global string gets corrupted
Hi
I am currently working on a program, that parses a shoutcast stream and gives back some information. i declared three global variables (2 char pointers (stationinfo and station) and one int (metaint)).
all three variables give back exactly what i want in the size_t stream_process and the size_t hdrprocess, that is the stationname, songtitle and the metaint value.
but when i try to get access to the variables in my int main the strings are corrupted and printf for example shows some weird stuff, or nothing. :(
the integer is fine, it keeps its value.
Code:
#include <stdio.h>
#include <curl/curl.h>
#include <string.h>
#include <stdlib.h>
int metaint;
static char *station;
static char *stationinfo;
/* Function to get the song title parsed */
size_t stream_process(void *buffer, size_t size, size_t nmemb, void *userp) {
int loop;
char *metadata, *token;
for (loop=0;loop<=nmemb*size;loop++){
metadata = ((buffer)+loop);
/* the trick with counting the bytes till bytes = metaint
* never really worked out....or I never really figured it out ;)
* so we just search for the string 'StreamTitle'
* and then we parse the Title into our info-variable
* might be more cpu-intense, but it actually works! */
if (!strncmp(metadata, "StreamTitle", 11)){
char data[256];
strncpy(data, metadata+12, 256);
token = strtok(data, "'");
stationinfo = (char *) token;
printf("%s\n", stationinfo);
}
}
return size*nmemb;
}
/* headerprocessing: */
size_t hdrprocess( void *ptr, size_t size, size_t nmemb, void *stream){
int loop=0;
char *data, *token, info[100];
data = (char *) ptr;
if(!strncmp(data, "icy-name:", 9)) {
printf("Got Servername!\n");
token = strtok(data, " ");
while((token = strtok(0, " "))){
if(loop == 0) {
strcpy(info, token);
loop++;
} else {
strcat (info, " ");
strcat (info, token);
}
}
station = (char *)info;
printf("Servername: %s\n", station);
}
if(!strncmp(data, "icy-metaint:", 12)) {
printf("Got metaint-data!\n");
token = strtok(data, " ");
token = strtok(0, " ");
if (token) {
metaint = atoi(token);
} else {
metaint = 0;
}
printf("metaint = %i\n", metaint);
}
return size*nmemb; /* we must return the amount of bytes processed */
}
int main (int argc, char **argv){
char *easyhandle;
char *headerdata;
char *URL;
struct curl_slist *headerlist=NULL;
if(argc<2){
printf("\n\nUSAGE:\n\n");
printf("%s [URL]\n\n", argv[0]);
return 0;
}
URL = argv[1];
/* CURL initialization*/
curl_global_init(CURL_GLOBAL_ALL);
easyhandle = curl_easy_init();
/* append 'Icy-MetaData:1' to the header, bc we want the metadata*/
headerlist = curl_slist_append(headerlist, "Icy-MetaData:1");
headerlist = curl_slist_append(headerlist, "ICY 200 OK");
curl_easy_setopt(easyhandle, CURLOPT_HTTPHEADER, headerlist);
/* Where are we connecting to?*/
curl_easy_setopt(easyhandle, CURLOPT_URL, URL);
curl_easy_setopt(easyhandle, CURLOPT_TIMEOUT, 2);
curl_easy_setopt(easyhandle, CURLOPT_HTTP200ALIASES, headerlist);
curl_easy_setopt(easyhandle, CURLOPT_HEADERFUNCTION, hdrprocess);
curl_easy_setopt(easyhandle, CURLOPT_WRITEHEADER, headerdata);
/* Don't send data recieved to stdout --> send to processing-function instead*/
curl_easy_setopt(easyhandle, CURLOPT_WRITEFUNCTION, stream_process);
curl_easy_perform(easyhandle);
/*where are the actual values of my variables? */
printf("%s\n", station); /*outputs some crap*/
printf("%s\n", stationinfo);/*here too*/
printf("%i\n", metaint); /*everything fine here*/
curl_slist_free_all(headerlist); /* free the list again */
curl_global_cleanup();
return 0;
}
thx in advance
PS i know this is probably really sloppy work, but i am far from a pro and needed something that fitted my needs, but couldn't find it.
PPS i am developing under linux and cygwin
