MAC vendor lookup: Difference between revisions
Added C implementation.
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Outputs:<pre>Dell Inc.</pre>
=={{header|C}}==
Takes MAC address as input, prints usage on incorrect invocation, requires [https://curl.haxx.se/libcurl/ libcurl]
<lang C>
/*Abhishek Ghosh, 18th October 2017*/
#include <curl/curl.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
/* Length of http://api.macvendors.com/ */
#define FIXED_LENGTH 16
struct MemoryStruct {
char *memory;
size_t size;
};
static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp)
{
size_t realsize = size * nmemb;
struct MemoryStruct *mem = (struct MemoryStruct *)userp;
mem->memory = realloc(mem->memory, mem->size + realsize + 1);
memcpy(&(mem->memory[mem->size]), contents, realsize);
mem->size += realsize;
mem->memory[mem->size] = 0;
return realsize;
}
void checkResponse(char* str){
char ref[] = "Vendor not found";
int len = strlen(str),flag = 1,i;
if(len<16)
fputs(str,stdout);
else{
for(i=0;i<len && i<16;i++)
flag = flag && (ref[i]==str[i]);
flag==1?fputs("N/A",stdout):fputs(str,stdout);
}
}
int main(int argC,char* argV[])
{
if(argC!=2)
printf("Usage : %s <MAC address>",argV[0]);
else{
CURL *curl;
int len = strlen(argV[1]);
char* str = (char*)malloc((FIXED_LENGTH + len)*sizeof(char));
struct MemoryStruct chunk;
CURLcode res;
chunk.memory = malloc(1);
chunk.size = 0;
if ((curl = curl_easy_init()) != NULL) {
sprintf(str,"http://api.macvendors.com/%s",argV[1]);
curl_easy_setopt(curl, CURLOPT_URL, str);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&chunk);
free(str);
res = curl_easy_perform(curl);
if (res == CURLE_OK) {
checkResponse(chunk.memory);
return EXIT_SUCCESS;
}
curl_easy_cleanup(curl);
}
}
return EXIT_FAILURE;
}
</lang>
Invocation and output :
<pre>
C:\rosettaCode>macLookUp 00-11-22-33-44-55-66
CIMSYS Inc
C:\rosettaCode>macLookUp 10-11-22-33-44-55-66
N/A
</pre>
=={{header|C sharp|C#}}==
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