[PATCH v3 12/14 RESEND] xenpm: Factor out a non-fatal cpuid_parse variant

[Jason Andryuk <jandryuk@xxxxxxxxx>]

Allow cpuid_parse to be re-used without terminating xenpm.  HWP will
re-use it to optionally parse a cpuid.  Unlike other uses of
cpuid_parse, parse_hwp_opts will take a variable number of arguments and
cannot just check argc.

Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
---
v2:
Retained because cpuid_parse handles numeric cpu numbers and "all".
---
 tools/misc/xenpm.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index b2defde0d4..6e74606970 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -79,17 +79,26 @@ void help_func(int argc, char *argv[])
     show_help();
 }
 
-static void parse_cpuid(const char *arg, int *cpuid)
+static int parse_cpuid_non_fatal(const char *arg, int *cpuid)
 {
     if ( sscanf(arg, "%d", cpuid) != 1 || *cpuid < 0 )
     {
         if ( strcasecmp(arg, "all") )
-        {
-            fprintf(stderr, "Invalid CPU identifier: '%s'\n", arg);
-            exit(EINVAL);
-        }
+            return -1;
+
         *cpuid = -1;
     }
+
+    return 0;
+}
+
+static void parse_cpuid(const char *arg, int *cpuid)
+{
+    if ( parse_cpuid_non_fatal(arg, cpuid) )
+    {
+        fprintf(stderr, "Invalid CPU identifier: '%s'\n", arg);
+        exit(EINVAL);
+    }
 }
 
 static void parse_cpuid_and_int(int argc, char *argv[],
-- 
2.40.0