fusl/src/temp/mkostemps.c

#define _BSD_SOURCE
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "libc.h"

char* __randname(char*);

int __mkostemps(char* template, int len, int flags) {
  size_t l = strlen(template);
  if (l < 6 || len > l - 6 || memcmp(template + l - len - 6, "XXXXXX", 6)) {
    errno = EINVAL;
    return -1;
  }

  flags -= flags & O_ACCMODE;
  int fd, retries = 100;
  do {
    __randname(template + l - len - 6);
    if ((fd = open(template, flags | O_RDWR | O_CREAT | O_EXCL, 0600)) >= 0)
      return fd;
  } while (--retries && errno == EEXIST);

  memcpy(template + l - len - 6, "XXXXXX", 6);
  return -1;
}

weak_alias(__mkostemps, mkostemps);
weak_alias(__mkostemps, mkostemps64);