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** Return TRUE if the given filename is canonical.
**
** Canonical names are full pathnames using "/" not "\" and which
** contain no "/./" or "/../" terms.
*/
int file_is_canonical(const char *z){
int i;
if( z[0]!='/'
if(
#if defined(_WIN32) || defined(__CYGWIN__)
&& (!fossil_isupper(z[0]) || z[1]!=':' || z[2]!='/')
!fossil_isupper(z[0]) || z[1]!=':' || !fossil_isdirsep(z[2])
#else
z[0]!='/'
#endif
) return 0;
for(i=0; z[i]; i++){
if( z[i]=='\\' ) return 0;
if( z[i]=='/' ){
if( z[i+1]=='.' ){
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