Add more practical examplesHEADmaster

lang.c example automatically redirects to a particular website
version, based on the language prefernces of the user.

style.c cycles through a range of CSS styles.

1 files changed, 69 insertions, 0 deletions

diff --git a/examples/lang.c b/examples/lang.c
new file mode 100644
index 0000000..eb6336e
--- /dev/null
+++ b/examples/lang.c
@@ -0,0 +1,69 @@
+#include <magi.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+static char *scat(const char *a, const char *b)
+{
+    int   alen = a ? strlen(a) : 0;
+    int   blen = b ? strlen(b) : 0;
+    char *res  = malloc(alen + blen + 1);
+    memcpy(res, a, alen);
+    memcpy(res + alen, b, blen);
+    res[alen + blen] = 0;
+    return res;
+}
+
+
+static const char *determ(const char *langprefs)
+{
+    int i;
+    const char *langs[] = { "en", "ru" };
+    const int langslen = 2;
+    const char *min = 0;
+    int minid = 0;
+    for (i = 0; i != langslen; ++i) {
+        const char *res = strstr(langprefs, langs[i]);
+        if (min == 0 || res < min) {
+            min = res;
+            minid = i;
+        }
+    }
+    return langs[minid];
+}
+
+static void response(struct magi_request *req)
+{
+    struct magi_response res;
+    const char *lang = getenv("HTTP_ACCEPT_LANGUAGE");
+    char *a = scat(req->script, req->path);
+    char *b = scat(determ(lang), a);
+    free(a);
+    a = scat("/", b);
+    free(b);
+    b = scat(req->host, a);
+    free(a);
+    a = scat("https://", b);
+    free(b);
+    magi_response_init(&res);
+    magi_response_status(&res, 302, "Moved Temporarily");
+    magi_response_header(&res, "Location", a);
+    free(a);
+    magi_response_send(&res);
+    magi_response_free(&res);
+}
+
+
+int main()
+{
+    struct magi_request request;
+    magi_request_init(&request);
+    if (magi_parse(&request)) {
+        response(&request);
+    } else {
+        magi_error_response(request.error);
+    }
+    magi_request_free(&request);
+    return 0;
+}