C library functions - tmpnam ()

C standard library - <stdio.h>

description

C library functionschar * tmpnam (char * str) generates and returns a valid temporary filename, before the file name does not exist.Ifstr is null, then only return to the temporary file name.

statement

Here is () statement tmpnam function.

char *tmpnam(char *str)

parameter

• str - This is a pointer to an array of characters, in which the temporary file name is stored as a C string.

return value

• Pointing to a C string pointer, the string stored in the temporary file name. If str is a null pointer, the pointer to an internal buffer, the buffer is overwritten the next time the function is called.
• If str is not a null pointer, then return str. If the function fails to successfully create the file name is available, it returns a null pointer.

Examples

The following example demonstrates the tmpnam () function is used.

#include <stdio.h>

int main()
{
   char buffer[L_tmpnam];
   char *ptr;


   tmpnam(buffer);
   printf("临时名称 1: %s\n", buffer);
 
   ptr = tmpnam(NULL);
   printf("临时名称 2: %s\n", ptr);

   return(0);
}

Let's compile and run the above program, which will result in the following:

临时名称 1: /tmp/filebaalTb
临时名称 2: /tmp/filedCIbb0

C standard library - <stdio.h>