From 96cf8dffe4f7b0b910f790066ae622dc429eb522 Mon Sep 17 00:00:00 2001
From: Jannis Hoffmann <jannis@fehcom.de>
Date: Tue, 9 Jul 2024 13:02:45 +0200
Subject: initial commit of version 23

---
 env.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 env.c

(limited to 'env.c')

diff --git a/env.c b/env.c
new file mode 100644
index 0000000..2ecaa83
--- /dev/null
+++ b/env.c
@@ -0,0 +1,136 @@
+#include "str.h"
+#include "alloc.h"
+#include "env.h"
+
+/**
+	@file env.c
+	@author djb
+	@source ucspi-tcp
+	@brief	setting up environment after fork
+*/
+
+extern /*@null@*/char *env_get(char *s) 
+{
+  int i;
+  unsigned int len;
+
+  if (!s) return 0;
+  len = str_len(s);
+  for (i = 0; environ[i]; ++i)
+    if (str_start(environ[i],s) && (environ[i][len] == '='))
+      return environ[i] + len + 1;
+  return 0;
+}
+
+extern char *env_findeq(char *s) 
+{
+  for (; *s; ++s)
+    if (*s == '=') return s;
+  return 0;
+}
+
+int env_isinit = 0; /* if env_isinit: */
+static int ea;      /* environ is a pointer to ea+1 char*'s. */
+static int en;      /* the first en of those are ALLOCATED. environ[en] is 0. */
+
+static void env_del(int i) {
+  alloc_free(environ[i]);
+  environ[i] = environ[--en];
+  environ[en] = 0;
+}
+
+static void env_unsetlen(char *s,int len) 
+{
+  int i;
+
+  for (i = en - 1; i >= 0; --i)
+    if (!str_diffn(s,environ[i],len))
+      if (environ[i][len] == '=')
+        env_del(i);
+}
+
+int env_unset(char *s)
+{
+  if (!env_isinit) 
+    if (!env_init()) return 0;
+  env_unsetlen(s,str_len(s));
+  return 1;
+}
+
+int env_set(char *s) {
+  char *t;
+
+  t = env_findeq(s);
+  if (t) env_unsetlen(s,t - s);
+  if (en == ea) {
+    ea += 30;
+    if (!alloc_re(&environ,(en + 1) * sizeof(char *),(ea + 1) * sizeof(char *)))
+      { ea = en; return 0; }
+  }
+  environ[en++] = s;
+  environ[en] = 0;
+  return 1;
+}
+
+int env_puts(char *s) {
+  char *u;
+
+  if (!env_isinit) 
+    if (!env_init()) return 0;
+  u = alloc(str_len(s) + 1);
+  if (!u) return 0;
+  str_copy(u,s);
+  if (!env_set(u)) { alloc_free(u); return 0; }
+  return 1;
+}
+
+int env_put(char *name,char *value) {
+  char *ln;
+  int len;
+
+  if (!env_isinit) 
+    if (!env_init()) return 0;
+  len = str_len(name);
+  ln = alloc(len + str_len(value) + 2);
+  if (!ln) return 0;
+  str_copy(ln,name);
+  ln[len] = '=';
+  str_copy(ln + len + 1,value);
+  if (!env_set(ln)) { alloc_free(ln); return 0; }
+  return 1;
+}
+
+int env_init() {
+  char **newenviron;
+  int i;
+
+  for (en = 0; environ[en]; ++en)
+    ;
+  ea = en + 10;
+  newenviron = (char **) alloc((ea + 1) * sizeof(char *));
+  if (!newenviron) return 0;
+
+  for (en = 0; environ[en]; ++en) {
+    newenviron[en] = alloc(str_len(environ[en]) + 1);
+    if (!newenviron[en]) {
+      for (i = 0; i < en; ++i) alloc_free(newenviron[i]);
+        alloc_free(newenviron);
+        return 0;
+    }
+    str_copy(newenviron[en],environ[en]);
+  }
+
+  newenviron[en] = 0;
+  environ = newenviron;
+  env_isinit = 1;
+  return 1;
+}
+
+static char *null = 0;
+
+void env_clear() {
+  if (env_isinit) 
+    while (en) env_del(0);
+  else environ = &null;
+}
+extern char *env_pick() { return environ[0]; }
-- 
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