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#include "rss.h"
#include "download.h"
#include "buffer.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
static int is_alpha_lowercase(char c) {
return c >= 'a' && c <= 'z';
}
static int is_digit(char c) {
return c >= '0' && c <= '9';
}
static char* get_amp_end(char *str) {
for(;;) {
char c = *str;
if(is_alpha_lowercase(c) || is_digit(c) || c == '#')
++str;
else if(c == ';' || c == '\0')
break;
}
return str;
}
static void xml_unescape(char *str, char *result, int result_length) {
int index = 0;
for(;;) {
char c = *str;
if(c == '&') {
char *amp_end = get_amp_end(str + 1);
char prev_char = *amp_end;
*amp_end = '\0';
if(str[1] == '#') {
result[index++] = atoi(str + 2);
} else {
if(strcmp(str + 1, "amp") == 0)
result[index++] = '&';
else if(strcmp(str + 1, "lt") == 0)
result[index++] = '<';
else if(strcmp(str + 1, "gt") == 0)
result[index++] = '>';
else if(strcmp(str + 1, "apos") == 0)
result[index++] = '\'';
}
*amp_end = prev_char;
str = amp_end;
if(prev_char != '\0')
++str;
} else if(c == '\0') {
result[index] = '\0';
break;
} else {
result[index++] = c;
++str;
}
if(index == result_length - 1) {
result[index] = '\0';
break;
}
}
}
static char* string_substr_before_tag_end(char *str, const char *tag) {
char *tag_p = strstr(str, tag);
if(tag_p)
*tag_p = '\0';
return tag_p;
}
typedef void (*RssParseCallback)(const char *title, const char *link, void *userdata);
static int parse_rss(char *str, char *rss_title_str, int rss_title_str_size, RssParseCallback parse_callback, void *userdata) {
char *channel_start = strstr(str, "<channel>");
if(!channel_start)
return 1;
char *after_channel = channel_start + 9;
char *rss_title = strstr(after_channel, "<title>");
char *first_item = strstr(after_channel, "<item>");
if(!first_item) {
rss_title += 7;
string_substr_before_tag_end(rss_title, "</title>");
xml_unescape(rss_title, rss_title_str, rss_title_str_size);
return 0;
}
if(rss_title < first_item) {
rss_title += 7;
string_substr_before_tag_end(rss_title, "</title>");
xml_unescape(rss_title, rss_title_str, rss_title_str_size);
} else {
rss_title_str[0] = '\0';
}
char title_str[256];
char link_str[2084];
char *item = first_item;
for(;;) {
char *after_first_item = item + 6;
char *item_end = strstr(after_first_item, "</item>");
if(!item_end)
return 1;
char *item_title = strstr(after_first_item, "<title>");
if(!item_title)
return 1;
if(item_title >= item_end)
return 1;
item_title += 7;
char *after_title = string_substr_before_tag_end(item_title, "</title>");
if(!after_title)
return 1;
after_title += 8;
char *item_link = strstr(after_title, "<link>");
if(!item_link)
return 1;
if(item_link >= item_end)
return 1;
item_link += 6;
string_substr_before_tag_end(item_link, "</link>");
xml_unescape(item_title, title_str, sizeof(title_str));
xml_unescape(item_link, link_str, sizeof(link_str));
parse_callback(title_str, link_str, userdata);
item = strstr(item_end + 7, "<item>");
if(!item)
return 0;
}
}
static void rss_parse_callback(const char *title, const char *link, void *userdata) {
(void)userdata;
fprintf(stderr, "title: |%s|, link: |%s|\n", title, link);
}
int add_rss(const char *name, const char *url, const char *rss_config_dir, const char *start_after) {
(void)name;
(void)rss_config_dir;
(void)start_after;
int result = 0;
Buffer buffer;
buffer_init(&buffer);
int res = download_to_buffer(url, &buffer);
if(res != 0) {
fprintf(stderr, "Failed to download rss: %s\n", url);
result = res;
goto cleanup;
}
char rss_title[256];
res = parse_rss(buffer.data, rss_title, sizeof(rss_title), rss_parse_callback, NULL);
if(res != 0) {
fprintf(stderr, "Failed to parse rss for url: %s\n", url);
result = res;
goto cleanup;
}
fprintf(stderr, "rss title: |%s|\n", rss_title);
cleanup:
buffer_deinit(&buffer);
return result;
}
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