infile(char *fname)
 138 {
 139         register int i, fd, cc;
 140         register char *cp;
 141         struct stat buf;
 142
 143         fd = open(fname, O_RDONLY|O_BINARY);
 144         if (fd < 0)
 145                 error("can't open %s: %s", fname, pcap_strerror(errno));
 146
 147         if (fstat(fd, &buf) < 0)
 148                 error("can't stat %s: %s", fname, pcap_strerror(errno));
 149
 150         cp = malloc((u_int)buf.st_size + 1);
 151         if (cp == NULL)
 152                 error("malloc(%d) for %s: %s", (u_int)buf.st_size + 1,
 153                         fname, pcap_strerror(errno));
 154         cc = read(fd, cp, (u_int)buf.st_size);
 155         if (cc < 0)
 156                 error("read %s: %s", fname, pcap_strerror(errno));
 157         if (cc != buf.st_size)
 158                 error("short read %s (%d != %d)", fname, cc, (int)buf.st_size);
 159
 160         close(fd);
 161         /* replace "# comment" with spaces */
 162         for (i = 0; i < cc; i++) {
 163                 if (cp[i] == '#')
 164                         while (i < cc && cp[i] != '\n')
 165                                 cp[i++] = ' ';
 166         }
 167         cp[cc] = '\0';
 168         return (cp);
 169 }