Add _cdio_strdup_fixpath for absolute paths handling in MinGW

* MinGW may provide absolute paths in the form /c/directory/...
  to native calls that require instead c:/directory

include/cdio/util.h

@@ -99,6 +99,12 @@ _cdio_memdup (const void *mem, size_t count);
 char *
 _cdio_strdup_upper (const char str[]);
 
+/* Duplicate path and make it platform compliant. Typically needed for
+   MinGW/MSYS where a "/c/..." path must be translated to "c:/..." for
+   use with fopen(), etc. Returned string must be freed by the caller. */
+char * 
+_cdio_strdup_fixpath (const char path[]);
+
 void
 _cdio_strfreev(char **strv);
 

lib/driver/_cdio_stdio.c

@@ -225,17 +225,27 @@ cdio_stdio_new(const char pathname[])
   cdio_stream_io_functions funcs = { NULL, NULL, NULL, NULL, NULL, NULL };
   _UserData *ud = NULL;
   struct CDIO_STAT statbuf;
-  
-  if (CDIO_STAT (pathname, &statbuf) == -1) 
+  char* pathdup;
+
+  if (pathname == NULL)
+    return NULL;
+
+  /* MinGW may require a translated path */
+  pathdup = _cdio_strdup_fixpath(pathname);
+  if (pathdup == NULL)
+    return NULL;
+
+  if (CDIO_STAT (pathdup, &statbuf) == -1) 
     {
       cdio_warn ("could not retrieve file info for `%s': %s", 
-                 pathname, strerror (errno));
+                 pathdup, strerror (errno));
+      free(pathdup);
       return NULL;
     }
 
   ud = calloc (1, sizeof (_UserData));
 
-  ud->pathname = strdup(pathname);
+  ud->pathname = pathdup;
   ud->st_size  = statbuf.st_size; /* let's hope it doesn't change... */
 
   funcs.open   = _stdio_open;

lib/driver/image/bincue.c

@@ -251,7 +251,7 @@ parse_cuefile (_img_private_t *cd, const char *psz_cue_name)
   unsigned int i_line=0;            /* line number in file of psz_line. */
   int          i = -1;              /* Position in tocent. Same as 
 				       cd->gen.i_tracks - 1 */
-  char *psz_keyword, *psz_field;
+  char *psz_keyword, *psz_field, *psz_cue_name_dup;
   cdio_log_level_t log_level = (NULL == cd) ? CDIO_LOG_INFO : CDIO_LOG_WARN;
   cdtext_field_t cdtext_key;
 
@@ -261,8 +261,13 @@ parse_cuefile (_img_private_t *cd, const char *psz_cue_name)
 
   if (NULL == psz_cue_name) 
     return false;
-  
-  fp = fopen (psz_cue_name, "r");
+
+  psz_cue_name_dup = _cdio_strdup_fixpath(psz_cue_name);
+  if (NULL == psz_cue_name_dup) 
+    return false;
+
+  fp = fopen (psz_cue_name_dup, "r");
+  free(psz_cue_name_dup);
   if (fp == NULL) {
     cdio_log(log_level, "error opening %s for reading: %s", 
 	     psz_cue_name, strerror(errno));

lib/driver/image/cdrdao.c

@@ -298,7 +298,7 @@ parse_tocfile (_img_private_t *cd, const char *psz_cue_name)
   unsigned int i_line=0;            /* line number in file of psz_line. */
   int          i = -1;              /* Position in tocent. Same as 
 				       cd->gen.i_tracks - 1 */
-  char *psz_keyword, *psz_field;
+  char *psz_keyword, *psz_field, *psz_cue_name_dup;
   cdio_log_level_t log_level = (cd) ? CDIO_LOG_WARN : CDIO_LOG_INFO ;
   cdtext_field_t cdtext_key;
 
@@ -307,8 +307,13 @@ parse_tocfile (_img_private_t *cd, const char *psz_cue_name)
 
   if (NULL == psz_cue_name) 
     return false;
-  
-  fp = fopen (psz_cue_name, "r");
+
+  psz_cue_name_dup = _cdio_strdup_fixpath(psz_cue_name);
+  if (NULL == psz_cue_name_dup) 
+    return false;
+
+  fp = fopen (psz_cue_name_dup, "r");
+  free(psz_cue_name_dup);
   if (fp == NULL) {
     cdio_log(log_level, "error opening %s for reading: %s", 
 	     psz_cue_name, strerror(errno));

lib/driver/util.c

@@ -38,6 +38,8 @@
 #include "inttypes.h"
 #endif
 
+#include <ctype.h>
+
 #include "cdio_assert.h"
 #include <cdio/types.h>
 #include <cdio/util.h>
@@ -136,6 +138,29 @@ _cdio_strdup_upper (const char str[])
   return new_str;
 }
 
+/* Convert MinGW/MSYS paths that start in "/c/..." to "c:/..."
+   so that they can be used with fopen(), stat(), etc. */
+char * 
+_cdio_strdup_fixpath (const char path[])
+{
+  char *new_path = NULL;
+
+  if (path)
+    {
+       new_path = strdup (path);
+#if defined(_WIN32)
+       if (new_path && (strlen (new_path) >= 3) && (new_path[0] == '/') &&
+          (new_path[2] == '/') && (isalpha (new_path[1])))
+         {
+           new_path[0] = new_path[1];
+           new_path[1] = ':';
+         }
+#endif
+    }
+
+  return new_path;
+}
+
 uint8_t
 cdio_to_bcd8 (uint8_t n)
 {