* modified by Herbert Xu to be used as built-in in ash.
* modified by Erik Andersen <andersen@codepoet.org> to be used
* in busybox.
+ * modified by Bernhard Fischer to be useable (i.e. a bit less bloaty).
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*
* "This program is in the Public Domain."
*/
-#include "busybox.h"
-#include <unistd.h>
-#include <ctype.h>
-#include <errno.h>
-#include <string.h>
+#include "libbb.h"
#include <setjmp.h>
+/* This is a NOFORK applet. Be very careful! */
+
+/* test_main() is called from shells, and we need to be extra careful here.
+ * This is true regardless of PREFER_APPLETS and STANDALONE_SHELL
+ * state. */
+
+
/* test(1) accepts the following grammar:
oexpr ::= aexpr | aexpr "-o" oexpr ;
aexpr ::= nexpr | nexpr "-a" aexpr ;
RPAREN,
OPERAND
};
-
+#define is_int_op(a) (((unsigned char)((a) - INTEQ)) <= 5)
+#define is_str_op(a) (((unsigned char)((a) - STREZ)) <= 5)
+#define is_file_op(a) (((unsigned char)((a) - FILNT)) <= 2)
+#define is_file_access(a) (((unsigned char)((a) - FILRD)) <= 2)
+#define is_file_type(a) (((unsigned char)((a) - FILREG)) <= 5)
+#define is_file_bit(a) (((unsigned char)((a) - FILSUID)) <= 2)
enum token_types {
UNOP,
BINOP,
};
static const struct t_op {
- const char *op_text;
- short op_num, op_type;
+ char op_text[4];
+ unsigned char op_num, op_type;
} ops[] = {
- {
- "-r", FILRD, UNOP}, {
- "-w", FILWR, UNOP}, {
- "-x", FILEX, UNOP}, {
- "-e", FILEXIST, UNOP}, {
- "-f", FILREG, UNOP}, {
- "-d", FILDIR, UNOP}, {
- "-c", FILCDEV, UNOP}, {
- "-b", FILBDEV, UNOP}, {
- "-p", FILFIFO, UNOP}, {
- "-u", FILSUID, UNOP}, {
- "-g", FILSGID, UNOP}, {
- "-k", FILSTCK, UNOP}, {
- "-s", FILGZ, UNOP}, {
- "-t", FILTT, UNOP}, {
- "-z", STREZ, UNOP}, {
- "-n", STRNZ, UNOP}, {
- "-h", FILSYM, UNOP}, /* for backwards compat */
- {
- "-O", FILUID, UNOP}, {
- "-G", FILGID, UNOP}, {
- "-L", FILSYM, UNOP}, {
- "-S", FILSOCK, UNOP}, {
- "=", STREQ, BINOP}, {
- "==", STREQ, BINOP}, {
- "!=", STRNE, BINOP}, {
- "<", STRLT, BINOP}, {
- ">", STRGT, BINOP}, {
- "-eq", INTEQ, BINOP}, {
- "-ne", INTNE, BINOP}, {
- "-ge", INTGE, BINOP}, {
- "-gt", INTGT, BINOP}, {
- "-le", INTLE, BINOP}, {
- "-lt", INTLT, BINOP}, {
- "-nt", FILNT, BINOP}, {
- "-ot", FILOT, BINOP}, {
- "-ef", FILEQ, BINOP}, {
- "!", UNOT, BUNOP}, {
- "-a", BAND, BBINOP}, {
- "-o", BOR, BBINOP}, {
- "(", LPAREN, PAREN}, {
- ")", RPAREN, PAREN}, {
- 0, 0, 0}
+ { "-r", FILRD , UNOP },
+ { "-w", FILWR , UNOP },
+ { "-x", FILEX , UNOP },
+ { "-e", FILEXIST, UNOP },
+ { "-f", FILREG , UNOP },
+ { "-d", FILDIR , UNOP },
+ { "-c", FILCDEV , UNOP },
+ { "-b", FILBDEV , UNOP },
+ { "-p", FILFIFO , UNOP },
+ { "-u", FILSUID , UNOP },
+ { "-g", FILSGID , UNOP },
+ { "-k", FILSTCK , UNOP },
+ { "-s", FILGZ , UNOP },
+ { "-t", FILTT , UNOP },
+ { "-z", STREZ , UNOP },
+ { "-n", STRNZ , UNOP },
+ { "-h", FILSYM , UNOP }, /* for backwards compat */
+
+ { "-O" , FILUID , UNOP },
+ { "-G" , FILGID , UNOP },
+ { "-L" , FILSYM , UNOP },
+ { "-S" , FILSOCK, UNOP },
+ { "=" , STREQ , BINOP },
+ { "==" , STREQ , BINOP },
+ { "!=" , STRNE , BINOP },
+ { "<" , STRLT , BINOP },
+ { ">" , STRGT , BINOP },
+ { "-eq", INTEQ , BINOP },
+ { "-ne", INTNE , BINOP },
+ { "-ge", INTGE , BINOP },
+ { "-gt", INTGT , BINOP },
+ { "-le", INTLE , BINOP },
+ { "-lt", INTLT , BINOP },
+ { "-nt", FILNT , BINOP },
+ { "-ot", FILOT , BINOP },
+ { "-ef", FILEQ , BINOP },
+ { "!" , UNOT , BUNOP },
+ { "-a" , BAND , BBINOP },
+ { "-o" , BOR , BBINOP },
+ { "(" , LPAREN , PAREN },
+ { ")" , RPAREN , PAREN },
};
-#ifdef CONFIG_FEATURE_TEST_64
+
+#if ENABLE_FEATURE_TEST_64
typedef int64_t arith_t;
#else
typedef int arith_t;
#endif
-static char **t_wp;
-static struct t_op const *t_wp_op;
-static gid_t *group_array;
-static int ngroups;
-static enum token t_lex(char *s);
-static arith_t oexpr(enum token n);
-static arith_t aexpr(enum token n);
-static arith_t nexpr(enum token n);
-static int binop(void);
-static arith_t primary(enum token n);
-static int filstat(char *nm, enum token mode);
-static arith_t getn(const char *s);
-static int newerf(const char *f1, const char *f2);
-static int olderf(const char *f1, const char *f2);
-static int equalf(const char *f1, const char *f2);
-static int test_eaccess(char *path, int mode);
-static int is_a_group_member(gid_t gid);
-static void initialize_group_array(void);
-
-static jmp_buf leaving;
-
-int bb_test(int argc, char **argv)
-{
- int res;
+/* We try to minimize both static and stack usage. */
+struct statics {
+ char **t_wp;
+ const struct t_op *t_wp_op;
+ gid_t *group_array;
+ int ngroups;
+ jmp_buf leaving;
+};
- if (LONE_CHAR(argv[0], '[')) {
- --argc;
- if (NOT_LONE_CHAR(argv[argc], ']')) {
- bb_error_msg("missing ]");
- return 2;
- }
- argv[argc] = NULL;
- } else if (strcmp(argv[0], "[[") == 0) {
- --argc;
- if (strcmp(argv[argc], "]]")) {
- bb_error_msg("missing ]]");
- return 2;
- }
- argv[argc] = NULL;
- }
+/* Make it reside in writable memory, yet make compiler understand
+ * that it is not going to change. */
+static struct statics *const ptr_to_statics __attribute__ ((section (".data")));
- res = setjmp(leaving);
- if (res)
- return res;
+#define S (*ptr_to_statics)
+#define t_wp (S.t_wp )
+#define t_wp_op (S.t_wp_op )
+#define group_array (S.group_array )
+#define ngroups (S.ngroups )
+#define leaving (S.leaving )
- /* resetting ngroups is probably unnecessary. it will
- * force a new call to getgroups(), which prevents using
- * group data fetched during a previous call. but the
- * only way the group data could be stale is if there's
- * been an intervening call to setgroups(), and this
- * isn't likely in the case of a shell. paranoia
- * prevails...
- */
- ngroups = 0;
+#define INIT_S() do { \
+ (*(struct statics**)&ptr_to_statics) = xzalloc(sizeof(S)); \
+} while (0)
+#define DEINIT_S() do { \
+ free(ptr_to_statics); \
+} while (0)
- /* Implement special cases from POSIX.2, section 4.62.4 */
- switch (argc) {
- case 1:
- return 1;
- case 2:
- return *argv[1] == '\0';
- case 3:
- if (argv[1][0] == '!' && argv[1][1] == '\0') {
- return *argv[2] != '\0';
- }
- break;
- case 4:
- if (argv[1][0] != '!' || argv[1][1] != '\0') {
- if (t_lex(argv[2]), t_wp_op && t_wp_op->op_type == BINOP) {
- t_wp = &argv[1];
- return binop() == 0;
- }
- }
- break;
- case 5:
- if (argv[1][0] == '!' && argv[1][1] == '\0') {
- if (t_lex(argv[3]), t_wp_op && t_wp_op->op_type == BINOP) {
- t_wp = &argv[2];
- return binop() != 0;
- }
- }
- break;
- }
-
- t_wp = &argv[1];
- res = !oexpr(t_lex(*t_wp));
-
- if (*t_wp != NULL && *++t_wp != NULL) {
- bb_error_msg("%s: unknown operand", *t_wp);
- return 2;
- }
- return res;
-}
+static arith_t primary(enum token n);
+static void syntax(const char *op, const char *msg) ATTRIBUTE_NORETURN;
static void syntax(const char *op, const char *msg)
{
if (op && *op) {
bb_error_msg("%s: %s", op, msg);
} else {
- bb_error_msg("%s", msg);
+ bb_error_msg("%s: %s"+4, msg);
}
longjmp(leaving, 2);
}
-static arith_t oexpr(enum token n)
-{
- arith_t res;
-
- res = aexpr(n);
- if (t_lex(*++t_wp) == BOR) {
- return oexpr(t_lex(*++t_wp)) || res;
- }
- t_wp--;
- return res;
-}
-
-static arith_t aexpr(enum token n)
-{
- arith_t res;
-
- res = nexpr(n);
- if (t_lex(*++t_wp) == BAND)
- return aexpr(t_lex(*++t_wp)) && res;
- t_wp--;
- return res;
-}
-
-static arith_t nexpr(enum token n)
-{
- if (n == UNOT)
- return !nexpr(t_lex(*++t_wp));
- return primary(n);
-}
-
-static arith_t primary(enum token n)
-{
- arith_t res;
-
- if (n == EOI) {
- syntax(NULL, "argument expected");
- }
- if (n == LPAREN) {
- res = oexpr(t_lex(*++t_wp));
- if (t_lex(*++t_wp) != RPAREN)
- syntax(NULL, "closing paren expected");
- return res;
- }
- if (t_wp_op && t_wp_op->op_type == UNOP) {
- /* unary expression */
- if (*++t_wp == NULL)
- syntax(t_wp_op->op_text, "argument expected");
- switch (n) {
- case STREZ:
- return strlen(*t_wp) == 0;
- case STRNZ:
- return strlen(*t_wp) != 0;
- case FILTT:
- return isatty(getn(*t_wp));
- default:
- return filstat(*t_wp, n);
- }
- }
-
- if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
- return binop();
- }
-
- return strlen(*t_wp) > 0;
-}
-
-static int binop(void)
-{
- const char *opnd1, *opnd2;
- struct t_op const *op;
-
- opnd1 = *t_wp;
- (void) t_lex(*++t_wp);
- op = t_wp_op;
-
- if ((opnd2 = *++t_wp) == (char *) 0)
- syntax(op->op_text, "argument expected");
-
- switch (op->op_num) {
- case STREQ:
- return strcmp(opnd1, opnd2) == 0;
- case STRNE:
- return strcmp(opnd1, opnd2) != 0;
- case STRLT:
- return strcmp(opnd1, opnd2) < 0;
- case STRGT:
- return strcmp(opnd1, opnd2) > 0;
- case INTEQ:
- return getn(opnd1) == getn(opnd2);
- case INTNE:
- return getn(opnd1) != getn(opnd2);
- case INTGE:
- return getn(opnd1) >= getn(opnd2);
- case INTGT:
- return getn(opnd1) > getn(opnd2);
- case INTLE:
- return getn(opnd1) <= getn(opnd2);
- case INTLT:
- return getn(opnd1) < getn(opnd2);
- case FILNT:
- return newerf(opnd1, opnd2);
- case FILOT:
- return olderf(opnd1, opnd2);
- case FILEQ:
- return equalf(opnd1, opnd2);
- }
- /* NOTREACHED */
- return 1;
-}
-
-static int filstat(char *nm, enum token mode)
-{
- struct stat s;
- unsigned int i;
-
- if (mode == FILSYM) {
-#ifdef S_IFLNK
- if (lstat(nm, &s) == 0) {
- i = S_IFLNK;
- goto filetype;
- }
-#endif
- return 0;
- }
-
- if (stat(nm, &s) != 0)
- return 0;
-
- switch (mode) {
- case FILRD:
- return test_eaccess(nm, R_OK) == 0;
- case FILWR:
- return test_eaccess(nm, W_OK) == 0;
- case FILEX:
- return test_eaccess(nm, X_OK) == 0;
- case FILEXIST:
- return 1;
- case FILREG:
- i = S_IFREG;
- goto filetype;
- case FILDIR:
- i = S_IFDIR;
- goto filetype;
- case FILCDEV:
- i = S_IFCHR;
- goto filetype;
- case FILBDEV:
- i = S_IFBLK;
- goto filetype;
- case FILFIFO:
-#ifdef S_IFIFO
- i = S_IFIFO;
- goto filetype;
-#else
- return 0;
-#endif
- case FILSOCK:
-#ifdef S_IFSOCK
- i = S_IFSOCK;
- goto filetype;
-#else
- return 0;
-#endif
- case FILSUID:
- i = S_ISUID;
- goto filebit;
- case FILSGID:
- i = S_ISGID;
- goto filebit;
- case FILSTCK:
- i = S_ISVTX;
- goto filebit;
- case FILGZ:
- return s.st_size > 0L;
- case FILUID:
- return s.st_uid == geteuid();
- case FILGID:
- return s.st_gid == getegid();
- default:
- return 1;
- }
-
- filetype:
- return ((s.st_mode & S_IFMT) == i);
-
- filebit:
- return ((s.st_mode & i) != 0);
-}
-
-static enum token t_lex(char *s)
-{
- struct t_op const *op = ops;
-
- if (s == 0) {
- t_wp_op = (struct t_op *) 0;
- return EOI;
- }
- while (op->op_text) {
- if (strcmp(s, op->op_text) == 0) {
- t_wp_op = op;
- return op->op_num;
- }
- op++;
- }
- t_wp_op = (struct t_op *) 0;
- return OPERAND;
-}
-
/* atoi with error detection */
+//XXX: FIXME: duplicate of existing libbb function?
static arith_t getn(const char *s)
{
char *p;
-#ifdef CONFIG_FEATURE_TEST_64
+#if ENABLE_FEATURE_TEST_64
long long r;
#else
long r;
#endif
errno = 0;
-#ifdef CONFIG_FEATURE_TEST_64
+#if ENABLE_FEATURE_TEST_64
r = strtoll(s, &p, 10);
#else
r = strtol(s, &p, 10);
return r;
}
+/* UNUSED
static int newerf(const char *f1, const char *f2)
{
struct stat b1, b2;
stat(f2, &b2) == 0 &&
b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino);
}
+*/
+
+
+static enum token t_lex(char *s)
+{
+ const struct t_op *op;
+
+ t_wp_op = NULL;
+ if (s == NULL) {
+ return EOI;
+ }
+
+ op = ops;
+ do {
+ if (strcmp(s, op->op_text) == 0) {
+ t_wp_op = op;
+ return op->op_num;
+ }
+ op++;
+ } while (op < ops + ARRAY_SIZE(ops));
+
+ return OPERAND;
+}
+
+
+static int binop(void)
+{
+ const char *opnd1, *opnd2;
+ struct t_op const *op;
+ arith_t val1, val2;
+
+ opnd1 = *t_wp;
+ (void) t_lex(*++t_wp);
+ op = t_wp_op;
+
+ opnd2 = *++t_wp;
+ if (opnd2 == NULL)
+ syntax(op->op_text, "argument expected");
+
+ if (is_int_op(op->op_num)) {
+ val1 = getn(opnd1);
+ val2 = getn(opnd2);
+ if (op->op_num == INTEQ)
+ return val1 == val2;
+ if (op->op_num == INTNE)
+ return val1 != val2;
+ if (op->op_num == INTGE)
+ return val1 >= val2;
+ if (op->op_num == INTGT)
+ return val1 > val2;
+ if (op->op_num == INTLE)
+ return val1 <= val2;
+ if (op->op_num == INTLT)
+ return val1 < val2;
+ }
+ if (is_str_op(op->op_num)) {
+ val1 = strcmp(opnd1, opnd2);
+ if (op->op_num == STREQ)
+ return val1 == 0;
+ if (op->op_num == STRNE)
+ return val1 != 0;
+ if (op->op_num == STRLT)
+ return val1 < 0;
+ if (op->op_num == STRGT)
+ return val1 > 0;
+ }
+ /* We are sure that these three are by now the only binops we didn't check
+ * yet, so we do not check if the class is correct:
+ */
+/* if (is_file_op(op->op_num)) */
+ {
+ struct stat b1, b2;
+
+ if (stat(opnd1, &b1) || stat(opnd2, &b2))
+ return 0; /* false, since at least one stat failed */
+ if (op->op_num == FILNT)
+ return b1.st_mtime > b2.st_mtime;
+ if (op->op_num == FILOT)
+ return b1.st_mtime < b2.st_mtime;
+ if (op->op_num == FILEQ)
+ return b1.st_dev == b2.st_dev && b1.st_ino == b2.st_ino;
+ }
+ return 1; /* NOTREACHED */
+}
+
+
+static void initialize_group_array(void)
+{
+ ngroups = getgroups(0, NULL);
+ if (ngroups > 0) {
+ /* FIXME: ash tries so hard to not die on OOM,
+ * and we spoil it with just one xrealloc here */
+ /* We realloc, because test_main can be entered repeatedly by shell.
+ * Testcase (ash): 'while true; do test -x some_file; done'
+ * and watch top. (some_file must have owner != you) */
+ group_array = xrealloc(group_array, ngroups * sizeof(gid_t));
+ getgroups(ngroups, group_array);
+ }
+}
+
+
+/* Return non-zero if GID is one that we have in our groups list. */
+//XXX: FIXME: duplicate of existing libbb function?
+// see toplevel TODO file:
+// possible code duplication ingroup() and is_a_group_member()
+static int is_a_group_member(gid_t gid)
+{
+ int i;
+
+ /* Short-circuit if possible, maybe saving a call to getgroups(). */
+ if (gid == getgid() || gid == getegid())
+ return 1;
+
+ if (ngroups == 0)
+ initialize_group_array();
+
+ /* Search through the list looking for GID. */
+ for (i = 0; i < ngroups; i++)
+ if (gid == group_array[i])
+ return 1;
+
+ return 0;
+}
+
/* Do the same thing access(2) does, but use the effective uid and gid,
and don't make the mistake of telling root that any file is
return -1;
}
-static void initialize_group_array(void)
+
+static int filstat(char *nm, enum token mode)
{
- ngroups = getgroups(0, NULL);
- if (ngroups > 0) {
- group_array = xmalloc(ngroups * sizeof(gid_t));
- getgroups(ngroups, group_array);
+ struct stat s;
+ int i = i; /* gcc 3.x thinks it can be used uninitialized */
+
+ if (mode == FILSYM) {
+#ifdef S_IFLNK
+ if (lstat(nm, &s) == 0) {
+ i = S_IFLNK;
+ goto filetype;
+ }
+#endif
+ return 0;
+ }
+
+ if (stat(nm, &s) != 0)
+ return 0;
+ if (mode == FILEXIST)
+ return 1;
+ if (is_file_access(mode)) {
+ if (mode == FILRD)
+ i = R_OK;
+ if (mode == FILWR)
+ i = W_OK;
+ if (mode == FILEX)
+ i = X_OK;
+ return test_eaccess(nm, i) == 0;
+ }
+ if (is_file_type(mode)) {
+ if (mode == FILREG)
+ i = S_IFREG;
+ if (mode == FILDIR)
+ i = S_IFDIR;
+ if (mode == FILCDEV)
+ i = S_IFCHR;
+ if (mode == FILBDEV)
+ i = S_IFBLK;
+ if (mode == FILFIFO) {
+#ifdef S_IFIFO
+ i = S_IFIFO;
+#else
+ return 0;
+#endif
+ }
+ if (mode == FILSOCK) {
+#ifdef S_IFSOCK
+ i = S_IFSOCK;
+#else
+ return 0;
+#endif
+ }
+ filetype:
+ return ((s.st_mode & S_IFMT) == i);
+ }
+ if (is_file_bit(mode)) {
+ if (mode == FILSUID)
+ i = S_ISUID;
+ if (mode == FILSGID)
+ i = S_ISGID;
+ if (mode == FILSTCK)
+ i = S_ISVTX;
+ return ((s.st_mode & i) != 0);
}
+ if (mode == FILGZ)
+ return s.st_size > 0L;
+ if (mode == FILUID)
+ return s.st_uid == geteuid();
+ if (mode == FILGID)
+ return s.st_gid == getegid();
+ return 1; /* NOTREACHED */
}
-/* Return non-zero if GID is one that we have in our groups list. */
-static int is_a_group_member(gid_t gid)
+
+static arith_t nexpr(enum token n)
{
- int i;
+ if (n == UNOT)
+ return !nexpr(t_lex(*++t_wp));
+ return primary(n);
+}
- /* Short-circuit if possible, maybe saving a call to getgroups(). */
- if (gid == getgid() || gid == getegid())
- return 1;
- if (ngroups == 0)
- initialize_group_array();
+static arith_t aexpr(enum token n)
+{
+ arith_t res;
- /* Search through the list looking for GID. */
- for (i = 0; i < ngroups; i++)
- if (gid == group_array[i])
- return 1;
+ res = nexpr(n);
+ if (t_lex(*++t_wp) == BAND)
+ return aexpr(t_lex(*++t_wp)) && res;
+ t_wp--;
+ return res;
+}
- return 0;
+
+static arith_t oexpr(enum token n)
+{
+ arith_t res;
+
+ res = aexpr(n);
+ if (t_lex(*++t_wp) == BOR) {
+ return oexpr(t_lex(*++t_wp)) || res;
+ }
+ t_wp--;
+ return res;
}
-/* applet entry point */
-int test_main(int argc, char **argv);
-int test_main(int argc, char **argv)
+static arith_t primary(enum token n)
{
- return bb_test(argc, argv);
+ arith_t res;
+
+ if (n == EOI) {
+ syntax(NULL, "argument expected");
+ }
+ if (n == LPAREN) {
+ res = oexpr(t_lex(*++t_wp));
+ if (t_lex(*++t_wp) != RPAREN)
+ syntax(NULL, "closing paren expected");
+ return res;
+ }
+ if (t_wp_op && t_wp_op->op_type == UNOP) {
+ /* unary expression */
+ if (*++t_wp == NULL)
+ syntax(t_wp_op->op_text, "argument expected");
+ if (n == STREZ)
+ return t_wp[0][0] == '\0';
+ if (n == STRNZ)
+ return t_wp[0][0] != '\0';
+ if (n == FILTT)
+ return isatty(getn(*t_wp));
+ return filstat(*t_wp, n);
+ }
+
+ t_lex(t_wp[1]);
+ if (t_wp_op && t_wp_op->op_type == BINOP) {
+ return binop();
+ }
+
+ return t_wp[0][0] != '\0';
}
+
+int test_main(int argc, char **argv)
+{
+ int res;
+ const char *arg0;
+ bool _off;
+
+ arg0 = bb_basename(argv[0]);
+ if (arg0[0] == '[') {
+ --argc;
+ if (!arg0[1]) { /* "[" ? */
+ if (NOT_LONE_CHAR(argv[argc], ']')) {
+ bb_error_msg("missing ]");
+ return 2;
+ }
+ } else { /* assuming "[[" */
+ if (strcmp(argv[argc], "]]") != 0) {
+ bb_error_msg("missing ]]");
+ return 2;
+ }
+ }
+ argv[argc] = NULL;
+ }
+
+ /* We must do DEINIT_S() prior to returning */
+ INIT_S();
+
+ res = setjmp(leaving);
+ if (res) {
+ goto ret;
+ }
+
+ /* resetting ngroups is probably unnecessary. it will
+ * force a new call to getgroups(), which prevents using
+ * group data fetched during a previous call. but the
+ * only way the group data could be stale is if there's
+ * been an intervening call to setgroups(), and this
+ * isn't likely in the case of a shell. paranoia
+ * prevails...
+ */
+ ngroups = 0;
+
+ /* Implement special cases from POSIX.2, section 4.62.4 */
+ if (argc == 1) {
+ res = 1;
+ goto ret;
+ }
+ if (argc == 2) {
+ res = (*argv[1] == '\0');
+ goto ret;
+ }
+
+ /* remember if we saw argc==4 which wants *no* '!' test */
+ _off = argc - 4;
+ if (_off ? (LONE_CHAR(argv[1], '!'))
+ : (argv[1][0] != '!' || argv[1][1] != '\0')
+ ) {
+ if (argc == 3) {
+ res = (*argv[2] != '\0');
+ goto ret;
+ }
+
+ t_lex(argv[2 + _off]);
+ if (t_wp_op && t_wp_op->op_type == BINOP) {
+ t_wp = &argv[1 + _off];
+ res = (binop() == _off);
+ goto ret;
+ }
+ }
+ t_wp = &argv[1];
+ res = !oexpr(t_lex(*t_wp));
+
+ if (*t_wp != NULL && *++t_wp != NULL) {
+ bb_error_msg("%s: unknown operand", *t_wp);
+ res = 2;
+ }
+ ret:
+ DEINIT_S();
+ return res;
+}
projects / oweals / busybox.git / blobdiff