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/*
* Find file name from locatedb database.
*
* Compile and run updatedb command first to create locate.db file. Then,
* compile this program with Visual Studio and run the program in console with
* a file name argument. For example, the command
*
* locate autoexec
*
* might output something like
*
* c:/AUTOEXEC.BAT
* c:/WINDOWS/repair/autoexec.nt
* c:/WINDOWS/system32/AUTOEXEC.NT
*
* Be ware that this file uses wide-character API which is not compatible
* with Linux or other major Unixes.
*
* Copyright (C) 1998-2019 Toni Ronkko
* This file is part of dirent. Dirent may be freely distributed
* under the MIT license. For all details and documentation, see
* https://github.com/tronkko/dirent
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#ifdef WIN32
# include <io.h>
# include <fcntl.h>
#endif
#include <dirent.h>
/* File name and location of database file */
#define DB_LOCATION L"locate.db"
/* Forward-decl */
static int db_locate(const wchar_t *pattern);
static int db_match(const wchar_t *fn, const wchar_t *pattern);
static void db_open(void);
static void db_close(void);
static int db_read(wchar_t *buffer, size_t max);
/* Module local variables */
static FILE *db = NULL;
#ifdef _MSC_VER
int
wmain(int argc, wchar_t *argv[])
{
/* Prepare for unicode output */
_setmode(_fileno(stdout), _O_U16TEXT);
/* For each pattern in command line */
int i = 1;
while (i < argc) {
int count = 0;
/* Find files matching pattern */
count = db_locate(argv[i]);
/* Output warning if string is not found */
if (count == 0) {
wprintf(L"%s not found\n", argv[i]);
}
i++;
}
if (argc < 2) {
wprintf(L"Usage: locate pattern\n");
exit(EXIT_FAILURE);
}
return EXIT_SUCCESS;
}
#else
int
main(int argc, char *argv[])
{
printf("locate only works on Microsoft Windows\n");
return EXIT_SUCCESS;
}
#endif
/* Match pattern against files in locate.db file */
static int
db_locate(const wchar_t *pattern)
{
int count = 0;
#ifdef WIN32
wchar_t buffer[PATH_MAX + 1];
/* Open locate.db for read */
db_open();
/* Read one directory and file name at a time from database file */
while (db_read(buffer, PATH_MAX + 1)) {
/* See if file name in buffer matches the search pattern */
if (db_match(buffer, pattern)) {
/* Match found => output file name and path */
wprintf(L"%s\n", buffer);
count++;
}
}
db_close();
#endif
return count;
}
/* Match pattern against file name */
static int
db_match(const wchar_t *fn, const wchar_t *pattern)
{
int found = 0;
#ifdef WIN32
/* Locate zero-terminator from fn */
wchar_t *p = wcschr(fn, '\0');
/* Find base name from buffer */
int done = 0;
while (fn < p && !done) {
switch (p[-1]) {
case ':':
case '/':
case '\\':
/* Final path separator found */
done = 1;
break;
default:
/* No path separator yet */
p--;
}
}
/* Convert base name to lower case */
int i = 0;
wchar_t base[PATH_MAX + 1];
while (i < PATH_MAX && p[i] != '\0') {
base[i] = towlower(p[i]);
i++;
}
base[i] = '\0';
/* Convert search pattern to lower case */
i = 0;
wchar_t patt[PATH_MAX + 1];
while (i < PATH_MAX && pattern[i] != '\0') {
patt[i] = towlower(pattern[i]);
i++;
}
patt[i] = '\0';
/* See if file name matches pattern */
if (wcsstr(base, patt) != NULL) {
found = 1;
} else {
found = 0;
}
#endif
return found;
}
/*
* Read line from locate.db. This function is same as fgetws() except
* that new-line at the end of line is not included.
*/
static int
db_read(wchar_t *buffer, size_t max)
{
int ok = 0;
#ifdef WIN32
size_t i = 0;
wchar_t c;
int done = 0;
if (!db) {
wprintf(L"Database not open\n");
exit(EXIT_SUCCESS);
}
do {
/* Read wide-character from stream */
c = fgetwc(db);
/* Determine how to process character */
switch (c) {
case '\r':
/* Ignore, should be handled by run-time libraries */
/*NOP*/;
break;
case '\n':
/* End of string => return file name */
done = 1;
ok = 1;
break;
case /*EOF*/WEOF:
/* End of file */
done = 1;
if (i == 0) {
/* No data in buffer => return false */
ok = 0;
} else {
/* Data in buffer => return file name */
ok = 1;
}
break;
default:
/* Store character */
if (i < max - 1) {
buffer[i++] = c;
} else {
buffer[max - 1] = '\0';
wprintf(L"Buffer too small: %s", buffer);
exit(EXIT_FAILURE);
}
}
} while (!done);
/* Zero-terminate buffer */
buffer[i] = '\0';
#endif
return ok;
}
/* Open database file locate.db */
static void
db_open(void)
{
#ifdef WIN32
if (db)
return;
/* Open file for writing */
errno_t error = _wfopen_s(&db, DB_LOCATION, L"rt, ccs=UNICODE");
if (error) {
wprintf(L"Cannot open %s\n", DB_LOCATION);
exit(EXIT_FAILURE);
}
#endif
}
/* Close database file */
static void
db_close(void)
{
if (!db)
return;
fclose(db);
db = NULL;
}
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