136 lines
2.5 KiB
C
136 lines
2.5 KiB
C
/* chmod.c */
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#define COMMON_MODE
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#include "common.c"
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#define OPT_R 1
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/* chmod */
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static int _chmod_error(char * message, int ret);
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static int _chmod_do(mode_t mode, char * file);
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static int _chmod_do_recursive(int opts, mode_t mode, char * file);
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static int _chmod(int opts, mode_t mode, int filec, char * filev[])
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{
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int i;
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int res = 0;
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for(i = 0; i < filec; i++)
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if(opts & OPT_R)
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res += _chmod_do_recursive(opts, mode, filev[i]);
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else
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res += _chmod_do(mode, filev[i]);
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return res == 0 ? 0 : 2;
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}
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static int _chmod_error(char * message, int ret)
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{
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fprintf(stderr, "%s", "chmod: ");
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perror(message);
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return ret;
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}
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static int _chmod_do(mode_t mode, char * file)
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{
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if(chmod(file, mode) != 0)
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return _chmod_error(file, 1);
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return 0;
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}
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static int _chmod_do_recursive_do(int opts, mode_t mode, char * file);
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static int _chmod_do_recursive(int opts, mode_t mode, char * file)
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{
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struct stat st;
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if(lstat(file, &st) != 0)
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return _chmod_error(file, 1);
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if(!S_ISDIR(st.st_mode))
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return _chmod_do(mode, file);
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if(!S_ISLNK(st.st_mode))
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return _chmod_do_recursive_do(opts, mode, file);
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return 0;
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}
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static int _chmod_do_recursive_do(int opts, mode_t mode, char * file)
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{
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DIR * dir;
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struct dirent * de;
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int len;
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char * s;
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char * p;
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if((dir = opendir(file)) == NULL)
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return _chmod_error(file, 1);
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readdir(dir);
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readdir(dir);
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len = strlen(file);
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len += (len && file[len-1] == '/') ? 1 : 2;
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if((s = malloc(len)) == NULL)
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{
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closedir(dir);
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return _chmod_error(file, 1);
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}
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strcpy(s, file);
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s[len-2] = '/';
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s[len-1] = '\0';
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while((de = readdir(dir)) != NULL)
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{
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if((p = realloc(s, len + strlen(de->d_name))) == NULL)
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{
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_chmod_error("malloc", 0);
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continue;
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}
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s = p;
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strcat(s, de->d_name);
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_chmod_do_recursive(opts, mode, s);
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s[len-1] = '\0';
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}
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free(s);
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closedir(dir);
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return 0;
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}
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/* usage */
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static int _usage(void)
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{
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fprintf(stderr, "%s", "Usage: chmod [-R] mode file\n\
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-R recursively change file mode bits\n");
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return 1;
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}
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/* main */
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int main(int argc, char * argv[])
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{
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int opts = 0;
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mode_t mode;
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int o;
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while((o = getopt(argc, argv, "R")) != -1)
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switch(o)
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{
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case 'R':
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mode = OPT_R;
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break;
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default:
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return _usage();
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}
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if(argc - optind < 2)
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return _usage();
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if(_mode(argv[optind], &mode) != 0)
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return _usage();
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return _chmod(opts, mode, argc - optind - 1, &argv[optind+1]);
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}
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