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Fix Issue#1235: Sanitize XML comment to prevent invalid token errors #1642

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Fix Issue#1235: Sanitize XML comment to prevent invalid token errors #1642

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27 changes: 26 additions & 1 deletion src/lib_ccx/ccx_encoders_spupng.c
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Original file line number Diff line number Diff line change
Expand Up @@ -198,7 +198,32 @@ void write_sputag_close(struct spupng_t *sp)
}
void write_spucomment(struct spupng_t *sp, const char *str)
{
fprintf(sp->fpxml, "<!--\n%s\n-->\n", str);
fprintf(sp->fpxml, "<!--\n");

const char *p = str;
const char *last_safe_pos = str; // Track the last safe position to flush

while (*p) {

if (*p == '-' && *(p + 1) == '-') {

if (p > last_safe_pos) {
fwrite(last_safe_pos, 1, p - last_safe_pos, sp->fpxml);
}

fputc('-', sp->fpxml);
p += 2;
last_safe_pos = p;
} else {
p++;
}
}

if (p > last_safe_pos) {
fwrite(last_safe_pos, 1, p - last_safe_pos, sp->fpxml);
}

fprintf(sp->fpxml, "\n-->\n");
}

char *get_spupng_filename(void *ctx)
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