#define __USE_GNU

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>

#define OUIFile "/usr/local/share/wireshark/manuf"

FILE *ouiFile;
unsigned long ouiFSize;

void main(int argc, char *argv[]){
    if (argc < 2 || argc > 2){
        printf("\nUsage: %s <MAC ADDRESS>\n\n",argv[0]);
        exit(1);
    }
    if ( access("./manuf", F_OK) != -1){
        printf("USING ./manuf\n");
        ouiFile=fopen("./manuf","r");
    }
    else if ( access(OUIFile, F_OK) != -1){
        printf("USING OUIFile\n");
        ouiFile=fopen(OUIFile,"r");
    }
    else {
        printf("File not found D:\n");
        exit(1);
    }


    fseek(ouiFile, 0, SEEK_END);
    ouiFSize = ftell(ouiFile);
    rewind(ouiFile);
    printf("File Size: %li\n",ouiFSize);

    char fileBuf[ouiFSize];
    fread(fileBuf,1,ouiFSize,ouiFile);
    fileBuf[ouiFSize] = 0;//Get rid of the EOF

    char *match = strcasestr(fileBuf,argv[1]);
    if ( match != NULL ){
        char *end = strpbrk(match, "\n");
        char *ouiOut = malloc(128);
        strncpy(ouiOut, match, end - match);
        printf("\n\n%s\n",ouiOut);
    }
    else {
        printf("No match found :(\n");
    }


//char *ouiOut; Why dosent that work?
// you also need to add a check for full MAC and Only the OUI (lowercase only), mabey add a probability and best match scenarios also
}