#define unsigned_mult_overflows(a, b) \
((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
+/*
+ * Returns true if the left shift of "a" by "shift" bits will
+ * overflow. The type of "a" must be unsigned.
+ */
+#define unsigned_left_shift_overflows(a, shift) \
+ ((shift) < bitsizeof(a) && \
+ (a) > maximum_unsigned_value_of_type(a) >> (shift))
+
#ifdef __GNUC__
#define TYPEOF(x) (__typeof__(x))
#else
#ifdef NO_UNSETENV
#define unsetenv gitunsetenv
-void gitunsetenv(const char *);
+int gitunsetenv(const char *);
#endif
#ifdef NO_STRCASESTR
return a - b;
}
+static inline size_t st_left_shift(size_t a, unsigned shift)
+{
+ if (unsigned_left_shift_overflows(a, shift))
+ die("size_t overflow: %"PRIuMAX" << %u",
+ (uintmax_t)a, shift);
+ return a << shift;
+}
+
+static inline unsigned long cast_size_t_to_ulong(size_t a)
+{
+ if (a != (unsigned long)a)
+ die("object too large to read on this platform: %"
+ PRIuMAX" is cut off to %lu",
+ (uintmax_t)a, (unsigned long)a);
+ return (unsigned long)a;
+}
+
#ifdef HAVE_ALLOCA_H
# include <alloca.h>
# define xalloca(size) (alloca(size))
void *xrealloc(void *ptr, size_t size);
void *xcalloc(size_t nmemb, size_t size);
void xsetenv(const char *name, const char *value, int overwrite);
-void xunsetenv(const char *name);
void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
const char *mmap_os_err(void);
void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);