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1 nishi 1 
/* $Id: util.c 11 2024-08-21 04:31:55Z nishi $ */
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#include "rv_util.h"
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#include "../config.h"
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#include "rv_version.h"
5 nishi 8 
#include "rv_db.h"
1 nishi 9 
 
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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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3 nishi 14 
char* rv_strcat(const char* a, const char* b) {
1 nishi 15 
	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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3 nishi 22 
char* rv_strcat3(const char* a, const char* b, const char* c) {
1 nishi 23 
	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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3 nishi 29 
char* rv_strdup(const char* str) { return rv_strcat(str, ""); }
1 nishi 30 
 
3 nishi 31 
void rv_error_http(void) {
1 nishi 32 
	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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3 nishi 42 
int hex_to_num(char c) {
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	if('0' <= c && c <= '9') {
1 nishi 44 
		return c - '0';
3 nishi 45 
	} else if('a' <= c && c <= 'f') {
1 nishi 46 
		return c - 'a' + 10;
3 nishi 47 
	} else if('A' <= c && c <= 'F') {
1 nishi 48 
		return c - 'A' + 10;
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	}
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	return 0;
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}
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3 nishi 53 
char* rv_url_decode(const char* str) {
1 nishi 54 
	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;
3 nishi 59 
	for(i = 0; str[i] != 0; i++) {
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		if(str[i] == '%') {
1 nishi 61 
			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;
3 nishi 68 
		} else {
1 nishi 69 
			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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}
5 nishi 77 
 
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char* rv_new_token(const char* username) {
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	const char tokenstr[] = "0123456789abcdefghijklmnopqrstuvwxyz";
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	char* token = malloc(17);
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	token[16] = 0;
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	int i;
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regenerate:
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	for(i = 0; i < 16; i++) {
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		token[i] = tokenstr[rand() % strlen(tokenstr)];
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	}
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	if(rv_has_token(token)) goto regenerate;
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	rv_save_token(username, token);
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	return token;
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}