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#include <stdio.h>#include <string.h>#include <stdlib.h>parse_config(const char *filename){  char buffer[4096];  char * line = NULL;  FILE * file = fopen(filename, "r");  if (file == NULL) {    perror(filename);    exit(1);  }  for (line = fgets(buffer, 4096, file); line != NULL; line = fgets(buffer, 4096, file)) {    // skip spaces and read the key    line += strspn(line, " \t");    char * key = strsep(&line, " \t=");    if (line == NULL) continue;    // skip spaces and read the value    line += strspn(line, " \t=");    char * value = strsep(&line, " \t\n");    if (line == NULL) continue;    printf("k = %s and v = %s\n", key, value);  }  fclose(file);}void usage(const char * cmd){  printf("Usage: %s <config file>\n", cmd);  exit(1);}int main(int argc, char **argv){  if (argc != 2)    usage(argv[0]);  parse_config(argv[1]);  return 0;}