tools/nolibc/stdlib: add a simple getenv() implementation

This implementation relies on an extern definition of the environ
variable, that the caller must declare and initialize from envp.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

diff --git a/tools/include/nolibc/stdlib.h b/tools/include/nolibc/stdlib.h
index 733105c574eeab56b35e950d0e926604f9bf6181..aca8616335e3719d206d7d0b78aae8e094842c06 100644 (file)
--- a/tools/include/nolibc/stdlib.h
+++ b/tools/include/nolibc/stdlib.h
@@ -60,6 +60,29 @@ int atoi(const char *s)
        return atol(s);
 }
 
+/* Tries to find the environment variable named <name> in the environment array
+ * pointed to by global variable "environ" which must be declared as a char **,
+ * and must be terminated by a NULL (it is recommended to set this variable to
+ * the "envp" argument of main()). If the requested environment variable exists
+ * its value is returned otherwise NULL is returned.
+ */
+static __attribute__((unused))
+char *getenv(const char *name)
+{
+       extern char **environ;
+       int idx, i;
+
+       if (environ) {
+               for (idx = 0; environ[idx]; idx++) {
+                       for (i = 0; name[i] && name[i] == environ[idx][i];)
+                               i++;
+                       if (!name[i] && environ[idx][i] == '=')
+                               return &environ[idx][i+1];
+               }
+       }
+       return NULL;
+}
+
 /* Converts the unsigned long integer <in> to its hex representation into
  * buffer <buffer>, which must be long enough to store the number and the
  * trailing zero (17 bytes for "ffffffffffffffff" or 9 for "ffffffff"). The