File: textbuf.c

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/***********************************************************************
 *
 * Module: textbuf.c
 * Author: Marc van Kempen (marc@bowtie.nl)
 * Desc:   Textbuffer manipulation routines. Implementation of a
 *     texteditor
 *
 * Copyright (c) 1996, Marc van Kempen
 *
 * All rights reserved.
 *
 * This software may be used, modified, copied, distributed, and
 * sold, in both source and binary form provided that the above
 * copyright and these terms are retained, verbatim, as the first
 * lines of this file.  Under no circumstances is the author
 * responsible for the proper functioning of this software, nor does
 * the author assume any responsibility for damages incurred with
 * its use.
 *
 ***********************************************************************/

/*
 * Copyright(c) 1997-1998 by Gennady B. Sorokopud (gena@NetVision.net.il)
 *
 * This software can be freely redistributed and modified for
 * non-commercial purposes as long as above copyright
 * message and this permission notice appear in all
 * copies of distributed source code and included as separate file
 * in binary distribution.
 *
 * Any commercial use of this software requires author's permission.
 *
 * This software is provided "as is" without expressed or implied
 * warranty of any kind.
 * Under no circumstances is the author responsible for the proper
 * functioning of this software, nor does the author assume any
 * responsibility for damages incurred with its use.
 *
 */

/*       $Id: textbuf.c,v 1.3 1999/11/07 22:27:53 xfmail Exp $
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "textbuf.h"
#include "fl_error.h"

#ifndef TRUE
    #define TRUE 1
#endif
#ifndef FALSE
    #define FALSE 0
#endif

#define TB_BUFINC   80      /* to be added space to an existing buffer */
#define TB_TABLEN   8       /* default tablen */

#define tb_error fl_edit_error

/***********************************************************************
 *
 * Textbuffer manipulation functions
 *
 ***********************************************************************/

void tb_init(TextBuf * tb)
/*
 * Desc: initialize the textbuffer structure
 * Pre:  <tb> is a pointer to an existing TextBuf structure
 * Post: <tb> has been initialized
 */ {
    tb->firstline = NULL;
    tb->currentline = NULL;
    tb->lastline = NULL;
    tb->n = 0;
    tb->i = 0;
    tb->bufchanged = FALSE;
    tb->tablen = TB_TABLEN;
    tb->bgcolor_def = 0;
    tb->fgcolor_def = 1;
    tb->linewrap = 0;
    tb->flags = 0;
    tb->maxchars = 0;
    tb->attr_def = ATTR_EMPTY;

    return;
}               /* tb_init() */

void tb_clear(TextBuf * tb)
/*
 * Desc: release the textbuffer, free the used memory by the TextLine
 *   structures.
 */ {
    TextLine *tl, *tlold;

    /* free the memory */
    tl = tb->firstline;
    while(tl) {
        tlold = tl;
        if(tl->buf)
            free(tl->buf);
        if(tl->attr)
            free(tl->attr);
        tl = tl->next;
        free(tlold);
    }

    /* initialize the structure */
    tb->firstline = NULL;
    tb->currentline = NULL;
    tb->lastline = NULL;
    tb->n = 0;
    tb->i = 0;
    tb->bufchanged = FALSE;
    tb->maxchars = 0;

    return;
}               /* tb_clear() */


/***********************************************************************
 *
 * Retrieval
 *
 ***********************************************************************/

int tb_get_char(TextBuf * tb, int n, char *ch)
/*
 * Desc: retrieve a single character from the n-th position in the
 *   current line.
 * Pre:  ch is a pointer to a char variable,
     n < strlen(currentline)
 * Post: *ch contains the retrieved value
 */ {
    if(n < tb->currentline->strlen) {
        *ch = tb->currentline->buf[n];
        return(TRUE);
    } else {
        return(FALSE);
    }

}               /* tb_get_char() */

void tb_get_line(TextBuf * tb, char **line)
/*
 * Desc: retrieve the current line
 * Pre:  *line is a pointer to a character buffer, not allocated
 * Post: *line points to the line requested
 */ {
    if(tb->currentline) {
        *line = tb->currentline->buf;
    } else {
        *line = NULL;
    }

    return;
}               /* tb_get_line() */

char *tb_return_line(TextBuf * tb)
/*
 * Desc: returns pointer to the text of current line
 */ {
    return tb->currentline ? tb->currentline->buf : NULL;
}               /* tb_return_line() */

TextLine *tb_get_lineptr_by_num(TextBuf * tb, int n)
/*
 * Desc: returns pointer to the line with number <n>
 */ {
    int i;
    TextLine *tl;

    i = 0;
    tl = tb->firstline;
    while(tl && i < n) {
        tl = tl->next;
        i++;
    }
    if(tl && i == n) {
        /* we've got the right line */
        return tl;
    } else {
        /* the line does not exist */
        return NULL;
    }

    return NULL;
}

void tb_get_line_by_num(TextBuf * tb, char **line, int n)
/*
 * Desc: retrieve the line with number <n>
 * Pre:  *line is a pointer to a character buffer, not allocated
 * Post: *line points to the line requested
 */ {
    int i;
    TextLine *tl;

    i = 0;
    tl = tb->firstline;
    while(tl && i < n) {
        tl = tl->next;
        i++;
    }
    if(tl && i == n) {
        /* we've got the right line */
        *line = tl->buf;
        return;
    } else {
        /* the line does not exist */
        *line = NULL;
        return;
    }
}

void
tb_set_block_attr(TextBuf * tb, int r0, int c0, int r1, int c1, int attr)
/*
 * Desc: set attrbutes of specific block
 */ {
    int i, k, rtop, rbottom;
    struct TextLine *tl;

    if(r0 > r1) {
        rtop = r0;
        rbottom = r1;
    } else {
        rtop = r1;
        rbottom = r0;
    }

    if(rtop == rbottom) {
        if((tl = tb_get_lineptr_by_num(tb, rtop)) == NULL)
            return;

        if(c0 < 0)
            c0 = tl->strlen;
        if(c1 < 0)
            c1 = tl->strlen;

        if(c1 < c0) {
            i = c0;
            c0 = c1;
            c1 = i;
        }

        if(c1 > tl->strlen)
            c1 = tl->strlen;

        if(c0 > tl->strlen)
            c0 = tl->strlen;

        if(c0 == c1)
            return;

        for(i = c0; i < c1; i++)
            tl->attr[i] = attr;

        tl->flags |= TLINE_MODIFIED;

        return;
    }

    for(i = rbottom; i <= rtop; i++) {
        if((tl = tb_get_lineptr_by_num(tb, i)) == NULL)
            continue;

        if(i == rbottom) {
            if(c0 >= tl->strlen)
                continue;
            for(k = c0; k < tl->strlen; k++)
                tl->attr[k] = attr;
        } else if(i == rtop) {
            if((c1 >= tl->strlen) || (c1 < 0))
                c1 = tl->strlen;
            for(k = 0; k < c1; k++)
                tl->attr[k] = attr;
        } else {
            for(k = 0; k < tl->strlen; k++)
                tl->attr[k] = attr;
        }

        tl->flags |= TLINE_MODIFIED;
    }

    return;
}

void tb_get_block(TextBuf * tb, int r0, int c0, int r1, int c1, char **buf)
/*
 * Desc: retrieve a block of characters from the TextBuf <tb> and copy
 *   it into a to be allocated buffer <buf>
 */ {
    int i, addcr, rtop, rbottom, buflen, llen;
    char *block, *line;

    if(r0 > r1) {
        rtop = r0;
        rbottom = r1;
    } else {
        rtop = r1;
        rbottom = r0;
    }

    *buf = NULL;
    block = (char *) malloc(1);
    block[0] = '\0';
    buflen = 1;
    addcr = 0;

    if(rtop == rbottom) {
        tb_get_line_by_num(tb, &line, rtop);
        if(line == NULL)
            return;
        llen = strlen(line);
        if(c0 < 0)
            c0 = llen;
        if(c1 < 0)
            c1 = llen;

        if(c1 < c0) {
            i = c0;
            c0 = c1;
            c1 = i;
        }

        if(c1 > llen)
            c1 = llen;

        if(c0 > llen)
            c0 = llen;

        if(c0 == c1)
            return;

        buflen += (c1 - c0);
        if(c0 == 0) {
            addcr = 1;
            buflen++;
        }

        block = (char *) realloc(block, buflen);
        strncat(block, line + c0, c1 - c0);
        if(addcr)
            strcat(block, "\n");
        *buf = block;
        return;
    }

    for(i = rbottom; i <= rtop; i++) {
        tb_get_line_by_num(tb, &line, i);
        if(line == NULL)
            continue;

        if(i == rbottom) {
            if(c0 >= strlen(line))
                continue;
            buflen += strlen(line) - c0;
            if(i < rtop)
                buflen++;
            block = (char *) realloc(block, buflen);
            strcat(block, line + c0);
            if(i < rtop)
                strcat(block, "\n");
        } else if(i == rtop) {
            if((c1 >= strlen(line)) || (c1 < 0)) {
                c1 = strlen(line) + 1;
                addcr = 1;
            }
            buflen += c1;
            block = (char *) realloc(block, buflen);
            strncat(block, line, c1);
            if(addcr)
                strcat(block, "\n");
        } else {
            buflen += (strlen(line) + 1);
            block = (char *) realloc(block, buflen);
            strcat(block, line);
            strcat(block, "\n");
        }
    }

    *buf = block;

    return;
}               /* tb_get() */

void tb_get_rect(TextBuf * tb, int r0, int c0, int r1, int c1, char **buf)
/*
 * Desc: retrieve a rectangular block of characters from the TextBuf <tb>
 *   and copy it into a newly allocated buffer <buf>
 */ {

    return;
}               /* tb_get_rect() */


/***********************************************************************
 *
 * Insertion
 *
 ***********************************************************************/

int tb_insert_char(TextBuf * tb, int n, char ch)
/*
 * Desc: insert the character <ch> into <tb> at the n-th position
 *   in the current line.
 * returns number of characters added or minus this number if the line
 * was wrapped
 */ {
    TextLine *tl;
    int i, added;
    char *newbuf;

    /* get the current TextLine */
    tl = tb->currentline;

    /* check if there is a current line at all */
    if(!tb->currentline) {
        /* allocate a line */
        tb_insert_line(tb, "");
        tl = tb->currentline;
    }

    /* check if the character can be fitted in the buffer */
    tl->flags |= TLINE_MODIFIED;
    if(tl->strlen + 1 >= tl->buflen) {
        /* reallocate the buffer space and add a fixed amount of space
           to it */
        newbuf = (char *) realloc(tl->buf, tl->buflen + TB_BUFINC);
        if(!newbuf) {
            tb_error
            ("tb_insert_char(): Could not realloc, character not inserted");
            return 0;
        }
        tl->buf = newbuf;

        newbuf = (char *) realloc(tl->attr, tl->buflen + TB_BUFINC);
        if(!newbuf) {
            tb_error
            ("tb_insert_char(): Could not realloc attr, character not inserted");
            return 0;
        }
        tl->attr = newbuf;

        tl->buflen = tl->buflen + TB_BUFINC;
    }

    /* first move the charachter after n one position */
    for(i = tl->strlen; i >= n; i--) {
        tl->buf[i + 1] = tl->buf[i];
        tl->attr[i + 1] = tl->attr[i];
    }
    /* now insert the character */
    tl->buf[n] = ch;
    tl->attr[n] = tb->attr_def;

    /* adjust strlen */
    tl->strlen++;
    tb->bufchanged = TRUE;

    if(ch == '\t')
        added = tb_handle_tabs(tb);
    else
        added = 1;
    i = tb_reformat(tb);
    tb_fix_line(tl);

    return i ? -1 * added : added;

}               /* tb_insert_char() */

void tb_insert_line(TextBuf * tb, char *line)
/*
 * Desc: insert the line <line> into <tb>
 */ {
    TextLine *tlnew;
    int i;

    /* Allocate a new TextLine buffer */
    tlnew = (TextLine *) malloc(sizeof(TextLine));
    if(!tlnew) {
        tb_error("tb_insert_line(): could not malloc textline");
        return;
    }
    /* allocate a new line buffer and copy the line into it */
    tlnew->buf = (char *) malloc(strlen(line) + 1);
    if(!tlnew->buf) {
        tb_error("tb_insert_line(): could not malloc line buffer");
        free(tlnew);
        return;
    }
    strcpy(tlnew->buf, line);
    tlnew->strlen = strlen(line);

    tlnew->attr = (char *) malloc(tlnew->strlen + 1);
    if(!tlnew->attr) {
        tb_error("tb_insert_line(): could not malloc line attr buffer");
        free(tlnew->buf);
        free(tlnew);
        return;
    }
    for(i = 0; i < tlnew->strlen; i++)
        tlnew->attr[i] = tb->attr_def;
    tlnew->attr[tlnew->strlen] = '\0';

    tlnew->buflen = strlen(line) + 1;
    tlnew->bgcolor = tb->bgcolor_def;
    tlnew->fgcolor = tb->fgcolor_def;
    tlnew->cont = NULL;
    tlnew->flags = TLINE_MODIFIED;
    tlnew->clk_callback = NULL;
    tlnew->dbl_callback = NULL;
    tlnew->cur_callback = NULL;
    tlnew->callback_data = 0;

    /* check if there are any lines */
    if(tb->currentline) {
        /* insert the new TextLine in the linked list */
        tlnew->prev = tb->currentline->prev;
        tlnew->next = tb->currentline;
        if(tb->currentline->prev)
            tb->currentline->prev->next = tlnew;
        else
            tb->firstline = tlnew;
        tb->currentline->prev = tlnew;
        tb->currentline = tlnew;
    } else {
        tlnew->prev = NULL;
        tlnew->next = NULL;
        tb->firstline = tlnew;
        tb->currentline = tlnew;
        tb->lastline = tlnew;
    }
    if(tlnew->prev)
        tlnew->prev->cont = NULL;
    tb_fix_line(tlnew);

    while(tlnew) {
        tlnew->flags |= TLINE_MODIFIED;
        tlnew = tlnew->next;
    }

    tb->n++;
    tb->bufchanged = TRUE;

    tb_handle_tabs(tb);
    tb_reformat(tb);
    return;
}               /* tb_insert_line() */

void tb_insert_block(TextBuf * tb, int r, int c, char *buf)
/*
 * Desc: insert the buffer <buf> into <tb> at the position (r,c)
 */ {
    TextLine *tl, *tlold;
    int i, len, oneline, oldwrap;
    char *newbuf, *p;

    /* store the current line */
    tlold = tb->currentline;

    /* no lines yet. insert as a new line(s) */
    if((tlold == NULL) && (r == 0)) {
        /* insert one line */
        if((p = strchr(buf, '\n')) == NULL)
            tb_insert_line(tb, buf);
        else {
            /* append multiple lines */
            do {
                tb_append_buf(tb, buf, p - buf);
                buf = ++p;
            } while((p = strchr(buf, '\n')) != NULL);
            tb_append_line(tb, buf);
        }

        tb->bufchanged = TRUE;
        return;
    }

    /* check if line <r> exists */
    if(tb_set_current_line(tb, r) == FALSE)
        return;

    /* check if position is valid */
    if((c > tb->currentline->strlen) || (c < 0))
        c = tb->currentline->strlen;

    tl = tb->currentline;
    tl->flags |= TLINE_MODIFIED;

    /* check if we inserting one-line buffer */
    if((p = strchr(buf, '\n')) == NULL) {
        len = strlen(buf);
        oneline = 1;
    } else {
        len = p - buf;
        oneline = 0;
    }

    /* check if the buffer can be fitted in string's buffer */
    if(tl->strlen + len >= tl->buflen) {
        /* reallocate the buffer space and add needed amount of space to it */
        newbuf = (char *) realloc(tl->buf, tl->buflen + len + 1);
        if(!newbuf) {
            tb_error
            ("tb_insert_buf(): Could not realloc, character not inserted");
            tb->currentline = tlold;
            return;
        }
        tl->buf = newbuf;

        newbuf = (char *) realloc(tl->attr, tl->buflen + len + 1);
        if(!newbuf) {
            tb_error
            ("tb_insert_buf(): Could not realloc attr, character not inserted");
            tb->currentline = tlold;
            return;
        }
        tl->attr = newbuf;

        tl->buflen = tl->buflen + len + 1;
    }
    /* store part of the string after <c> */
    newbuf = strdup(tl->buf + c);
    tl->buf[c] = '\0';
    /* add buf */
    strncat(tl->buf, buf, len);
    /* add remaining part of the string */
    strcat(tl->buf, newbuf);
    tl->strlen += len;
    free(newbuf);

    newbuf = strdup(tl->attr + c);
    tl->attr[c] = '\0';
    for(i = c; i < len + c; i++)
        tl->attr[i] = tb->attr_def;
    tl->attr[len + c] = '\0';
    strcat(tl->attr, newbuf);
    free(newbuf);

    tb_handle_tabs(tb);
    if(oneline) {
        /* wrap the line if needed */
        tb_reformat(tb);
        /* restore currentline */
        tb->currentline = tlold;
        tb->bufchanged = TRUE;
        return;
    }

    /* insert newline at the end of inserted text */
    tb_insert_cr(tb, c + len);
    /* start inserting new lines at the next line */
    tb_set_next_line(tb);

    /* temporary disable line/word wrapping */
    oldwrap = tb->linewrap;
    tb->linewrap = 0;

    /* insert multiple lines */
    buf = ++p;
    while((p = strchr(buf, '\n')) != NULL) {
        len = p - buf;
        newbuf = (char *) malloc(len + 1);
        strncpy(newbuf, buf, len);
        newbuf[len] = '\0';
        tb_insert_line(tb, newbuf);
        free(newbuf);
        tb_set_next_line(tb);
        buf = ++p;
    }

    /* the last line should be inserted at the beginning of the next one */
    tl = tb->currentline;
    tl->flags |= TLINE_MODIFIED;
    if(*buf && tl) {
        len = strlen(buf);
        /* check if the buffer can be fitted in string's buffer */
        if(tl->strlen + len >= tl->buflen) {
            /* reallocate the buffer space and add needed amount of space to it */
            newbuf = (char *) realloc(tl->buf, tl->buflen + len + 1);
            if(!newbuf) {
                tb_error
                ("tb_insert_buf(): Could not realloc, character not inserted");
                tb->currentline = tlold;
                return;
            }
            tl->buf = newbuf;

            newbuf = (char *) realloc(tl->attr, tl->buflen + len + 1);
            if(!newbuf) {
                tb_error
                ("tb_insert_buf(): Could not realloc attr, character not inserted");
                tb->currentline = tlold;
                return;
            }
            tl->attr = newbuf;

            tl->buflen = tl->buflen + len + 1;
        }
        tl->strlen += len;
        /* store part of the string after <c> */
        newbuf = strdup(tl->buf);
        /* add buf */
        strcpy(tl->buf, buf);
        /* add remaining part of the string */
        strcat(tl->buf, newbuf);
        free(newbuf);

        newbuf = strdup(tl->attr);
        for(i = 0; i < len; i++)
            tl->attr[i] = tb->attr_def;
        tl->attr[len] = '\0';
        strcat(tl->attr, newbuf);
        free(newbuf);

        tb_handle_tabs(tb);
    }

    /* restore wrap value */
    tb->linewrap = oldwrap;
    /* wrap the whole buffer if needed */
    tb_wrap_lines(tb);
    tb_reformat(tb);

    /* restore currentline */
    tb->currentline = tlold;
    tb->bufchanged = TRUE;

    return;
}               /* tb_insert() */

void tb_insert_rect(TextBuf * tb, int r, int c, int w, int h, char *buf)
/*
 * Desc: insert the block <buf> into <tb> at the position (r,c)
 * Pre:  <buf> has dimensions (w,h)
 */ {
    tb->bufchanged = TRUE;

    return;
}               /* tb_insert_rect() */

void tb_insert_cr(TextBuf * tb, int c)
/*
 * Desc: at position <c> in the current line insert a newline character
 *    and move the remainder of the line one line down.
 */ {
    char *newline;
    TextLine *tl;

    if(!tb->currentline) {
        /* we must have a virgin textbuffer!, just append two lines */
        tb_append_line(tb, "");
        tb_append_line(tb, "");
        return;
    }

    /* check to see if c is valid */
    if((c < 0) || (c > tb->currentline->strlen))
        return;

    if(c < tb->currentline->strlen) {
        /* get the line from the c-th position */
        newline = strdup(tb->currentline->buf + c);
        if(!newline) {
            tb_error
            ("tb_insert_newline(): Could not allocate space for newline");
            return;
        }
        tb->currentline->buf[c] = '\0';
        tb->currentline->strlen = c;
        tb->currentline->flags |= TLINE_MODIFIED;
        if(tb->currentline == tb->lastline)
            tb_append_line(tb, newline);
        else {
            /* insert a line at the next line */
            tb_set_next_line(tb);
            tb_insert_line(tb, newline);
            tb_set_prev_line(tb);
        }
        free(newline);

        newline = strdup(tb->currentline->attr + c);
        if(!newline) {
            tb_error
            ("tb_insert_newline(): Could not allocate space for newline attr");
            return;
        }
        tb->currentline->attr[c] = '\0';
        if(tb->currentline->next)
            strcpy(tb->currentline->next->attr, newline);
        free(newline);
    } else {
        /* we are at the end of the line, c == tb->currentline->strlen */
        if(tb->currentline == tb->lastline) {
            tb_append_line(tb, "");
        } else {
            tb_set_next_line(tb);
            tb_insert_line(tb, "");
            tb_set_prev_line(tb);
        }
    }

    tb->currentline->cont = NULL;
    tl = tb->currentline;
    while(tl) {
        tl->flags |= TLINE_MODIFIED;
        tl = tl->next;
    }

    return;
}               /* tb_insert_newline() */


/***********************************************************************
 *
 * Appending
 *
 ***********************************************************************/

void tb_append_line(TextBuf * tb, char *line)
/*
 * Desc: Append the <line> to <tb>
 */ {
    TextLine *tlnew, *tlcur;
    int i;

    /* allocate a new TextLine */
    tlnew = (TextLine *) malloc(sizeof(TextLine));
    if(!tlnew) {
        tb_error("tb_append_line(): Could not allocate TextLine");
        return;
    }
    /* Allocate the buffer in TextLine and copy the line into it */
    tlnew->buf = strdup(line ? line : "");
    if(!tlnew->buf) {
        tb_error("tb_append_line(): Could not allocate line buffer");
        free(tlnew);
        return;
    }

    tlnew->attr = strdup(line ? line : "");
    if(!tlnew->attr) {
        tb_error("tb_append_line(): Could not allocate line attr buffer");
        free(tlnew->buf);
        free(tlnew);
        return;
    }

    tlnew->strlen = strlen(tlnew->buf);
    for(i = 0; i < tlnew->strlen; i++)
        tlnew->attr[i] = tb->attr_def;

    tlnew->buflen = tlnew->strlen + 1;
    tlnew->bgcolor = tb->bgcolor_def;
    tlnew->fgcolor = tb->fgcolor_def;
    tlnew->cont = NULL;
    tlnew->flags = TLINE_MODIFIED;
    tlnew->clk_callback = NULL;
    tlnew->dbl_callback = NULL;
    tlnew->cur_callback = NULL;
    tlnew->callback_data = 0;
    tb_fix_line(tlnew);

    /* check if there are any lines at all yet */
    if(tb->lastline) {
        tlnew->next = NULL;
        tlnew->prev = tb->lastline;

        tb->lastline->next = tlnew;
        tb->lastline = tlnew;
    } else {
        tlnew->next = NULL;
        tlnew->prev = NULL;
        tb->firstline = tlnew;
        tb->currentline = tlnew;
        tb->lastline = tlnew;
    }
    tb->n++;
    tb->bufchanged = TRUE;

    if(tlnew->prev)
        tlnew->prev->cont = NULL;

    tlcur = tb->currentline;
    tb->currentline = tlnew;
    tb_handle_tabs(tb);
    tb_reformat(tb);
    tb->currentline = tlcur;

    return;
}               /* tb_append_line() */

void tb_append_buf(TextBuf * tb, char *buf, u_long len)
/*
 * Desc: Append the <buf> with length <len> to <tb>
 */ {
    TextLine *tlnew, *tlcur;
    int i;

    /* allocate a new TextLine */
    tlnew = (TextLine *) malloc(sizeof(TextLine));
    if(!tlnew) {
        tb_error("tb_append_buf(): Could not allocate TextLine");
        return;
    }
    /* Allocate the buffer in TextLine and copy the line into it */
    tlnew->buf = (char *) malloc(len + 1);
    if(!tlnew->buf) {
        tb_error("tb_append_buf(): Could not allocate line buffer");
        free(tlnew);
        return;
    }
    tlnew->attr = (char *) malloc(len + 1);
    if(!tlnew->attr) {
        tb_error("tb_append_buf(): Could not allocate line attr buffer");
        free(tlnew->buf);
        free(tlnew);
        return;
    }

    for(i = 0; i < len; i++)
        tlnew->attr[i] = tb->attr_def;

    strncpy(tlnew->buf, buf, len);
    tlnew->buf[len] = '\0';
    tlnew->attr[len] = '\0';
    tlnew->buflen = len + 1;
    tlnew->strlen = len;
    tlnew->bgcolor = tb->bgcolor_def;
    tlnew->fgcolor = tb->fgcolor_def;
    tlnew->cont = NULL;
    tlnew->flags = TLINE_MODIFIED;
    tlnew->clk_callback = NULL;
    tlnew->dbl_callback = NULL;
    tlnew->cur_callback = NULL;
    tlnew->callback_data = 0;
    tb_fix_line(tlnew);

    /* check if there are any lines at all yet */
    if(tb->lastline) {
        tlnew->next = NULL;
        tlnew->prev = tb->lastline;
        tb->lastline->next = tlnew;
        tb->lastline = tlnew;
    } else {
        tlnew->next = NULL;
        tlnew->prev = NULL;
        tb->firstline = tlnew;
        tb->currentline = tlnew;
        tb->lastline = tlnew;
    }
    tb->n++;
    tb->bufchanged = TRUE;

    if(tlnew->prev)
        tlnew->prev->cont = NULL;

    tlcur = tb->currentline;
    tb->currentline = tlnew;
    tb_handle_tabs(tb);
    tb_reformat(tb);
    tb->currentline = tlcur;

    return;
}               /* tb_append_buf() */

void tb_append_to_line(TextBuf * tb, char *line)
/*
 * Desc: Append the <line> to the current line
 */ {
    TextLine *tl, *tlcur;
    char *newbuf;
    int incr, i;

    if(!tb->currentline)
        return;

    tl = tb->currentline;
    tl->flags |= TLINE_MODIFIED;
    if(tl->strlen + strlen(line) + 1 >= tl->buflen) {
        /* reallocate the buffer space and add needed amount of space to it */
        incr =
        (strlen(line) + 1 >
         TB_BUFINC) ? (strlen(line) + 1) : TB_BUFINC;
        newbuf = (char *) realloc(tl->buf, tl->buflen + incr);
        if(!newbuf) {
            tb_error
            ("tb_append_to_line(): Could not realloc, buffer not appended");
            return;
        }
        tl->buf = newbuf;

        newbuf = (char *) realloc(tl->attr, tl->buflen + incr);
        if(!newbuf) {
            tb_error
            ("tb_append_to_line(): Could not realloc attr, buffer not appended");
            return;
        }
        tl->attr = newbuf;

        tl->buflen += incr;
    }

    for(i = tl->strlen; i < tl->strlen + strlen(line); i++)
        tl->attr[i] = '\0';

    strcat(tl->buf, line);
    tl->strlen = strlen(tl->buf);
    tl->attr[tl->strlen] = '\0';

    tlcur = tb->currentline;
    tb_fix_line(tl);
    tb_handle_tabs(tb);
    tb_reformat(tb);
    tb->currentline = tlcur;

    return;
}

int tb_wrap_line(TextBuf * tb)
/*
 * Desc: wrap current line if needed
 */ {
    char *p, *nextline, *nextattr, *newbuf, c;
    TextLine *tlwrap;
    int nlen, i, linewrap = tb->linewrap;

    tlwrap = tb->currentline;
    if(!tlwrap || (linewrap == 0)) {   /* is wrapping on? */
        if(tlwrap->strlen > tb->maxchars)
            tb->maxchars = tlwrap->strlen;
        return 0;
    }

    /* check if line should be wrapped */
    if(tlwrap->strlen <= abs(linewrap)) {
        if(tlwrap->strlen > tb->maxchars)
            tb->maxchars = tlwrap->strlen;
        return 0;
    }

    tlwrap->strlen = abs(linewrap);
    nextline = tlwrap->buf + tlwrap->strlen;

    if(linewrap < 0) {     /* word wrap */
        c = *nextline;
        *nextline = '\0';
        if((p = strrchr(tlwrap->buf, ' ')) != NULL) {
            *nextline = c;
            tlwrap->strlen = p - tlwrap->buf;
            nextline = ++p;
        } else {
            /* can not word wrap - wrap as usual */
            *nextline = c;
            linewrap = abs(linewrap);
        }
    }
    nlen = strlen(nextline);
    nextattr = tlwrap->attr + tlwrap->strlen;

    /* if the line was already wrapped then add the rest */
    /* at the beginning of the next line */
    if(tlwrap->cont && (tlwrap->cont == tlwrap->next)) {
        /* if it's a word wrapping don't forget about the extra space */
        if(linewrap < 0)
            nlen++;
        tlwrap->flags |= TLINE_MODIFIED;
        /* check if the nextline can be fitted in the buffer */
        if(tlwrap->next->strlen + nlen >= tlwrap->next->buflen) {
            /* reallocate the buffer space and add a fixed amount of space
               to it */
            newbuf =
            (char *) realloc(tlwrap->next->buf,
                             tlwrap->next->buflen + nlen + 1);
            if(!newbuf) {
                tb_error
                ("tb_wrap_line(): Could not realloc, character not inserted");
                return 0;
            }
            tlwrap->next->buf = newbuf;
            newbuf =
            (char *) realloc(tlwrap->next->attr,
                             tlwrap->next->buflen + nlen + 1);
            if(!newbuf) {
                tb_error
                ("tb_wrap_line(): Could not realloc attr, character not inserted");
                return 0;
            }
            tlwrap->next->attr = newbuf;

            tlwrap->next->buflen = tlwrap->next->buflen + nlen + 1;
        }

        /* shift the line <nlen> places right */
        for(i = tlwrap->next->strlen; i >= 0; i--) {
            tlwrap->next->buf[i + nlen] = tlwrap->next->buf[i];
            tlwrap->next->attr[i + nlen] = tlwrap->next->attr[i];
        }
        /* insert the newline */
        for(i = 0; i < nlen; i++) {
            tlwrap->next->buf[i] = nextline[i];
            tlwrap->next->attr[i] = nextattr[i];
        }
        /* add extra space */
        if(linewrap < 0)
            tlwrap->next->buf[nlen - 1] = ' ';
        /* adjust the string length */
        tlwrap->next->strlen += nlen;
    } else {
        /* otherwise add the rest of the line as a new line */
        if(tb->currentline == tb->lastline) {
            /* append a line */
            tb_append_line(tb, nextline);
        } else {
            /* insert a line at the next line */
            tb_set_next_line(tb);
            tb_insert_line(tb, nextline);
            tb_set_prev_line(tb);
        }
        /* mark that the new line is a continuation of the current line */
        tlwrap->cont = tlwrap->next;

        /* new line has the same colors as current */
        tlwrap->next->bgcolor = tlwrap->bgcolor;
        tlwrap->next->fgcolor = tlwrap->fgcolor;
    }

    /* terminate the wrapped line */
    tlwrap->buf[tlwrap->strlen] = '\0';
    tlwrap->attr[tlwrap->strlen] = '\0';

    if(tlwrap->strlen > tb->maxchars)
        tb->maxchars = tlwrap->strlen;
    while(tlwrap) {
        tlwrap->flags |= TLINE_MODIFIED;
        tlwrap = tlwrap->next;
    }

    /* check if new (next) line also needs wrapping */
    tb_set_next_line(tb);
    tb_wrap_line(tb);
    tb_set_prev_line(tb);

    return 1;
}               /* tb_wrap_line() */

int tb_reformat(TextBuf * tb) {
    static int formatting;
    int i, pstart, pend;


    /* reformat paragraph if needed */
    if((i = tb_wrap_line(tb)) == 1) {
        if(tb->flags & TEXT_AUTOFORMAT) {
            if(formatting)
                return i;
            formatting = 1;
            tb_get_paragraph(tb, &pstart, &pend);
            tb_fill_region(tb, tb->i, 0, pend, -1);
            formatting = 0;
        }
    }

    return i;
}

void tb_wrap_lines(TextBuf * tb)
/*
 * Desc: wrap all lines in buffer
 */ {
    if(tb_get_nlines(tb) > 0) {
        tb_set_current_line(tb, 0);
        tb_wrap_line(tb);
        while(tb_set_next_line(tb))
            tb_wrap_line(tb);
    }
}

void tb_fill_region(TextBuf * tb, int r0, int c0, int r1, int c1)
/*
 * Desc: fill specified region with text
 */ {
    char *buf, *p;

    /* only meaningfull if word wrap is set */
    if(tb->linewrap >= 0)
        return;

    /* get the text */
    tb_get_block(tb, r0, c0, r1, c1, &buf);
    if(buf == NULL)
        return;

    /* don't process empty lines */
    if(strlen(buf) <= 1) {
        free(buf);
        return;
    }

    /* remove all CRs except the last one */
    p = buf;
    while((p = strchr(p, '\n')) != NULL) {
        if(*(p + 1) != '\0')
            *p = ' ';
        else
            break;
    }

    /* nothing to wrap here */
    if(!strchr(buf, ' ')) {
        free(buf);
        return;
    }

    /* delete block */
    if(tb_del_block(tb, r0, c0, r1, c1) == FALSE) {
        free(buf);
        return;
    }

    if((tb_set_current_line(tb, r0) == FALSE) && (r0 > 0)) {
        tb_set_current_line(tb, r0 - 1);
        tb_append_line(tb, buf);
    } else
        tb_insert_block(tb, r0, c0, buf);

    free(buf);

    return;
}

void tb_get_paragraph(TextBuf * tb, int *pstart, int *pend)
/*
 * Desc: returns start/end lines number of paragraph around current line
 */ {
    TextLine *tl;
    int i;

    tl = tb->currentline;
    i = tb->i;

    if(tl->strlen == 0) {
        *pstart = *pend = i;
        return;
    }

    while(tl->prev && (tl->prev->strlen > 0) && (i > 0)) {
        i--;
        tl = tl->prev;
    }

    *pstart = i;

    tl = tb->currentline;
    i = tb->i;

    while(tl->next && (tl->next->strlen > 0)) {
        i++;
        tl = tl->next;
    }

    *pend = i;

    return;
}

void tb_modify_lines(TextBuf * tb)
/*
 * Desc: mark all lines below current as modified
 */ {
    TextLine *tl;

    tl = tb->currentline;
    while(tl) {
        tl->flags |= TLINE_MODIFIED;
        tl = tl->next;
    }
}

/***********************************************************************
 *
 * Deletion
 *
 ***********************************************************************/

int tb_del_char(TextBuf * tb, int n)
/*
 * Desc: delete the character at the n-th position, returns TRUE
 *    when the screen needs redrawing
 */ {
    int i, l;
    char *line, *newbuf;
    char *nline, *nattr;
    TextLine *tl;

    if(n > tb_get_linelen(tb))
        return(FALSE);

    /* get the current line */
    tb_get_line(tb, &line);
    if(!line)
        return(FALSE);

    tb->bufchanged = TRUE;
    if(n == tb_get_linelen(tb)) {
        /* we are at eol, join the current line with the next one */
        if(tb_set_next_line(tb)) {
            tb_get_line(tb, &nline);
            nattr = tb->currentline->attr;
            tb_set_prev_line(tb);
        } else
            return FALSE;

        l = strlen(nline);
        tl = tb->currentline;
        tl->flags |= TLINE_MODIFIED;

        /* check if the next line can be fitted in the buffer */
        if(tl->strlen + l >= tl->buflen) {
            /* reallocate the buffer space and add a fixed amount of space
               to it */
            l = tl->strlen + l + TB_BUFINC;
            newbuf = (char *) realloc(tl->buf, l);
            if(!newbuf) {
                tb_error
                ("tb_del_char(): Could not realloc, character not deleted");
                return(FALSE);
            }
            tl->buf = newbuf;

            newbuf = (char *) realloc(tl->attr, l);
            if(!newbuf) {
                tb_error
                ("tb_del_char(): Could not realloc attr, character not deleted");
                return(FALSE);
            }
            tl->attr = newbuf;
            tl->buflen = l;
        }
        strcat(tl->buf, nline);
        strcat(tl->attr, nattr);
        tl->strlen = strlen(tl->buf);

        /* delete the next line */
        tb_set_next_line(tb);
        tb_del_line(tb);

        /* restore the current line */

        tb->currentline = tl;
        /* check if current line needs wrapping */
        tb_reformat(tb);

        return(TRUE);
    }

    /* check if the line has any characters in it */
    if(tb->currentline->strlen > 0) {
        tb->currentline->flags |= TLINE_MODIFIED;
        for(i = n; i < tb->currentline->strlen; i++) {
            tb->currentline->buf[i] = tb->currentline->buf[i + 1];
            tb->currentline->attr[i] = tb->currentline->attr[i + 1];
        }
        /* adjust strlen */
        tb->currentline->strlen--;
    }

    return(FALSE);
}               /* tb_del_char() */

void tb_del_line(TextBuf * tb)
/*
 * Desc: delete the current line
 */ {
    TextLine *tl = tb->currentline;

    if(!tl) {
        /* no lines to remove */
        return;
    }

    tb->bufchanged = TRUE;
    /* check if we are in the middle or the first line of the text */
    if(tl->prev) {
        tl->prev->next = tl->next;
        /* if there is a next line make that the current one, otherwise
           the previous one */
        if(tl->next) {
            tl->next->prev = tl->prev;
            tb->currentline = tl->next;
            /* tb->i stays the same */
        } else {
            /* the current line is the last one in the buffer */
            tb->currentline = tl->prev;
            if(tb->i > 0)
                tb->i--;
            /* adjust the last line, we are about to delete it! */
            tb->lastline = tl->prev;
        }
    } else {
        /* we are at the first line */
        /* see also above */
        if(tl->next) {
            tl->next->prev = NULL;
            tb->currentline = tl->next;
            /* adjust the first line, we are about to delete it */
            tb->firstline = tl->next;
            /* tb->i stays the same */
        } else {
            /* this must the only line in the buffer */
            tb->firstline = NULL;
            tb->currentline = NULL;
            tb->lastline = NULL;
            if(tb->i > 0)
                tb->i--;
        }
    }
    free(tl->buf);
    free(tl->attr);
    free(tl);

    tl = tb->currentline;
    while(tl) {
        tl->flags |= TLINE_MODIFIED;
        tl = tl->next;
    }

    tb->n--;

    return;
}               /* tb_del_line() */

int tb_del_block(TextBuf * tb, int r0, int c0, int r1, int c1)
/*
 * Desc: delete the block at the specified coordinates
 */ {
    int i, k, rtop, rbottom, sellen;

    if(r0 > r1) {
        rtop = r0;
        rbottom = 1;
    } else {
        rtop = r1;
        rbottom = r0;
    }

    tb->bufchanged = TRUE;

    if(rtop == rbottom) {
        tb_set_current_line(tb, rtop);
        if(!tb->currentline)
            return FALSE;

        if(c1 < 0)
            c1 = tb->currentline->strlen;
        if(c0 < 0)
            c0 = 0;
        if(c0 > c1) {
            i = c1;
            c1 = c0;
            c0 = i;
        }
        if(c1 == c0)
            return TRUE;

        if((c0 == 0) && (c1 >= tb->currentline->strlen)) {
            tb_del_line(tb);
            return TRUE;
        }

        sellen = c1 - c0;
        for(i = c1; i <= tb->currentline->strlen; i++) {
            tb->currentline->buf[i - sellen] = tb->currentline->buf[i];
            tb->currentline->attr[i - sellen] = tb->currentline->attr[i];
        }

        tb->currentline->strlen -= sellen;
        tb->currentline->flags |= TLINE_MODIFIED;
        return TRUE;
    }

    for(i = rbottom; i <= rtop; i++) {
        tb_set_current_line(tb, i);
        if(!tb->currentline)
            continue;

        if(i == rtop) {
            if((c1 < 0) || (c1 >= tb->currentline->strlen)) {
                tb_del_line(tb);
                i--;
                rtop--;
                if(rtop < rbottom)
                    break;
            } else {
                for(k = c1; k <= tb->currentline->strlen; k++) {
                    tb->currentline->buf[k - c1] = tb->currentline->buf[k];
                    tb->currentline->attr[k - c1] =
                    tb->currentline->attr[k];
                }
                tb->currentline->strlen -= c1;
                tb->currentline->flags |= TLINE_MODIFIED;
            }
        } else if(i == rbottom) {
            if(c0 == 0) {
                tb_del_line(tb);
                i--;
                rtop--;
                if(rtop < rbottom)
                    break;
            } else {
                tb->currentline->buf[c0] = '\0';
                tb->currentline->attr[c0] = '\0';
                tb->currentline->strlen = c0;
                tb->currentline->flags |= TLINE_MODIFIED;
            }
        } else {
            tb_del_line(tb);
            i--;
            rtop--;
            if(rtop < rbottom)
                break;
        }
    }

    return TRUE;
}               /* tb_del_block() */

int tb_handle_tabs(TextBuf * tb)
/*
 * Desc: replace TABs with SPACEs in the current line according to <tablen>
 * returns number of SPACES that was inserted
 */ {
    TextLine *tl = tb->currentline;
    char *p, *p1, *newbuf;
    int pos, spaces, i, moved;

    if(!tl)
        return 0;

    moved = 0;
    /* scan line for TABs */
    p = tl->buf;
    while((p1 = strchr(p, '\t')) != NULL) {
        /* calculate TAB position */
        pos = p1 - tl->buf;
        /* calculate number of SPACEs to insert */
        if(tb->tablen > pos)
            spaces = tb->tablen - pos;
        else
            spaces = tb->tablen - (pos % tb->tablen);
        moved += spaces;    /* record how much spaces we added */
        spaces--;
        /* if only one SPACE then replace TAB with it and go on */
        if(spaces == 0) {
            *p1 = ' ';
            p1++;
            p = p1;
            continue;
        }
        /* check if the spaces can be fitted in the buffer */
        if(tl->strlen + spaces >= tl->buflen) {
            /* reallocate the buffer space and add a fixed amount of space
               to it */
            newbuf = (char *) realloc(tl->buf, tl->buflen + TB_BUFINC);
            if(!newbuf) {
                tb_error
                ("tb_insert_char(): Could not realloc, spaces not inserted");
                return moved;
            }
            tl->buf = newbuf;

            newbuf = (char *) realloc(tl->attr, tl->buflen + TB_BUFINC);
            if(!newbuf) {
                tb_error
                ("tb_insert_char(): Could not realloc attr, spaces not inserted");
                return moved;
            }
            tl->attr = newbuf;

            tl->buflen = tl->buflen + TB_BUFINC;
        }
        /* tl->strlen+spaces < tl->buflen !!! */

        /* first move the characters after pos spaces position */
        for(i = tl->strlen; i > pos; i--) {
            tl->buf[i + spaces] = tl->buf[i];
            tl->attr[i + spaces] = tl->attr[i];
        }
        /* insert spaces */
        for(i = pos; i <= pos + spaces; i++) {
            tl->buf[i] = ' ';
            tl->attr[i] = tb->attr_def;
        }
        /* adjust strlen */
        tl->strlen += spaces;
        /* continue the search */
        p = tl->buf + pos + 1;
    }

    if(moved)
        tl->flags |= TLINE_MODIFIED;

    return moved;
}

/***********************************************************************
 *
 * Memory buffer
 *
 ***********************************************************************/

void tb_set_text(TextBuf * tb, char *buf, long len)
/*
 * Desc: the text from <buf> is loaded into <tb>. The current buffer
 *  is cleared
 *  <len> is the length of <buf>. If it's negative <buf> is assumed
 *  to be NULL terminated.
 */ {
    char *t;
    long buflen;

    /* clear the current buffer */
    tb_clear(tb);
    tb->bufchanged = FALSE;
    if(!buf || (len == 0))
        return;

    if(len < 0)
        len = strlen(buf);

    /* scan buffer for newlines */
    /* Note: buf can not be modified! */
    while((t = (char *) memchr((void *) buf, '\n', len)) != NULL) {
        buflen = ++t - buf;
        len -= buflen;
        buflen--;
        if(buflen && (buf[buflen - 1] == '\r'))
            buflen--;
        tb_append_buf(tb, buf, buflen);
        tb_handle_tabs(tb);
        tb->currentline = tb->lastline;
        tb_set_next_line(tb);
        buf = t;
    }

    if(len > 0)
        tb_append_buf(tb, buf, len);

    return;
}

u_long tb_get_textlen(TextBuf * tb)
/*
 * Desc: calculate length of text in buffer
 */ {
    u_long buflen = 0;
    TextLine *tl = tb->firstline;

    while(tl) {
        buflen += tl->strlen;
        tl = tl->next;
        if(tl)
            buflen++;
    }

    return buflen;
}

char *tb_get_text(TextBuf * tb, u_long * len)
/*
 * Desc: put text from <tb> in newly allocated buffer.
 * returned buffer should be freed.
 * returns pointer to buffer. buffer length is returned in len.
 */ {
    char *line, *buf, *p;
    u_long *buflen, mlen;
    TextLine *tl;
    int i;

    /* save the current line */
    i = tb->i;
    tl = tb->currentline;

    if(len == NULL)
        buflen = &mlen;
    else
        buflen = len;

    /* first caclulate the buffer length */
    *buflen = 0;
    tb_set_current_line(tb, 0);
    do {
        tb_get_line(tb, &line);
        if(!line)
            break;
        *buflen += (strlen(line) + 1);
    } while(tb_set_next_line(tb));

    /* allocate the buffer */
    if((buf = (char *) malloc(*buflen + 1)) == NULL) {
        tb_error("Can not allocate text buffer");
        tb->i = i;
        tb->currentline = tl;
        return NULL;
    }

    /* insert text into the buffer */
    p = buf;
    *p = '\0';
    tb_set_current_line(tb, 0);
    do {
        tb_get_line(tb, &line);
        if(!line)
            break;
        strcpy(p, line);
        p += strlen(line);
        *p = '\n';
        p++;
        *p = '\0';
    } while(tb_set_next_line(tb));
    tb->bufchanged = FALSE;

    /* remove last CR
       if (*buflen > 0)    {
       (*buflen)--;
       buf[*buflen] = '\0';
       }
     */

    /* restore the current line */
    tb->i = i;
    tb->currentline = tl;

    return buf;
}

/***********************************************************************
 *
 * File I/O
 *
 ***********************************************************************/

void tb_load_file(TextBuf * tb, char *fname)
/*
 * Desc: the file <fname> is loaded into <tb>. The current buffer
 *   is cleared.
 * Note: This routine can be highly optimized, aswell as tb_append_line()
 */ {
    FILE *f;
    char line[8192];        /* this limits the loadable line length to 8192 */

    f = fopen(fname, "r");
    if(!f) {
        tb_error("Could not read file %s", fname);
        return;
    }

    /* clear the current buffer */
    tb_clear(tb);
    while(fgets(line, 8192, f)) {
        tb_append_line(tb, line);
        tb_handle_tabs(tb);
        /* change tabs to spaces */
        tb->currentline = tb->lastline;

        tb_set_next_line(tb);
    }
    fclose(f);
    tb->bufchanged = FALSE;

    return;
}               /* tb_load_file() */

void tb_insert_file(TextBuf * tb, int r, int c, char *fname)
/*
 * Desc: insert file <fname> starting from (r,c) position
 */ {
    FILE *f;
    char line[8192];        /* this limits the loadable line length to 8192 */
    TextLine *tl, *tlold;
    int len, oldwrap;

    /* store the current line */
    tlold = tb->currentline;

    /* no lines yet. insert as a new line(s) */
    if((tlold == NULL) && (r == 0)) {
        tb_load_file(tb, fname);
        return;
    }

    /* check if line <r> exists */
    if(tb_set_current_line(tb, r) == FALSE)
        return;

    /* check if position is valid */
    if(c > tb->currentline->strlen) {
        tb->currentline = tlold;
        return;
    }

    tl = tb->currentline;

    f = fopen(fname, "r");
    if(!f) {
        tb_error("Could not read file %s", fname);
        return;
    }

    /*read the first line */
    if(!fgets(line, 8191, f)) {
        fclose(f);
        return;
    }

    /* make sure that line ends with CR */
    len = strlen(line);
    if(line[len - 1] != '\n') {
        line[len] = '\n';
        line[len + 1] = '\0';
    }

    /* temporary disable wrapping */
    oldwrap = tb->linewrap;
    tb->linewrap = 0;

    /* insert it as a block */
    tb_insert_block(tb, r, c, line);
    tb_set_next_line(tb);

    while(fgets(line, 8191, f)) {
        /* insert each line */
        tb_insert_line(tb, line);
        tb_set_next_line(tb);
    }

    fclose(f);

    /* rewrap everything */
    tb->linewrap = oldwrap;
    tb_wrap_lines(tb);

    tb->currentline = tlold;

    return;
}

void tb_save_file(TextBuf * tb, char *fname)
/*
 * Desc: save the current buffer <tb> to the file <fname>
 */ {
    FILE *f;
    char *line;

    f = fopen(fname, "w");
    if(!f) {
        tb_error("Could not save to file %s", fname);
        return;
    }

    tb_set_current_line(tb, 0);
    do {
        tb_get_line(tb, &line);
        if(!line)
            break;
        fprintf(f, "%s\n", line);
    } while(tb_set_next_line(tb));
    fclose(f);
    tb->bufchanged = FALSE;

    return;
}               /* tb_save_file() */

/***********************************************************************
 *
 * Miscellaneous
 *
 ***********************************************************************/

int tb_set_current_line(TextBuf * tb, int n)
/*
 * Desc: Set the current line to the n-th line
 * n == -1 - lastline n == 0 - firstline
 */ {
    int i;
    TextLine *tl;

    i = 0;
    tl = tb->firstline;

    if(n == -1) {
        while(tl && (tl != tb->lastline)) {
            tl = tl->next;
            i++;
        }

        if(tl) {
            tb->currentline = tl;
            tb->i = i;
            return TRUE;
        }

        return FALSE;
    }

    while(tl && i < n) {
        tl = tl->next;
        i++;
    }

    if(tl && i == n) {
        /* we've got the right linenr */
        tb->currentline = tl;
        tb->i = n;
        return TRUE;
    } else          /* the linenr does not exist */
        return FALSE;

}               /* tb_set_line() */

int tb_set_next_line(TextBuf * tb)
/*
 * Desc: set the current line to the next one in the buffer,
 *   return FALSE if at EOF, else TRUE
 */ {
    if(tb->currentline->next) {
        tb->currentline = tb->currentline->next;
        tb->i++;
        return(TRUE);
    } else {
        return(FALSE);
    }
}               /* tb_set_next_line() */

int tb_set_prev_line(TextBuf * tb)
/*
 * Desc: set the current line to the previous one in the buffer
 *   return FALSE if at BOF, else TRUE
 */ {
    if(tb->currentline->prev) {
        tb->currentline = tb->currentline->prev;
        tb->i--;
        return(TRUE);
    } else {
        return(FALSE);
    }
}               /* tb_set_prev_line() */

int tb_get_nlines(TextBuf * tb)
/*
 * Desc: return the # of lines in <tb>
 */ {
    return(tb->n);
}               /* tb_get_nlines() */

int tb_get_current_line_nr(TextBuf * tb)
/*
 * Desc: return the index of the current line
 */ {
    return(tb->i);
}               /* tb_get_current_line_nr() */

int tb_get_linelen(TextBuf * tb)
/*
 * Desc: return the lenght of the current line
 */ {
    if(tb->currentline)
        return tb->currentline->strlen;
    else
        return(0);
}               /* tb_get_linelen() */

void tb_set_linelen(TextBuf * tb, int len)
/*
 * Desc: set lenght of current line (cut the line)
 */ {
    if(!tb->currentline)
        return;

    if(len < tb->currentline->strlen) {
        tb->bufchanged = TRUE;
        tb->currentline->flags |= TLINE_MODIFIED;
        tb->currentline->strlen = len;
        tb->currentline->attr[len] = '\0';
        tb->currentline->buf[len] = '\0';
    }
}

void tb_set_linewrap(TextBuf * tb, int wrap)
/*
 * Desc: set line (word) wrap length
 */ {
    tb->linewrap = wrap;
}

int tb_get_linewrap(TextBuf * tb)
/*
 * Desc: get line (word) wrap length
 */ {
    return tb->linewrap;
}

void tb_set_linefgcolor(TextBuf * tb, int c)
/*
 * Desc: set the current line color
 */ {
    TextLine *tl;

    tl = tb->currentline;
    tl->fgcolor = c;

    while(tl->cont && (tl->next == tl->cont)) {
        tl = tl->cont;
        tl->fgcolor = c;
    }

    tl = tb->currentline;
    while(tl->prev && (tl->prev->cont == tl)) {
        tl = tl->prev;
        tl->fgcolor = c;
    }

    return;
}               /* tb_set_linefgcolor() */

void tb_set_linebgcolor(TextBuf * tb, int c)
/*
 * Desc: set the current bg line color
 */ {
    TextLine *tl;

    tl = tb->currentline;
    tl->bgcolor = c;

    while(tl->cont && (tl->next == tl->cont)) {
        tl = tl->cont;
        tl->bgcolor = c;
    }

    tl = tb->currentline;
    while(tl->prev && (tl->prev->cont == tl)) {
        tl = tl->prev;
        tl->bgcolor = c;
    }

    return;
}               /* tb_set_linebgcolor() */

int tb_get_linefgcolor(TextBuf * tb)
/*
 * Desc: return the fg color for the current line
 */ {
    return(tb->currentline->fgcolor);
}               /* tb_get_linefgcolor() */

int tb_get_linebgcolor(TextBuf * tb)
/*
 * Desc: return the bg color for the current line
 */ {
    return(tb->currentline->bgcolor);
}               /* tb_get_linebgcolor() */

int tb_bufchanged(TextBuf * tb)
/*
 * Desc: return the status of the textbuffer
 */ {
    return(tb->bufchanged);
}               /* tb_bufchanged() */

void tb_set_bufchanged(TextBuf * tb, int status)
/*
 * Desc: set the bufferchanged status
 */ {
    tb->bufchanged = status;
    return;
}               /* tb_set_bufchanged() */

int tb_find_text(TextBuf * tb, char *text, int sline, int spos, int *pos)
/*
 * Desc: search for <text> in <tb> starting from line <sline>:<spos>
 * Ret: line number of line that contains the text or -1 if text not found
 *      <pos> returns the position of the text in the line
 */ {
    TextLine *tl;
    int line;
    char *p, *str;

    tl = tb->firstline;
    line = 0;
    while(tl) {
        if(line < sline) {
            tl = tl->next;
            line++;
            continue;
        }

        if(sline == line)
            str = tl->buf + spos;
        else
            str = tl->buf;

        if((p = strstr(str, text)) != NULL) {
            if(pos)
                *pos = p - tl->buf;
            return line;
        }

        tl = tl->next;
        line++;
    }

    return -1;
}

void tb_fix_line(TextLine * tl)
/*
 * Take care of all CR and LF characters in the string
 */ {
    char *p;
    unsigned char c;

    p = tl->buf;

    while(*p != '\0') {
        c = *(unsigned char *) p;
        switch(c) {
            case '\010':
            case 0xa0:
                *p = '_';
                break;

            case '\n':
                if(p[1] == '\0') {
                    *p = '\0';
                    tl->strlen = strlen(tl->buf);
                    tl->attr[tl->strlen] = '\0';
                    return;
                }
                *p = '_';
                break;

            case '\r':
                if((p[1] == '\n') && (p[2] == '\0')) {
                    *p = '\0';
                    tl->strlen = strlen(tl->buf);
                    tl->attr[tl->strlen] = '\0';
                    return;
                }
                *p = '_';
                break;
        }
        p++;
    }

    tl->attr[tl->strlen] = '\0';

    return;
}

int tb_set_flags(TextBuf * tb, int flags)
/*
 * Desc: Returns flags value for given textbuf.
 * Ret: old flags value. If supplied flags value is -1 then it's not set
 */ {
    int oflags = tb->flags;

    if(flags >= 0)
        tb->flags = flags;

    return oflags;
}

textline_callback
tb_set_callback(TextBuf * tb, textline_callback callback, int cbtype,
                int data)
/*
 * Desc: set callback on current line
 * Ret: old callback value
 */ {
    textline_callback ocb = NULL;
    TextLine *tl;

    if(tb->currentline == NULL)
        return NULL;

    tb->currentline->callback_data = data;

    switch(cbtype) {
        case FL_TEXTLINE_CLK_CALLBACK:
            ocb = tb->currentline->clk_callback;
            tb->currentline->clk_callback = callback;
            break;

        case FL_TEXTLINE_DBL_CALLBACK:
            ocb = tb->currentline->dbl_callback;
            tb->currentline->dbl_callback = callback;
            break;

        case FL_TEXTLINE_CUR_CALLBACK:
            ocb = tb->currentline->cur_callback;
            tb->currentline->cur_callback = callback;
            break;

        default:
            return NULL;
            break;
    }

    tl = tb->currentline;
    while(tl->cont && (tl->next == tl->cont)) {
        tl = tl->cont;
        switch(cbtype) {
            case FL_TEXTLINE_CLK_CALLBACK:
                tl->clk_callback = callback;
                break;

            case FL_TEXTLINE_DBL_CALLBACK:
                tl->dbl_callback = callback;
                break;

            case FL_TEXTLINE_CUR_CALLBACK:
                tl->cur_callback = callback;
                break;
        }
    }

    tl = tb->currentline;
    while(tl->prev && (tl->prev->cont == tl)) {
        tl = tl->prev;
        switch(cbtype) {
            case FL_TEXTLINE_CLK_CALLBACK:
                tl->clk_callback = callback;
                break;

            case FL_TEXTLINE_DBL_CALLBACK:
                tl->dbl_callback = callback;
                break;

            case FL_TEXTLINE_CUR_CALLBACK:
                tl->cur_callback = callback;
                break;
        }
    }

    return ocb;
}