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Calculate_relative_path(): fix when using symlinks

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Thomas BERNARD 2020-04-04 13:15:13 +02:00 committed by Thomas Bernard
parent 40fc2f2bee
commit 4ad13b57a8
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GPG Key ID: 0FF11B67A5C0863C
1 changed files with 26 additions and 16 deletions
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42
src/io.c
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@ -1131,6 +1131,7 @@ int Remove_directory(const char * path)
char * Calculate_relative_path(const char * ref_path, const char * path)
{
char * real_ref_path;
char * real_path;
char * rel_path = NULL;
int last_separator = -1;
int i;
@ -1142,67 +1143,75 @@ char * Calculate_relative_path(const char * ref_path, const char * path)
real_ref_path = Realpath(ref_path, NULL);
if (real_ref_path == NULL)
real_ref_path = strdup(ref_path);
real_path = Realpath(path, NULL);
if (real_path == NULL)
real_path = strdup(path);
#if defined(WIN32) || defined(__MINT__)
if (real_ref_path[1] == ':' && path[1] == ':')
if (real_ref_path[1] == ':' && real_path[1] == ':')
{
// use same case for drive letter
real_ref_path[0] = (real_ref_path[0] & ~32) | (path[0] & 32);
if (real_ref_path[0] != path[0])
real_ref_path[0] = (real_ref_path[0] & ~32) | (real_path[0] & 32);
if (real_ref_path[0] != real_path[0])
{
free(real_ref_path);
free(real_path);
return NULL; // path on different volumes, not possible
}
}
#endif
// look for common path parts
for (i = 0; real_ref_path[i] == path[i] && path[i] != '\0'; i++)
for (i = 0; real_ref_path[i] == real_path[i] && real_path[i] != '\0'; i++)
{
if (path[i] == PATH_SEPARATOR[0])
if (real_path[i] == PATH_SEPARATOR[0])
last_separator = i;
#if defined(WIN32)
else if(path[i] == '/')
else if(real_path[i] == '/')
last_separator = i;
#endif
}
// at this point, all chars from index 0 to i-1 are identical in
// real_ref_path and path.
// real_ref_path[i] and path[i] are either different, or both '\0'
if (real_ref_path[i] == PATH_SEPARATOR[0] && real_ref_path[i + 1] == '\0' && path[i] == '\0')
if (real_ref_path[i] == PATH_SEPARATOR[0] && real_ref_path[i + 1] == '\0' && real_path[i] == '\0')
{
free(real_ref_path);
free(real_path);
return strdup("."); // path are identical (real_ref_path has additional trailing separator)
}
if (real_ref_path[i] == '\0')
{
if (path[i] == '\0')
if (real_path[i] == '\0')
{
free(real_ref_path);
free(real_path);
return strdup("."); // path are identical
}
// path is under ref_path
if (path[i] == PATH_SEPARATOR[0])
if (real_path[i] == PATH_SEPARATOR[0])
{
free(real_ref_path);
len = strlen(path + i) + 1;
len = strlen(real_path + i) + 1;
rel_path = GFX2_malloc(len + 1);
if (rel_path != NULL)
snprintf(rel_path, len + 1, ".%s", path + i);
snprintf(rel_path, len + 1, ".%s", real_path + i);
free(real_path);
return rel_path;
}
else if (i > 0 && real_ref_path[i - 1] == PATH_SEPARATOR[0])
{
free(real_ref_path);
len = strlen(path + i - 1) + 1;
len = strlen(real_path + i - 1) + 1;
rel_path = GFX2_malloc(len + 1);
if (rel_path != NULL)
snprintf(rel_path, len + 1, ".%s", path + i - 1);
snprintf(rel_path, len + 1, ".%s", real_path + i - 1);
free(real_path);
return rel_path;
}
}
if (last_separator <= 0)
{
free(real_ref_path);
return strdup(path); // no common part found return absolute path
return real_path; // no common part found return absolute path
}
// count the number of path separators in the reference path
for (i = last_separator; real_ref_path[i] != '\0'; i++)
@ -1213,15 +1222,16 @@ char * Calculate_relative_path(const char * ref_path, const char * path)
free(real_ref_path);
i = 0;
// construct the relative path
len = separator_count * (2 + strlen(PATH_SEPARATOR)) + strlen(path + last_separator + 1) + 1;
len = separator_count * (2 + strlen(PATH_SEPARATOR)) + strlen(real_path + last_separator + 1) + 1;
rel_path = GFX2_malloc(len + 1);
if (rel_path != NULL)
{
while(separator_count-- > 0)
i += snprintf(rel_path + i, len + 1 - i, "..%s", PATH_SEPARATOR);
strncpy(rel_path + i, path + last_separator + 1, len + 1 - i);
strncpy(rel_path + i, real_path + last_separator + 1, len + 1 - i);
rel_path[len] = '\0';
}
free(real_path);
return rel_path;
}