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buffer.c
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/*
* FED - Folding Editor
*
* By Shawn Hargreaves, 1994
*
* See README.TXT for copyright conditions
*
* Code for managing buffers: load/save/print etc.
*/
#include <ctype.h>
#ifdef DJGPP
#include <dir.h>
#endif
#ifdef TARGET_CURSES
#include <unistd.h>
#include <sys/stat.h>
#endif
#include "fed.h"
#define LINE_LENGTH 16384 /* point at which the line wraps on read */
#define BINARY_LENGTH 64 /* line length in binary mode */
#define HEX_LENGTH 16 /* number of hex characters on a line */
void already_open(int c, int flags)
{
int c2;
BUFFER *buf=buffer[c];
for(c2=c;c2>0;c2--)
buffer[c2]=buffer[c2-1];
buffer[0]=buf;
if ((flags & BUF_BINARY) || (flags & BUF_HEX) || (flags & BUF_ASCII))
alert_box("File is already open - switching to the existing copy");
}
char scan_file[256];
int scan_flags;
int scan_found;
int scan_for_file(char *n, int depth)
{
char name[256];
if (strstr(n, ".."))
return 0;
strcpy(name, n);
strcpy(get_fname(name), scan_file);
cleanup_filename(name);
do_the_read(name, scan_flags);
if (!errno) {
scan_found = TRUE;
errno = -1;
}
else {
errno = 0;
if (depth > 0) {
#if (defined TARGET_DJGPP) || (defined TARGET_WIN)
strcpy(get_fname(name), "*.*");
#else
strcpy(get_fname(name), "*");
#endif
do_for_each_directory(name, scan_for_file, depth-1);
}
}
return errno;
}
int read_file(char *n, int flags)
{
/* try to read a file, and add it to the buffer list */
int c;
char name[256];
char path[256];
strcpy(name, n);
errno=0;
cleanup_filename(name);
for (c=0;c<buffer_count;c++) { /* see if it is already loaded */
if (stricmp(name,buffer[c]->name)==0) {
already_open(c, flags);
return 0;
}
}
if (get_fname(n) == n) {
for (c=0;c<buffer_count;c++)
if (stricmp(n,get_fname(buffer[c]->name))==0) {
already_open(c, flags);
return 0;
}
}
do_for_each_file(name, do_the_read, flags);
if (((errno==ENMFILE) || (errno==ENOENT)) && (!strpbrk(name, "*?["))) {
if ((config.file_search > 0) && (!strpbrk(n, "/\\:"))) {
strcpy(message,"Scanning subdirectories");
do_display_message(0);
refresh_screen();
strcpy(path, name);
#if (defined TARGET_DJGPP) || (defined TARGET_WIN)
strcpy(get_fname(path), "*.*");
#else
strcpy(get_fname(path), "*");
#endif
strcpy(scan_file, n);
scan_flags = flags;
scan_found = FALSE;
do_for_each_directory(path, scan_for_file, config.file_search-1);
errno = (scan_found) ? 0 : ENOENT;
}
if (errno)
do_for_each_file(name, do_the_read, flags | BUF_MAKENEW);
}
if (buffer_count > 0)
if ((buffer[0]->flags & BUF_TRUNCATED) && (errno==ENOMEM))
errno = 0;
if ((errno!=0) && (errno!=-1))
alert_box(err());
return errno;
}
int do_the_read(char *n, int flags)
{
/* try to read a file, and add it to the buffer list */
BUFFER *buf=NULL;
MYFILE *f=NULL;
LINE *l=NULL;
int c, c2;
char *workspace=NULL;
char name[256];
if (buffer_count>=MAX_BUFFERS) {
alert_box("Too many open files");
errno = -1;
return -1;
}
strcpy(name, n);
cleanup_filename(name);
for (c=0;c<buffer_count;c++) { /* see if it is already loaded */
if (stricmp(name,buffer[c]->name)==0) {
buf=buffer[c];
for(c2=c;c2>0;c2--)
buffer[c2]=buffer[c2-1];
buffer[0]=buf;
return 0;
}
}
if ((buf=malloc(sizeof(BUFFER)))==NULL) {
errno=ENOMEM;
goto get_out;
}
if ((workspace=malloc(LINE_LENGTH))==NULL) {
errno=ENOMEM;
goto get_out;
}
strcpy(buf->name, (flags & BUF_BROWSE) ? "errors" : name);
buf->flags=0;
if (flags & BUF_BINARY)
buf->flags |= BUF_BINARY;
else if (flags & BUF_HEX)
buf->flags |= BUF_HEX;
else if (!(flags & BUF_ASCII)) {
if (ext_in_list(name, config.bin, NULL)) {
buf->flags |= BUF_BINARY;
flags |= BUF_BINARY;
}
else if (ext_in_list(name, config.hex, NULL)) {
buf->flags |= BUF_HEX;
flags |= BUF_HEX;
}
}
if (buf->flags & BUF_BINARY)
buf->flags |= BUF_OVERWRITE;
if (flags & BUF_BROWSE)
buf->flags |= BUF_BROWSE;
if (flags & (BUF_READONLY | BUF_FORCEREADONLY))
buf->flags |= (BUF_READONLY | BUF_FORCEREADONLY);
buf->wrap_col = 0;
if (access(name, W_OK) != 0)
buf->flags |= BUF_READONLY;
buf->filetime = file_time(name);
buf->hscroll=0;
buf->c_pos=0;
buf->old_c_pos=0;
buf->sel_line=NULL;
buf->sel_pos=0;
buf->sel_offset=0;
buf->start = buf->top = buf->c_line = NULL;
buf->cached_line = -1;
buf->_cached_line = NULL;
buf->cached_top = -1;
buf->_cached_top = NULL;
buf->cached_size = -1;
buf->undo = buf->redo = NULL;
buf->last_function = -1;
buf->syntax = NULL;
f = open_file(name, FMODE_READ);
if (errno!=0) {
if (((errno==ENMFILE) || (errno==ENOENT)) && (flags & BUF_MAKENEW)) {
errno=0;
buf->flags |= BUF_NEW;
buf->flags &= ~BUF_READONLY;
#ifndef DJGPP
buf->flags |= BUF_UNIX;
#endif
buf->start = buf->top = buf->c_line = create_line(0);
if (buf->start==NULL)
errno=ENOMEM;
}
goto get_out;
}
strcpy(message,"Reading ");
if (flags & BUF_BINARY)
strcat(message,"(bin) ");
else if (flags & BUF_HEX)
strcat(message,"(hex) ");
strcat(message,name);
do_display_message(0);
refresh_screen();
if (flags & BUF_BROWSE) {
l = create_line(10);
memmove(l->text, "<messages>", 10);
}
else
l=read_line(f, flags, &buf->flags, workspace); /* read first line */
if ((errno==0) || (errno==EOF)) {
buf->start = buf->top = buf->c_line = l;
l->line_no = 1;
}
c = 1;
while (errno==0) { /* read the other lines */
l->next = l->fold = read_line(f,flags,&buf->flags,workspace);
if (l->next) { /* set up the links */
l->next->prev = l;
l->next->line_no = ++c;
l = l->next;
}
}
close_file(f);
if (errno == EOF)
errno = 0;
if (errno==ENOMEM) { /* ask whether to truncate or abort */
if (ask("Error", "Out of memory: truncate", NULL)) {
buf->flags |= BUF_TRUNCATED;
errno=0;
}
}
get_out:
if (workspace)
free(workspace);
if (errno!=0) { /* in case of errors */
if (buf)
destroy_buffer(buf);
}
else { /* store the file information */
if ((ext_in_list(name, config.auto_indent, buf)) || (flags & BUF_INDENT))
buf->flags |= BUF_INDENT;
if ((ext_in_list(name, config.wrap, buf)) || (flags & BUF_WORDWRAP))
buf->wrap_col = config.wrap_col;
buf->syntax = get_syntax(buf->name, buf);
for (c=buffer_count; c>0; c--)
buffer[c]= buffer[c-1];
buffer_count++;
buffer[0] = buf;
buffer[0]->undo = new_undo_node(NULL);
if (buf->flags & BUF_TRUNCATED)
errno = ENOMEM;
if ((!(flags & BUF_BINARY)) && (!(flags & BUF_HEX)))
if ((flags & BUF_FOLD) || (ext_in_list(name,config.auto_fold, buf)))
fold_all();
}
return errno;
}
LINE *read_line(MYFILE *f, int flags, int *flag_ret, char *workspace)
{
/* reads a line from the file. Errors are reported in errno */
int c; /* temporary character store */
int len=0; /* line length */
char *p; /* current text pos, for speed */
LINE *l; /* the line */
p=workspace;
if (flags & BUF_BINARY) { /* easy case... */
while (len<BINARY_LENGTH) {
*p = get_char(f);
if (errno != 0)
goto get_out;
len++;
p++;
}
}
else if (flags & BUF_HEX) { /* this is pretty easy as well... */
while (len<HEX_LENGTH) {
c = get_char(f);
if (errno != 0)
goto get_out;
*(p++) = hex_digit[c >> 4];
*(p++) = hex_digit[c & 15];
*(p++) = ' ';
len++;
}
}
else { /* have to do some more work to deal with text files */
while (len<LINE_LENGTH) {
c = get_char(f);
if (errno != 0)
goto get_out;
if (c==CR) { /* EOL, nice and flexible */
*flag_ret &= ~BUF_UNIX;
if (peek_char(f)==LF)
get_char(f);
goto get_out;
}
if (c==LF) {
*flag_ret |= BUF_UNIX;
goto get_out;
}
if ((config.load_tabs != 0) && (c==TAB)) { /* fake tabs */
do {
*(p++)=' ';
len++;
} while (((len/config.load_tabs)*config.load_tabs != len) && (len<LINE_LENGTH));
}
else { /* actually insert the character */
*(p++)=c;
len++;
}
}
*flag_ret |= BUF_WRAPPED;
}
get_out: /* store the results */
if ((errno!=0) && (errno!=EOF))
return NULL;
c=(int)(p-workspace); /* length of the text */
if ((l=create_line(c)) != NULL) { /* put everything into a line */
l->length = l->size = c;
memmove(l->text, workspace, c);
}
else
errno=ENOMEM;
return l;
}
void destroy_buffer(BUFFER *b) /* free up a buffer */
{
LINE *pos, *prev;
if (b) {
pos=b->start;
while(pos) {
prev=pos;
pos=pos->next;
if (prev->text)
free(prev->text);
free(prev);
}
destroy_undolist(b->undo);
destroy_undolist(b->redo);
free(b);
}
}
void fn_close() /* close the current buffer */
{
int c;
if (buffer[0]->flags & BUF_CHANGED)
if (!ask("Close", "Abandon changes to ", buffer[0]->name))
return;
destroy_buffer(buffer[0]);
buffer_count--;
for (c=0;c<buffer_count;c++)
buffer[c]=buffer[c+1];
if (buffer_count > 0) {
for (c=0; c<buffer_count; c++) {
if (((!(buffer[c]->flags & BUF_BROWSE)) &&
(!(buffer[c]->flags & BUF_KILL))) ||
(buffer[c]->flags & BUF_CHANGED)) {
display_new_buffer();
return;
}
}
}
fn_quit();
}
void fn_quit() /* quit, prompting if there are unsaved buffers */
{
int c;
for (c=0;c<buffer_count;c++) {
if (buffer[c]->flags & BUF_CHANGED) {
if (!ask("Quit", "Abandon Changes", NULL))
return;
else
break;
}
}
for (c=0;c<buffer_count;c++)
destroy_buffer(buffer[c]);
buffer_count = 0;
exit_flag = 1;
}
void fn_help() /* display the help file */
{
int c, c2;
BUFFER *buf;
LINE *l, *last;
extern char *help_text[];
for (c=0;c<buffer_count;c++) { /* already loaded? */
if (stricmp("help", buffer[c]->name)==0) {
buf=buffer[c];
for(c2=c;c2>0;c2--)
buffer[c2]=buffer[c2-1];
buffer[0]=buf;
display_new_buffer();
return;
}
}
errno = 0;
buf=malloc(sizeof(BUFFER));
if (!buf) {
errno = ENOMEM;
}
else {
strcpy(buf->name, "help");
buf->flags = BUF_READONLY | BUF_FORCEREADONLY;
buf->filetime = -1;
buf->wrap_col = 0;
buf->hscroll=0;
buf->c_pos=0;
buf->old_c_pos=0;
buf->sel_line=NULL;
buf->sel_pos=0;
buf->sel_offset=0;
buf->start = buf->top = buf->c_line = NULL;
buf->cached_line = -1;
buf->cached_top = -1;
buf->cached_size = -1;
buf->undo = NULL;
buf->redo = NULL;
buf->last_function = -1;
buf->syntax = NULL;
last = NULL;
for (c=0; help_text[c]; c++) {
l = create_line(strlen(help_text[c]));
if (!l) {
destroy_buffer(buf);
return;
}
memmove(l->text, help_text[c], strlen(help_text[c]));
if (last) {
l->prev = last;
last->next = last->fold = l;
}
else
buf->start = buf->top = buf->c_line = l;
last = l;
}
}
if (errno) {
alert_box(err());
errno=0;
}
else {
for (c=buffer_count; c>0; c--)
buffer[c]= buffer[c-1];
buffer_count++;
buffer[0]=buf;
fold_all();
}
display_new_buffer();
}
int update_file_status()
{
int c, i;
long t;
int flags;
char name[256];
int changed = FALSE;
int changed_this_time;
if (!config.check_files)
return FALSE;
do {
changed_this_time = FALSE;
for (i=0; i<buffer_count; i++) {
if (file_exists(buffer[i]->name)) {
if (!(buffer[i]->flags & BUF_FORCEREADONLY)) {
if (access(buffer[i]->name, W_OK) != 0)
buffer[i]->flags |= BUF_READONLY;
else
buffer[i]->flags &= ~BUF_READONLY;
}
t = file_time(buffer[i]->name);
if ((t >= 0) && (buffer[i]->filetime >= 0) &&
(t > buffer[i]->filetime)) {
if (ask("File Changed", "Reload ", buffer[i]->name)) {
strcpy(name, buffer[i]->name);
flags = buffer[i]->flags & (BUF_BINARY | BUF_HEX | BUF_ASCII |
BUF_FORCEREADONLY);
destroy_buffer(buffer[i]);
buffer_count--;
for (c=i;c<buffer_count;c++)
buffer[c]=buffer[c+1];
read_file(name, flags);
display_new_buffer();
changed = changed_this_time = TRUE;
}
else
buffer[i]->filetime = t;
}
}
}
} while (changed_this_time);
return changed;
}
void run_tool(char *cmd, char *desc)
{
char path[256];
static char user_input[80] = "";
char buf[80];
char command[256];
int saved = FALSE;
int c, c2;
int ret;
char *p;
int save_altered = TRUE;
int hold_screen = TRUE;
int read_errors = FALSE;
int filter = FALSE;
int filter_redir = FALSE;
BUFFER *kill;
LINE *l;
#if (defined DJGPP) || (defined TARGET_WIN)
int disk;
#endif
while ((*cmd) && (*cmd != '|')) /* skip command menu description */
cmd++;
if (*cmd)
cmd++;
if (*cmd == 0) {
alert_box("No command in tool definition");
return;
}
c = 0;
while ((*cmd) && (c < 160)) { /* parse command tokens */
if (*cmd == '%') {
cmd++;
switch (*(cmd++)) {
case 'e': /* environment variable */
case 'E':
c2 = 0;
while ((*cmd) && (*cmd != '%'))
buf[c2++] = *(cmd++);
buf[c2] = 0;
if (*cmd)
cmd++;
strupr(buf);
p = getenv(buf);
if (p) {
strcpy(command+c, p);
while (command[c])
c++;
}
break;
case 'f': /* name of the current file */
case 'F':
strcpy(command+c, buffer[0]->name);
while (command[c])
c++;
break;
case 'h': /* don't hold screen */
case 'H':
hold_screen = FALSE;
break;
case 'n': /* use the tool as a text filter */
filter_redir = TRUE;
/* fall through */
case 'N':
if (buffer[0]->flags & BUF_READONLY) {
strcpy(message,"File is read-only");
display_message(MESSAGE_KEY);
return;
}
filter = TRUE;
break;
case 'p': /* prompt user for text */
case 'P':
if (input_text(desc, user_input, 60, is_anychar)==ESC)
return;
strcpy(command+c, user_input);
while (command[c])
c++;
break;
case 's': /* don't save altered files */
case 'S':
save_altered = FALSE;
break;
case 'w': /* word under the cursor */
case 'W':
get_word(command+c);
if (!command[c]) {
if (input_text(desc, user_input, 60, is_anychar)==ESC)
return;
strcpy(command+c, user_input);
}
while (command[c])
c++;
break;
}
}
else
command[c++] = *(cmd++);
}
if (filter) {
if (filter_redir)
strcpy(command+c, " < " FILT_IN_FILE " > " FILT_OUT_FILE);
else
command[c] = 0;
if (is_selecting(buffer[0]))
fn_copy();
else
destroy_kill_buffer(FALSE);
kill = find_kill_buffer();
strcpy(buf, kill->name);
strcpy(kill->name, FILT_IN_FILE);
write_file(kill);
strcpy(kill->name, buf);
if (errno != 0) {
n_vid();
dirty_everything();
return;
}
if (hold_screen) {
goto2(0,screen_h-1);
cr_scroll();
saved = TRUE;
}
}
else
command[c] = 0;
if (save_altered) {
for (c=0; c<buffer_count; c++) { /* save altered files */
if (buffer[c]->flags & BUF_CHANGED) {
write_file(buffer[c]);
if (errno != 0) {
n_vid();
dirty_everything();
return;
}
if ((!filter) || (hold_screen)) {
goto2(0,screen_h-1);
cr_scroll();
saved = TRUE;
}
}
}
}
goto2(0,screen_h-1);
if ((!saved) && ((!filter) || (hold_screen)))
cr_scroll();
tattr(norm_attrib);
mywrite(command);
del_to_eol();
if ((!filter) || (hold_screen)) {
cr_scroll();
del_to_eol();
}
#if (defined DJGPP) || (defined TARGET_WIN)
disk = getdisk();
#endif
getcwd(path, 256);
show_c();
term_suspend((!filter) || (hold_screen));
delete_file(ERROR_FILE);
errno = 0;
ret = system(command); /* run it! */
c = (errno == EACCES) ? 0 : errno;
chdir(path);
#if (defined DJGPP) || (defined TARGET_WIN)
setdisk(disk);
#endif
if (file_size(ERROR_FILE) > 0) {
read_errors = TRUE;
term_reinit(FALSE);
}
else if ((ret) || (c) || (hold_screen)) {
if (ret) {
itoa(ret, buf, 10);
printf("\nExit code %s", buf);
}
else if ((c) && (c != ENOENT)) {
errno = c;
printf("\n<%s>", err());
}
#ifndef TARGET_WIN
printf("\n<press a key>");
fflush(stdout);
#endif
term_reinit(TRUE);
}
else
term_reinit(FALSE);
n_vid();
tattr(attrib);
dirty_everything();
if (read_errors) {
for (c=0; c<buffer_count; c++) {
if (buffer[c]->flags & BUF_BROWSE) {
destroy_buffer(buffer[c]);
buffer_count--;
for (c2=c; c2<buffer_count; c2++)
buffer[c2] = buffer[c2+1];
}
else {
l = buffer[c]->start;
c2 = 1;
while (l) {
l->line_no = c2++;
l = l->next;
}
}
}
read_file(ERROR_FILE, BUF_BROWSE); /* read error list */
strcpy(buf,"Exit code ");
itoa(ret, buf+strlen(buf), 10);
l=buffer[0]->start;
while (l->next)
l = l->next;
l->next = l->fold = create_line(strlen(buf));
memmove(l->next->text, buf, strlen(buf));
l->next->prev = l;
display_new_buffer();
browse_goto(0, FALSE);
}
else if ((filter) && ((!ret) && (!c)) && (file_size(FILT_OUT_FILE) > 0)) {
destroy_kill_buffer(TRUE);
read_file(FILT_OUT_FILE, 0);
if (errno == 0) {
kill = buffer[0];
buffer[0] = buffer[1];
buffer[1] = kill;
kill->flags |= BUF_KILL;
fn_yank();
destroy_kill_buffer(TRUE);
}
update_file_status();
}
else
update_file_status();
if (filter) {
delete_file(FILT_IN_FILE);
delete_file(FILT_OUT_FILE);
}
delete_file(ERROR_FILE);
errno = 0;
}
#define TOOL_FUNC(x) \
void fn_tool ## x() { run_tool(config.tool[x-1], tool_str[x-1]); }
TOOL_FUNC(1);
TOOL_FUNC(2);
TOOL_FUNC(3);
TOOL_FUNC(4);
TOOL_FUNC(5);
TOOL_FUNC(6);
TOOL_FUNC(7);
TOOL_FUNC(8);
TOOL_FUNC(9);
TOOL_FUNC(10);
TOOL_FUNC(11);
TOOL_FUNC(12);
TOOL_FUNC(13);
TOOL_FUNC(14);
TOOL_FUNC(15);
TOOL_FUNC(16);
void scan_for_filename(char *str)
{
LINE *l = buffer[0]->c_line;
int pos = buffer[0]->c_pos;
int len = 0;
int c = char_from_line(l,pos);
if ((c == '"') || (c == '<') || (c == '\'')) {
pos++;
c = char_from_line(l,pos);
}
if (is_filechar_nospace(c)) {
while (is_filechar_nospace(c)) {
pos--;
c = char_from_line(l, pos);
}
if ((c != '"') && (c != '<') && (c != '\'')) {
str[0] = 0;
return;
}
pos++;
c = char_from_line(l, pos);
while (is_filechar_nospace(c)) {
str[len++] = l->text[pos];
str[len] = 0;
pos++;
c = char_from_line(l, pos);
}
if ((c != '"') && (c != '>') && (c != '\'')) {
str[0] = 0;
return;
}
if (str[0]) {
char fname[256];
if (search_path(fname, str, "", "INCLUDE"))
strcpy(str, fname);
else if (search_path(fname, str, "", "FED_INCLUDE"))
strcpy(str, fname);
cleanup_filename(str);
errno = 0;
}
}
else
str[0] = 0;
}