127 lines
3.3 KiB
C
127 lines
3.3 KiB
C
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2015.
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This program is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>.
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find.c
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Locate files and directories.
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*******************************************************************************/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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char* AddElemToPath(const char* path, const char* elem)
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{
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size_t pathlen = strlen(path);
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size_t elemlen = strlen(elem);
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if ( pathlen && path[pathlen-1] == '/' )
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{
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char* ret = (char*) malloc(sizeof(char) * (pathlen + elemlen + 1));
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stpcpy(stpcpy(ret, path), elem);
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return ret;
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}
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char* ret = (char*) malloc(sizeof(char) * (pathlen + 1 + elemlen + 1));
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stpcpy(stpcpy(stpcpy(ret, path), "/"), elem);
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return ret;
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}
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static const int TYPE_FILE = 1 << 0;
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static const int TYPE_DIR = 1 << 1;
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bool Find(int dirfd, const char* relpath, const char* path, int types)
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{
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bool ret = true;
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int fd = openat(dirfd, relpath, O_RDONLY | O_SYMLINK_NOFOLLOW);
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if ( fd < 0 ) { error(0, errno, "%s", path); return false; }
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struct stat st;
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if ( fstat(fd, &st) ) { error(0, errno, "stat: %s", path); return false; }
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if ( S_ISDIR(st.st_mode) )
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{
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if ( types & TYPE_DIR )
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printf("%s\n", path);
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DIR* dir = fdopendir(fd);
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if ( !dir ) { error(0, errno, "fdopendir"); close(fd); return false; }
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struct dirent* entry;
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while ( (entry = readdir(dir)) )
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{
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const char* name = entry->d_name;
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if ( !strcmp(name, ".") || !strcmp(name, "..") )
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continue;
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char* newpath = AddElemToPath(path, name);
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if ( !Find(fd, name, newpath, types) )
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{
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ret = false;
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break;
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}
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}
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closedir(dir);
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}
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else if ( S_ISREG(st.st_mode) )
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{
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if ( types & TYPE_FILE )
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printf("%s\n", path);
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}
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return ret;
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}
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int main(int argc, char* argv[])
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{
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const char* path = NULL;
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bool found_options = false;
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int types = 0;
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for ( int i = 1; i < argc; i++ )
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{
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const char* arg = argv[i];
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if ( arg[0] != '-' )
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{
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if ( found_options )
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error(1, 0, "path `%s' must come before options", arg);
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if ( path )
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error(1, 0, "multiple paths are not supported");
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path = arg;
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}
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else if ( !strcmp(arg, "-type") )
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{
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if ( i + 1 == argc )
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error(1, 0, "-type expects an argument");
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arg = argv[++i];
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if ( !strcmp(arg, "f") )
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types |= TYPE_FILE;
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else if ( !strcmp(arg, "d") )
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types |= TYPE_DIR;
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else
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error(1, 0, "unknown `-type %s'", arg);
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}
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else
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error(1, 0, "unknown option `%s'", arg);
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}
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if ( !path )
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path = ".";
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if ( !types )
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types = TYPE_FILE | TYPE_DIR;
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return Find(AT_FDCWD, path, path, types) ? 0 : 1;
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}
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