[libxml2] Fix casting of line numbers in SAX2.c

[Nick Wellnhofer <nwellnhof src gnome org>]

commit a647e430259fc663c63caa502f0cee8c94e2d06d
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Tue Jan 25 02:59:40 2022 +0100

    Fix casting of line numbers in SAX2.c
    
    The line member is an unsigned short. Avoids integer conversion warnings
    with UBSan.
    
    Also use USHRT_MAX instead of hard-coded constant.

 SAX2.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)
---
diff --git a/SAX2.c b/SAX2.c
index 8c0084c6..03192465 100644
--- a/SAX2.c
+++ b/SAX2.c
@@ -1623,10 +1623,10 @@ xmlSAX2StartElement(void *ctx, const xmlChar *fullname, const xmlChar **atts)
     ctxt->nodemem = -1;
     if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
-           if (ctxt->input->line < 65535)
-               ret->line = (short) ctxt->input->line;
+           if (ctxt->input->line < USHRT_MAX)
+               ret->line = (unsigned short) ctxt->input->line;
            else
-               ret->line = 65535;
+               ret->line = USHRT_MAX;
        }
     }
 
@@ -1887,10 +1887,10 @@ skip:
 
     if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
-           if (ctxt->input->line < 65535)
-               ret->line = (short) ctxt->input->line;
+           if (ctxt->input->line < USHRT_MAX)
+               ret->line = (unsigned short) ctxt->input->line;
            else {
-               ret->line = 65535;
+               ret->line = USHRT_MAX;
                if (ctxt->options & XML_PARSE_BIG_LINES)
                    ret->psvi = (void *) (ptrdiff_t) ctxt->input->line;
            }
@@ -2267,10 +2267,10 @@ xmlSAX2StartElementNs(void *ctx,
     }
     if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
-           if (ctxt->input->line < 65535)
-               ret->line = (short) ctxt->input->line;
+           if (ctxt->input->line < USHRT_MAX)
+               ret->line = (unsigned short) ctxt->input->line;
            else
-               ret->line = 65535;
+               ret->line = USHRT_MAX;
        }
     }
 
@@ -2689,10 +2689,10 @@ xmlSAX2ProcessingInstruction(void *ctx, const xmlChar *target,
 
     if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
-           if (ctxt->input->line < 65535)
-               ret->line = (short) ctxt->input->line;
+           if (ctxt->input->line < USHRT_MAX)
+               ret->line = (unsigned short) ctxt->input->line;
            else
-               ret->line = 65535;
+               ret->line = USHRT_MAX;
        }
     }
     if (ctxt->inSubset == 1) {
@@ -2749,10 +2749,10 @@ xmlSAX2Comment(void *ctx, const xmlChar *value)
     if (ret == NULL) return;
     if (ctxt->linenumbers) {
        if (ctxt->input != NULL) {
-           if (ctxt->input->line < 65535)
-               ret->line = (short) ctxt->input->line;
+           if (ctxt->input->line < USHRT_MAX)
+               ret->line = (unsigned short) ctxt->input->line;
            else
-               ret->line = 65535;
+               ret->line = USHRT_MAX;
        }
     }