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/*
* Functions for drawing String's with tab characters in them
*/
#include <stdlib.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include "tabstr.h"
/*
* Like DrawImageString, except it takes an additional "tabs"
* argument, used to specify what horizontal pixel position to
* move to when tab characters are present in the string. If
* the "tabs" argument is NULL, works exactly like its
* counterpart.
*/
void
XfwfDrawImageString(display, drawable, gc, font, x, y, string, length, tabs, underline)
Display *display;
Drawable drawable;
GC gc;
XFontStruct *font;
int x;
int y;
String string;
int length;
int *tabs;
char *underline;
{
register char *p, *ep;
register int tx, tab;
tab = tx = 0;
for (p = string; length; ) {
ep = strnchr(p, '\t', length);
if (underline && p <= underline && underline < ((ep && tabs) ? ep : p+length)) {
int _x = 0, _wd = 0;
if (p != underline) {
int direction, ascent, descent; XCharStruct overall;
XTextExtents(font, p, underline - p, &direction, &ascent, &descent, &overall);
_x = overall.width;
}
_wd = XTextWidth(font, underline, 1);
XDrawLine(display, drawable, gc,
x+tx + _x , y + font->max_bounds.descent - 1,
x+tx + _x + _wd, y + font->max_bounds.descent - 1);
}
if (ep && tabs) {
XDrawImageString(display, drawable, gc, x+tx, y, p, ep - p);
tx = tabs[tab++];
length -= ep - p + 1;
p = ep + 1;
} else {
XDrawImageString(display, drawable, gc, x+tx, y, p, length);
break;
}
}
}
/*
* Like DrawString, except it takes an additional "tabs"
* argument, used to specify what horizontal pixel position to
* move to when tab characters are present in the string. If
* the "tabs" argument is NULL, works exactly like its
* counterpart.
*/
void XfwfDrawString(display, drawable, gc, font, x, y, string, length, tabs, underline)
Display *display;
Drawable drawable;
GC gc;
XFontStruct *font;
int x;
int y;
String string;
int length;
int *tabs;
char *underline;
{
register char *p, *ep;
register int tx, tab;
tab = tx = 0;
for (p = string; length; ) {
ep = strnchr(p, '\t', length);
if (underline && p <= underline && underline < ((ep && tabs) ? ep : p+length)) {
int _x = 0, _wd = 0;
if (p != underline) {
int direction, ascent, descent; XCharStruct overall;
XTextExtents(font, p, underline - p, &direction, &ascent, &descent, &overall);
_x = overall.width;
}
_wd = XTextWidth(font, underline, 1);
XDrawLine(display, drawable, gc,
x+tx + _x , y + font->max_bounds.descent - 1,
x+tx + _x + _wd, y + font->max_bounds.descent - 1);
}
if (ep && tabs) {
XDrawString(display, drawable, gc, x+tx, y, p, ep - p);
tx = tabs[tab++];
length -= ep - p + 1;
p = ep + 1;
} else {
XDrawString(display, drawable, gc, x+tx, y, p, length);
break;
}
}
}
/*
* Converts a string list of tabs to an array of tabs
*/
int *XfwfTablist2Tabs(tablist)
char *tablist;
{
register int *tabs = NULL;
register int ntabs = 0;
if (!tablist)
return NULL;
for (;;)
{
/* Skip leading blanks */
while (*tablist && *tablist == ' ') ++tablist;
if (!*tablist) break;
/* Allocate space for the new tab */
if (ntabs)
tabs = (int *) XtRealloc( (char *) tabs,
(ntabs+1) * sizeof(int));
else
tabs = (int *) XtMalloc( (ntabs + 1) * sizeof(int));
/* Add it to the list */
tabs[ntabs++] = atoi(tablist);
/* Skip to the next blank */
while (*tablist && *tablist != ' ') ++tablist;
}
return (tabs);
}
/*
* Like TextWidth, except it takes an additional "tabs"
* argument, used to specify what horizontal pixel position to
* move to when tab characters are present in the string. If
* the "tabs" argument is NULL, works exactly like its
* counterpart.
*/
int
XfwfTextWidth(font, str, length, tabs)
XFontStruct *font;
String str;
int length;
int *tabs;
{
register char *p, *ep;
register int tx, tab, rc;
tab = tx = 0;
if (length == 0) return 0;
for (p = str; length; )
{
ep = strnchr(p, '\t', length);
if (ep && tabs)
{
tx = tabs[tab++];
length -= ep - p + 1;
p = ep + 1;
}
else
{
rc = XTextWidth(font, p, length);
if (rc < 0) return rc; else return rc + tx;
}
}
return -1;
}
/*
* Like strchr, except has a length limit.
*/
char *
strnchr(s, c, n)
char *s;
int c;
int n;
{
while (n--)
if (*s == c) return s; else ++s;
return NULL;
}
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