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//===-- sanitizer_common_interceptors_scanf.inc -----------------*- C++ -*-===//
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Scanf implementation for use in *Sanitizer interceptors.
//
//===----------------------------------------------------------------------===//
#include <stdarg.h>
#ifdef _WIN32
#define va_copy(dst, src) ((dst) = (src))
#endif // _WIN32
struct ScanfSpec {
char c;
unsigned size;
};
// One-letter specs.
static const ScanfSpec scanf_specs[] = {
{'p', sizeof(void *)},
{'e', sizeof(float)},
{'E', sizeof(float)},
{'a', sizeof(float)},
{'f', sizeof(float)},
{'g', sizeof(float)},
{'d', sizeof(int)},
{'i', sizeof(int)},
{'o', sizeof(int)},
{'u', sizeof(int)},
{'x', sizeof(int)},
{'X', sizeof(int)},
{'n', sizeof(int)},
{'t', sizeof(PTRDIFF_T)},
{'z', sizeof(SIZE_T)},
{'j', sizeof(INTMAX_T)},
{'h', sizeof(short)}
};
static const unsigned scanf_specs_cnt =
sizeof(scanf_specs) / sizeof(scanf_specs[0]);
// %ll?, %L?, %q? specs
static const ScanfSpec scanf_llspecs[] = {
{'e', sizeof(long double)},
{'f', sizeof(long double)},
{'g', sizeof(long double)},
{'d', sizeof(long long)},
{'i', sizeof(long long)},
{'o', sizeof(long long)},
{'u', sizeof(long long)},
{'x', sizeof(long long)}
};
static const unsigned scanf_llspecs_cnt =
sizeof(scanf_llspecs) / sizeof(scanf_llspecs[0]);
// %l? specs
static const ScanfSpec scanf_lspecs[] = {
{'e', sizeof(double)},
{'f', sizeof(double)},
{'g', sizeof(double)},
{'d', sizeof(long)},
{'i', sizeof(long)},
{'o', sizeof(long)},
{'u', sizeof(long)},
{'x', sizeof(long)},
{'X', sizeof(long)},
};
static const unsigned scanf_lspecs_cnt =
sizeof(scanf_lspecs) / sizeof(scanf_lspecs[0]);
static unsigned match_spec(const struct ScanfSpec *spec, unsigned n, char c) {
for (unsigned i = 0; i < n; ++i)
if (spec[i].c == c)
return spec[i].size;
return 0;
}
static void scanf_common(void *ctx, const char *format, va_list ap_const) {
va_list aq;
va_copy(aq, ap_const);
const char *p = format;
unsigned size;
while (*p) {
if (*p != '%') {
++p;
continue;
}
++p;
if (*p == '*' || *p == '%' || *p == 0) {
++p;
continue;
}
if (*p == '0' || (*p >= '1' && *p <= '9')) {
size = internal_atoll(p);
// +1 for the \0 at the end
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), size + 1);
++p;
continue;
}
if (*p == 'L' || *p == 'q') {
++p;
size = match_spec(scanf_llspecs, scanf_llspecs_cnt, *p);
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), size);
continue;
}
if (*p == 'l') {
++p;
if (*p == 'l') {
++p;
size = match_spec(scanf_llspecs, scanf_llspecs_cnt, *p);
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), size);
continue;
} else {
size = match_spec(scanf_lspecs, scanf_lspecs_cnt, *p);
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), size);
continue;
}
}
if (*p == 'h' && *(p + 1) == 'h') {
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), sizeof(char));
p += 2;
continue;
}
size = match_spec(scanf_specs, scanf_specs_cnt, *p);
if (size) {
COMMON_INTERCEPTOR_WRITE_RANGE(ctx, va_arg(aq, void *), size);
++p;
continue;
}
}
va_end(aq);
}
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