[3365] | 1 | /**************************************************************************
|
---|
| 2 | *
|
---|
| 3 | * mg_files.cpp -- Routines for handling files for the auxillary programs
|
---|
| 4 | * Copyright (C) 1994 Neil Sharman
|
---|
| 5 | *
|
---|
| 6 | * This program is free software; you can redistribute it and/or modify
|
---|
| 7 | * it under the terms of the GNU General Public License as published by
|
---|
| 8 | * the Free Software Foundation; either version 2 of the License, or
|
---|
| 9 | * (at your option) any later version.
|
---|
| 10 | *
|
---|
| 11 | * This program is distributed in the hope that it will be useful,
|
---|
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
---|
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
---|
| 14 | * GNU General Public License for more details.
|
---|
| 15 | *
|
---|
| 16 | * You should have received a copy of the GNU General Public License
|
---|
| 17 | * along with this program; if not, write to the Free Software
|
---|
| 18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
---|
| 19 | *
|
---|
| 20 | **************************************************************************/
|
---|
| 21 |
|
---|
| 22 | #define _XOPEN_SOURCE 1
|
---|
| 23 | #define _XOPEN_SOURCE_EXTENDED 1
|
---|
| 24 | #include "sysfuncs.h"
|
---|
| 25 | #include "memlib.h"
|
---|
| 26 | #include "messages.h"
|
---|
| 27 | #include "netorder.h" /* [RPAP - Jan 97: Endian Ordering] */
|
---|
| 28 |
|
---|
| 29 | #include "mg_files.h"
|
---|
| 30 |
|
---|
| 31 |
|
---|
| 32 | /* This must contain a valid path without a trailing slash */
|
---|
| 33 | static char *basepath = NULL;
|
---|
| 34 |
|
---|
| 35 | /* This sets the base path for all file operations */
|
---|
| 36 | void
|
---|
| 37 | set_basepath (const char *bp)
|
---|
| 38 | {
|
---|
| 39 | /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 40 | #ifdef __WIN32__
|
---|
| 41 | basepath = "";
|
---|
| 42 | #else
|
---|
| 43 | char *s;
|
---|
| 44 | /* Free the memory for the base path if it has already been allocated */
|
---|
| 45 | if (basepath)
|
---|
| 46 | {
|
---|
| 47 | delete basepath;
|
---|
| 48 | basepath = NULL;
|
---|
| 49 | }
|
---|
| 50 |
|
---|
| 51 | if (!bp || *bp == '\0')
|
---|
| 52 | bp = ".";
|
---|
| 53 |
|
---|
| 54 | s = strrchr (bp, '/');
|
---|
| 55 | if (s && *(s + 1) == '\0')
|
---|
| 56 | {
|
---|
| 57 | basepath = new char[strlen (bp) + 2];
|
---|
| 58 | if (!basepath)
|
---|
| 59 | return;
|
---|
| 60 | strcpy (basepath, bp);
|
---|
| 61 | strcat (basepath, ".");
|
---|
| 62 | }
|
---|
| 63 | else
|
---|
| 64 | basepath = Xstrdup (bp);
|
---|
| 65 | #endif
|
---|
| 66 | }
|
---|
| 67 |
|
---|
| 68 |
|
---|
| 69 |
|
---|
| 70 | /* return the currently defined basepath */
|
---|
| 71 | char *
|
---|
| 72 | get_basepath (void)
|
---|
| 73 | {
|
---|
| 74 | if (!basepath)
|
---|
| 75 | set_basepath (getenv ("MGDATA"));
|
---|
| 76 | return basepath;
|
---|
| 77 | }
|
---|
| 78 |
|
---|
| 79 |
|
---|
| 80 |
|
---|
| 81 | /* This generates the name of a file. It places the name in the buffer
|
---|
| 82 | specified or if that is NULL it uses a static buffer. */
|
---|
| 83 | char *
|
---|
| 84 | make_name (const char *name, const char *suffix, char *buffer)
|
---|
| 85 | {
|
---|
| 86 | static char path[512];
|
---|
| 87 | if (!buffer)
|
---|
| 88 | buffer = path;
|
---|
| 89 | if (!basepath)
|
---|
| 90 | set_basepath (getenv ("MGDATA"));
|
---|
| 91 | sprintf (buffer, FILE_NAME_FORMAT, basepath, name, suffix); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 92 | return buffer;
|
---|
| 93 | }
|
---|
| 94 |
|
---|
| 95 |
|
---|
| 96 |
|
---|
| 97 | /* This will open the specified file and check its magic number.
|
---|
| 98 | Mode may take on the following values
|
---|
| 99 | MG_ABORT : causes an error message to be generated and the
|
---|
| 100 | program aborted if there is an error.
|
---|
| 101 | MG_MESSAGE : causes a message to be generated and a NULL value to
|
---|
| 102 | be returned if there is an error.
|
---|
| 103 | MG_CONTINUE : causes a NULL value to be returned if there is an error.
|
---|
| 104 |
|
---|
| 105 | On success if returns the FILE *. On failure it will return a NULL value
|
---|
| 106 | and possibly generate an error message, or it will exit the program with
|
---|
| 107 | an error message. */
|
---|
| 108 | FILE *
|
---|
| 109 | open_named_file (const char *name, const char *mode,
|
---|
| 110 | u_long magic_num, int err_mode)
|
---|
| 111 | {
|
---|
| 112 | unsigned long magic;
|
---|
| 113 | FILE *f = NULL;
|
---|
| 114 | char *err;
|
---|
| 115 | f = fopen (name, mode);
|
---|
| 116 |
|
---|
| 117 | if (!f)
|
---|
| 118 | {
|
---|
| 119 | err = "Unable to open \"%s\"";
|
---|
| 120 | goto error;
|
---|
| 121 | }
|
---|
| 122 |
|
---|
| 123 | if (magic_num)
|
---|
| 124 | {
|
---|
| 125 | if (fread (&magic, sizeof (magic), 1, f) != 1)
|
---|
| 126 | {
|
---|
| 127 | err = "No magic number \"%s\"";
|
---|
| 128 | goto error;
|
---|
| 129 | }
|
---|
| 130 |
|
---|
| 131 | NTOHUL(magic); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
| 132 |
|
---|
| 133 | if (!IS_MAGIC (magic))
|
---|
| 134 | {
|
---|
| 135 | err = "No MG magic number \"%s\"";
|
---|
| 136 | goto error;
|
---|
| 137 | }
|
---|
| 138 |
|
---|
| 139 | if (magic != magic_num)
|
---|
| 140 | {
|
---|
| 141 | err = "Wrong MG magic number \"%s\"";
|
---|
| 142 | goto error;
|
---|
| 143 | }
|
---|
| 144 | }
|
---|
| 145 | return f;
|
---|
| 146 |
|
---|
| 147 | error:
|
---|
| 148 | if (f)
|
---|
| 149 | fclose (f);
|
---|
| 150 | if (err_mode == MG_ABORT)
|
---|
| 151 | FatalError (1, err, name);
|
---|
| 152 | if (err_mode == MG_MESSAGE)
|
---|
| 153 | Message (err, name);
|
---|
| 154 | return NULL;
|
---|
| 155 | }
|
---|
| 156 |
|
---|
| 157 |
|
---|
| 158 |
|
---|
| 159 | /* This will open the specified file and check its magic number.
|
---|
| 160 | Mode may take on the following values
|
---|
| 161 | MG_ABORT : causes an error message to be generated and the
|
---|
| 162 | program aborted if there is an error.
|
---|
| 163 | MG_MESSAGE : causes a message to be generated and a NULL value to
|
---|
| 164 | be returned if there is an error.
|
---|
| 165 | MG_CONTINUE : causes a NULL value to be returned if there is an error.
|
---|
| 166 |
|
---|
| 167 | On success if returns the FILE *. On failure it will return a NULL value
|
---|
| 168 | and possibly generate an error message, or it will exit the program with
|
---|
| 169 | an error message. */
|
---|
| 170 | FILE *
|
---|
| 171 | open_file (const char *name, const char *suffix, const char *mode,
|
---|
| 172 | u_long magic_num, int err_mode)
|
---|
| 173 | {
|
---|
| 174 | char path[512];
|
---|
| 175 | if (!basepath)
|
---|
| 176 | set_basepath (getenv ("MGDATA"));
|
---|
| 177 | sprintf (path, FILE_NAME_FORMAT, basepath, name, suffix); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 178 | return open_named_file (path, mode, magic_num, err_mode);
|
---|
| 179 | }
|
---|
| 180 |
|
---|
| 181 |
|
---|
| 182 |
|
---|
| 183 |
|
---|
| 184 |
|
---|
| 185 |
|
---|
| 186 | /* This will create the specified file and set its magic number.
|
---|
| 187 |
|
---|
| 188 | Mode may take on the following values
|
---|
| 189 | MG_ABORT : causes an error message to be generated and the
|
---|
| 190 | program aborted if there is an error.
|
---|
| 191 | MG_MESSAGE : causes a message to be generated and a NULL value to
|
---|
| 192 | be returned if there is an error.
|
---|
| 193 | MG_CONTINUE : causes a NULL value to be returned if there is an error.
|
---|
| 194 |
|
---|
| 195 | On success if returns the FILE *. On failure it will return a NULL value
|
---|
| 196 | and possibly generate an error message, or it will exit the program with
|
---|
| 197 | an error message. */
|
---|
| 198 | FILE *
|
---|
| 199 | create_named_file (const char *name, const char *mode,
|
---|
| 200 | u_long magic_num, int err_mode)
|
---|
| 201 | {
|
---|
| 202 | FILE *f = NULL;
|
---|
| 203 | char *err;
|
---|
| 204 | f = fopen (name, mode);
|
---|
| 205 |
|
---|
| 206 | if (!f)
|
---|
| 207 | {
|
---|
| 208 | err = "Unable to open \"%s\"";
|
---|
| 209 | goto error;
|
---|
| 210 | }
|
---|
| 211 |
|
---|
| 212 | if (magic_num)
|
---|
| 213 | HTONUL(magic_num); /* [RPAP - Jan 97: Endian Ordering] */
|
---|
| 214 | if (fwrite (&magic_num, sizeof (magic_num), 1, f) != 1)
|
---|
| 215 | {
|
---|
| 216 | err = "Couldn't write magic number \"%s\"";
|
---|
| 217 | goto error;
|
---|
| 218 | }
|
---|
| 219 |
|
---|
| 220 | return f;
|
---|
| 221 |
|
---|
| 222 | error:
|
---|
| 223 | if (f)
|
---|
| 224 | fclose (f);
|
---|
| 225 | if (err_mode == MG_ABORT)
|
---|
| 226 | FatalError (1, err, name);
|
---|
| 227 | if (err_mode == MG_MESSAGE)
|
---|
| 228 | Message (err, name);
|
---|
| 229 | return NULL;
|
---|
| 230 | }
|
---|
| 231 |
|
---|
| 232 |
|
---|
| 233 |
|
---|
| 234 |
|
---|
| 235 |
|
---|
| 236 |
|
---|
| 237 |
|
---|
| 238 | /* This will create the specified file and set its magic number.
|
---|
| 239 |
|
---|
| 240 | Mode may take on the following values
|
---|
| 241 | MG_ABORT : causes an error message to be generated and the
|
---|
| 242 | program aborted if there is an error.
|
---|
| 243 | MG_MESSAGE : causes a message to be generated and a NULL value to
|
---|
| 244 | be returned if there is an error.
|
---|
| 245 | MG_CONTINUE : causes a NULL value to be returned if there is an error.
|
---|
| 246 |
|
---|
| 247 | On success if returns the FILE *. On failure it will return a NULL value
|
---|
| 248 | and possibly generate an error message, or it will exit the program with
|
---|
| 249 | an error message. */
|
---|
| 250 | FILE *
|
---|
| 251 | create_file (const char *name, const char *suffix, const char *mode,
|
---|
| 252 | u_long magic_num, int err_mode)
|
---|
| 253 | {
|
---|
| 254 | char path[512];
|
---|
| 255 | if (!basepath)
|
---|
| 256 | set_basepath (getenv ("MGDATA"));
|
---|
| 257 | sprintf (path, FILE_NAME_FORMAT, basepath, name, suffix); /* [RPAP - Feb 97: WIN32 Port] */
|
---|
| 258 | return create_named_file (path, mode, magic_num, err_mode);
|
---|
| 259 | }
|
---|