Mesa (main): util/debug: add an enable parsing helper

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Module: Mesa
Branch: main
Commit: 419274773750673da992e5bcb2292a1065434e31
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=419274773750673da992e5bcb2292a1065434e31

Author: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Date:   Sun May 22 15:46:48 2022 +0300

util/debug: add an enable parsing helper

This allows to parse something like :

 ENV_VAR=+a,-b

which will enable a and disable b.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Reviewed-by: Danylo Piliaiev <dpiliaiev at igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16717>

---

 src/util/debug.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/util/debug.h |  4 ++++
 2 files changed, 46 insertions(+)

diff --git a/src/util/debug.c b/src/util/debug.c
index 89ae6131074..b7b49ae8974 100644
--- a/src/util/debug.c
+++ b/src/util/debug.c
@@ -53,6 +53,48 @@ parse_debug_string(const char *debug,
    return flag;
 }
 
+uint64_t
+parse_enable_string(const char *debug,
+                    uint64_t default_value,
+                    const struct debug_control *control)
+{
+   uint64_t flag = default_value;
+
+   if (debug != NULL) {
+      for (; control->string != NULL; control++) {
+         if (!strcmp(debug, "all")) {
+            flag |= control->flag;
+
+         } else {
+            const char *s = debug;
+            unsigned n;
+
+            for (; n = strcspn(s, ", "), *s; s += MAX2(1, n)) {
+               bool enable;
+               if (s[0] == '+') {
+                  enable = true;
+                  s++; n--;
+               } else if (s[0] == '-') {
+                  enable = false;
+                  s++; n--;
+               } else {
+                  enable = true;
+               }
+               if (strlen(control->string) == n &&
+                   !strncmp(control->string, s, n)) {
+                  if (enable)
+                     flag |= control->flag;
+                  else
+                     flag &= ~control->flag;
+               }
+            }
+         }
+      }
+   }
+
+   return flag;
+}
+
 bool
 comma_separated_list_contains(const char *list, const char *s)
 {
diff --git a/src/util/debug.h b/src/util/debug.h
index bbcc1975545..6d48ea08fcf 100644
--- a/src/util/debug.h
+++ b/src/util/debug.h
@@ -39,6 +39,10 @@ struct debug_control {
 uint64_t
 parse_debug_string(const char *debug,
                    const struct debug_control *control);
+uint64_t
+parse_enable_string(const char *debug,
+                    uint64_t default_value,
+                    const struct debug_control *control);
 bool
 comma_separated_list_contains(const char *list, const char *s);
 bool