Viewing file:  warn-sprintf-no-nul.c (2.99 KB) -rw-r--r--
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/* PR tree-optimization/86552 - missing warning for reading past the end
of non-string arrays
Exercise non-string detection in sprintf.
{ dg-do compile }
{ dg-options "-O2 -Wno-array-bounds -Wall -ftrack-macro-expansion=0" } */
#include "range.h"
typedef __WCHAR_TYPE__ wchar_t;
extern int sprintf (char*, const char*, ...);
extern char *dst;
int i0 = 0;
int i1 = 1;
void sink (int, ...);
#define CONCAT(a, b) a ## b
#define CAT(a, b) CONCAT(a, b)
#define T(fmt, ...) \
sink (sprintf (dst, fmt, __VA_ARGS__))
const char a[5] = "12345"; /* { dg-message "declared here" } */
const char b[6] = "123456"; /* { dg-message "declared here" } */
const char a2[][3] = {
"", "1", "12", "123", "123\000" /* { dg-warning "initializer-string for array of 'char' is too long" } */
};
void test_narrow (void)
{
/* Verify that precision suppresses the warning when it's less
than the size of the array. */
T ("%.0s%.1s%.2s%.3s%.4s%.5s", a, a, a, a, a, a);
T ("%s", a); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
T ("%.6s", a); /* { dg-warning ".%.6s. directive argument is not a nul-terminated string" } */
/* Exercise conditional expressions involving strings and non-strings. */
const char *s0 = i0 < 0 ? a2[0] : a2[3];
T ("%s", s0); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
s0 = i0 < 0 ? "123456" : a2[4];
T ("%s", s0); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
const char *s1 = i0 < 0 ? a2[3] : a2[0];
T ("%s", s1); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
const char *s2 = i0 < 0 ? a2[3] : a2[4];
T ("%s", s2); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
s0 = i0 < 0 ? a : b;
T ("%.5s", s0);
/* Verify that the warning triggers even if precision prevents
reading past the end of one of the non-terminated arrays but
not the other. */
T ("%.6s", s0); /* { dg-warning ".%.6s. directive argument is not a nul-terminated string" } */
s0 = i0 < 0 ? b : a;
T ("%.7s", s0); /* { dg-warning ".%.7s. directive argument is not a nul-terminated string" } */
/* Verify that at -Wformat-overflow=1 the lower bound of precision
given by a range is used to determine whether or not to warn. */
int r = SR (4, 5);
T ("%.*s", r, a);
T ("%.*s", r, b);
r = SR (5, 6);
T ("%.*s", r, a);
T ("%.*s", r, b);
r = SR (6, 7);
T ("%.*s", r, a); /* { dg-warning ".%.\\\*s. directive argument is not a nul-terminated string" } */
T ("%.*s", r, b);
}
const wchar_t wa[5] = L"12345"; /* { dg-message "declared here" } */
void test_wide (void)
{
T ("%.0ls%.1ls%.2ls%.3ls%.4ls%.5ls", wa, wa, wa, wa, wa, wa);
T ("%ls", wa); /* { dg-warning ".%ls. directive argument is not a nul-terminated string" } */
T ("%.6ls", wa); /* { dg-warning ".%.6ls. directive argument is not a nul-terminated string" } */
}
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