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libwine: Add a helper function to read a symlink. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2018-11-28 13:10:15 +01:00
parent ece6dfe52c
commit 27254d849b
1 changed files with 23 additions and 17 deletions
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40
libs/wine/config.c
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@ -54,9 +54,11 @@ static void fatal_perror( const char *err, ... ) __attribute__((noreturn,format
#endif
#if defined(__linux__) || defined(__FreeBSD_kernel__ )
#define EXE_LINK "/proc/self/exe"
static const char exe_link[] = "/proc/self/exe";
#elif defined (__FreeBSD__) || defined(__DragonFly__)
#define EXE_LINK "/proc/curproc/file"
static const char exe_link[] = "/proc/curproc/file";
#else
static const char exe_link[] = "";
#endif
/* die on a fatal error */
@ -151,30 +153,34 @@ static char *get_runtime_libdir(void)
return NULL;
}
/* return the directory that contains the main exe at run-time */
static char *get_runtime_exedir(void)
/* read a symlink and return its directory */
static char *symlink_dirname( const char *name )
{
#ifdef EXE_LINK
char *p, *bindir;
int size;
char *p, *buffer;
int ret, size;
for (size = 256; ; size *= 2)
{
int ret;
if (!(bindir = malloc( size ))) return NULL;
if ((ret = readlink( EXE_LINK, bindir, size )) == -1) break;
if (!(buffer = malloc( size ))) return NULL;
if ((ret = readlink( name, buffer, size )) == -1) break;
if (ret != size)
{
bindir[ret] = 0;
if (!(p = strrchr( bindir, '/' ))) break;
if (p == bindir) p++;
buffer[ret] = 0;
if (!(p = strrchr( buffer, '/' ))) break;
if (p == buffer) p++;
*p = 0;
return bindir;
return buffer;
}
free( bindir );
free( buffer );
}
free( bindir );
#endif
free( buffer );
return NULL;
}
/* return the directory that contains the main exe at run-time */
static char *get_runtime_exedir(void)
{
if (exe_link[0]) return symlink_dirname( exe_link );
return NULL;
}