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Synopsis:
    #include <malloc.h>
    size_t stackavail(void);

Description:
    The stackavail function returns the number of bytes currently available
    in the stack.  This value is usually used to determine an appropriate
    amount to allocate using alloca.

Returns:
    The stackavail function returns the number of bytes currently available
    in the stack.

Example:
    #include <stdio.h>
    #include <string.h>
    #include <malloc.h>
    #include <fcntl.h>
    #include <io.h>

    long char_count( FILE *fp )
      {
         char *buffer;
         size_t bufsiz;
         long count;

         /* allocate half of stack for temp buffer */
         bufsiz = stackavail() >> 1;
         buffer = (char *) alloca( bufsiz );
         setvbuf( fp, buffer, _IOFBF, bufsiz );
         count = 0L;
         while( fgetc( fp ) != EOF ) ++count;
         fclose( fp );
         return( count );
      }

    void main()
      {
        FILE *fp;

        fp = fopen( "file", "rb" );
        if( fp != NULL ) {
          setmode( fileno( fp ), O_BINARY );
          printf( "File contains %lu characters\n",
              char_count( fp ) );
          fclose( fp );
        }
      }

Classification:
    WATCOM

Systems:
    All, Netware

See Also:
    alloca, calloc Functions, malloc Functions