Fossil SCM

Part 1 of ticket [980a72dedd]: efficient check for determining whether a filename ends with a checkout db name.

stephan 2020-08-17 15:17 trunk

Commit ddd1273ea2358dd9882bb296346f63a2ad55ccccda798928ac9eb25e54a39f1a

Parent c840617b8b765da…

1 file changed +55

M src/db.c

+55

		--- src/db.c
		+++ src/db.c
		@@ -1704,10 +1704,65 @@
1704	1704	** a PRIMARY KEY that includes the new mhash column. However, we must have
1705	1705	** the repository database at hand in order to do the migration, so that
1706	1706	** step is deferred. */
1707	1707	return 1;
1708	1708	}
	1709	+
	1710	+/*
	1711	+** Returns true if the given filename ends with any of fossil's
	1712	+** checkout database filenames: _FOSSIL_ or .fslckout. Specifically,
	1713	+** it returns 1 if it's an exact match and 2 if it's the tail match
	1714	+** on a longer input.
	1715	+**
	1716	+** zFilename must, for efficiency's sake, be a
	1717	+** canonicalized/normalized name, e.g. using only '/' as directory
	1718	+** separators.
	1719	+**
	1720	+** nFilename must be the strlen of zFilename. If it is negative,
	1721	+** strlen() is used to calculate it.
	1722	+*/
	1723	+int is_fossil_ckout_db_name(const char *zFilename, int nFilename){
	1724	+ const char *zEnd;
	1725	+
	1726	+ if(nFilename>=0 && nFilename<8/strlen _FOSSIL_/) return 0;
	1727	+ else if(nFilename<0) nFilename = (int)strlen(zFilename);
	1728	+ if(nFilename<8) return 0;
	1729	+ zEnd = zFilename + nFilename;
	1730	+ switch(zEnd[-1]){
	1731	+ case '_':
	1732	+ return fossil_strcmp("_FOSSIL_", &zEnd[-8])
	1733	+ ? 0 : (8==nFilename ? 1 : ('/'==zEnd[-9] ? 2 : 0));
	1734	+ case 't':
	1735	+ return (nFilename<9
	1736	+ \|\| '.'!=zEnd[-9]
	1737	+ \|\| fossil_strcmp(".fslckout", &zEnd[-9]))
	1738	+ ? 0 : (9==nFilename ? 1 : ('/'==zEnd[-10] ? 2 : 0));
	1739	+ default:
	1740	+ return 0;
	1741	+ }
	1742	+}
	1743	+
	1744	+/*
	1745	+** COMMAND: test-is-ckout-db
	1746	+**
	1747	+** Usage: %fossil test-is-ckout-db FILENAMES...
	1748	+**
	1749	+** Passes each given name to is_fossil_ckout_db_name() and outputs one
	1750	+** line per file: the result value of that function followed by the
	1751	+** name.
	1752	+*/
	1753	+void test_is_ckout_name_cmd(void){
	1754	+ int i;
	1755	+
	1756	+ if(g.argc<3){
	1757	+ usage("FILENAME_1 [...FILENAME_N]");
	1758	+ }
	1759	+ for( i = 2; i < g.argc; ++i ){
	1760	+ const int check = is_fossil_ckout_db_name(g.argv[i], -1);
	1761	+ fossil_print("%d %s\n", check, g.argv[i]);
	1762	+ }
	1763	+}
1709	1764
1710	1765	/*
1711	1766	** Locate the root directory of the local repository tree. The root
1712	1767	** directory is found by searching for a file named "_FOSSIL_" or ".fslckout"
1713	1768	** that contains a valid repository database.
1714	1769

	--- src/db.c
	+++ src/db.c
	@@ -1704,10 +1704,65 @@
1704	** a PRIMARY KEY that includes the new mhash column. However, we must have
1705	** the repository database at hand in order to do the migration, so that
1706	** step is deferred. */
1707	return 1;
1708	}























































1709
1710	/*
1711	** Locate the root directory of the local repository tree. The root
1712	** directory is found by searching for a file named "_FOSSIL_" or ".fslckout"
1713	** that contains a valid repository database.
1714

	--- src/db.c
	+++ src/db.c
	@@ -1704,10 +1704,65 @@
1704	** a PRIMARY KEY that includes the new mhash column. However, we must have
1705	** the repository database at hand in order to do the migration, so that
1706	** step is deferred. */
1707	return 1;
1708	}
1709
1710	/*
1711	** Returns true if the given filename ends with any of fossil's
1712	** checkout database filenames: _FOSSIL_ or .fslckout. Specifically,
1713	** it returns 1 if it's an exact match and 2 if it's the tail match
1714	** on a longer input.
1715	**
1716	** zFilename must, for efficiency's sake, be a
1717	** canonicalized/normalized name, e.g. using only '/' as directory
1718	** separators.
1719	**
1720	** nFilename must be the strlen of zFilename. If it is negative,
1721	** strlen() is used to calculate it.
1722	*/
1723	int is_fossil_ckout_db_name(const char *zFilename, int nFilename){
1724	const char *zEnd;
1725
1726	if(nFilename>=0 && nFilename<8/strlen _FOSSIL_/) return 0;
1727	else if(nFilename<0) nFilename = (int)strlen(zFilename);
1728	if(nFilename<8) return 0;
1729	zEnd = zFilename + nFilename;
1730	switch(zEnd[-1]){
1731	case '_':
1732	return fossil_strcmp("_FOSSIL_", &zEnd[-8])
1733	? 0 : (8==nFilename ? 1 : ('/'==zEnd[-9] ? 2 : 0));
1734	case 't':
1735	return (nFilename<9
1736	\|\| '.'!=zEnd[-9]
1737	\|\| fossil_strcmp(".fslckout", &zEnd[-9]))
1738	? 0 : (9==nFilename ? 1 : ('/'==zEnd[-10] ? 2 : 0));
1739	default:
1740	return 0;
1741	}
1742	}
1743
1744	/*
1745	** COMMAND: test-is-ckout-db
1746	**
1747	** Usage: %fossil test-is-ckout-db FILENAMES...
1748	**
1749	** Passes each given name to is_fossil_ckout_db_name() and outputs one
1750	** line per file: the result value of that function followed by the
1751	** name.
1752	*/
1753	void test_is_ckout_name_cmd(void){
1754	int i;
1755
1756	if(g.argc<3){
1757	usage("FILENAME_1 [...FILENAME_N]");
1758	}
1759	for( i = 2; i < g.argc; ++i ){
1760	const int check = is_fossil_ckout_db_name(g.argv[i], -1);
1761	fossil_print("%d %s\n", check, g.argv[i]);
1762	}
1763	}
1764
1765	/*
1766	** Locate the root directory of the local repository tree. The root
1767	** directory is found by searching for a file named "_FOSSIL_" or ".fslckout"
1768	** that contains a valid repository database.
1769

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