1 files changed, 68 insertions, 0 deletions
diff --git a/lib/envop.h b/lib/envop.h
new file mode 100644
index 0000000..054152e
--- /dev/null
+++ b/lib/envop.h
@@ -0,0 +1,68 @@
+/* Environment and environment operation definitions for GNU Pies.
+   Copyright (C) 2019 Sergey Poznyakoff
+
+   GNU Pies is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GNU Pies is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GNU Pies.  If not, see <http://www.gnu.org/licenses/>. */
+
+/* Environment structure */
+struct environ
+{
+  char **env_base;
+  size_t env_count;
+  size_t env_max;
+};
+typedef struct environ environ_t;
+
+environ_t *environ_create (char **);
+void environ_free (environ_t *env);
+int environ_add (environ_t *env, char const *def);
+int environ_set (environ_t *env, char const *name, char const *val);
+int environ_unset (environ_t *env, char const *name);
+int environ_unset_glob (environ_t *env, const char *pattern);
+static inline char **
+environ_ptr (environ_t *env)
+{
+  return env->env_base;
+}
+
+/* Environment operation codes.
+   Elements in a oplist are sorted in that order. */
+enum envop_code
+  {
+    envop_clear,   /* Clear environment */
+    envop_keep,    /* Keep variable when clearing */
+    envop_set,     /* Set variable */
+    envop_unset    /* Unset variable */
+  };
+
+struct envop_entry    /* Environment operation entry */
+{
+  struct envop_entry *next; /* Next entry in the list */
+  enum envop_code code;     /* Operation code */
+  char *name;               /* Variable name (or globbing pattern) */
+  char *value;              /* Value of the variable */
+};
+
+typedef struct envop_entry envop_t;
+
+int wildmatch (char const *expr, char const *name, size_t len);
+
+int envop_entry_add (envop_t **head,
+		     enum envop_code code,
+		     char const *name, char const *value);
+
+int envop_exec (envop_t *op, environ_t *env);
+void envop_free (envop_t *op);
+
+
+