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zsh/Src/Modules/stat.c

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/*
* stat.c - stat builtin interface to system call
*
* This file is part of zsh, the Z shell.
*
* Copyright (c) 1996-1997 Peter Stephenson
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and to distribute modified versions of this software for any
* purpose, provided that the above copyright notice and the following
* two paragraphs appear in all copies of this software.
*
* In no event shall Peter Stephenson or the Zsh Development Group be liable
* to any party for direct, indirect, special, incidental, or consequential
* damages arising out of the use of this software and its documentation,
* even if Peter Stephenson and the Zsh Development Group have been advised of
* the possibility of such damage.
*
* Peter Stephenson and the Zsh Development Group specifically disclaim any
* warranties, including, but not limited to, the implied warranties of
* merchantability and fitness for a particular purpose. The software
* provided hereunder is on an "as is" basis, and Peter Stephenson and the
* Zsh Development Group have no obligation to provide maintenance,
* support, updates, enhancements, or modifications.
*
*/
#include "stat.mdh"
#include "stat.pro"
enum statnum { ST_DEV, ST_INO, ST_MODE, ST_NLINK, ST_UID, ST_GID,
ST_RDEV, ST_SIZE, ST_ATIM, ST_MTIM, ST_CTIM,
ST_BLKSIZE, ST_BLOCKS, ST_READLINK, ST_COUNT };
enum statflags { STF_NAME = 1, STF_FILE = 2, STF_STRING = 4, STF_RAW = 8,
STF_PICK = 16, STF_ARRAY = 32, STF_GMT = 64,
STF_HASH = 128, STF_OCTAL = 256 };
static char *statelts[] = { "device", "inode", "mode", "nlink",
"uid", "gid", "rdev", "size", "atime",
"mtime", "ctime", "blksize", "blocks",
"link", NULL };
#define HNAMEKEY "name"
/**/
static void
statmodeprint(mode_t mode, char *outbuf, int flags)
{
if (flags & STF_RAW) {
sprintf(outbuf, (flags & STF_OCTAL) ? "0%lo" : "%lu",
(unsigned long)mode);
if (flags & STF_STRING)
strcat(outbuf, " (");
}
if (flags & STF_STRING) {
static const char *modes = "?rwxrwxrwx";
#ifdef __CYGWIN__
static mode_t mflags[9] = { 0 };
#else
static const mode_t mflags[9] = {
S_IRUSR, S_IWUSR, S_IXUSR,
S_IRGRP, S_IWGRP, S_IXGRP,
S_IROTH, S_IWOTH, S_IXOTH
};
#endif
const mode_t *mfp = mflags;
char pm[11];
int i;
#ifdef __CYGWIN__
if (mflags[0] == 0) {
mflags[0] = S_IRUSR;
mflags[1] = S_IWUSR;
mflags[2] = S_IXUSR;
mflags[3] = S_IRGRP;
mflags[4] = S_IWGRP;
mflags[5] = S_IXGRP;
mflags[6] = S_IROTH;
mflags[7] = S_IWOTH;
mflags[8] = S_IXOTH;
}
#endif
if (S_ISBLK(mode))
*pm = 'b';
else if (S_ISCHR(mode))
*pm = 'c';
else if (S_ISDIR(mode))
*pm = 'd';
else if (S_ISDOOR(mode))
*pm = 'D';
else if (S_ISFIFO(mode))
*pm = 'p';
else if (S_ISLNK(mode))
*pm = 'l';
else if (S_ISMPC(mode))
*pm = 'm';
else if (S_ISNWK(mode))
*pm = 'n';
else if (S_ISOFD(mode))
*pm = 'M';
else if (S_ISOFL(mode))
*pm = 'M';
else if (S_ISREG(mode))
*pm = '-';
else if (S_ISSOCK(mode))
*pm = 's';
else
*pm = '?';
for (i = 1; i <= 9; i++)
pm[i] = (mode & *mfp++) ? modes[i] : '-';
pm[10] = '\0';
if (mode & S_ISUID)
pm[3] = (mode & S_IXUSR) ? 's' : 'S';
if (mode & S_ISGID)
pm[6] = (mode & S_IXGRP) ? 's' : 'S';
if (mode & S_ISVTX)
pm[9] = (mode & S_IXOTH) ? 't' : 'T';
pm[10] = 0;
strcat(outbuf, pm);
if (flags & STF_RAW)
strcat(outbuf, ")");
}
}
/**/
static void
statuidprint(uid_t uid, char *outbuf, int flags)
{
if (flags & STF_RAW) {
sprintf(outbuf, "%lu", (unsigned long)uid);
if (flags & STF_STRING)
strcat(outbuf, " (");
}
if (flags & STF_STRING) {
#ifdef HAVE_GETPWUID
struct passwd *pwd;
pwd = getpwuid(uid);
if (pwd)
strcat(outbuf, pwd->pw_name);
else
#endif /* !HAVE_GETPWUID */
{
char *optr;
for (optr = outbuf; *optr; optr++)
;
sprintf(optr, "%lu", (unsigned long)uid);
}
if (flags & STF_RAW)
strcat(outbuf, ")");
}
}
/**/
static void
statgidprint(gid_t gid, char *outbuf, int flags)
{
if (flags & STF_RAW) {
sprintf(outbuf, "%lu", (unsigned long)gid);
if (flags & STF_STRING)
strcat(outbuf, " (");
}
if (flags & STF_STRING) {
#ifdef USE_GETGRGID
struct group *gr;
gr = getgrgid(gid);
if (gr)
strcat(outbuf, gr->gr_name);
else
#endif /* !USE_GETGRGID */
{
char *optr;
for (optr = outbuf; *optr; optr++)
;
sprintf(optr, "%lu", (unsigned long)gid);
}
if (flags & STF_RAW)
strcat(outbuf, ")");
}
}
static char *timefmt;
/**/
static void
stattimeprint(time_t tim, char *outbuf, int flags)
{
if (flags & STF_RAW) {
sprintf(outbuf, "%ld", (unsigned long)tim);
if (flags & STF_STRING)
strcat(outbuf, " (");
}
if (flags & STF_STRING) {
char *oend = outbuf + strlen(outbuf);
ztrftime(oend, 40, timefmt, (flags & STF_GMT) ? gmtime(&tim) :
localtime(&tim));
if (flags & STF_RAW)
strcat(oend, ")");
}
}
/**/
static void
statulprint(unsigned long num, char *outbuf)
{
sprintf(outbuf, "%lu", num);
}
/**/
static void
statlinkprint(struct stat *sbuf, char *outbuf, char *fname)
{
int num;
/* fname is NULL if we are looking at an fd */
if (fname && S_ISLNK(sbuf->st_mode) &&
(num = readlink(fname, outbuf, PATH_MAX)) > 0) {
/* readlink doesn't terminate the buffer itself */
outbuf[num] = '\0';
}
}
/**/
static void
statprint(struct stat *sbuf, char *outbuf, char *fname, int iwhich, int flags)
{
char *optr = outbuf;
if (flags & STF_NAME) {
sprintf(outbuf, (flags & (STF_PICK|STF_ARRAY)) ?
"%s " : "%-8s", statelts[iwhich]);
optr += strlen(outbuf);
}
*optr = '\0';
/* cast values to unsigned long as safest bet */
switch (iwhich) {
case ST_DEV:
statulprint((unsigned long)sbuf->st_dev, optr);
break;
case ST_INO:
#ifdef INO_T_IS_64_BIT
convbase(optr, sbuf->st_ino, 0);
#else
DPUTS(sizeof(sbuf->st_ino) > sizeof(unsigned long),
"Shell compiled with wrong ino_t size");
statulprint((unsigned long)sbuf->st_ino, optr);
#endif
break;
case ST_MODE:
statmodeprint(sbuf->st_mode, optr, flags);
break;
case ST_NLINK:
statulprint((unsigned long)sbuf->st_nlink, optr);
break;
case ST_UID:
statuidprint(sbuf->st_uid, optr, flags);
break;
case ST_GID:
statgidprint(sbuf->st_gid, optr, flags);
break;
case ST_RDEV:
statulprint((unsigned long)sbuf->st_rdev, optr);
break;
case ST_SIZE:
#ifdef OFF_T_IS_64_BIT
convbase(optr, sbuf->st_size, 0);
#else
DPUTS(sizeof(sbuf->st_size) > sizeof(unsigned long),
"Shell compiled with wrong off_t size");
statulprint((unsigned long)sbuf->st_size, optr);
#endif
break;
case ST_ATIM:
stattimeprint(sbuf->st_atime, optr, flags);
break;
case ST_MTIM:
stattimeprint(sbuf->st_mtime, optr, flags);
break;
case ST_CTIM:
stattimeprint(sbuf->st_ctime, optr, flags);
break;
case ST_BLKSIZE:
statulprint((unsigned long)sbuf->st_blksize, optr);
break;
case ST_BLOCKS:
statulprint((unsigned long)sbuf->st_blocks, optr);
break;
case ST_READLINK:
statlinkprint(sbuf, optr, fname);
break;
case ST_COUNT: /* keep some compilers happy */
break;
}
}
/*
*
* Options:
* -f fd: stat fd instead of file
* -g: use GMT rather than local time for time strings (forces -s on).
* -n: always print file name of file being statted
* -N: never print file name
* -l: list stat types
* -L: do lstat (else links are implicitly dereferenced by stat)
* -t: always print name of stat type
* -T: never print name of stat type
* -r: print raw alongside string data
* -s: string, print mode, times, uid, gid as appropriate strings:
* harmless but unnecessary when combined with -r.
* -A array: assign results to given array, one stat result per element.
* File names and type names are only added if explicitly requested:
* file names are returned as a separate array element, type names as
* prefix to element. Note the formatting deliberately contains
* fewer frills when -A is used.
* -H hash: as for -A array, but returns a hash with the keys being those
* from stat -l
* -F fmt: specify a $TIME-like format for printing times; the default
* is the (CTIME-like) "%a %b %e %k:%M:%S". This option implies
* -s as it is not useful for numerical times.
*
* +type selects just element type of stat buffer (-l gives list):
* type can be shortened to unambiguous string. only one type is
* allowed. The extra type, +link, reads the target of a symbolic
* link; it is empty if the stat was not an lstat or if
* a file descriptor was stat'd, if the stat'd file is
* not a symbolic link, or if symbolic links are not
* supported. If +link is explicitly requested, the -L (lstat)
* option is set automatically.
*/
/**/
static int
bin_stat(char *name, char **args, Options ops, UNUSED(int func))
{
char **aptr, *arrnam = NULL, **array = NULL, **arrptr = NULL;
char *hashnam = NULL, **hash = NULL, **hashptr = NULL;
int len, iwhich = -1, ret = 0, flags = 0, arrsize = 0, fd = 0;
struct stat statbuf;
int found = 0, nargs;
timefmt = "%a %b %e %k:%M:%S";
for (; *args && (**args == '+' || **args == '-'); args++) {
char *arg = *args+1;
if (!*arg || *arg == '-' || *arg == '+') {
args++;
break;
}
if (**args == '+') {
if (found)
break;
len = strlen(arg);
for (aptr = statelts; *aptr; aptr++)
if (!strncmp(*aptr, arg, len)) {
found++;
iwhich = aptr - statelts;
}
if (found > 1) {
zwarnnam(name, "%s: ambiguous stat element", arg, 0);
return 1;
} else if (found == 0) {
zwarnnam(name, "%s: no such stat element", arg, 0);
return 1;
}
/* if name of link requested, turn on lstat */
if (iwhich == ST_READLINK)
ops->ind['L'] = 1;
flags |= STF_PICK;
} else {
for (; *arg; arg++) {
if (strchr("glLnNorstT", *arg))
ops->ind[STOUC(*arg)] = 1;
else if (*arg == 'A') {
if (arg[1]) {
arrnam = arg+1;
} else if (!(arrnam = *++args)) {
zwarnnam(name, "missing parameter name",
NULL, 0);
return 1;
}
flags |= STF_ARRAY;
break;
} else if (*arg == 'H') {
if (arg[1]) {
hashnam = arg+1;
} else if (!(hashnam = *++args)) {
zwarnnam(name, "missing parameter name",
NULL, 0);
return 1;
}
flags |= STF_HASH;
break;
} else if (*arg == 'f') {
char *sfd;
ops->ind['f'] = 1;
if (arg[1]) {
sfd = arg+1;
} else if (!(sfd = *++args)) {
zwarnnam(name, "missing file descriptor", NULL, 0);
return 1;
}
fd = zstrtol(sfd, &sfd, 10);
if (*sfd) {
zwarnnam(name, "bad file descriptor", NULL, 0);
return 1;
}
break;
} else if (*arg == 'F') {
if (arg[1]) {
timefmt = arg+1;
} else if (!(timefmt = *++args)) {
zwarnnam(name, "missing time format", NULL, 0);
return 1;
}
/* force string format in order to use time format */
ops->ind['s'] = 1;
break;
} else {
zwarnnam(name, "bad option: -%c", NULL, *arg);
return 1;
}
}
}
}
if ((flags & STF_ARRAY) && (flags & STF_HASH)) {
/* We don't implement setting multiple variables at once */
zwarnnam(name, "both array and hash requested", NULL, 0);
return 1;
/* Alternate method would be to make -H blank arrnam etc etc *
* and so get 'silent loss' of earlier choice, which would *
* be similar to stat -A foo -A bar filename */
}
if (OPT_ISSET(ops,'l')) {
/* list types and return: can also list to array */
if (arrnam) {
arrptr = array = (char **)zalloc((ST_COUNT+1)*sizeof(char *));
array[ST_COUNT] = NULL;
}
for (aptr = statelts; *aptr; aptr++) {
if (arrnam) {
*arrptr++ = ztrdup(*aptr);
} else {
printf("%s", *aptr);
if (aptr[1])
putchar(' ');
}
}
if (arrnam) {
setaparam(arrnam, array);
if (errflag)
return 1;
} else
putchar('\n');
return 0;
}
if (!*args && !OPT_ISSET(ops,'f')) {
zwarnnam(name, "no files given", NULL, 0);
return 1;
} else if (*args && OPT_ISSET(ops,'f')) {
zwarnnam(name, "no files allowed with -f", NULL, 0);
return 1;
}
nargs = 0;
if (OPT_ISSET(ops,'f'))
nargs = 1;
else
for (aptr = args; *aptr; aptr++)
nargs++;
if (OPT_ISSET(ops,'g')) {
flags |= STF_GMT;
ops->ind['s'] = 1;
}
if (OPT_ISSET(ops,'s') || OPT_ISSET(ops,'r'))
flags |= STF_STRING;
if (OPT_ISSET(ops,'r') || !OPT_ISSET(ops,'s'))
flags |= STF_RAW;
if (OPT_ISSET(ops,'n'))
flags |= STF_FILE;
if (OPT_ISSET(ops,'o'))
flags |= STF_OCTAL;
if (OPT_ISSET(ops,'t'))
flags |= STF_NAME;
if (!(arrnam || hashnam)) {
if (nargs > 1)
flags |= STF_FILE;
if (!(flags & STF_PICK))
flags |= STF_NAME;
}
if (OPT_ISSET(ops,'N') || OPT_ISSET(ops,'f'))
flags &= ~STF_FILE;
if (OPT_ISSET(ops,'T') || OPT_ISSET(ops,'H'))
flags &= ~STF_NAME;
if (hashnam) {
if (nargs > 1) {
zwarnnam(name, "only one file allowed with -H", NULL, 0);
return 1;
}
arrsize = (flags & STF_PICK) ? 1 : ST_COUNT;
if (flags & STF_FILE)
arrsize++;
hashptr = hash = (char **)zshcalloc((arrsize+1)*2*sizeof(char *));
}
if (arrnam) {
arrsize = (flags & STF_PICK) ? 1 : ST_COUNT;
if (flags & STF_FILE)
arrsize++;
arrsize *= nargs;
arrptr = array = (char **)zshcalloc((arrsize+1)*sizeof(char *));
}
for (; OPT_ISSET(ops,'f') || *args; args++) {
char outbuf[PATH_MAX + 9]; /* "link " + link name + NULL */
int rval = OPT_ISSET(ops,'f') ? fstat(fd, &statbuf) :
OPT_ISSET(ops,'L') ? lstat(unmeta(*args), &statbuf) :
stat(unmeta(*args), &statbuf);
if (rval) {
if (OPT_ISSET(ops,'f'))
sprintf(outbuf, "%d", fd);
zwarnnam(name, "%s: %e", OPT_ISSET(ops,'f') ? outbuf : *args,
errno);
ret = 1;
if (OPT_ISSET(ops,'f') || arrnam)
break;
else
continue;
}
if (flags & STF_FILE) {
if (arrnam)
*arrptr++ = ztrdup(*args);
else if (hashnam) {
*hashptr++ = ztrdup(HNAMEKEY);
*hashptr++ = ztrdup(*args);
} else
printf("%s%s", *args, (flags & STF_PICK) ? " " : ":\n");
}
if (iwhich > -1) {
statprint(&statbuf, outbuf, *args, iwhich, flags);
if (arrnam)
*arrptr++ = metafy(outbuf, -1, META_DUP);
else if (hashnam) {
/* STF_NAME explicitly turned off for ops.ind['H'] above */
*hashptr++ = ztrdup(statelts[iwhich]);
*hashptr++ = metafy(outbuf, -1, META_DUP);
} else
printf("%s\n", outbuf);
} else {
int i;
for (i = 0; i < ST_COUNT; i++) {
statprint(&statbuf, outbuf, *args, i, flags);
if (arrnam)
*arrptr++= metafy(outbuf, -1, META_DUP);
else if (hashnam) {
/* STF_NAME explicitly turned off for ops.ind['H'] above */
*hashptr++ = ztrdup(statelts[i]);
*hashptr++ = metafy(outbuf, -1, META_DUP);
} else
printf("%s\n", outbuf);
}
}
if (OPT_ISSET(ops,'f'))
break;
if (!arrnam && !hashnam && args[1] && !(flags & STF_PICK))
putchar('\n');
}
if (arrnam) {
if (ret)
freearray(array);
else {
setaparam(arrnam, array);
if (errflag)
return 1;
}
}
if (hashnam) {
if (ret)
freearray(hash);
else {
sethparam(hashnam, hash);
if (errflag)
return 1;
}
}
return ret;
}
static struct builtin bintab[] = {
BUILTIN("stat", 0, bin_stat, 0, -1, 0, NULL, NULL),
};
/**/
int
setup_(UNUSED(Module m))
{
return 0;
}
/**/
int
boot_(Module m)
{
return !addbuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
}
/**/
int
cleanup_(Module m)
{
deletebuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
return 0;
}
/**/
int
finish_(UNUSED(Module m))
{
return 0;
}
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