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-rw-r--r--plugins/libre_redirect/libre_redirect.c69
-rwxr-xr-xplugins/libre_redirect/libre_redirect.h9
-rwxr-xr-xplugins/libre_redirect/str_replace_start.c60
-rwxr-xr-xplugins/libre_redirect/str_replace_start.h6
-rw-r--r--plugins/libre_redirect/str_replace_test/build-example.sh11
-rwxr-xr-xplugins/libre_redirect/str_replace_test/examplebin0 -> 17040 bytes
-rw-r--r--plugins/libre_redirect/str_replace_test/example.c20
7 files changed, 175 insertions, 0 deletions
diff --git a/plugins/libre_redirect/libre_redirect.c b/plugins/libre_redirect/libre_redirect.c
new file mode 100644
index 0000000..b9da2b1
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.c
@@ -0,0 +1,69 @@
+#include "str_replace_start.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#define LIBRE_N 19
+#define DEBUG false
+
+/* 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);
+
+ if((l2 - l1) < LIBRE_N){
+ if(DEBUG) printf("Not enough memory\n");
+ return 1; // not enough memory.
+ }else{
+ char tmp_uri[l2++];
+ char tmp_output[l2++];
+ 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"
+ };
+ int n = sizeof(annoying_sites)/sizeof(annoying_sites[0]);
+ for(int i=0; i<n ; i++){
+ int replace_check = str_replace_start(tmp_uri, annoying_sites[i], alternatives[i], output);
+ if(replace_check == 2){
+ if(DEBUG) printf("tmp_uri: %s\n", tmp_uri);
+ if(DEBUG) printf("output: %s\n", output);
+ // strcpy(output, tmp_uri);
+ // break;
+ return 2;
+ }else if(replace_check == 1){
+ if(DEBUG) printf("replace_check failed\n");
+ return 1;
+ }
+ strcpy(tmp_uri, output);
+ str_init(output, l2);
+ }
+ strcpy(output, tmp_uri);
+ }
+ if(DEBUG) printf("No match found\n\n");
+ return 0;
+
+}
diff --git a/plugins/libre_redirect/libre_redirect.h b/plugins/libre_redirect/libre_redirect.h
new file mode 100755
index 0000000..aee42f4
--- /dev/null
+++ b/plugins/libre_redirect/libre_redirect.h
@@ -0,0 +1,9 @@
+#ifndef LIBRE_REDIRECT
+#define LIBRE_REDIRECT
+
+#define LIBRE_N 19
+
+int libre_redirect(const char* uri, char* uri_filtered);
+void str_init(char* str, int n);
+
+#endif
diff --git a/plugins/libre_redirect/str_replace_start.c b/plugins/libre_redirect/str_replace_start.c
new file mode 100755
index 0000000..74bff65
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.c
@@ -0,0 +1,60 @@
+#include <string.h>
+#include <stdbool.h>
+#include <stdio.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 100755
index 0000000..d9f1235
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_start.h
@@ -0,0 +1,6 @@
+#ifndef STR_REPLACE_H_
+#define STR_REPLACE_H_
+
+int str_replace_start(const char* string, const char* target, const char* replacement, char* output);
+
+#endif
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 b/plugins/libre_redirect/str_replace_test/example
new file mode 100755
index 0000000..4e80ab8
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/example
Binary files differ
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..32285bd
--- /dev/null
+++ b/plugins/libre_redirect/str_replace_test/example.c
@@ -0,0 +1,20 @@
+#include "../libre_redirect.h"
+#include <string.h>
+#include <stdio.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.
+ }
+}
+
+