#include "lib.h"

PUBLIC int errno;		/* place where error numbers go */

PUBLIC int callm1(proc, syscallnr, int1, int2, int3, ptr1, ptr2, ptr3)
int proc;			/* FS or MM */
int syscallnr;			/* which system call */
int int1;			/* first integer parameter */
int int2;			/* second integer parameter */
int int3;			/* third integer parameter */
char *ptr1;			/* pointer parameter */
char *ptr2;			/* pointer parameter */
char *ptr3;			/* pointer parameter */
{
/* Send a message and get the response.  The 'M.m_type' field of the
 * reply contains a value (>= 0) or an error code (<0). Use message format m1.
 */
  M.m1_i1 = int1;
  M.m1_i2 = int2;
  M.m1_i3 = int3;
  M.m1_p1 = ptr1;
  M.m1_p2 = ptr2;
  M.m1_p3 = ptr3;
  return callx(proc, syscallnr);
}





PUBLIC int callm3(proc, syscallnr, int1, name)
int proc;			/* FS or MM */
int syscallnr;			/* which system call */
int int1;			/* integer parameter */
char *name;			/* string */
{
/* This form of system call is used for those calls that contain at most
 * one integer parameter along with a string.  If the string fits in the
 * message, it is copied there.  If not, a pointer to it is passed.
 */
  register int k;
  register char *rp;
  k = len(name);
  M.m3_i1 = k;
  M.m3_i2 = int1;
  M.m3_p1 = name;
  rp = &M.m3_ca1[0];
  if (k <= M3_STRING) while (k--) *rp++ = *name++;
  return callx(proc, syscallnr);
}





PUBLIC int callx(proc, syscallnr)
int proc;			/* FS or MM */
int syscallnr;			/* which system call */
{
/* Send a message and get the response.  The 'M.m_type' field of the
 * reply contains a value (>= 0) or an error code (<0). 
 */
  int k;

  M.m_type = syscallnr;
  k = sendrec(proc, &M);
  if (k != OK) return(k);	/* send itself failed */
  if (M.m_type < 0) {errno = -M.m_type; return(-1);}
  return(M.m_type);
}





PUBLIC int len(s)
register char *s;		/* character string whose length is needed */
{
/* Return the length of a character string, including the 0 at the end. */
  register int k;

  k = 0;
  while (*s++ != 0) k++;
  return(k+1);			/* return length including the 0-byte at end */
}