#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <errno.h>

char *parse_string(char *in, char *name, char *out);
char name[100], freq[100], id[100];
int getline(char **, size_t *, FILE *);

int main(int argc, char *argv[]) {
  FILE *file = 0;
  char *buffer = malloc(1024);
  int size = 0;

  if ((file = fopen("/proc/cpuinfo", "r")) == NULL) {
    fprintf(stderr, "%s: /proc/cpuinfo: %s\n", argv[0], strerror(errno));
    exit(1);
  }

  while(getline(&buffer, &size, file) && !feof(file)) {
    parse_string(buffer, "model name", name);
    parse_string(buffer, "cpu mhz", freq);
    parse_string(buffer, "vendor_id", id);
  }

  fclose(file);

  printf("Your processor is a %s %s (%s)\n", freq, name, id);

  return 0;
}

char *parse_string(char *in, char *name, char *out) {
  int i, j = 0;
  char *str = malloc(1024);

  while (1)
    if (in[j] == ' ' || in[j] == '\t') j++;
    else break;

  if (in[j] == '#') return 0;
  in += j;

  for (i=0; i<strlen(name); i++)
    if (tolower(name[i]) != tolower(in[i])) return 0;

  strcpy(str, strstr(in, ":"));
  j = 0;

  while (1)
    if (str[j] == ':' || str[j] == ' ' || str[j] == '\t') j++;

    else break;

  str += j;
  if (str[strlen(str)-1] == '\n') str[strlen(str)-1] = 0;

  strcpy(out, str);
  return str;
}