Add:support: Simple setenv/getenv for the support libc

git-svn-id: http://svn.code.sf.net/p/navit/code/trunk/navit@1690 ffa7fe5e-494d-0410-b361-a75ebd5db220

1 files changed, 85 insertions, 6 deletions

diff --git a/navit/support/libc/libc.c b/navit/support/libc/libc.c
index 42d77f6dc..982c79d1d 100644
--- a/navit/support/libc/libc.c
+++ b/navit/support/libc/libc.c
@@ -1,25 +1,104 @@
 #include "locale.h"
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
 int errno;
 
+static int at_exit_registered;
+#define REGISTER_AT_EXIT()					\
+	do {							\
+	if (!at_exit_registered)				\
+		at_exit_registered = !atexit(cleanup_libc);	\
+	} while(0)
+
+#define MAXENV 32
+static char *envnames[MAXENV];
+static char *envvars[MAXENV];
+
+static void cleanup_libc(void)
+{
+	int i;
+	for (i=0; i <MAXENV; i++) {
+		if (envnames[i])
+			free(envnames[i]);
+		if (envvars[i])
+			free(envvars[i]);
+	}
+}
+
 char *
 getenv(char *name)
 {
-	return 0;
+	int i;
+	REGISTER_AT_EXIT();
+	for (i=0; i < MAXENV; i++) {
+		if (envnames[i] && !strcmp(envnames[i], name))
+			return envvars[i];
+	}
+	return NULL;
 }
 
-void
-setenv(void)
+int
+setenv(const char *name, const char *value, int overwrite)
+{
+	int i;
+	char *val;
+	REGISTER_AT_EXIT();
+	for (i=0; i < MAXENV; i++) {
+		if (envnames[i] && !strcmp(envnames[i], name)) {
+			if (overwrite) {
+				val = strdup(value);
+				if (!val)
+					return -1;
+				if (envvars[i])
+					free(envvars[i]);
+				envvars[i] = val;
+			}
+			return 0;
+		}
+	}
+	for (i=0; i < MAXENV; i++) {
+		if (!envnames[i]) {
+			envnames[i] = strdup(name);
+			envvars[i] = strdup(value);
+			if (!envnames[i] || !envvars[i]) {
+				if (envnames[i])
+					free(envnames[i]);
+				if (envvars[i])
+					free(envvars[i]);
+				envnames[i] = NULL;
+				envvars[i] = NULL;
+				return -1;
+			}
+			return 0;
+		}
+	}
+	return -1;
+}
+
+int unsetenv(const char *name)
 {
+	int i;
+	for (i=0; i < MAXENV; i++) {
+		if (envnames[i] && !strcmp(envnames[i], name)) {
+			free(envnames[i]);
+			envnames[i] = NULL;
+			if (envvars[i])
+				free(envvars[i]);
+			envvars[i] = NULL;
+		}
+	}
+	return 0;
 }
 
 char *
-getcwd(void)
+getcwd(char *buf, int size)
 {
 	return "dummy";
 }
 
 char *
-getwd(void)
+getwd(char *buf)
 {
 	return "dummy";
 }
@@ -30,7 +109,7 @@ char *strtok_r(char *str, const char *delim, char **saveptr)
 }
 
 void
-perror(char *x)
+perror(const char *x)
 {
 }