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
  33 #ifdef G_OS_WIN32
  34 #include <direct.h>
  35 #endif
  36
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40
  41 gchar *
  42 g_build_path (const gchar *separator, const gchar *first_element, ...)
  43 {
  44         GString *result;
  45         const char *s, *p, *next;
  46         size_t slen;
  47         va_list args;
  48
  49         g_return_val_if_fail (separator != NULL, NULL);
  50
  51         if (first_element == NULL)
  52                 return g_strdup ("");
  53
  54         result = g_string_sized_new (48);
  55
  56         slen = strlen (separator);
  57
  58         va_start (args, first_element);
  59         for (s = first_element; s != NULL; s = next){
  60                 next = va_arg (args, char *);
  61                 p = (s + strlen (s));
  62
  63                 if (next && p - slen > s){
  64                         for (; strncmp (p-slen, separator, slen) == 0; ){
  65                                 p -= slen;
  66                         }
  67                 }
  68                 g_string_append_len (result, s, p - s);
  69
  70                 if (next && *next){
  71                         if (strncmp (separator, result->str + strlen (result->str) - slen, slen))
  72                                 g_string_append (result, separator);
  73
  74                         for (; strncmp (next, separator, slen) == 0; )
  75                                 next += slen;
  76                 }
  77         }
  78         g_string_append_c (result, 0);
  79         va_end (args);
  80
  81         return g_string_free (result, FALSE);
  82 }
  83
  84 gchar *
  85 g_path_get_dirname (const gchar *filename)
  86 {
  87         char *p, *r;
  88         size_t count;
  89         g_return_val_if_fail (filename != NULL, NULL);
  90
  91         p = strrchr (filename, G_DIR_SEPARATOR);
  92         if (p == NULL)
  93                 return g_strdup (".");
  94         if (p == filename)
  95                 return g_strdup ("/");
  96         count = p - filename;
  97         r = g_malloc (count + 1);
  98         strncpy (r, filename, count);
  99         r [count] = 0;
 100
 101         return r;
 102 }
 103
 104 gchar *
 105 g_path_get_basename (const char *filename)
 106 {
 107         char *r;
 108         g_return_val_if_fail (filename != NULL, NULL);
 109
 110         /* Empty filename -> . */
 111         if (!*filename)
 112                 return g_strdup (".");
 113
 114         /* No separator -> filename */
 115         r = strrchr (filename, G_DIR_SEPARATOR);
 116         if (r == NULL)
 117                 return g_strdup (filename);
 118
 119         /* Trailing slash, remove component */
 120         if (r [1] == 0){
 121                 char *copy = g_strdup (filename);
 122                 copy [r-filename] = 0;
 123                 r = strrchr (copy, G_DIR_SEPARATOR);
 124
 125                 if (r == NULL){
 126                         g_free (copy);
 127                         return g_strdup ("/");
 128                 }
 129                 r = g_strdup (&r[1]);
 130                 g_free (copy);
 131                 return r;
 132         }
 133
 134         return g_strdup (&r[1]);
 135 }
 136
 137 #ifndef HAVE_STRTOK_R
 138 // This is from BSD's strtok_r
 139
 140 char *
 141 strtok_r(char *s, const char *delim, char **last)
 142 {
 143         char *spanp;
 144         int c, sc;
 145         char *tok;
 146
 147         if (s == NULL && (s = *last) == NULL)
 148                 return NULL;
 149
 150         /*
 151          * Skip (span) leading delimiters (s += strspn(s, delim), sort of).
 152          */
 153 cont:
 154         c = *s++;
 155         for (spanp = (char *)delim; (sc = *spanp++) != 0; ){
 156                 if (c == sc)
 157                         goto cont;
 158         }
 159
 160         if (c == 0){         /* no non-delimiter characters */
 161                 *last = NULL;
 162                 return NULL;
 163         }
 164         tok = s - 1;
 165
 166         /*
 167          * Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
 168          * Note that delim must have one NUL; we stop if we see that, too.
 169          */
 170         for (;;){
 171                 c = *s++;
 172                 spanp = (char *)delim;
 173                 do {
 174                         if ((sc = *spanp++) == c) {
 175                                 if (c == 0)
 176                                         s = NULL;
 177                                 else {
 178                                         char *w = s - 1;
 179                                         *w = '\0';
 180                                 }
 181                                 *last = s;
 182                                 return tok;
 183                         }
 184                 }
 185                 while (sc != 0);
 186         }
 187         /* NOTREACHED */
 188 }
 189 #endif
 190
 191 gchar *
 192 g_find_program_in_path (const gchar *program)
 193 {
 194         char *p = g_strdup (g_getenv ("PATH"));
 195         char *x = p, *l;
 196         gchar *curdir = NULL;
 197         char *save;
 198
 199         g_return_val_if_fail (program != NULL, NULL);
 200
 201         if (x == NULL || *x == '\0') {
 202                 curdir = g_get_current_dir ();
 203                 x = curdir;
 204         }
 205
 206         while ((l = strtok_r (x, G_SEARCHPATH_SEPARATOR_S, &save)) != NULL){
 207                 char *probe_path;
 208
 209                 x = NULL;
 210                 probe_path = g_build_path (G_DIR_SEPARATOR_S, l, program, NULL);
 211                 if (access (probe_path, X_OK) == 0){ /* FIXME: on windows this is just a read permissions test */
 212                         g_free (curdir);
 213                         g_free (p);
 214                         return probe_path;
 215                 }
 216                 g_free (probe_path);
 217         }
 218         g_free (curdir);
 219         g_free (p);
 220         return NULL;
 221 }
 222
 223 static char *name;
 224
 225 void
 226 g_set_prgname (const gchar *prgname)
 227 {
 228         name = g_strdup (prgname);
 229 }
 230
 231 gchar *
 232 g_get_prgname (void)
 233 {
 234         return name;
 235 }