diff options
Diffstat (limited to 'chmod.c')
| -rw-r--r-- | chmod.c | 163 |
1 files changed, 163 insertions, 0 deletions
@@ -0,0 +1,163 @@ +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/stat.h> +#include "internal.h" + +const char chmod_usage[] = "chmod [-R] mode file [file ...]\n" +"\nmode may be an octal integer representing the bit pattern for the\n" +"\tnew mode, or a symbolic value matching the pattern\n" +"\t[ugoa]{+|-|=}[rwxst] .\n" +"\t\tu:\tUser\n" +"\t\tg:\tGroup\n" +"\t\to:\tOthers\n" +"\t\ta:\tAll\n" +"\n" +"\n+:\tAdd privilege\n" +"\n-:\tRemove privilege\n" +"\n=:\tSet privilege\n" +"\n" +"\t\tr:\tRead\n" +"\t\tw:\tWrite\n" +"\t\tx:\tExecute\n" +"\t\ts:\tSet User ID\n" +"\t\tt:\t\"Sticky\" Text\n" +"\n" +"\tModes may be concatenated, as in \"u=rwx,g=rx,o=rx,-t,-s\n" +"\n" +"\t-R:\tRecursively change the mode of all files and directories\n" +"\t\tunder the argument directory."; + +int +parse_mode( + const char * s +,mode_t * or +,mode_t * and +,int * group_execute) +{ + /* [ugoa]{+|-|=}[rwxstl] */ + mode_t mode = 0; + mode_t groups = S_ISVTX; + char type; + char c; + + do { + for ( ; ; ) { + switch ( c = *s++ ) { + case '\0': + return -1; + case 'u': + groups |= S_ISUID|S_IRWXU; + continue; + case 'g': + groups |= S_ISGID|S_IRWXG; + continue; + case 'o': + groups |= S_IRWXO; + continue; + case 'a': + groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + continue; + case '+': + case '=': + case '-': + type = c; + if ( groups == S_ISVTX ) /* The default is "all" */ + groups |= S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + break; + default: + if ( c >= '0' && c <= '7' && mode == 0 && groups == S_ISVTX ) { + *and = 0; + *or = strtol(--s, 0, 010); + return 0; + } + else + return -1; + } + break; + } + + while ( (c = *s++) != '\0' ) { + switch ( c ) { + case ',': + break; + case 'r': + mode |= S_IRUSR|S_IRGRP|S_IROTH; + continue; + case 'w': + mode |= S_IWUSR|S_IWGRP|S_IWOTH; + continue; + case 'x': + mode |= S_IXUSR|S_IXGRP|S_IXOTH; + continue; + case 's': + if ( group_execute != 0 && (groups & S_IRWXG) ) { + if ( *group_execute < 0 ) + return -1; + if ( type != '-' ) { + mode |= S_IXGRP; + *group_execute = 1; + } + } + mode |= S_ISUID|S_ISGID; + continue; + case 'l': + if ( *group_execute > 0 ) + return -1; + if ( type != '-' ) { + *and &= ~S_IXGRP; + *group_execute = -1; + } + mode |= S_ISGID; + groups |= S_ISGID; + continue; + case 't': + mode |= S_ISVTX; + continue; + default: + return -1; + } + break; + } + switch ( type ) { + case '=': + *and &= ~(groups); + /* fall through */ + case '+': + *or |= mode & groups; + break; + case '-': + *and &= ~(mode & groups); + *or &= *and; + break; + } + } while ( c == ',' ); + return 0; +} + +extern int +chmod_main(struct FileInfo * i, int argc, char * * argv) +{ + i->andWithMode = S_ISVTX|S_ISUID|S_ISGID|S_IRWXU|S_IRWXG|S_IRWXO; + i->orWithMode = 0; + + while ( argc >= 3 ) { + if ( parse_mode(argv[1], &i->orWithMode, &i->andWithMode, 0) + == 0 ) { + argc--; + argv++; + } + else if ( strcmp(argv[1], "-R") == 0 ) { + i->recursive = 1; + argc--; + argv++; + } + else + break; + } + + i->changeMode = 1; + i->complainInPostProcess = 1; + + return monadic_main(i, argc, argv); +} |