eglib/src/gpath.c

   1 /*
   2  * Portable Utility Functions
   3  *
   4  * Author:
   5  *   Miguel de Icaza (miguel@novell.com)
   6  *
   7  * (C) 2006 Novell, Inc.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining
  10  * a copy of this software and associated documentation files (the
  11  * "Software"), to deal in the Software without restriction, including
  12  * without limitation the rights to use, copy, modify, merge, publish,
  13  * distribute, sublicense, and/or sell copies of the Software, and to
  14  * permit persons to whom the Software is furnished to do so, subject to
  15  * the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be
  18  * included in all copies or substantial portions of the Software.
  19  *
  20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28 #include <config.h>
  29 #include <stdio.h>
  30 #include <glib.h>
  31 #include <errno.h>
  32 #include <sys/stat.h>
  33
  34 #ifdef G_OS_WIN32
  35 #include <direct.h>
  36 #endif
  37
  38 #ifdef HAVE_UNISTD_H
  39 #include <unistd.h>
  40 #endif
  41
  42 gchar *
  43 g_build_path (const gchar *separator, const gchar *first_element, ...)
  44 {
  45         const char *elem, *next, *endptr;
  46         gboolean trimmed;
  47         GString *path;
  48         va_list args;
  49         size_t slen;
  50
  51         g_return_val_if_fail (separator != NULL, NULL);
  52
  53         path = g_string_sized_new (48);
  54         slen = strlen (separator);
  55
  56         va_start (args, first_element);
  57         for (elem = first_element; elem != NULL; elem = next) {
  58                 /* trim any trailing separators from @elem */
  59                 endptr = elem + strlen (elem);
  60                 trimmed = FALSE;
  61
  62                 while (endptr >= elem + slen) {
  63                         if (strncmp (endptr - slen, separator, slen) != 0)
  64                                 break;
  65
  66                         endptr -= slen;
  67                         trimmed = TRUE;
  68                 }
  69
  70                 /* append elem, not including any trailing separators */
  71                 if (endptr > elem)
  72                         g_string_append_len (path, elem, endptr - elem);
  73
  74                 /* get the next element */
  75                 do {
  76                         if (!(next = va_arg (args, char *)))
  77                                 break;
  78
  79                         /* remove leading separators */
  80                         while (!strncmp (next, separator, slen))
  81                                 next += slen;
  82                 } while (*next == '\0');
  83
  84                 if (next || trimmed)
  85                         g_string_append_len (path, separator, slen);
  86         }
  87         va_end (args);
  88
  89         return g_string_free (path, FALSE);
  90 }
  91
  92 static gchar*
  93 strrchr_seperator (const gchar* filename)
  94 {
  95 #ifdef G_OS_WIN32
  96         char *p2;
  97 #endif
  98         char *p;
  99
 100         p = strrchr (filename, G_DIR_SEPARATOR);
 101 #ifdef G_OS_WIN32
 102         p2 = strrchr (filename, '/');
 103         if (p2 > p)
 104                 p = p2;
 105 #endif
 106
 107         return p;
 108 }
 109
 110 gchar *
 111 g_path_get_dirname (const gchar *filename)
 112 {
 113         char *p, *r;
 114         size_t count;
 115         g_return_val_if_fail (filename != NULL, NULL);
 116
 117         p = strrchr_seperator (filename);
 118         if (p == NULL)
 119                 return g_strdup (".");
 120         if (p == filename)
 121                 return g_strdup ("/");
 122         count = p - filename;
 123         r = g_malloc (count + 1);
 124         strncpy (r, filename, count);
 125         r [count] = 0;
 126
 127         return r;
 128 }
 129
 130 gchar *
 131 g_path_get_basename (const char *filename)
 132 {
 133         char *r;
 134         g_return_val_if_fail (filename != NULL, NULL);
 135
 136         /* Empty filename -> . */
 137         if (!*filename)
 138                 return g_strdup (".");
 139
 140         /* No separator -> filename */
 141         r = strrchr_seperator (filename);
 142         if (r == NULL)
 143                 return g_strdup (filename);
 144
 145         /* Trailing slash, remove component */
 146         if (r [1] == 0){
 147                 char *copy = g_strdup (filename);
 148                 copy [r-filename] = 0;
 149                 r = strrchr_seperator (copy);
 150
 151                 if (r == NULL){
 152                         g_free (copy);
 153                         return g_strdup ("/");
 154                 }
 155                 r = g_strdup (&r[1]);
 156                 g_free (copy);
 157                 return r;
 158         }
 159
 160         return g_strdup (&r[1]);
 161 }
 162
 163 #ifndef HAVE_STRTOK_R
 164 // This is from BSD's strtok_r
 165
 166 char *
 167 strtok_r(char *s, const char *delim, char **last)
 168 {
 169         char *spanp;
 170         int c, sc;
 171         char *tok;
 172
 173         if (s == NULL && (s = *last) == NULL)
 174                 return NULL;
 175
 176         /*
 177          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
 178          */
 179 cont:
 180         c = *s++;
 181         for (spanp = (char *)delim; (sc = *spanp++) != 0; ){
 182                 if (c == sc)
 183                         goto cont;
 184         }
 185
 186         if (c == 0){         /* no non-delimiter characters */
 187                 *last = NULL;
 188                 return NULL;
 189         }
 190         tok = s - 1;
 191
 192         /*
 193          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
 194          * Note that delim must have one NUL; we stop if we see that, too.
 195          */
 196         for (;;){
 197                 c = *s++;
 198                 spanp = (char *)delim;
 199                 do {
 200                         if ((sc = *spanp++) == c) {
 201                                 if (c == 0)
 202                                         s = NULL;
 203                                 else {
 204                                         char *w = s - 1;
 205                                         *w = '\0';
 206                                 }
 207                                 *last = s;
 208                                 return tok;
 209                         }
 210                 }
 211                 while (sc != 0);
 212         }
 213         /* NOTREACHED */
 214 }
 215 #endif
 216
 217 gchar *
 218 g_find_program_in_path (const gchar *program)
 219 {
 220         char *p;
 221         char *x, *l;
 222         gchar *curdir = NULL;
 223         char *save = NULL;
 224 #ifdef G_OS_WIN32
 225         char *program_exe;
 226         char *suffix_list[5] = {".exe",".cmd",".bat",".com",NULL};
 227         int listx;
 228         gboolean hasSuffix;
 229 #endif
 230
 231         g_return_val_if_fail (program != NULL, NULL);
 232         x = p = g_strdup (g_getenv ("PATH"));
 233
 234         if (x == NULL || *x == '\0') {
 235                 curdir = g_get_current_dir ();
 236                 x = curdir;
 237         }
 238
 239 #ifdef G_OS_WIN32
 240         /* see if program already has a suffix */
 241         listx = 0;
 242         hasSuffix = FALSE;
 243         while (!hasSuffix && suffix_list[listx]) {
 244                 hasSuffix = g_str_has_suffix(program,suffix_list[listx++]);
 245         }
 246 #endif
 247
 248         while ((l = strtok_r (x, G_SEARCHPATH_SEPARATOR_S, &save)) != NULL){
 249                 char *probe_path;
 250
 251                 x = NULL;
 252                 probe_path = g_build_path (G_DIR_SEPARATOR_S, l, program, NULL);
 253                 if (access (probe_path, X_OK) == 0){ /* FIXME: on windows this is just a read permissions test */
 254                         g_free (curdir);
 255                         g_free (p);
 256                         return probe_path;
 257                 }
 258                 g_free (probe_path);
 259
 260 #ifdef G_OS_WIN32
 261                 /* check for program with a suffix attached */
 262                 if (!hasSuffix) {
 263                         listx = 0;
 264                         while (suffix_list[listx]) {
 265                                 program_exe = g_strjoin(NULL,program,suffix_list[listx],NULL);
 266                                 probe_path = g_build_path (G_DIR_SEPARATOR_S, l, program_exe, NULL);
 267                                 if (access (probe_path, X_OK) == 0){ /* FIXME: on windows this is just a read permissions test */
 268                                         g_free (curdir);
 269                                         g_free (p);
 270                                         g_free (program_exe);
 271                                         return probe_path;
 272                                 }
 273                                 listx++;
 274                                 g_free (probe_path);
 275                                 g_free (program_exe);
 276                         }
 277                 }
 278 #endif
 279         }
 280         g_free (curdir);
 281         g_free (p);
 282         return NULL;
 283 }
 284
 285 static char *name;
 286
 287 void
 288 g_set_prgname (const gchar *prgname)
 289 {
 290         name = g_strdup (prgname);
 291 }
 292
 293 gchar *
 294 g_get_prgname (void)
 295 {
 296         return name;
 297 }
 298
 299 gboolean
 300 g_ensure_directory_exists (const gchar *filename)
 301 {
 302 #ifdef G_OS_WIN32
 303         gchar *dir_utf8 = g_path_get_dirname (filename);
 304         gunichar2 *p;
 305         gunichar2 *dir_utf16 = NULL;
 306         int retval;
 307
 308         if (!dir_utf8 || !dir_utf8 [0])
 309                 return FALSE;
 310
 311         dir_utf16 = g_utf8_to_utf16 (dir_utf8, strlen (dir_utf8), NULL, NULL, NULL);
 312         g_free (dir_utf8);
 313
 314         if (!dir_utf16)
 315                 return FALSE;
 316
 317         p = dir_utf16;
 318
 319         /* make life easy and only use one directory seperator */
 320         while (*p != '\0')
 321         {
 322                 if (*p == '/')
 323                         *p = '\\';
 324                 p++;
 325         }
 326
 327         p = dir_utf16;
 328
 329         /* get past C:\ )*/
 330         while (*p++ != '\\')
 331         {
 332         }
 333
 334         while (1) {
 335                 gboolean bRet = FALSE;
 336                 p = wcschr (p, '\\');
 337                 if (p)
 338                         *p = '\0';
 339                 retval = _wmkdir (dir_utf16);
 340                 if (retval != 0 && errno != EEXIST) {
 341                         g_free (dir_utf16);
 342                         return FALSE;
 343                 }
 344                 if (!p)
 345                         break;
 346                 *p++ = '\\';
 347         }
 348
 349         g_free (dir_utf16);
 350         return TRUE;
 351 #else
 352         char *p;
 353         gchar *dir = g_path_get_dirname (filename);
 354         int retval;
 355         struct stat sbuf;
 356
 357         if (!dir || !dir [0]) {
 358                 g_free (dir);
 359                 return FALSE;
 360         }
 361
 362         if (stat (dir, &sbuf) == 0 && S_ISDIR (sbuf.st_mode)) {
 363                 g_free (dir);
 364                 return TRUE;
 365         }
 366
 367         p = dir;
 368         while (*p == '/')
 369                 p++;
 370
 371         while (1) {
 372                 p = strchr (p, '/');
 373                 if (p)
 374                         *p = '\0';
 375                 retval = mkdir (dir, 0777);
 376                 if (retval != 0 && errno != EEXIST) {
 377                         g_free (dir);
 378                         return FALSE;
 379                 }
 380                 if (!p)
 381                         break;
 382                 *p++ = '/';
 383         }
 384
 385         g_free (dir);
 386         return TRUE;
 387 #endif
 388 }
 389