forked from luke-jr/gammamoo
/
extension-fileio.c
1773 lines (1488 loc) · 40.6 KB
/
extension-fileio.c
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/*
* File I/O extension
*/
#include "options.h"
#if defined(FILE_IO) || defined(FILE_IO_LOGGER)
static const char logger_pfx[] = "/LOG/";
#define LOGGER_PFX_LEN (sizeof(logger_pfx) - 1)
#include <stdio.h>
#include "my-stat.h"
#include <dirent.h>
/* some things are not defined in stdio on all systems -- AAB 06/03/97 */
#include <sys/types.h>
#include <errno.h>
#include "my-unistd.h"
#include "my-ctype.h"
#include "my-string.h"
#ifdef FILE_IO_LOGGER
#include "my-time.h"
#endif
#include "structures.h"
#include "exceptions.h"
#include "bf_register.h"
#include "functions.h"
#include "list.h"
#include "storage.h"
#include "utils.h"
#include "streams.h"
#include "server.h"
#include "network.h"
#include "tasks.h"
#include "log.h"
/* apparently, not defined on some SysVish systems -- AAB 06/03/97 */
typedef unsigned short umode_t;
/* your system may define o_mode_t instead -- AAB 06/03/97 */
/* typedef o_mode_t umode_t; */
/*****************************************************
* Utility functions
*****************************************************/
void
stream_add_raw_bytes_to_clean(Stream *s, const char *buffer, int buflen)
{
int i;
for (i = 0; i < buflen; i++) {
unsigned char c = buffer[i];
if (isgraph(c) || c == ' ')
stream_add_char(s, c);
/* else drop it on the floor */
}
}
const char *
clean_to_raw_bytes(const char *buffer, int *buflen)
{
*buflen = strlen(buffer);
return buffer;
}
/******************************************************
* Module-internal data structures
*****************************************************/
/*
* File types are either TEXT or BINARY
*/
typedef struct file_type *file_type;
struct file_type {
void (*in_filter_s)(Stream *s, const char *data, int buflen);
const char* (*out_filter)(const char *data, int *buflen);
};
file_type file_type_binary = NULL;
file_type file_type_text = NULL;
#define FILE_O_READ 1
#define FILE_O_WRITE 2
#define FILE_O_FLUSH 4
#define FILE_O_APPEND 32
#ifdef FILE_IO_LOGGER
#define FILE_O_LOG 64
#endif
typedef unsigned char file_mode;
typedef struct file_handle file_handle;
struct file_handle {
char valid; /* Is this a valid entry? */
char *name; /* pathname of the file */
file_type type; /* text or binary, sir? */
file_mode mode; /* readin', writin' or both */
FILE *file; /* the actual file handle */
};
typedef struct line_buffer line_buffer;
struct line_buffer {
char *line;
struct line_buffer *next;
};
/***************************************************************
* Version and package informaion
***************************************************************/
char file_package_name[] = "FIO";
char file_package_version[] = "1.5p3";
const char *file_logger_name = "FIO Logger";
const char *file_logger_version = "0.2";
/***************************************************************
* File <-> FHANDLE descriptor table interface
***************************************************************/
file_handle file_table[FILE_IO_MAX_FILES];
char
file_handle_valid(Var fhandle)
{
int32 i = fhandle.v.num;
if (fhandle.type != TYPE_INT)
return 0;
if ((i < 0) || (i >= FILE_IO_MAX_FILES))
return 0;
return file_table[i].valid;
}
FILE *
file_handle_file(Var fhandle)
{
int32 i = fhandle.v.num;
return file_table[i].file;
}
const char *
file_handle_name(Var fhandle)
{
int32 i = fhandle.v.num;
return file_table[i].name;
}
file_type
file_handle_type(Var fhandle)
{
int32 i = fhandle.v.num;
return file_table[i].type;
}
file_mode
file_handle_mode(Var fhandle)
{
int32 i = fhandle.v.num;
return file_table[i].mode;
}
void
file_handle_destroy(Var fhandle)
{
int32 i = fhandle.v.num;
file_table[i].file = NULL;
file_table[i].valid = 0;
free_str(file_table[i].name);
}
int32
file_allocate_next_handle(void)
{
static int32 current_handle = 0;
int32 wrapped = current_handle;
if (current_handle > FILE_IO_MAX_FILES)
wrapped = current_handle = 0;
while(current_handle < FILE_IO_MAX_FILES) {
if (!file_table[current_handle].valid)
break;
current_handle++;
if (current_handle > FILE_IO_MAX_FILES)
current_handle = 0;
if (current_handle == wrapped)
current_handle = FILE_IO_MAX_FILES;
}
if (current_handle == FILE_IO_MAX_FILES) {
current_handle = 0;
return -1;
}
return current_handle;
}
Var
file_handle_new(const char *name, file_type type, file_mode mode)
{
Var r;
int32 handle = file_allocate_next_handle();
r.type = TYPE_INT;
r.v.num = handle;
if (handle >= 0) {
file_table[handle].valid = 1;
file_table[handle].name = str_dup(name);
file_table[handle].type = type;
file_table[handle].mode = mode;
}
return r;
}
void
file_handle_set_file(Var fhandle, FILE *f)
{
int32 i = fhandle.v.num;
file_table[i].file = f;
}
/***************************************************************
* Interface for modestrings
***************************************************************/
/*
* Convert modestring to settings for type and mode.
* Returns pointer to stdio modestring if successfull and
* NULL if not.
*/
const char *
file_modestr_to_mode(const char *s, file_type *type, file_mode *mode)
{
static char buffer[4] = {0, 0, 0, 0};
int p = 0;
file_type t;
file_mode m = 0;
if (!file_type_binary) {
file_type_binary = mymalloc(sizeof(struct file_type), M_STRING);
file_type_text = mymalloc(sizeof(struct file_type), M_STRING);
file_type_binary->in_filter_s = stream_add_raw_bytes_to_binary;
file_type_binary->out_filter = binary_to_raw_bytes;
file_type_text->in_filter_s = stream_add_raw_bytes_to_clean;
file_type_text->out_filter = clean_to_raw_bytes;
}
if (strlen(s) != 4)
return 0;
buffer[p++] = s[0];
if (s[0] == 'r')
m |= FILE_O_READ;
#ifdef FILE_IO
else if (s[0] == 'w')
m |= FILE_O_WRITE;
else if (s[0] == 'a')
m |= FILE_O_WRITE;
#endif
else if (s[0] == 'A')
{
m |= FILE_O_WRITE | FILE_O_APPEND;
buffer[p - 1] = 'a';
}
else
return NULL;
if (s[1] == '+') {
if (s[0] == 'r')
#ifdef FILE_IO
m |= FILE_O_WRITE;
#else
return NULL;
#endif
else
m |= FILE_O_READ;
buffer[p++] = '+';
} else if (s[1] != '-') {
return NULL;
}
if (s[2] == 't')
t = file_type_text;
else if (s[2] == 'b') {
t = file_type_binary;
buffer[p++] = 'b';
} else
return NULL;
if (s[3] == 'f')
m |= FILE_O_FLUSH;
else if (s[3] != 'n')
return NULL;
*type = t;
*mode = m;
buffer[p] = 0;
return buffer;
}
/***************************************************************
* Various error handlers
***************************************************************/
package
file_make_error(const char *errtype, const char *msg)
{
package p;
Var value;
value.type = TYPE_STR;
value.v.str = str_dup(errtype);
p.kind = BI_RAISE;
p.u.raise.code.type = TYPE_ERR;
p.u.raise.code.v.err = E_FILE;
p.u.raise.msg = str_dup(msg);
p.u.raise.value = value;
return p;
}
package
file_raise_errno(const char *value_str)
{
char *strerr;
if (errno) {
strerr = strerror(errno);
return file_make_error(value_str, strerr);
} else {
return file_make_error("End of file", "End of file");
}
}
package
file_raise_notokcall(const char *funcid, Objid progr)
{
return make_error_pack(E_PERM);
}
package
file_raise_notokfilename(const char *funcid, const char *pathname)
{
Var p;
p.type = TYPE_STR;
p.v.str = str_dup(pathname);
return make_raise_pack(E_INVARG, "Invalid pathname", p);
}
/***************************************************************
* Security verification
***************************************************************/
int
file_verify_caller(Objid progr)
{
return is_wizard(progr);
}
int
file_verify_path(const char *pathname)
{
/*
* A pathname is OK does not contain a
* any of instances the substring "/."
*/
if (pathname[0] == '\0')
return 1;
if ((strlen(pathname) > 1) && (pathname[0] == '.') && (pathname[1] == '.'))
return 0;
if (strindex(pathname, "/.", 0))
return 0;
return 1;
}
#ifdef FILE_IO_LOGGER
int file_allowed_mode(file_mode *rmode) {
if (!(*rmode & FILE_O_LOG))
return 1;
if (*rmode & FILE_O_APPEND)
return 1;
return !(*rmode & FILE_O_WRITE);
}
#endif
/***************************************************************
* Common code for FHANDLE-using functions
**************************************************************/
FILE *
file_handle_file_safe(Var handle)
{
if (!file_handle_valid(handle))
return NULL;
else
return file_handle_file(handle);
}
const char *
file_handle_name_safe(Var handle)
{
if (!file_handle_valid(handle))
return NULL;
else
return file_handle_name(handle);
}
/***************************************************************
* Common code for file opening functions
***************************************************************/
const char *
file_resolve_path(const char *pathname)
{
static Stream *s = 0;
#ifdef FILE_IO_LOGGER
int islog = 0;
#endif
if (!s)
s = new_stream(strlen(pathname) + strlen(FILE_SUBDIR) + 1);
if (!file_verify_path(pathname))
return NULL;
#ifdef FILE_IO_LOGGER
if (!strncmp(pathname, logger_pfx, LOGGER_PFX_LEN))
{
pathname += LOGGER_PFX_LEN;
islog = 1;
}
#ifndef FILE_IO
else
return NULL;
#endif /* ! FILE_IO */
#endif /* FILE_IO_LOGGER */
while(pathname[0] == '/')
++pathname;
#ifdef FILE_IO_LOGGER
if (islog)
stream_add_string(s, FILE_IO_LOGGER_SUBDIR);
else
#endif
stream_add_string(s, FILE_SUBDIR);
stream_add_string(s, pathname);
return reset_stream(s);
}
#ifdef FILE_IO_LOGGER
int file_log_insert_id(file_mode *rmode, const char **filename, const char **real_filename) {
if (strncmp(*filename, logger_pfx, LOGGER_PFX_LEN))
return 0;
if (!(*rmode & FILE_O_WRITE))
return 0;
{
static Stream *s = 0;
const char *pathname = *filename + LOGGER_PFX_LEN;
if (!s)
s = new_stream(strlen(*filename) + 64);
*rmode |= FILE_O_LOG;
stream_add_string(s, logger_pfx);
{
static unsigned int counter = 0;
#ifdef FILE_IO_LOGGER_FORMAT_TIME
time_t c = time(0);
char time[256];
if (!strftime(time, 256, FILE_IO_LOGGER_FORMAT_TIME, gmtime(&c)))
return 1;
#endif
++counter;
stream_printf(s, FILE_IO_LOGGER_FORMAT, FILE_IO_LOGGER_FORMAT_VARS);
*filename = reset_stream(s);
*real_filename = file_resolve_path(*filename);
if (!*real_filename)
return 2;
}
}
return 0;
}
#endif
#ifdef FILE_IO
/***************************************************************
* Built in functions
* file_version
***************************************************************/
static package
bf_file_version(Var arglist, Byte next, void *vdata, Objid progr)
{
char tmpbuffer[50];
Var rv;
sprintf(tmpbuffer, "%s/%s", file_package_name, file_package_version);
rv.type = TYPE_STR;
rv.v.str = str_dup(tmpbuffer);
return make_var_pack(rv);
}
#endif
/***************************************************************
* File open and close.
***************************************************************/
/*
* FHANDLE file_open(STR name, STR mode)
*/
static package
bf_file_open(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle;
const char *real_filename;
const char *filename = arglist.v.list[1].v.str;
const char *mode = arglist.v.list[2].v.str;
const char *fmode;
file_mode rmode;
file_type type;
FILE *f;
mode_t old_mask;
errno = 0;
if (!file_verify_caller(progr))
r = file_raise_notokcall("file_open", progr);
else if ((real_filename = file_resolve_path(filename)) == NULL)
r = file_raise_notokfilename("file_open", filename);
else if ((fmode = file_modestr_to_mode(mode, &type, &rmode)) == NULL)
r = make_raise_pack(E_INVARG, "Invalid mode string",
var_ref(arglist.v.list[2]));
#ifdef FILE_IO_LOGGER
else if (file_log_insert_id(&rmode, &filename, &real_filename))
r = make_raise_pack(E_INVARG, "Couldn't process log filename",
var_ref(arglist.v.list[1]));
else if (!file_allowed_mode(&rmode))
r = make_raise_pack(E_PERM, "Mode string not permitted",
var_ref(arglist.v.list[2]));
#endif
else if ((fhandle = file_handle_new(filename, type, rmode)).v.num < 0)
r = make_raise_pack(E_QUOTA, "Too many files open", zero);
#if defined(FILE_IO_LOGGER) && defined(FILE_IO_LOGGER_UMASK)
else if ((rmode & FILE_O_LOG) && (
old_mask = umask(0),
umask(old_mask | S_IWUSR | S_IWGRP | S_IWOTH),
0) && 0)
r = make_raise_pack(E_NONE, "This error is impossible", zero);
#endif
else if ((f = fopen(real_filename, fmode)) == NULL) {
file_handle_destroy(fhandle);
#ifdef FILE_IO_LOGGER
if (rmode & FILE_O_LOG)
umask(old_mask);
#endif
r = file_raise_errno("file_open");
} else {
/* phew, we actually got a successfull open */
#ifdef FILE_IO_LOGGER
if (rmode & FILE_O_LOG)
umask(old_mask);
#endif
file_handle_set_file(fhandle, f);
r = make_var_pack(fhandle);
}
free_var(arglist);
return r;
}
/*
* void file_close(FHANDLE handle);
*/
static package
bf_file_close(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
FILE *f;
errno = 0;
if (!file_verify_caller(progr))
r = file_raise_notokcall("file_close", progr);
else if ((f = file_handle_file_safe(fhandle)) == NULL)
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
else {
fclose(f);
file_handle_destroy(fhandle);
r = no_var_pack();
}
free_var(arglist);
return r;
}
/*
* STR file_name(FHANDLE handle)
*/
static package
bf_file_name(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
const char *name;
Var rv;
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_name", progr);
} else if ((name = file_handle_name_safe(fhandle)) == NULL) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else {
rv.type = TYPE_STR;
rv.v.str = str_dup(name);
r = make_var_pack(rv);
}
free_var(arglist);
return r;
}
static package
bf_file_openmode(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
char buffer[5] = {0, 0, 0, 0, 0};
file_mode mode;
file_type type;
Var rv;
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_name", progr);
} else if (!file_handle_valid(fhandle)) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else {
type = file_handle_type(fhandle);
mode = file_handle_mode(fhandle);
if (mode & FILE_O_READ) {
buffer[0] = 'r';
} else if(mode & FILE_O_APPEND) {
buffer[0] = 'A';
} else if (mode & FILE_O_WRITE) {
buffer[0] = 'w';
}
if (mode & (FILE_O_READ | FILE_O_WRITE))
buffer[1] = '+';
else
buffer[1] = '-';
if (type == file_type_binary)
buffer[2] = 'b';
else
buffer[2] = 't';
if (mode & FILE_O_FLUSH)
buffer[3] = 'f';
else
buffer[3] = 'n';
rv.type = TYPE_STR;
rv.v.str = str_dup(buffer);
r = make_var_pack(rv);
}
free_var(arglist);
return r;
}
/**********************************************************
* string (line-based) i/o
**********************************************************/
/*
* common functionality of file_readline and file_readlines
*/
static const char *
file_read_line(Var fhandle, int *count)
{
static Stream *str = 0;
FILE *f;
int c;
f = file_handle_file(fhandle);
if (str == 0)
str = new_stream(FILE_IO_BUFFER_LENGTH);
while((c = fgetc(f)) != EOF && c != '\n')
stream_add_char(str, c);
if (c == EOF && stream_length(str) == 0) {
reset_stream(str);
*count = 0;
return NULL;
}
*count = stream_length(str);
return reset_stream(str);
}
/*
* STR file_readline(FHANDLE handle)
*/
static package
bf_file_readline(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
Var rv;
int len;
file_mode mode;
file_type type;
const char *line;
errno = 0;
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_readline", progr);
} else if (!file_handle_valid(fhandle)) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else if (!(mode = file_handle_mode(fhandle)) & FILE_O_READ)
r = make_raise_pack(E_INVARG, "File is open write-only", fhandle);
else {
type = file_handle_type(fhandle);
if ((line = file_read_line(fhandle, &len)) == NULL)
r = file_raise_errno("readline");
else {
static Stream *s = 0;
if (!s)
s = new_stream(80);
(type->in_filter_s)(s, line, len);
rv.type = TYPE_STR;
rv.v.str = str_dup(reset_stream(s));
r = make_var_pack(rv);
}
}
free_var(arglist);
return r;
}
/*
* STR file_readlines(FHANDLE handle, INT start, INT end)
*/
void
free_line_buffer(line_buffer *head, int strings_too)
{
line_buffer *next;
if (head) {
next = head->next;
myfree(head, M_STRUCT);
head = next;
while(head != NULL) {
next = head->next;
if (strings_too)
free_str(head->line);
myfree(head, M_STRUCT);
head = next;
}
}
}
line_buffer *
new_line_buffer(char *line)
{
line_buffer *p = mymalloc(sizeof(line_buffer), M_STRUCT);
p->line = line;
p->next = NULL;
return p;
}
static package
bf_file_readlines(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
int32 begin = arglist.v.list[2].v.num;
int32 end = arglist.v.list[3].v.num;
int32 begin_loc = 0, linecount = 0;
file_type type;
file_mode mode;
Var rv;
int current_line = 0, len = 0, i = 0;
const char *line = NULL;
FILE *f;
line_buffer *linebuf_head = NULL, *linebuf_cur = NULL;
errno = 0;
if ((begin < 1) || (begin > end))
return make_error_pack(E_INVARG);
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_readlines", progr);
} else if ((f = file_handle_file_safe(fhandle)) == NULL) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else if (!(mode = file_handle_mode(fhandle)) & FILE_O_READ)
r = make_raise_pack(E_INVARG, "File is open write-only", fhandle);
else {
/* Back to the beginning ... */
rewind(f);
/* "seek" to that line */
begin--;
while((current_line != begin)
&& ((line = file_read_line(fhandle, &len)) != NULL))
current_line++;
if (((begin != 0) && (line == NULL)) || ((begin_loc = ftell(f)) == -1))
r = file_raise_errno("read_line");
else {
static Stream *s = 0;
if (!s)
s = new_stream(80);
type = file_handle_type(fhandle);
/*
* now that we have where to begin, it's time to slurp lines
* and seek to EOF or to the end_line, whichever comes first
*/
linebuf_head = linebuf_cur = new_line_buffer(NULL);
while((current_line != end)
&& ((line = file_read_line(fhandle, &len)) != NULL)) {
(type->in_filter_s)(s, line, len);
linebuf_cur->next = new_line_buffer(
str_dup(reset_stream(s)));
linebuf_cur = linebuf_cur->next;
current_line++;
}
linecount = current_line - begin;
linebuf_cur = linebuf_head->next;
if (fseek(f, begin_loc, SEEK_SET) == -1) {
free_line_buffer(linebuf_head, 1);
r = file_raise_errno("seeking");
} else {
rv = new_list(linecount);
i = 1;
while(linebuf_cur != NULL) {
rv.v.list[i].type = TYPE_STR;
rv.v.list[i].v.str = linebuf_cur->line;
linebuf_cur = linebuf_cur->next;
i++;
}
free_line_buffer(linebuf_head, 0);
r = make_var_pack(rv);
}
}
}
free_var(arglist);
return r;
}
/*
* void file_writeline(FHANDLE handle, STR line)
*/
static package
bf_file_writeline(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
const char *buffer = arglist.v.list[2].v.str;
const char *rawbuffer;
file_mode mode;
file_type type;
int len;
FILE *f;
errno = 0;
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_writeline", progr);
} else if ((f = file_handle_file_safe(fhandle)) == NULL) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else if (!(mode = file_handle_mode(fhandle)) & FILE_O_WRITE)
r = make_raise_pack(E_INVARG, "File is open read-only", fhandle);
else {
if (mode & FILE_O_APPEND)
fseek(f, 0, SEEK_END);
type = file_handle_type(fhandle);
if ((rawbuffer = (type->out_filter)(buffer, &len)) == NULL)
r = make_raise_pack(E_INVARG, "Invalid binary string", fhandle);
else if ((fputs(rawbuffer, f) == EOF) || (fputc('\n', f) != '\n'))
r = file_raise_errno(file_handle_name(fhandle));
else {
if (mode & FILE_O_FLUSH) {
fflush(f);
}
r = no_var_pack();
}
}
free_var(arglist);
return r;
}
/********************************************************
* binary i/o
********************************************************/
/*
* STR file_read(FHANDLE handle, INT record_length)
*/
static package
bf_file_read(Var arglist, Byte next, void *vdata, Objid progr)
{
package r;
Var fhandle = arglist.v.list[1];
file_mode mode;
file_type type;
int32 record_length = arglist.v.list[2].v.num;
int32 read_length;
char buffer[FILE_IO_BUFFER_LENGTH];
Var rv;
static Stream *str = 0;
int len = 0, read = 0;
FILE *f;
errno = 0;
read_length = (record_length > sizeof(buffer)) ? sizeof(buffer) : record_length;
if (str == 0)
str = new_stream(FILE_IO_BUFFER_LENGTH);
if (!file_verify_caller(progr)) {
r = file_raise_notokcall("file_read", progr);
} else if ((f = file_handle_file_safe(fhandle)) == NULL) {
r = make_raise_pack(E_INVARG, "Invalid FHANDLE", fhandle);
} else if (!(mode = file_handle_mode(fhandle)) & FILE_O_READ)
r = make_raise_pack(E_INVARG, "File is open write-only", fhandle);
else {
type = file_handle_type(fhandle);