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1 nishi 1 
/* $Id: util.c 1 2024-08-20 19:18:25Z nishi $ */
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#include "rv_util.h"
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#include "../config.h"
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#include "rv_version.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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char* rv_strcat(const char* a, const char* b){
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	char* str = malloc(strlen(a) + strlen(b) + 1);
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	memcpy(str, a, strlen(a));
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	memcpy(str + strlen(a), b, strlen(b));
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	str[strlen(a) + strlen(b)] = 0;
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	return str;
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}
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char* rv_strcat3(const char* a, const char* b, const char* c){
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	char* tmp = rv_strcat(a, b);
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	char* str = rv_strcat(tmp, c);
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	free(tmp);
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	return str;
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}
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char* rv_strdup(const char* str){
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	return rv_strcat(str, "");
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}
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void rv_error_http(void){
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	printf("Content-Type: text/plain\r\n");
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	printf("Status: 500 Internal Server Error\r\n");
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	printf("\r\n");
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	printf("This is RepoView version %s, named `%s`.\n", rv_get_version(), INSTANCE_NAME);
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	printf("Unrecoverable error has occured.\n");
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	printf("Admin contact: %s\n", INSTANCE_ADMIN);
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	printf("Developer contact: Nishi <nishi@nishi.boats>\n");
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	printf("-----\n");
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}
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int hex_to_num(char c){
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	if('0' <= c && c <= '9'){
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		return c - '0';
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	}else if('a' <= c && c <= 'f'){
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		return c - 'a' + 10;
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	}else if('A' <= c && c <= 'F'){
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		return c - 'A' + 10;
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	}
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	return 0;
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}
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char* rv_url_decode(const char* str){
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	char* r = malloc(1);
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	r[0] = 0;
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	int i;
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	char cbuf[2];
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	cbuf[1] = 0;
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	for(i = 0; str[i] != 0; i++){
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		if(str[i] == '%'){
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			if(str[i + 1] == 0) break;
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			if(str[i + 2] == 0) break;
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			cbuf[0] = (hex_to_num(str[i + 1]) << 4) | hex_to_num(str[i + 2]);
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			char* tmp = r;
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			r = rv_strcat(tmp, cbuf);
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			free(tmp);
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			i += 2;
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		}else{
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			cbuf[0] = str[i];
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			char* tmp = r;
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			r = rv_strcat(tmp, cbuf);
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			free(tmp);
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		}
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	}
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	return r;
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}