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[Bugfix] splash adjust string split logic, tab justify

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only split a long word across lines if it is larger than screen width
also consider \0 as a valid place to split so we still run through the space finding loop

make /t left justify the splash window (in RTL langs it right justifies)

Change-Id: Id2955878a178c66cb0a1c644e62f943247666d8b
This commit is contained in:
William Wilgus 2026-05-16 10:05:46 -04:00
parent 1beafb9290
commit 21fe45caad
1 changed files with 22 additions and 19 deletions
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41
apps/gui/splash.c
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@ -83,6 +83,7 @@ static bool splash_internal(struct screen * screen, const char *fmt, va_list ap,
char *buf = splash_buf;
const char *next, *store;
bool has_tabs = false;
int line = 0;
int x = 0, w = 0;
int y;
@ -100,25 +101,32 @@ static bool splash_internal(struct screen * screen, const char *fmt, va_list ap,
font_getstringsize(" ", &space_w, &chr_h, fontnum);
y = (addl_lines * chr_h);
int res = vsnprintf(splash_buf, sizeof(splash_buf), fmt, ap); /*-1 to prevent sanitizer issues */
int res = vsnprintf(splash_buf, sizeof(splash_buf), fmt, ap);
va_end(ap);
if (res <= 0)
{
#ifdef SIMULATOR
printf("ERR\n");
printf("%s ERROR %d\n", __func__, res);
#endif
return false; /* nothing to display */
}
/* break splash string into display lines, doing proper word wrap */
const char *lastbreak = splash_buf;
while(true)
if (*lastbreak == '\f') /* only as first character - Reset splash box size */
{
maxw = 0;
maxh = 0;
}
while(true) /* break splash string into display lines, doing proper word wrap */
{
while (*lastbreak != '\0') /* handle escape chars*/
{
switch (*lastbreak) /* all chars in matchstr */
{
case '\t': /*fallthrough*/
has_tabs = true; /* left justify (right justify for RTL)*/
case '\n':
{
if (lines[line].len > 0 || *lastbreak != '\t')
@ -143,16 +151,7 @@ static bool splash_internal(struct screen * screen, const char *fmt, va_list ap,
}
break;
}
case '\f':
{
if (lastbreak == splash_buf) /* only as first character */
{
/* Reset splash box size */
maxw = 0;
maxh = 0;
}
break; /* acts the same as a space character */
}
case '\f': /*fallthrough*/
case '\v': /*fallthrough*/
case '\r':
break; /* acts the same as a space character */
@ -199,20 +198,22 @@ static bool splash_internal(struct screen * screen, const char *fmt, va_list ap,
if (w > width)
{
const char *nxp, *nx = next;
int nw, newlen, oldlen = next_len;
int nw, newlen;
int oldlen = next_len;
while (nx - next < oldlen) /* try to split at a space char */
{
nxp = nx;
nx++;
if (*nxp != ' ')
if (*nxp != ' ' && *nx != '\0') /* split on space or EOL */
continue;
newlen = nxp - next;
nw = font_getstringnsize(next, newlen, NULL, NULL, fontnum);
if (nw > width)
{
/* is room left on this line & next word large enough? */
if (w + space_w * 5 < width && nw - space_w * 8 > w)
/* is next word larger than max width & room left on this line? */
if (nw - w > width && w + space_w * 8 < width)
w = nw;
break;
}
@ -246,11 +247,13 @@ static bool splash_internal(struct screen * screen, const char *fmt, va_list ap,
if (height > vp->height)
height = vp->height;
/* center the vp in the screen area */
vp->x += (vp->width - width) / 2;
vp->y += (vp->height - height) / 2;
vp->width = width;
vp->height = height;
vp->flags |= VP_FLAG_ALIGN_CENTER;
if (!has_tabs)
vp->flags |= VP_FLAG_ALIGN_CENTER;
/* prevent artifacts by locking to max width & height observed on repeated calls */
max_width[screen->screen_type] = width - 2*RECT_SPACING;