1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528
|
/* Pathname and filename functions */
/*
Copyright (C) 2004-2011 John E. Davis
This file is part of the S-Lang Library.
The S-Lang Library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The S-Lang Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
*/
#include "slinclud.h"
#ifdef HAVE_IO_H
# include <io.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include "slang.h"
#include "_slang.h"
/* In this file, all file names are assumed to be specified in the Unix
* format, or in the native format.
*
* Aboout VMS:
* VMS pathnames are a mess. In general, they look like
* node::device:[dir.dir]file.ext;version
* and I do not know of a well-defined Unix representation for them. So,
* I am going to punt and encourage users to stick to the native
* representation.
*/
#if defined(IBMPC_SYSTEM)
# define PATH_SEP '\\'
# define DRIVE_SPECIFIER ':'
# define SEARCH_PATH_DELIMITER ';'
# define THIS_DIR_STRING "."
#else
# if defined(VMS)
# define PATH_SEP ']'
# define DRIVE_SPECIFIER ':'
# define SEARCH_PATH_DELIMITER ' '
# define THIS_DIR_STRING "[]" /* Is this correct?? */
# else
# define PATH_SEP '/'
# define UNIX_PATHNAMES_OK
# define SEARCH_PATH_DELIMITER ':'
# define THIS_DIR_STRING "."
# endif
#endif
#ifdef UNIX_PATHNAMES_OK
# define IS_PATH_SEP(x) ((x) == PATH_SEP)
#else
# define IS_PATH_SEP(x) (((x) == PATH_SEP) || ((x) == '/'))
#endif
#define TEST_VMS_ON_UNIX 0
static char Path_Delimiter = SEARCH_PATH_DELIMITER;
/* If file is /a/b/c/basename, this function returns a pointer to basename */
char *SLpath_basename (SLFUTURE_CONST char *file)
{
char *b;
if (file == NULL) return NULL;
b = (char *) file + strlen (file);
while (b != file)
{
b--;
if (IS_PATH_SEP(*b))
return b + 1;
#ifdef DRIVE_SPECIFIER
if (*b == DRIVE_SPECIFIER)
return b + 1;
#endif
}
return b;
}
/* Returns a malloced string */
char *SLpath_pathname_sans_extname (SLFUTURE_CONST char *file)
{
char *b;
file = SLmake_string (file);
if (file == NULL)
return NULL;
b = (char *) file + strlen (file);
while (b != file)
{
b--;
if (IS_PATH_SEP(*b))
break;
#ifdef DRIVE_SPECIFIER
if (*b == DRIVE_SPECIFIER)
{
b++;
break;
}
#endif
if (*b == '.')
{
*b = 0;
return (char *) file;
}
}
return (char *) file;
}
/* If path looks like: A/B/C/D/whatever, it returns A/B/C/D as a malloced
* string.
*/
char *SLpath_dirname (SLFUTURE_CONST char *file)
{
SLCONST char *b;
if (file == NULL) return NULL;
b = file + strlen (file);
while (b != file)
{
b--;
if (IS_PATH_SEP(*b))
{
#ifdef VMS
b++; /* make sure final ] is included */
#else
if (b == file) b++;
#endif
break;
}
#ifdef DRIVE_SPECIFIER
if (*b == DRIVE_SPECIFIER)
{
b++;
break;
}
#endif
}
if (b == file)
return SLmake_string (THIS_DIR_STRING);
return SLmake_nstring (file, (unsigned int) (b - file));
}
/* Note: VMS filenames also contain version numbers. The caller will have
* to deal with that.
*
* The extension includes the '.'. If no extension is present, "" is returned.
*/
char *SLpath_extname (SLFUTURE_CONST char *file)
{
char *b;
if (NULL == (file = SLpath_basename (file)))
return NULL;
b = (char *) file + strlen (file);
while (b != file)
{
b--;
if (*b == '.')
return b;
}
if (*b == '.')
return b;
/* Do not return a literal "" */
return (char *) file + strlen (file);
}
#ifdef IBMPC_SYSTEM
static void convert_slashes (char *f)
{
while (*f)
{
if (*f == '/') *f = PATH_SEP;
f++;
}
}
#endif
int SLpath_is_absolute_path (SLFUTURE_CONST char *name)
{
if (name == NULL)
return -1;
#ifdef UNIX_PATHNAMES_OK
return (*name == '/');
#else
if (IS_PATH_SEP (*name))
return 1;
# ifdef DRIVE_SPECIFIER
/* Look for a drive specifier */
while (*name)
{
if (*name == DRIVE_SPECIFIER)
return 1;
name++;
}
# endif
return 0;
#endif
}
#if TEST_VMS_ON_UNIX || defined(VMS)
static char *vms_fixup_filename (char *file)
{
char *bracket, *slash, *last_slash;
/* Convert slashes in filenames such as:
* 1. drive:[dir.dir]a/b.c --> drive[dir.dir.a]b.c
* 2. drive:/a/b/c.d --> drive:[a.b]c.d
* 3. drive:a/b/c.d --> drive:[a.b]c.d
* 4. drive:/a.c --> drive:a.c ???
* 5. drive:[dir.dir]/a/b --> drive:a/b
* Since the input pointer is malloced, and the length is preserved for the
* first 2 cases, the conversion may be performed in-place.
*
* FIXME: case 5 is not handled
*/
/* First case */
bracket = strchr (file,']');
if (bracket != NULL)
{
last_slash = NULL;
slash = file;
while (NULL != (slash = strchr (slash, '/')))
{
last_slash = slash;
*slash++ = '.';
}
if (last_slash != NULL)
{
*bracket = '.';
*last_slash = ']';
}
return file;
}
/* Second case */
slash = strchr (file, '/');
if (slash == NULL)
return file;
if ((slash != file) && (*(slash-1) != ':'))
{
/* Case 3: drive:a/b/c.d --> drive:[a.b]c.d */
/* Convert it to case 2: drive:/a/b/c.d */
char *drive;
unsigned int len;
char *new_file = SLmalloc (strlen (file) + 2);
if (new_file == NULL)
{
SLfree (file);
return NULL;
}
drive = strchr (file, ':');
if (drive == NULL)
len = 0;
else
{
len = 1 + (drive-file);
strncpy (new_file, file, len);
}
slash = new_file + len;
*slash = '/';
strcpy (slash + 1, file + len);
SLfree (file);
file = new_file;
}
/* Case 2: drive:/a/b/c.d --> drive:[a.b]c.d */
*slash++ = '[';
last_slash = NULL;
while (NULL != (slash = strchr (slash, '/')))
{
last_slash = slash;
*slash++ = '.';
}
if (last_slash != NULL)
{
*last_slash = ']';
return file;
}
/* case 4: drive:/a.c --> drive:a.c */
slash = strchr (file, '['); /* non-NULL */
while (*slash)
{
*slash = *(slash+1);
slash++;
}
return file;
}
#endif
/* This returns a MALLOCED string */
char *SLpath_dircat (SLFUTURE_CONST char *dir, SLFUTURE_CONST char *name)
{
unsigned int len, dirlen;
char *file;
#ifndef VMS
int requires_fixup;
#endif
if (name == NULL)
name = "";
if ((dir == NULL)
#if !TEST_VMS_ON_UNIX
|| (SLpath_is_absolute_path (name))
#endif
)
dir = "";
/* Both VMS and MSDOS have default directories associated with each drive.
* That is, the meaning of something like C:X depends upon more than just
* the syntax of the string. Since this concept has more power under VMS
* it will be honored here. However, I am going to treat C:X as C:\X
* under MSDOS.
*
* Note!!!
* VMS has problems of its own regarding path names, so I am simply
* going to strcat. Hopefully the VMS RTL is smart enough to deal with
* the result.
*/
dirlen = strlen (dir);
#ifndef VMS
# if TEST_VMS_ON_UNIX
requires_fixup = 0;
# else
requires_fixup = (dirlen && (0 == IS_PATH_SEP(dir[dirlen - 1])));
# endif
#endif
len = dirlen + strlen (name) + 2;
if (NULL == (file = SLmalloc (len)))
return NULL;
strcpy (file, dir);
#ifndef VMS
if (requires_fixup)
file[dirlen++] = PATH_SEP;
#endif
strcpy (file + dirlen, name);
#if defined(IBMPC_SYSTEM)
convert_slashes (file);
#endif
#if TEST_VMS_ON_UNIX || defined (VMS)
return vms_fixup_filename (file);
#else
return file;
#endif
}
int SLpath_file_exists (SLFUTURE_CONST char *file)
{
struct stat st;
int m;
#if defined(__os2__) && !defined(S_IFMT)
/* IBM VA3 doesn't declare S_IFMT */
# define S_IFMT (S_IFDIR | S_IFCHR | S_IFREG)
#endif
#ifdef _S_IFDIR
# ifndef S_IFDIR
# define S_IFDIR _S_IFDIR
# endif
#endif
#ifndef S_ISDIR
# ifdef S_IFDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
# else
# define S_ISDIR(m) 0
# endif
#endif
if (file == NULL)
return -1;
if (stat(file, &st) < 0) return 0;
m = st.st_mode;
if (S_ISDIR(m)) return (2);
return 1;
}
/* By relatively-absolute, I mean paths of the form ./foo,
* and ../foo/bar. But not foo/bar.
*/
static int is_relatively_absolute (SLFUTURE_CONST char *file)
{
if (file == NULL)
return -1;
if (SLpath_is_absolute_path (file))
return 1;
#if defined(VMS)
return (*file == '[');
#else
if (*file == '.') file++;
if (*file == '.') file++;
return (*file == PATH_SEP);
#endif
}
char *SLpath_find_file_in_path (SLFUTURE_CONST char *path, SLFUTURE_CONST char *name)
{
unsigned int max_path_len;
unsigned int this_path_len;
char *file, *dir;
SLCONST char *p;
unsigned int nth;
if ((path == NULL) || (*path == 0)
|| (name == NULL) || (*name == 0))
return NULL;
if (is_relatively_absolute (name))
{
if (0 == SLpath_file_exists (name))
return NULL;
return SLmake_string (name);
}
/* Allow "." to mean the current directory on all systems */
if ((path[0] == '.') && (path[1] == 0))
{
if (0 == SLpath_file_exists (name))
return NULL;
return SLpath_dircat (THIS_DIR_STRING, name);
}
max_path_len = 0;
this_path_len = 0;
p = path;
while (*p != 0)
{
if (*p++ == Path_Delimiter)
{
if (this_path_len > max_path_len) max_path_len = this_path_len;
this_path_len = 0;
}
else this_path_len++;
}
if (this_path_len > max_path_len) max_path_len = this_path_len;
max_path_len++;
if (NULL == (dir = SLmalloc (max_path_len)))
return NULL;
nth = 0;
while (-1 != SLextract_list_element ((char *) path, nth, Path_Delimiter,
dir, max_path_len))
{
nth++;
if (*dir == 0)
continue;
if (NULL == (file = SLpath_dircat (dir, name)))
{
SLfree (dir);
return NULL;
}
if (1 == SLpath_file_exists (file))
{
SLfree (dir);
return file;
}
SLfree (file);
}
SLfree (dir);
return NULL;
}
int SLpath_get_delimiter (void)
{
return Path_Delimiter;
}
int SLpath_set_delimiter (int d)
{
char ch = (char) d;
if (ch == 0)
return -1;
Path_Delimiter = ch;
return 0;
}
|