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Diffstat (limited to 'examples/loadables/stat.c')
| -rw-r--r-- | examples/loadables/stat.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/examples/loadables/stat.c b/examples/loadables/stat.c new file mode 100644 index 0000000..1e60e7b --- /dev/null +++ b/examples/loadables/stat.c @@ -0,0 +1,464 @@ +/* stat - load up an associative array with stat information about a file */ + +/* See Makefile for compilation details. */ + +/* + Copyright (C) 2016,2022 Free Software Foundation, Inc. + + This file is part of GNU Bash. + Bash is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + Bash is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with Bash. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <config.h> + +#if defined (HAVE_UNISTD_H) +# include <unistd.h> +#endif + +#include <stdio.h> + +#include <sys/types.h> +#include "posixstat.h" +#include <stdio.h> +#include <pwd.h> +#include <grp.h> +#include <errno.h> +#include "posixtime.h" + +#include "bashansi.h" +#include "shell.h" +#include "builtins.h" +#include "common.h" +#include "bashgetopt.h" + +#ifndef errno +extern int errno; +#endif + +#define ST_NAME 0 +#define ST_DEV 1 +#define ST_INO 2 +#define ST_MODE 3 +#define ST_NLINK 4 +#define ST_UID 5 +#define ST_GID 6 +#define ST_RDEV 7 +#define ST_SIZE 8 +#define ST_ATIME 9 +#define ST_MTIME 10 +#define ST_CTIME 11 +#define ST_BLKSIZE 12 +#define ST_BLOCKS 13 +#define ST_CHASELINK 14 +#define ST_PERMS 15 + +#define ST_END 16 + +static char *arraysubs[] = + { + "name", "device", "inode", "type", "nlink", "uid", "gid", "rdev", + "size", "atime", "mtime", "ctime", "blksize", "blocks", "link", "perms", + 0 + }; + +#define DEFTIMEFMT "%a %b %e %k:%M:%S %Z %Y" +#ifndef TIMELEN_MAX +# define TIMELEN_MAX 128 +#endif + +static char *stattime (time_t, const char *); + +static int +getstat (fname, flags, sp) + const char *fname; + int flags; + struct stat *sp; +{ + intmax_t lfd; + int fd, r; + + if (strncmp (fname, "/dev/fd/", 8) == 0) + { + if ((legal_number(fname + 8, &lfd) == 0) || (int)lfd != lfd) + { + errno = EINVAL; + return -1; + } + fd = lfd; + r = fstat(fd, sp); + } +#ifdef HAVE_LSTAT + else if (flags & 1) + r = lstat(fname, sp); +#endif + else + r = stat(fname, sp); + + return r; +} + +static char * +statlink (fname, sp) + char *fname; + struct stat *sp; +{ +#if defined (HAVE_READLINK) + char linkbuf[PATH_MAX]; + int n; + + if (fname && S_ISLNK (sp->st_mode) && (n = readlink (fname, linkbuf, PATH_MAX)) > 0) + { + linkbuf[n] = '\0'; + return (savestring (linkbuf)); + } + else +#endif + return (savestring (fname)); +} + +static char * +octalperms (m) + int m; +{ + int operms; + char *ret; + + operms = 0; + + if (m & S_IRUSR) + operms |= 0400; + if (m & S_IWUSR) + operms |= 0200; + if (m & S_IXUSR) + operms |= 0100; + + if (m & S_IRGRP) + operms |= 0040; + if (m & S_IWGRP) + operms |= 0020; + if (m & S_IXGRP) + operms |= 0010; + + if (m & S_IROTH) + operms |= 0004; + if (m & S_IWOTH) + operms |= 0002; + if (m & S_IXOTH) + operms |= 0001; + + if (m & S_ISUID) + operms |= 04000; + if (m & S_ISGID) + operms |= 02000; + if (m & S_ISVTX) + operms |= 01000; + + ret = (char *)xmalloc (16); + snprintf (ret, 16, "%04o", operms); + return ret; +} + +static char * +statperms (m) + int m; +{ + char ubits[4], gbits[4], obits[4]; /* u=rwx,g=rwx,o=rwx */ + int i; + char *ret; + + i = 0; + if (m & S_IRUSR) + ubits[i++] = 'r'; + if (m & S_IWUSR) + ubits[i++] = 'w'; + if (m & S_IXUSR) + ubits[i++] = 'x'; + ubits[i] = '\0'; + + i = 0; + if (m & S_IRGRP) + gbits[i++] = 'r'; + if (m & S_IWGRP) + gbits[i++] = 'w'; + if (m & S_IXGRP) + gbits[i++] = 'x'; + gbits[i] = '\0'; + + i = 0; + if (m & S_IROTH) + obits[i++] = 'r'; + if (m & S_IWOTH) + obits[i++] = 'w'; + if (m & S_IXOTH) + obits[i++] = 'x'; + obits[i] = '\0'; + + if (m & S_ISUID) + ubits[2] = (m & S_IXUSR) ? 's' : 'S'; + if (m & S_ISGID) + gbits[2] = (m & S_IXGRP) ? 's' : 'S'; + if (m & S_ISVTX) + obits[2] = (m & S_IXOTH) ? 't' : 'T'; + + ret = (char *)xmalloc (32); + snprintf (ret, 32, "u=%s,g=%s,o=%s", ubits, gbits, obits); + return ret; +} + +static char * +statmode(mode) + int mode; +{ + char *modestr, *m; + + modestr = m = (char *)xmalloc (8); + if (S_ISBLK (mode)) + *m++ = 'b'; + if (S_ISCHR (mode)) + *m++ = 'c'; + if (S_ISDIR (mode)) + *m++ = 'd'; + if (S_ISREG(mode)) + *m++ = '-'; + if (S_ISFIFO(mode)) + *m++ = 'p'; + if (S_ISLNK(mode)) + *m++ = 'l'; + if (S_ISSOCK(mode)) + *m++ = 's'; + +#ifdef S_ISDOOR + if (S_ISDOOR (mode)) + *m++ = 'D'; +#endif +#ifdef S_ISWHT + if (S_ISWHT(mode)) + *m++ = 'W'; +#endif +#ifdef S_ISNWK + if (S_ISNWK(mode)) + *m++ = 'n'; +#endif +#ifdef S_ISMPC + if (S_ISMPC (mode)) + *m++ = 'm'; +#endif + + *m = '\0'; + return (modestr); +} + +static char * +stattime (t, timefmt) + time_t t; + const char *timefmt; +{ + char *tbuf, *ret; + const char *fmt; + size_t tlen; + struct tm *tm; + + fmt = timefmt ? timefmt : DEFTIMEFMT; + tm = localtime (&t); + + ret = xmalloc (TIMELEN_MAX); + + tlen = strftime (ret, TIMELEN_MAX, fmt, tm); + if (tlen == 0) + tlen = strftime (ret, TIMELEN_MAX, DEFTIMEFMT, tm); + + return ret; +} + +static char * +statval (which, fname, flags, fmt, sp) + int which; + char *fname; + int flags; + char *fmt; + struct stat *sp; +{ + int temp; + + switch (which) + { + case ST_NAME: + return savestring (fname); + case ST_DEV: + return itos (sp->st_dev); + case ST_INO: + return itos (sp->st_ino); + case ST_MODE: + return (statmode (sp->st_mode)); + case ST_NLINK: + return itos (sp->st_nlink); + case ST_UID: + return itos (sp->st_uid); + case ST_GID: + return itos (sp->st_gid); + case ST_RDEV: + return itos (sp->st_rdev); + case ST_SIZE: + return itos (sp->st_size); + case ST_ATIME: + return ((flags & 2) ? stattime (sp->st_atime, fmt) : itos (sp->st_atime)); + case ST_MTIME: + return ((flags & 2) ? stattime (sp->st_mtime, fmt) : itos (sp->st_mtime)); + case ST_CTIME: + return ((flags & 2) ? stattime (sp->st_ctime, fmt) : itos (sp->st_ctime)); + case ST_BLKSIZE: + return itos (sp->st_blksize); + case ST_BLOCKS: + return itos (sp->st_blocks); + case ST_CHASELINK: + return (statlink (fname, sp)); + case ST_PERMS: + temp = sp->st_mode & (S_IRWXU|S_IRWXG|S_IRWXO|S_ISUID|S_ISGID); + return (flags & 2) ? statperms (temp) : octalperms (temp); + default: + return savestring ("42"); + } +} + +static int +loadstat (vname, var, fname, flags, fmt, sp) + char *vname; + SHELL_VAR *var; + char *fname; + int flags; + char *fmt; + struct stat *sp; +{ + int i; + char *key, *value; + SHELL_VAR *v; + + for (i = 0; arraysubs[i]; i++) + { + key = savestring (arraysubs[i]); + value = statval (i, fname, flags, fmt, sp); + v = bind_assoc_variable (var, vname, key, value, ASS_FORCE); + } + return 0; +} + +int +stat_builtin (list) + WORD_LIST *list; +{ + int opt, flags; + char *aname, *fname, *timefmt; + struct stat st; + SHELL_VAR *v; + + aname = "STAT"; + flags = 0; + timefmt = 0; + + reset_internal_getopt (); + while ((opt = internal_getopt (list, "A:F:Ll")) != -1) + { + switch (opt) + { + case 'A': + aname = list_optarg; + break; + case 'L': + flags |= 1; /* operate on links rather than resolving them */ + break; + case 'l': + flags |= 2; + break; + case 'F': + timefmt = list_optarg; + break; + CASE_HELPOPT; + default: + builtin_usage (); + return (EX_USAGE); + } + } + + if (legal_identifier (aname) == 0) + { + sh_invalidid (aname); + return (EXECUTION_FAILURE); + } + + list = loptend; + if (list == 0) + { + builtin_usage (); + return (EX_USAGE); + } + + +#if 0 + unbind_variable (aname); +#endif + fname = list->word->word; + + if (getstat (fname, flags, &st) < 0) + { + builtin_error ("%s: cannot stat: %s", fname, strerror (errno)); + return (EXECUTION_FAILURE); + } + + v = find_or_make_array_variable (aname, 3); + if (v == 0) + { + builtin_error ("%s: cannot create variable", aname); + return (EXECUTION_FAILURE); + } + if (loadstat (aname, v, fname, flags, timefmt, &st) < 0) + { + builtin_error ("%s: cannot assign file status information", aname); + unbind_variable (aname); + return (EXECUTION_FAILURE); + } + + return (EXECUTION_SUCCESS); +} + +/* An array of strings forming the `long' documentation for a builtin xxx, + which is printed by `help xxx'. It must end with a NULL. By convention, + the first line is a short description. */ +char *stat_doc[] = { + "Load an associative array with file status information.", + "", + "Take a filename and load the status information returned by a", + "stat(2) call on that file into the associative array specified", + "by the -A option. The default array name is STAT.", + "", + "If the -L option is supplied, stat does not resolve symbolic links", + "and reports information about the link itself. The -l option results", + "in longer-form listings for some of the fields. When -l is used,", + "the -F option supplies a format string passed to strftime(3) to", + "display the file time information.", + "The exit status is 0 unless the stat fails or assigning the array", + "is unsuccessful.", + (char *)NULL +}; + +/* The standard structure describing a builtin command. bash keeps an array + of these structures. The flags must include BUILTIN_ENABLED so the + builtin can be used. */ +struct builtin stat_struct = { + "stat", /* builtin name */ + stat_builtin, /* function implementing the builtin */ + BUILTIN_ENABLED, /* initial flags for builtin */ + stat_doc, /* array of long documentation strings. */ + "stat [-lL] [-A aname] file", /* usage synopsis; becomes short_doc */ + 0 /* reserved for internal use */ +}; |