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Fixed digit count in sscanf, e.g. "%1x"

This commit is contained in:
Sam Lantinga 2022-06-18 07:02:38 -07:00
parent 9065897514
commit 12f14bdbeb
1 changed files with 30 additions and 14 deletions
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44
src/stdlib/SDL_string.c
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@ -51,7 +51,7 @@ static unsigned UTF8_TrailingBytes(unsigned char c)
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOL) #if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOL)
static size_t static size_t
SDL_ScanLong(const char *text, int radix, long *valuep) SDL_ScanLong(const char *text, int count, int radix, long *valuep)
{ {
const char *textstart = text; const char *textstart = text;
long value = 0; long value = 0;
@ -78,6 +78,10 @@ SDL_ScanLong(const char *text, int radix, long *valuep)
value *= radix; value *= radix;
value += v; value += v;
++text; ++text;
if (count > 0 && (text - textstart) == count) {
break;
}
} }
if (valuep && text > textstart) { if (valuep && text > textstart) {
if (negative && value) { if (negative && value) {
@ -92,7 +96,7 @@ SDL_ScanLong(const char *text, int radix, long *valuep)
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD) #if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOUL) || !defined(HAVE_STRTOD)
static size_t static size_t
SDL_ScanUnsignedLong(const char *text, int radix, unsigned long *valuep) SDL_ScanUnsignedLong(const char *text, int count, int radix, unsigned long *valuep)
{ {
const char *textstart = text; const char *textstart = text;
unsigned long value = 0; unsigned long value = 0;
@ -114,6 +118,10 @@ SDL_ScanUnsignedLong(const char *text, int radix, unsigned long *valuep)
value *= radix; value *= radix;
value += v; value += v;
++text; ++text;
if (count > 0 && (text - textstart) == count) {
break;
}
} }
if (valuep && text > textstart) { if (valuep && text > textstart) {
*valuep = value; *valuep = value;
@ -156,7 +164,7 @@ SDL_ScanUintPtrT(const char *text, int radix, uintptr_t * valuep)
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOLL) #if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOLL)
static size_t static size_t
SDL_ScanLongLong(const char *text, int radix, Sint64 * valuep) SDL_ScanLongLong(const char *text, int count, int radix, Sint64 * valuep)
{ {
const char *textstart = text; const char *textstart = text;
Sint64 value = 0; Sint64 value = 0;
@ -183,6 +191,10 @@ SDL_ScanLongLong(const char *text, int radix, Sint64 * valuep)
value *= radix; value *= radix;
value += v; value += v;
++text; ++text;
if (count > 0 && (text - textstart) == count) {
break;
}
} }
if (valuep && text > textstart) { if (valuep && text > textstart) {
if (negative && value) { if (negative && value) {
@ -197,7 +209,7 @@ SDL_ScanLongLong(const char *text, int radix, Sint64 * valuep)
#if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOULL) #if !defined(HAVE_VSSCANF) || !defined(HAVE_STRTOULL)
static size_t static size_t
SDL_ScanUnsignedLongLong(const char *text, int radix, Uint64 * valuep) SDL_ScanUnsignedLongLong(const char *text, int count, int radix, Uint64 * valuep)
{ {
const char *textstart = text; const char *textstart = text;
Uint64 value = 0; Uint64 value = 0;
@ -219,6 +231,10 @@ SDL_ScanUnsignedLongLong(const char *text, int radix, Uint64 * valuep)
value *= radix; value *= radix;
value += v; value += v;
++text; ++text;
if (count > 0 && (text - textstart) == count) {
break;
}
} }
if (valuep && text > textstart) { if (valuep && text > textstart) {
*valuep = value; *valuep = value;
@ -240,7 +256,7 @@ SDL_ScanFloat(const char *text, double *valuep)
negative = SDL_TRUE; negative = SDL_TRUE;
++text; ++text;
} }
text += SDL_ScanUnsignedLong(text, 10, &lvalue); text += SDL_ScanUnsignedLong(text, 0, 10, &lvalue);
value += lvalue; value += lvalue;
if (*text == '.') { if (*text == '.') {
int mult = 10; int mult = 10;
@ -872,7 +888,7 @@ SDL_strtol(const char *string, char **endp, int base)
} }
} }
len = SDL_ScanLong(string, base, &value); len = SDL_ScanLong(string, 0, base, &value);
if (endp) { if (endp) {
*endp = (char *) string + len; *endp = (char *) string + len;
} }
@ -897,7 +913,7 @@ SDL_strtoul(const char *string, char **endp, int base)
} }
} }
len = SDL_ScanUnsignedLong(string, base, &value); len = SDL_ScanUnsignedLong(string, 0, base, &value);
if (endp) { if (endp) {
*endp = (char *) string + len; *endp = (char *) string + len;
} }
@ -922,7 +938,7 @@ SDL_strtoll(const char *string, char **endp, int base)
} }
} }
len = SDL_ScanLongLong(string, base, &value); len = SDL_ScanLongLong(string, 0, base, &value);
if (endp) { if (endp) {
*endp = (char *) string + len; *endp = (char *) string + len;
} }
@ -947,7 +963,7 @@ SDL_strtoull(const char *string, char **endp, int base)
} }
} }
len = SDL_ScanUnsignedLongLong(string, base, &value); len = SDL_ScanUnsignedLongLong(string, 0, base, &value);
if (endp) { if (endp) {
*endp = (char *) string + len; *endp = (char *) string + len;
} }
@ -1125,7 +1141,7 @@ SDL_vsscanf(const char *text, const char *fmt, va_list ap)
suppress = SDL_TRUE; suppress = SDL_TRUE;
++fmt; ++fmt;
} }
fmt += SDL_ScanLong(fmt, 10, &count); fmt += SDL_ScanLong(fmt, 0, 10, &count);
if (*fmt == 'c') { if (*fmt == 'c') {
if (!count) { if (!count) {
@ -1189,7 +1205,7 @@ SDL_vsscanf(const char *text, const char *fmt, va_list ap)
case 'd': case 'd':
if (inttype == DO_LONGLONG) { if (inttype == DO_LONGLONG) {
Sint64 value; Sint64 value;
advance = SDL_ScanLongLong(text, radix, &value); advance = SDL_ScanLongLong(text, count, radix, &value);
text += advance; text += advance;
if (advance && !suppress) { if (advance && !suppress) {
Sint64 *valuep = va_arg(ap, Sint64 *); Sint64 *valuep = va_arg(ap, Sint64 *);
@ -1198,7 +1214,7 @@ SDL_vsscanf(const char *text, const char *fmt, va_list ap)
} }
} else { } else {
long value; long value;
advance = SDL_ScanLong(text, radix, &value); advance = SDL_ScanLong(text, count, radix, &value);
text += advance; text += advance;
if (advance && !suppress) { if (advance && !suppress) {
switch (inttype) { switch (inttype) {
@ -1243,7 +1259,7 @@ SDL_vsscanf(const char *text, const char *fmt, va_list ap)
case 'u': case 'u':
if (inttype == DO_LONGLONG) { if (inttype == DO_LONGLONG) {
Uint64 value = 0; Uint64 value = 0;
advance = SDL_ScanUnsignedLongLong(text, radix, &value); advance = SDL_ScanUnsignedLongLong(text, count, radix, &value);
text += advance; text += advance;
if (advance && !suppress) { if (advance && !suppress) {
Uint64 *valuep = va_arg(ap, Uint64 *); Uint64 *valuep = va_arg(ap, Uint64 *);
@ -1252,7 +1268,7 @@ SDL_vsscanf(const char *text, const char *fmt, va_list ap)
} }
} else { } else {
unsigned long value = 0; unsigned long value = 0;
advance = SDL_ScanUnsignedLong(text, radix, &value); advance = SDL_ScanUnsignedLong(text, count, radix, &value);
text += advance; text += advance;
if (advance && !suppress) { if (advance && !suppress) {
switch (inttype) { switch (inttype) {