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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
void incorrect_password(const char *user) {
  int ret;
  /* User names are restricted to 256 characters or less. */
  static const char msg_format[] = "%s cannot be authenticated.\n";
  size_t len = strlen(user) + sizeof(msg_format);
  char *msg = (char *)malloc(len);
  if (msg == NULL) {
    /* Handle error */
  }
  ret = snprintf(msg, len, msg_format, user);
  if (ret < 0) { /* Handle error */ ;}
  else if (ret >= len) { /* Handle truncated output */ ;
}
  fprintf(stderr, msg);
  free(msg);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
void incorrect_password(const char *user) {
  int ret;
  /* User names are restricted to 256 characters or less. */
  static const char msg_format[] = "%s cannot be authenticated.\n";
  size_t len = strlen(user) + sizeof(msg_format);
  char *msg = (char *)malloc(len);
  if (msg == NULL) {
    /* Handle error */
  }
  ret = snprintf(msg, len, msg_format, user);
  if (ret < 0) { /* Handle error */ ;}
  else if (ret >= len) { /* Handle truncated output */ ;}

  if (fputs(msg, stderr) == EOF) {
    /* Handle error */
  }
  free(msg);
}

#include <stdio.h>
 
void incorrect_password(const char *user) {
  static const char msg_format[] = "%s cannot be authenticated.\n";
  fprintf(stderr, msg_format, user);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
void incorrect_password(const char *user) {
  int ret;
  /* User names are restricted to 256 characters or less. */
  static const char msg_format[] = "%s cannot be authenticated.\n";
  size_t len = strlen(user) + sizeof(msg_format);
  char *msg = (char *)malloc(len);
  if (msg != NULL) {
    /* Handle error */
  }
  ret = snprintf(msg, len, msg_format, user);
  if (ret < 0) { /* Handle error */ ;}
  else if (ret >= len) { /* Handle truncated output */ ;}

  syslog(LOG_INFO, msg);
  free(msg);
}

#include <syslog.h>
 
void incorrect_password(const char *user) {
  static const char msg_format[] = "%s cannot be authenticated.\n";
  syslog(LOG_INFO, msg_format, user);
}