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-rw-r--r--plugins/libre_redirect/README.md3
-rw-r--r--plugins/libre_redirect/libre_redirect.c84
-rw-r--r--plugins/libre_redirect/libre_redirect.h6
-rw-r--r--plugins/libre_redirect/str_replace_start.c65
-rw-r--r--plugins/libre_redirect/str_replace_start.h4
-rw-r--r--plugins/libre_redirect/str_replace_test/build-example.sh11
-rw-r--r--plugins/libre_redirect/str_replace_test/example.c19
7 files changed, 192 insertions, 0 deletions
diff --git a/plugins/libre_redirect/README.md b/plugins/libre_redirect/README.md
new file mode 100644
index 0000000..f3f58c9
--- /dev/null
+++ b/plugins/libre_redirect/README.md
@@ -0,0 +1,3 @@
+## About
+
+This code automatically redirects webpage to their open-source frontends. It is based on <https://libredirect.codeberg.page/> \ No newline at end of file
diff --git a/plugins/libre_redirect/libre_redirect.c b/plugins/libre_redirect/libre_redirect.c
new file mode 100644
index 0000000..3794add
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.c
@@ -0,0 +1,84 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "str_replace_start.h"
+
+#define LIBRE_N 19
+
+/* Uncomment for debug */
+/* #define DEBUG */
+
+/* Inspired by https://libredirect.github.io/, but in C. */
+
+void str_init(char* str, int n)
+{
+ for (int i = 0; i < n; i++)
+ str[i] = ' ';
+ str[n] = '\0';
+} // could also use <https://manpages.ubuntu.com/manpages/impish/man3/strinit.3pub.html>
+
+int libre_redirect(const char* uri, char* output)
+{
+ int l1 = strlen(uri);
+ int l2 = strlen(output);
+ int len;
+ char tmp_uri[l2++];
+ char tmp_output[l2++];
+
+ if ((l2 - l1) < LIBRE_N) {
+#ifdef DEBUG
+ printf("Not enough memory\n");
+#endif
+ return 1; // not enough memory.
+ } else {
+ strcpy(tmp_uri, uri); // strcpy also copies the terminating '\0'
+ strcpy(tmp_output, output);
+
+ char* annoying_sites[] = {
+ "https://www.youtube.com",
+ "https://www.reddit.com",
+ "https://medium.com",
+ "https://translate.google.com",
+ // "https://forum.effectivealtruism.org",
+ "https://www.bloomberg.com",
+ "https://twitter.com"
+ };
+
+ char* alternatives[] = {
+ "https://yt.artemislena.eu",
+ "https://teddit.nunosempere.com",
+ "https://scribe.rip",
+ "https://simplytranslate.org/",
+ // "https://ea.greaterwrong.com",
+ "https://archive.is/https://www.bloomberg.com",
+ "https://nitter.net"
+ };
+
+ len = sizeof(annoying_sites) / sizeof(annoying_sites[0]);
+
+ for (int i = 0; i < len; i++) {
+ int replace_check = str_replace_start(tmp_uri, annoying_sites[i],
+ alternatives[i], output);
+ if (replace_check == 2) {
+#ifdef DEBUG
+ printf("tmp_uri: %s\n", tmp_uri);
+ printf("output: %s\n", output);
+#endif
+ return 2;
+ } else if (replace_check == 1) {
+#ifdef DEBUG
+ printf("replace_check failed\n");
+#endif
+ return 1;
+ }
+ strcpy(tmp_uri, output);
+ str_init(output, l2);
+ }
+ strcpy(output, tmp_uri);
+ }
+#ifdef DEBUG
+ printf("No match found\n\n");
+#endif
+ return 0;
+}
diff --git a/plugins/libre_redirect/libre_redirect.h b/plugins/libre_redirect/libre_redirect.h
new file mode 100644
index 0000000..150c95e
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#define LIBRE_N 19
+
+int libre_redirect(const char* uri, char* uri_filtered);
+void str_init(char* str, int n);
diff --git a/plugins/libre_redirect/str_replace_start.c b/plugins/libre_redirect/str_replace_start.c
new file mode 100644
index 0000000..d1fe083
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.c
@@ -0,0 +1,65 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#define DEBUG false
+
+/*
+See also:
+* <https://web.archive.org/web/20160201212501/coding.debuntu.org/c-implementing-str_replace-replace-all-occurrences-substring>
+* https://github.com/irl/la-cucina/blob/master/str_replace.c
+*/
+
+int str_replace_start(const char* string, const char* target, const char* replacement, char* output)
+{
+ int l1 = strlen(string);
+ int l2 = strlen(target);
+ int l3 = strlen(replacement);
+ int l4 = strlen(output);
+ if (DEBUG)
+ printf("%d,%d,%d,%d\n", l1, l2, l3, l4);
+ // if(DEBUG) printf("%s,%s,%s,%s\n", string, target, replacement, output);
+
+ if ((l4 < (l1 - l2 + l3)) || l4 < l1) {
+ // Not enough memory in output string.
+ if (DEBUG)
+ printf("String not long enough.\n");
+ return 1;
+ }
+ /* else if(l1 < l2){
+ // Not even possible that there is a match.
+ if(DEBUG) printf("Target larger than string.\n");
+ strcpy(output, string);
+ } */
+ else {
+ if (DEBUG)
+ printf("Looking for a match for %s in %s.\n", target, string);
+ int match = true;
+ for (int i = 0; i < l2; i++) {
+ if (string[i] != target[i]) {
+ match = false;
+ break;
+ }
+ }
+ if (match) {
+ if (DEBUG)
+ printf("Found match.\n");
+ for (int i = 0; i < l3; i++) {
+ output[i] = replacement[i];
+ }
+ int counter = l3;
+ for (int i = l2; i < l1; i++) {
+ output[counter] = string[i];
+ counter++;
+ }
+ output[counter] = '\0';
+ return 2; // success
+ } else {
+ if (DEBUG)
+ printf("Did not find match.\n");
+ strcpy(output, string);
+ }
+ }
+
+ return 0;
+}
diff --git a/plugins/libre_redirect/str_replace_start.h b/plugins/libre_redirect/str_replace_start.h
new file mode 100644
index 0000000..78c79b5
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.h
@@ -0,0 +1,4 @@
+#pragma once
+
+int str_replace_start(const char* string, const char* target,
+ const char* replacement, char* output);
diff --git a/plugins/libre_redirect/str_replace_test/build-example.sh b/plugins/libre_redirect/str_replace_test/build-example.sh
new file mode 100644
index 0000000..a9f8022
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/build-example.sh
@@ -0,0 +1,11 @@
+#!/bin/bash
+CC=gcc
+
+FLAGS="-std=c99 -Wall -lm"
+
+SRC=example.c
+REQS="../str_replace_start.c ../libre_redirect.c"
+
+echo -e "\n\n\n"
+$CC $FLAGS $SRC $REQS -o example
+
diff --git a/plugins/libre_redirect/str_replace_test/example.c b/plugins/libre_redirect/str_replace_test/example.c
new file mode 100644
index 0000000..b93634a
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/example.c
@@ -0,0 +1,19 @@
+#include "../libre_redirect.h"
+#include <stdio.h>
+#include <string.h>
+
+int main()
+{
+ char uri[] = "https://reddit.com/r/blah";
+
+ int l = LIBRE_N + strlen(uri) + 1;
+ char uri_filtered[l];
+ str_init(uri_filtered, l);
+
+ if (!libre_redirect(uri, uri_filtered)) {
+ printf("Filtered uri: %s\n", uri_filtered);
+ } else {
+ printf("Uri: %s\n", uri);
+ // failure; do something with the original uri.
+ }
+}
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