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notmem()             General Function (libc)             notmem()




Check if memory is allocated

iinntt nnoottmmeemm(_p_t_r);
cchhaarr *_p_t_r;

notmem checks  if a  memory block  has been allocated  by calloc,
malloc, or realloc.  ptr points to the block to be checked.

notmem searches the arena for ptr.   It returns one if ptr is not
a memory block obtained from malloc, calloc, or realloc, and zero
if it is.

***** Example *****

The following  example prints  a string, and  frees it if  it was
malloc'd.


#include <sys/malloc.h>



pfree(s)
char *s;
{
        printf("%s\n", s);
        if(!notmem(s))
                free(s);
}



main()
{
        char *mallocked_string;
        char notmallocked_string[50];



        if ((mallocked_string = malloc(50)) == NULL)
                exit(1);



        strcpy(mallocked_string, "This is a malloc'd string");
        strcpy(notmallocked_string, "This is not a malloc'd string");



        pfree(mallocked_string);
        pfree(notmallocked_string);
}




COHERENT Lexicon                                           Page 1




notmem()             General Function (libc)             notmem()




***** See Also *****

arena, calloc(), free(),  general functions, malloc(), realloc(),
setbuf()




















































COHERENT Lexicon                                           Page 2

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