qemu: Add strtosz_suffix_unit function

This function does the same as the strtosz_suffix function
except that it allows to specify the unit to which the
k/M/B/T suffixes apply. This function will be used later to
parse the tsc-frequency from the command-line.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>

cutils.c

@@ -322,7 +322,8 @@ int fcntl_setfl(int fd, int flag)
  * value must be terminated by whitespace, ',' or '\0'. Return -1 on
  * error.
  */
-int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix)
+int64_t strtosz_suffix_unit(const char *nptr, char **end,
+                            const char default_suffix, int64_t unit)
 {
     int64_t retval = -1;
     char *endptr;
@@ -362,20 +363,20 @@ int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix)
         }
         break;
     case STRTOSZ_DEFSUFFIX_KB:
-        mul = 1 << 10;
+        mul = unit;
         break;
     case 0:
         if (mul_required) {
             goto fail;
         }
     case STRTOSZ_DEFSUFFIX_MB:
-        mul = 1ULL << 20;
+        mul = unit * unit;
         break;
     case STRTOSZ_DEFSUFFIX_GB:
-        mul = 1ULL << 30;
+        mul = unit * unit * unit;
         break;
     case STRTOSZ_DEFSUFFIX_TB:
-        mul = 1ULL << 40;
+        mul = unit * unit * unit * unit;
         break;
     default:
         goto fail;
@@ -405,6 +406,11 @@ fail:
     return retval;
 }
 
+int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix)
+{
+        return strtosz_suffix_unit(nptr, end, default_suffix, 1024);
+}
+
 int64_t strtosz(const char *nptr, char **end)
 {
     return strtosz_suffix(nptr, end, STRTOSZ_DEFSUFFIX_MB);

qemu-common.h

@@ -157,6 +157,8 @@ int fcntl_setfl(int fd, int flag);
 #define STRTOSZ_DEFSUFFIX_B	'B'
 int64_t strtosz(const char *nptr, char **end);
 int64_t strtosz_suffix(const char *nptr, char **end, const char default_suffix);
+int64_t strtosz_suffix_unit(const char *nptr, char **end,
+                            const char default_suffix, int64_t unit);
 
 /* path.c */
 void init_paths(const char *prefix);