// SPDX-License-Identifier: Apache-2.0
/***********************************************************
**********************************************************
* Fast URL Encoder - Closely conforms to RFC 3986
*
* Takes piped in uri's similar to jq but is quicker and conforms
* more to RFC 3986 [diverges w/most browsers on #'s].
*
* Handles multibyte unicode characters
*
* Copyright (C) 2024 Victrixsoft
*
* Issues: If you find any issues please open a ticket on github!
* https://github.com/victrixsoft/vx_urlenc/issues
*
* Author: Adam Danischewski <my first nm(dot)my last nm@gmail.com>
*
**********************************************************
***********************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _WIN32
#include <io.h>
#define access _access
#else
#include <unistd.h>
#endif
#define ASCII_SIZE 128
char *url_encode(const char *);
void init_lookup_table(void);
int fileno(FILE *);
void __attribute__((constructor)) init(void);
char lookup_table[ASCII_SIZE] = {0};
void init_lookup_table(void) {
for (int i = 'a'; i <= 'z'; i++)
lookup_table[i] = 1;
for (int i = 'A'; i <= 'Z'; i++)
lookup_table[i] = 1;
for (int i = '0'; i <= '9'; i++)
lookup_table[i] = 1;
const char *safe = "-_.:/!~*@$&[]+=,;?";
while (*safe)
lookup_table[(unsigned char)*safe++] = 1;
}
void __attribute__((constructor)) init() { init_lookup_table(); }
char *url_encode(const char *str) {
if (str == NULL)
return NULL;
char *encoded =
malloc(strlen(str) * 4 * 3 + 1); // Worst case: every char 4 byte mb
if (encoded == NULL)
return NULL;
char *penc = encoded;
size_t output_idx = 0;
while (*str && *str != '\n') { // Stop at newline
if (lookup_table[(unsigned char)*str]) {
*penc++ = *str;
output_idx++;
} else {
sprintf(penc, "%%%02X", (unsigned char)*str);
penc += 3;
output_idx += 3;
}
str++;
}
*penc = '\0';
char *resized_enc = realloc(encoded, output_idx + 1);
if (resized_enc == NULL) {
return encoded;
} else {
return resized_enc;
}
}
int main(int argc, char *argv[]) {
(void)argc;
(void)argv;
if (isatty(fileno(stdin))) {
perror("It's not a pipe\n");
return 1;
}
char strbuf[65536];
while (fgets(strbuf, sizeof strbuf, stdin) != NULL) {
char *encoded = url_encode(strbuf);
if (encoded) {
printf("%s\n", encoded);
free(encoded);
} else {
fprintf(stderr, "Error encoding line\n");
}
}
return 0;
}
Compile: gcc -o vx_urlenc vx_urlenc.c
Usage: echo 'http://www.gaggle.com/🐀🐁🐂🐃🐄🐅🐆🐇🐈🐉🐊🐋🐌🐍!!![]*?#@.mp4' | ./vx_urlenc
https://github.com/victrixsoft/vx_urlenc
