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**
** zFilename must, for efficiency's sake, be a
** canonicalized/normalized name, e.g. using only '/' as directory
** separators.
**
** nFilename must be the strlen of zFilename. If it is negative,
** strlen() is used to calculate it.
**
** TODO: https://fossil-scm.org/sec2020/info/972cf9c302f5413f
** TL;DR: check for the -wal, -shm, -journal suffix forms of the db
** names.
const char *zEnd;
if(nFilename>=0 && nFilename<8/*strlen _FOSSIL_*/) return 0;
else if(nFilename<0) nFilename = (int)strlen(zFilename);
if(nFilename<8) return 0;
zEnd = zFilename + nFilename;
switch(zEnd[-1]){
case '_': {
return fossil_strcmp("_FOSSIL_", &zEnd[-8])
? 0 : (8==nFilename ? 1 : ('/'==zEnd[-9] ? 2 : 0));
}
case 't': {
return (nFilename<9
|| '.'!=zEnd[-9]
|| fossil_strcmp(".fslckout", &zEnd[-9]))
? 0 : (9==nFilename ? 1 : ('/'==zEnd[-10] ? 2 : 0));
}
default:
return 0;
}
}
/*
** COMMAND: test-is-ckout-db
**
** Usage: %fossil test-is-ckout-db FILENAMES...
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**
** zFilename must, for efficiency's sake, be a
** canonicalized/normalized name, e.g. using only '/' as directory
** separators.
**
** nFilename must be the strlen of zFilename. If it is negative,
** strlen() is used to calculate it.
*/
int filename_is_ckout_db(const char *zFilename, int nFilename){
const char *zEnd; /* one-after-the-end of zFilename */
int gotSuffix = 0; /* length of suffix (-wal, -shm, -journal) */
assert(zFilename && "API misuse");
if(nFilename<0) nFilename = (int)strlen(zFilename);
if(nFilename<8/*strlen _FOSSIL_*/) return 0;
zEnd = zFilename + nFilename;
if(nFilename>=12/*strlen _FOSSIL_-(shm|wal)*/){
/* Check for (-wal, -shm, -journal) suffixes, with an eye towards
** runtime speed. */
if('-'==zEnd[-4]){
if(fossil_stricmp("wal", &zEnd[-3])
&& fossil_stricmp("shm", &zEnd[-3])){
return 0;
}
gotSuffix = 4;
}else if(nFilename>=16/*strlen _FOSSIL_-journal*/ && '-'==zEnd[-8]){
if(fossil_stricmp("journal",&zEnd[-7])){
return 0;
}
gotSuffix = 8;
}
if(gotSuffix){
assert(4==gotSuffix || 8==gotSuffix);
zEnd -= gotSuffix;
nFilename -= gotSuffix;
gotSuffix = 1;
}
assert(nFilename>=8 && "strlen _FOSSIL_");
assert(gotSuffix==0 || gotSuffix==1);
}
switch(zEnd[-1]){
case '_': {
return fossil_strnicmp("_FOSSIL_", &zEnd[-8], 8)
? 0 : (8==nFilename
? 1
: ('/'==zEnd[-9] ? 2 : gotSuffix));
}
case 't': {
return (nFilename<9
|| '.'!=zEnd[-9]
|| fossil_strnicmp(".fslckout", &zEnd[-9], 9))
? 0 : (9==nFilename
? 1
: ('/'==zEnd[-10] ? 2 : gotSuffix));
}
default: {
return 0;
}
}
}
/*
** COMMAND: test-is-ckout-db
**
** Usage: %fossil test-is-ckout-db FILENAMES...
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