/* @deftypefn Supplemental char* tmpnam (char *@var{s}) This function attempts to create a name for a temporary file, which will be a valid file name yet not exist when @code{tmpnam} checks for it. @var{s} must point to a buffer of at least @code{L_tmpnam} bytes, or be @code{NULL}. Use of this function creates a security risk, and it must not be used in new projects. Use @code{mkstemp} instead. @end deftypefn */ #include <stdio.h> #ifndef L_tmpnam #define L_tmpnam 100 #endif #ifndef P_tmpdir #define P_tmpdir "/usr/tmp" #endif static char tmpnam_buffer[L_tmpnam]; static int tmpnam_counter; extern int getpid (void); char * tmpnam (char *s) { int pid = getpid (); if (s == NULL) s = tmpnam_buffer; /* Generate the filename and make sure that there isn't one called it already. */ while (1) { FILE *f; sprintf (s, "%s/%s%x.%x", P_tmpdir, "t", pid, tmpnam_counter); f = fopen (s, "r"); if (f == NULL) break; tmpnam_counter++; fclose (f); } return s; }