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Added support for the "%n" sscanf format specifier

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This commit is contained in:
Sam Lantinga
2025-02-24 18:49:31 -08:00
parent e6a24fcbb5
commit 6980325310
2 changed files with 61 additions and 20 deletions
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31
src/stdlib/SDL_string.c
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@@ -1448,6 +1448,7 @@ static bool CharacterMatchesSet(char c, const char *set, size_t set_len)
// NOLINTNEXTLINE(readability-non-const-parameter)
int SDL_vsscanf(const char *text, SDL_SCANF_FORMAT_STRING const char *fmt, va_list ap)
{
const char *start = text;
int result = 0;
if (!text || !*text) {
@@ -1718,6 +1719,36 @@ int SDL_vsscanf(const char *text, SDL_SCANF_FORMAT_STRING const char *fmt, va_li
}
done = true;
break;
case 'n':
switch (inttype) {
case DO_SHORT:
{
short *valuep = va_arg(ap, short *);
*valuep = (short)(text - start);
} break;
case DO_INT:
{
int *valuep = va_arg(ap, int *);
*valuep = (int)(text - start);
} break;
case DO_LONG:
{
long *valuep = va_arg(ap, long *);
*valuep = (long)(text - start);
} break;
case DO_LONGLONG:
{
long long *valuep = va_arg(ap, long long *);
*valuep = (long long)(text - start);
} break;
case DO_SIZE_T:
{
size_t *valuep = va_arg(ap, size_t *);
*valuep = (size_t)(text - start);
} break;
}
done = true;
break;
case '[':
{
const char *set = fmt + 1;