Mesa (master): util: add a env getter for versions

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Module: Mesa
Branch: master
Commit: 297ad1bbb310a580b888b8f38488f50740b5df90
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=297ad1bbb310a580b888b8f38488f50740b5df90

Author: Dave Airlie <airlied at redhat.com>
Date:   Tue Nov 10 09:56:21 2020 +1000

util: add a env getter for versions

This lets us parse a standard major.minor version.

Reviewed-by: Karol Herbst <kherbst at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7520>

---

 src/util/u_debug.c | 24 ++++++++++++++++++++++++
 src/util/u_debug.h |  3 +++
 2 files changed, 27 insertions(+)

diff --git a/src/util/u_debug.c b/src/util/u_debug.c
index e1c8265965f..f3a4615ef8f 100644
--- a/src/util/u_debug.c
+++ b/src/util/u_debug.c
@@ -216,6 +216,30 @@ debug_get_num_option(const char *name, long dfault)
    return result;
 }
 
+void
+debug_get_version_option(const char *name, unsigned *major, unsigned *minor)
+{
+   const char *str;
+
+   str = os_get_option(name);
+   if (str) {
+      unsigned v_maj, v_min;
+      int n;
+
+      n = sscanf(str, "%u.%u", &v_maj, &v_min);
+      if (n != 2) {
+         debug_printf("Illegal version specified for %s : %s\n", name, str);
+         return;
+      }
+      *major = v_maj;
+      *minor = v_min;
+   }
+
+   if (debug_get_option_should_print())
+      debug_printf("%s: %s = %u.%u\n", __FUNCTION__, name, *major, *minor);
+
+   return;
+}
 
 static bool
 str_has_option(const char *str, const char *name)
diff --git a/src/util/u_debug.h b/src/util/u_debug.h
index a9e44bf24e2..fc06c582b0d 100644
--- a/src/util/u_debug.h
+++ b/src/util/u_debug.h
@@ -157,6 +157,9 @@ debug_disable_error_message_boxes(void);
 long
 debug_get_num_option(const char *name, long dfault);
 
+void
+debug_get_version_option(const char *name, unsigned *major, unsigned *minor);
+
 #ifdef _MSC_VER
 __declspec(noreturn)
 #endif