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rh.c
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/*
* rh.c
*
* Written by: Ken Stauffer
* Rick Ohnemus (rick@sterling.com)
*
* Global Functions: main, func_name, activate, deactivate
*
* Static Functions: printhelp, max_descriptors, fmt_req_stat,
* prog_req_stat, execute, exam1, exam2,
* exam3, exam4, get_rhpath, get_func,
* push_instr, write_tree, write_functions
*/
#include "rh.h"
#include "rhcmds.h"
#include "rhdata.h"
#include "rhgram.h"
#include "alloc.h"
#include "errmsg.h"
#include <fcntl.h>
#include <pwd.h>
#if defined(DEBUG)
# include <assert.h>
# include "dump.h"
#endif
#define VERSION "Version 3.0r"
extern void ftrw(char *file,
void (*fn)(),
int depth,
int dashr,
int samefsPC);
extern char * graphic(const char *name);
extern void printentry(int verbose,
int str_owner,
int full_date,
struct stat *buf,
const char *name);
extern void printformat(struct stat *buf,
const char *name,
int depth);
extern int rh_parse();
extern void rhfinish(void);
extern void rhinit(void);
static int * active_funcs = (int *) NULL;
static int num_active_funcs = 0;
#if defined(DEBUG)
extern int gd_debug;
extern int rh_debug;
extern int yy_flex_debug;
int Trace = 0;
#endif
#if defined(S_IFLNK)
#if defined(DEBUG)
#define SWITCHES "0CDFLTUVWXYZbcde:f:hilp:qrstvwx:"
#else
#define SWITCHES "0CDFLVbcde:f:hilp:qrstvwx:"
#endif
static char *usage =
"Usage: %s [-0CDFLVbcdhilqrsvw] [-f filename] [-e expression]\n"
"\t\t[-p format] [-x command] [directory/file ...]\n";
#else
#if defined(DEBUG)
#define SWITCHES "0CTUVWXYZbcde:f:hilp:qrstvwx:"
#else
#define SWITCHES "0CVbcde:f:hilp:qrstvwx:"
#endif
static char *usage =
"Usage: %s [-0CVbcdhilqrsvw] [-f filename] [-e expression]\n"
"\t\t[-p format] [-x command] [directory/file ...]\n";
#endif
/*
* printhelp:
* Print out the help screen. The string 's' is argv[0].
* Called when the -h option is used.
*/
static void printhelp(const char *s)
{
int i;
const symbol * p;
(void) fprintf(stderr, usage, s);
(void) fprintf(stderr, "\n%s\n", VERSION);
(void) fprintf(stderr, "\noptions:\n"
#if defined(DEBUG)
"\t-T\ttrace\n"
"\t-U\tdump entire compiled program\n"
"\t-W\tdump executable compiled program\n"
"\t-X\tgetdate debug\n"
"\t-Y\trhgram debug\n"
"\t-Z\trhlex debug\n"
#endif
#if defined(S_IFLNK)
"\t-D\tfollow symbolic links that point to directories\n"
"\t-F\tfollow symbolic links that point to non-directories\n"
"\t-L\tfollow all symbolic links\n"
#endif
"\t-C\tdo not cross file systems\n"
"\t-V\twrite version number to stderr and exit\n"
"\t-b\tprint leading \"./\" if no directory\n"
"\t-c\tdo not read RHRC file\n"
"\t-d\tleading '?' or '*' matches leading '.' in file name\n"
"\t-e\tget expression from the command line\n"
"\t-f\tget expression from file\n"
"\t-i\tignore case during file name matching\n"
"\t-h\tshow this message and exit\n"
"\t-l\tlong filename output\n"
"\t-p format\tprint file information using 'format'\n"
"\t-q\tdisplay non-graphic characters in filenames as ?\n"
"\t-r\tdo not go down the directory tree (non-recursive)\n"
"\t-s\tprint users/groups as strings instead of numbers\n"
"\t-t\tprint full date/time instead of ls(1) type date/time\n"
"\t-v\tverbose output\n"
"\t-w\tdisplay warning messages\n"
"\t-x command\texecute 'command' for matching files\n"
"\t-0\tseparate filenames by null char, not newline\n"
"\nvalid symbols:\n"
);
for (i = 1, p = Symbol_table; p != (symbol *) NULL; p = p->next, i++) {
(void) fprintf(stderr, "%12s%s", p->name,
(((i - 1) % 5) == 4
|| p->next == (symbol *) NULL) ? "\n" : " ");
}
(void) fprintf(stderr, "\nC operators:\n"
"\t! ~ - * / %% + < <= > >= == != & ^ | << >> && || ?:\n"
"\nspecial operators:\n"
"\t$username , @groupname , \"*.c\" , [date/time spec]\n\n"
);
exit(1);
}
#if defined(RLIMIT_NOFILE)
/*
* max_descriptors:
* Returns the maximum number of file descriptors.
*/
static int max_descriptors(void)
{
struct rlimit newrlp;
struct rlimit rlp;
if (getrlimit(RLIMIT_NOFILE, &rlp) == 0) {
if (rlp.rlim_cur < NOFILE) {
newrlp.rlim_max = newrlp.rlim_cur = NOFILE;
if (setrlimit(RLIMIT_NOFILE, &newrlp) == 0)
return NOFILE;
}
return rlp.rlim_cur;
}
else {
return NOFILE;
}
}
#endif
/*
* func_name:
* If a PC corresponds to a compiled function then
* return the function's name. Otherwise, return
* NULL.
*/
const char *func_name(int pc)
{
const symbol * s;
for (s = Symbol_table; s != (symbol *) NULL; s = s->next) {
if (s->type == FUNCTION && s->value == pc) {
return s->name;
}
}
return (char *) NULL;
}
/*
* activate:
* If a function is active then return 0 (FALSE). If the function
* is not active then save the pc and return 1 (TRUE).
*/
int activate(int pc)
{
int i;
for (i = 0; i < num_active_funcs; i++) {
if (pc == active_funcs[i]) {
return 0;
}
}
active_funcs =
REALLOCATE(active_funcs, (num_active_funcs + 1) * sizeof(int));
active_funcs[num_active_funcs++] = pc;
return 1;
}
/*
* deactivate:
* Remove a function's pc from the active list.
*/
void deactivate(int pc)
{
const char * fn;
int i;
for (i = 0; i < num_active_funcs; i++) {
if (pc == active_funcs[i]) {
if (num_active_funcs == 1) {
num_active_funcs = 0;
free((char *) active_funcs);
active_funcs = (int *) NULL;
}
else {
for (--num_active_funcs; i < num_active_funcs; i++) {
active_funcs[i] = active_funcs[i + 1];
}
}
return;
}
}
fn = func_name(pc);
error("deactivate: function '%s' not active\n", (fn == NULL) ? "" : fn);
}
/*
* fmt_req_stat:
* Scan '-p' switch format string for anything that
* requires a stat() call to be made.
* Return TRUE if stat() is needed or FALSE if it isn't.
*/
static int fmt_req_stat(void)
{
const char * fp;
int stat_all = FALSE;
for (fp = attr.format; *fp != '\0' && !stat_all; fp++) {
if (*fp != '%') {
continue;
}
++fp;
switch (*fp) {
case '\0':
error("format character missing after '%%'");
/*NOTREACHED*/
case 'a':
#if BSD
case 'b':
case 'B':
#endif
case 'c':
case 'g':
case 'G':
case 'i':
case 'l':
case 'm':
case 'p':
case 'P':
case 'r':
case 'R':
case 'u':
case 'U':
case 'w':
case 'W':
case 'y':
case 'z':
stat_all = TRUE;
break;
}
}
return stat_all;
}
/*
* prog_req_stat:
* Scan the compiled program for any builtin functions
* that require a stat() call to be made.
* Return TRUE if stat() is needed or FALSE if it isn't.
*/
static int prog_req_stat(int pc)
{
const instruction * ip;
const symbol * sym;
if (StackProgram[pc].func == END_OF_PROG) {
return -1;
}
for (ip = &StackProgram[pc]; ip->func != NULL_INSTR; ip++, pc++) {
for (sym = Symbol_table; sym != (symbol *) NULL; sym = sym->next) {
if (ip->func == sym->func) {
if (sym->req_stat) {
return 1;
}
break;
}
}
if (ip->func == c_func) {
if (activate(ip->value.pc)) {
if (prog_req_stat((int) ip->value.pc)) {
deactivate(ip->value.pc);
return 1;
}
deactivate(ip->value.pc);
}
}
}
return 0;
}
/*
* execute:
* Execute the program contained in the StackProgram[] array.
* Each element of the StackProgram[] array contains a pointer
* to a C function.
* Programs are NULL_INSTR terminated. (NULL_INSTR is a NULL
* function pointer.)
* Returns the result of the expression.
*/
static long execute(void)
{
SP = 0;
if (startPC == -1) {
return 1;
}
for (PC = startPC; StackProgram[PC].func != NULL_INSTR; PC++) {
#if defined(DEBUG)
if (Trace) {
dump_instr(PC, &StackProgram[PC]);
}
#endif
(*StackProgram[PC].func)(&StackProgram[PC].value);
if (SP < 0) {
error("data stack underflow");
}
else if (SP >= MAX_STACK_LEN) {
error("data stack overflow");
}
}
#if defined(DEBUG)
assert(SP == 1);
if (Trace) {
(void) fprintf(stderr, "execute() returning %ld\n", Stack[0]);
}
#endif
return Stack[0];
}
/*
* exam1:
* exam2:
* exam3:
* exam4:
* One of these functions is called for every file that 'rh'
* examines. Each function first calls execute() to see if the
* expression is TRUE. If the expression is TRUE (non-zero)
* then the action specified by the command line options is
* executed.
*/
/* print file out by itself */
static void exam1(void)
{
if (execute()) {
(void) printf("%s%c",
attr.graphic ? graphic(attr.fname) : attr.fname,
attr.zero_term ? '\0' : '\n');
if (attr.zero_term) {
(void)fflush(stdout);
}
}
}
/* long output of file */
static void exam2(void)
{
if (execute()) {
printentry(attr.verbose, attr.str_owner, attr.full_date,
attr.buf, attr.fname);
}
return;
}
/* formatted output of file information */
static void exam3(void)
{
if (execute()) {
printformat(attr.buf, attr.fname, attr.depth);
}
return;
}
/* do a system(3) call of desired command */
static void exam4(void)
{
char command[NCARGS];
char * end;
int f_l;
char * n;
int n_l;
char * p;
char * q;
char * r;
int rv;
if (execute()) {
p = command;
end = command + sizeof(command);
n = (char *) NULL;
q = attr.command;
f_l = strlen(attr.fname);
while (*q != '\0') {
if (*q != '%') {
*p++ = *q++;
}
else {
++q;
if (*q == 's') {
if ((p + f_l) >= end) {
warning("%s: maximum command line length exceeded",
attr.fname);
return;
}
r = attr.fname;
while ((*p++ = *r++) != '\0')
/* void */ ;
p--;
}
else if (*q == 'S') {
if (n == (char *) NULL) {
if ((n = strrchr(attr.fname, '/')) == (char *) NULL) {
n = attr.fname;
}
else {
++n;
}
n_l = strlen(n);
}
if ((p + n_l) >= end) {
warning("%s: maximum command line length exceeded",
attr.fname);
return;
}
r = n;
while ((*p++ = *r++) != '\0')
/* void */ ;
p--;
}
else {
if ((p + 2) >= end) {
warning("%s: maximum command line length exceeded",
attr.fname);
return;
}
*p++ = '%';
*p++ = *q;
}
++q;
}
if (p == end) {
warning("%s: maximum command line length exceeded",
attr.fname);
return;
}
}
*p = '\0';
rv = system(command);
if (rv != 0) {
++attr.num_errors;
}
if (attr.verbose) {
(void) printf("%s exit(%d)\n", command, rv);
}
}
return;
}
/*
* get_rhpath:
* Return value of RHPATH environment variable.
* If RHPATH is not set then attempt to return
* the user's home directory.
*
* The value is returned in allocated memory.
*/
static char *get_rhpath(void)
{
const char * home;
char * rhpath;
rhpath = getenv(RHPATH_ENV);
if (rhpath == (char *) NULL) {
home = getenv(HOME_ENV);
if (home == (char *) NULL) {
struct passwd * info;
info = getpwuid(getuid());
if (info == (struct passwd *) NULL) {
rhpath = SAVESTR(".");
}
else {
rhpath = ALLOCATE(strlen(info->pw_dir) + 3);
(void) sprintf(rhpath, ".:%s", info->pw_dir);
}
}
else {
rhpath = ALLOCATE(strlen(home) + 3);
(void) sprintf(rhpath, ".:%s", home);
}
}
else {
rhpath = SAVESTR(rhpath);
}
return rhpath;
}
/*
* get_func:
* Returns the symbol table entry for an rh
* language function given the name of the function.
*/
symbol *get_func(char *func_name)
{
symbol * sym;
for (sym = Symbol_table; sym != (symbol *) NULL; sym = sym->next) {
if (sym->type == FUNCTION && strcmp(sym->name, func_name) == 0) {
return sym;
}
}
error("function '%s' lookup failure", func_name);
/*NOTREACHED*/
}
/*
* push_instr:
* Pushes an instruction on to the program stack.
*/
static void push_instr(void (*func)(instr_value *),
instr_value * value)
{
if (PC >= MAX_PROG_LEN) {
error("program is too big");
}
StackProgram[PC].func = func;
StackProgram[PC++].value = *value;
return;
}
/*
* write_tree:
* Compiles an expression tree on the program stack.
*/
static void write_tree(tree)
node * tree;
{
instr_value value;
if (tree == (node *) NULL) {
return;
}
if (tree->code.func == UNRES_FUNC) {
symbol *sym = get_func(tree->code.value.func_name);
if (tree->count > 0) {
int i;
for (i = 0; i < tree->count; i++) {
write_tree(tree->trees[i]);
}
free((char *) tree->trees);
}
tree->count = 0;
if (sym->value == -1) {
push_instr(UNRES_FUNC, &tree->code.value);
}
else {
value.pc = sym->value;
push_instr(c_func, &value);
}
}
else if (tree->code.func == TERTIARY) {
int colon_pc;
int qm_pc;
write_tree(tree->left);
qm_pc = PC;
value.pc = 0;
push_instr(c_qm, &value);
write_tree(tree->middle);
colon_pc = PC;
push_instr(c_colon, &value);
write_tree(tree->right);
StackProgram[qm_pc].value.pc = colon_pc;
StackProgram[colon_pc].value.pc = PC - 1;
}
else if (tree->code.func == c_syscall) {
if (tree->count > 0) {
int i;
for (i = 0; i < tree->count; i++) {
write_tree(tree->trees[i]);
}
free((char *) tree->trees);
}
tree->count = 0;
push_instr(c_syscall, &tree->code.value);
}
else {
write_tree(tree->left);
write_tree(tree->right);
push_instr(tree->code.func, &tree->code.value);
}
free((char *) tree);
return;
}
/*
* write_functions:
* Compiles all rh language functions on to the program stack.
*/
static void write_functions(void)
{
instruction * ip;
symbol * sym;
instr_value value;
for (sym = Symbol_table; sym != (symbol *) NULL; sym = sym->next) {
if (sym->type == FUNCTION) {
sym->value = PC;
value.num_params = sym->num_params;
push_instr(NUM_PARAMS, &value);
write_tree(sym->tree);
value.num_params = sym->num_params;
push_instr(c_return, &value);
value.l = 0L;
push_instr(NULL_INSTR, &value);
sym->tree = (node *) NULL;
}
}
value.l = 0L;
push_instr(NULL_INSTR, &value);
push_instr(END_OF_PROG, &value);
PC--;
for (ip = StackProgram; ip->func != END_OF_PROG; ip++) {
if (ip->func == UNRES_FUNC) {
ip->func = c_func;
sym = get_func(ip->value.func_name);
ip->value.pc = sym->value;
}
}
return;
}
/*
* main:
* Parse arguments.
* -b, -c, -D, -d, -F, -i, -L, -l, -q, -r, -s, -t, and -w switches
* can occur as often as desired even though only one occurence
* is necessaty.
*
* -e and -f can occur one or more times and each occurence must
* have an associated argument.
*
* First occurence of -h or -V causes a message to be output then
* rh exits.
*
* -p and -x can occur only once and must have an associated argument.
*
* -T, -W, -X, -Y, and -Z are only available if rh is compiled with
* debug turned on.
*
* Parse any RHRC file.
* Parse any -f filenames.
* Parse any -e expressions.
* If there is a start expression then compile it and all rh language
* functions.
* Perform the recursive hunt on remaining arguments.
*/
int
main(int argc, char *argv[])
{
extern int getopt();
extern char * optarg;
extern int opterr;
extern int optind;
extern char * resolve_name(const char *paths, const char *name);
extern void yyrestart();
char ** cl_exprs = (char **) NULL;
char ** cl_fnames = (char **) NULL;
int colon_pc;
int dashb = FALSE;
int dashl = FALSE;
int dashr = TRUE;
int depth;
int dont_cross_filesystems = FALSE;
void (*examptr)(void) = exam1; /* default output function */
int first_parse = TRUE;
int i;
int num_cl_exprs = 0;
int num_cl_fnames = 0;
int qm_pc;
int read_rhrc = TRUE;
char * rhpath = (char *) NULL; /* RHPATH env. variable */
int samefsPC = -1;
instr_value value;
#if defined(DEBUG)
int dump_all;
int dump_exec;
#endif
Program_name = strrchr(argv[0], '/');
Program_name = (Program_name == NULL) ? argv[0] : (Program_name + 1);
#if defined(DEBUG)
dump_all = dump_exec = gd_debug = rh_debug = yy_flex_debug = 0;
#endif
attr.command = (char *) NULL; /* -x option */
attr.format = (char *) NULL; /* -p option */
attr.dot_special = TRUE; /* -d option */
#if defined(S_IFLNK)
attr.follow_dir = FALSE; /* -D & -L options */
attr.follow_file = FALSE; /* -F & -L options */
#endif
attr.graphic = FALSE; /* -q option */
attr.ignore_case = FALSE; /* -i option */
attr.prune = FALSE; /* prune (obviously :-) */
attr.stat_all = FALSE; /* don't need to stat everything */
attr.str_owner = FALSE; /* -u option */
attr.verbose = FALSE; /* -v option */
attr.full_date = FALSE; /* -t option */
attr.num_errors = 0; /* no errors yet */
rhinit();
opterr = 1;
while ((i = getopt(argc, argv, SWITCHES)) != EOF) {
switch (i) {
case 'b':
dashb = TRUE;
break;
case 'C':
dont_cross_filesystems = TRUE;
attr.stat_all = TRUE; /* <<< is this necessary? */
break;
case 'c':
read_rhrc = FALSE;
break;
#if defined(S_IFLNK)
case 'D':
attr.follow_dir = TRUE;
attr.stat_all = TRUE;
break;
#endif
case 'd':
attr.dot_special = FALSE;
break;
case 'e':
cl_exprs =
REALLOCATE(cl_exprs, sizeof(char *) * (num_cl_exprs + 1));
cl_exprs[num_cl_exprs++] = optarg;
break;
#if defined(S_IFLNK)
case 'F':
attr.follow_file = TRUE;
attr.stat_all = TRUE;
break;
#endif
case 'f':
cl_fnames =
REALLOCATE(cl_fnames, sizeof(char *) * (num_cl_fnames + 1));
cl_fnames[num_cl_fnames++] = optarg;
break;
case 'h':
printhelp(argv[0]);
/*NOTREACHED*/
case 'i':
attr.ignore_case = TRUE;
break;
#if defined(S_IFLNK)
case 'L':
attr.follow_dir = TRUE;
attr.follow_file = TRUE;
attr.stat_all = TRUE;
break;
#endif
case 'l':
examptr = exam2;
dashl = TRUE;
attr.stat_all = TRUE;
break;
case 'p':
if (attr.format != (char *) NULL) {
error("only one -p option is allowed");
}
attr.format = optarg;
examptr = exam3;
break;
case 'q':
attr.graphic = TRUE;
break;
case 'r':
dashr = FALSE;
break;
case 's':
attr.str_owner = TRUE;
break;
case 't':
attr.full_date = TRUE;
break;
case 'V':
error(VERSION);
/*NOTREACHED*/
case 'v':
attr.verbose = TRUE;
break;
case 'w':
Issue_warnings = TRUE;
break;
case 'x':
if (attr.command != (char *) NULL) {
error("only one -x option is allowed");
}
examptr = exam4;
attr.command = optarg;
break;
case '0':
attr.zero_term = TRUE;
break;
#if defined(DEBUG)
case 'T':
++Trace;
break;
case 'U':
++dump_all;
break;
case 'W':
++dump_exec;
break;
case 'X':
++gd_debug;
break;
case 'Y':
++rh_debug;
break;
case 'Z':
++yy_flex_debug;
break;
#endif
default:
warning("use -h for help");
exit(1);
}
}
/* perform a little bit of sanity checking on switch combinations */
if (attr.command != (char *) NULL) {
if (dashl) {
error("cannot have both -x and -l options");
}
else if (attr.format != (char *) NULL) {
warning("-x overrides -p, -p ignored");
attr.format = (char *) NULL;
}
}
else if (attr.format != (char *) NULL) {
if (dashl) {
warning("-p overrides -l, -l ignored");
dashl = FALSE;
}
if (attr.verbose) {
warning("-p overrides -v, -v ignored");
attr.verbose = FALSE;
}
}
/*
* Always display control characters in file names as a '?'
* if the output is a terminal.
*/
if (isatty(fileno(stdout))) {
attr.graphic = TRUE;
}
/*
* Read and parse functions/expression in files.
*/
startPC = -1;
if (read_rhrc || num_cl_fnames) {
rhpath = get_rhpath();
if (read_rhrc) {
char *rhrc = getenv(RHRC_ENV);
if (rhrc == (char *) NULL) {
rhrc = RHRC;
}
Input_name = resolve_name(rhpath, rhrc);
Input_file = open(Input_name, O_RDONLY, 0);
if (Input_file != -1) {
if (rh_parse()) {