fuse: nfs export special lookups

[pandora-kernel.git] / lib / vsprintf.c

diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 6021757..1dc2d1d 100644 (file)
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -22,6 +22,8 @@
 #include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/kernel.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
 
 #include <asm/page.h>          /* for PAGE_SIZE */
 #include <asm/div64.h>
@@ -482,6 +484,89 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
        return buf;
 }
 
+static char *string(char *buf, char *end, char *s, int field_width, int precision, int flags)
+{
+       int len, i;
+
+       if ((unsigned long)s < PAGE_SIZE)
+               s = "<NULL>";
+
+       len = strnlen(s, precision);
+
+       if (!(flags & LEFT)) {
+               while (len < field_width--) {
+                       if (buf < end)
+                               *buf = ' ';
+                       ++buf;
+               }
+       }
+       for (i = 0; i < len; ++i) {
+               if (buf < end)
+                       *buf = *s;
+               ++buf; ++s;
+       }
+       while (len < field_width--) {
+               if (buf < end)
+                       *buf = ' ';
+               ++buf;
+       }
+       return buf;
+}
+
+static inline void *dereference_function_descriptor(void *ptr)
+{
+#if defined(CONFIG_IA64) || defined(CONFIG_PPC64)
+       void *p;
+       if (!probe_kernel_address(ptr, p))
+               ptr = p;
+#endif
+       return ptr;
+}
+
+static char *symbol_string(char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+       unsigned long value = (unsigned long) ptr;
+#ifdef CONFIG_KALLSYMS
+       char sym[KSYM_SYMBOL_LEN];
+       sprint_symbol(sym, value);
+       return string(buf, end, sym, field_width, precision, flags);
+#else
+       field_width = 2*sizeof(void *);
+       flags |= SPECIAL | SMALL | ZEROPAD;
+       return number(buf, end, value, 16, field_width, precision, flags);
+#endif
+}
+
+/*
+ * Show a '%p' thing.  A kernel extension is that the '%p' is followed
+ * by an extra set of alphanumeric characters that are extended format
+ * specifiers.
+ *
+ * Right now we just handle 'F' (for symbolic Function descriptor pointers)
+ * and 'S' (for Symbolic direct pointers), but this can easily be
+ * extended in the future (network address types etc).
+ *
+ * The difference between 'S' and 'F' is that on ia64 and ppc64 function
+ * pointers are really function descriptors, which contain a pointer the
+ * real address. 
+ */
+static char *pointer(const char *fmt, char *buf, char *end, void *ptr, int field_width, int precision, int flags)
+{
+       switch (*fmt) {
+       case 'F':
+               ptr = dereference_function_descriptor(ptr);
+               /* Fallthrough */
+       case 'S':
+               return symbol_string(buf, end, ptr, field_width, precision, flags);
+       }
+       flags |= SMALL;
+       if (field_width == -1) {
+               field_width = 2*sizeof(void *);
+               flags |= ZEROPAD;
+       }
+       return number(buf, end, (unsigned long) ptr, 16, field_width, precision, flags);
+}
+
 /**
  * vsnprintf - Format a string and place it in a buffer
  * @buf: The buffer to place the result into
@@ -502,11 +587,9 @@ static char *number(char *buf, char *end, unsigned long long num, int base, int
  */
 int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
 {
-       int len;
        unsigned long long num;
-       int i, base;
+       int base;
        char *str, *end, c;
-       const char *s;
 
        int flags;              /* flags to number() */
 
@@ -622,43 +705,18 @@ int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
                                continue;
 
                        case 's':
-                               s = va_arg(args, char *);
-                               if ((unsigned long)s < PAGE_SIZE)
-                                       s = "<NULL>";
-
-                               len = strnlen(s, precision);
-
-                               if (!(flags & LEFT)) {
-                                       while (len < field_width--) {
-                                               if (str < end)
-                                                       *str = ' ';
-                                               ++str;
-                                       }
-                               }
-                               for (i = 0; i < len; ++i) {
-                                       if (str < end)
-                                               *str = *s;
-                                       ++str; ++s;
-                               }
-                               while (len < field_width--) {
-                                       if (str < end)
-                                               *str = ' ';
-                                       ++str;
-                               }
+                               str = string(str, end, va_arg(args, char *), field_width, precision, flags);
                                continue;
 
                        case 'p':
-                               flags |= SMALL;
-                               if (field_width == -1) {
-                                       field_width = 2*sizeof(void *);
-                                       flags |= ZEROPAD;
-                               }
-                               str = number(str, end,
-                                               (unsigned long) va_arg(args, void *),
-                                               16, field_width, precision, flags);
+                               str = pointer(fmt+1, str, end,
+                                               va_arg(args, void *),
+                                               field_width, precision, flags);
+                               /* Skip all alphanumeric pointer suffixes */
+                               while (isalnum(fmt[1]))
+                                       fmt++;
                                continue;
 
-
                        case 'n':
                                /* FIXME:
                                * What does C99 say about the overflow case here? */