Change the NSS and NSPR source tree to the new directory structure to be

mozilla/security/nss/lib/base/error.c

-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifdef DEBUG
-static const char CVS_ID[] = "@(#) $RCSfile: error.c,v $ $Revision: 1.10 $ $Date: 2012/04/25 14:49:26 $";
-#endif /* DEBUG */
-
-/*
- * error.c
- *
- * This file contains the code implementing the per-thread error 
- * stacks upon which most NSS routines report their errors.
- */
-
-#ifndef BASE_H
-#include "base.h"
-#endif /* BASE_H */
-#include <limits.h> /* for UINT_MAX */
-#include <string.h> /* for memmove */
-
-#define NSS_MAX_ERROR_STACK_COUNT 16 /* error codes */
-
-/*
- * The stack itself has a header, and a sequence of integers.
- * The header records the amount of space (as measured in stack
- * slots) already allocated for the stack, and the count of the
- * number of records currently being used.
- */
-
-struct stack_header_str {
-  PRUint16 space;
-  PRUint16 count;
-};
-
-struct error_stack_str {
-  struct stack_header_str header;
-  PRInt32 stack[1];
-};
-typedef struct error_stack_str error_stack;
-
-/*
- * error_stack_index
- *
- * Thread-private data must be indexed.  This is that index.
- * See PR_NewThreadPrivateIndex for more information.
- *
- * Thread-private data indexes are in the range [0, 127].
- */
-
-#define INVALID_TPD_INDEX UINT_MAX
-static PRUintn error_stack_index = INVALID_TPD_INDEX;
-
-/*
- * call_once
- *
- * The thread-private index must be obtained (once!) at runtime.
- * This block is used for that one-time call.
- */
-
-static PRCallOnceType error_call_once;
-
-/*
- * error_once_function
- *
- * This is the once-called callback.
- */
-static PRStatus
-error_once_function ( void)
-{
-  return PR_NewThreadPrivateIndex(&error_stack_index, PR_Free);
-}
-
-/*
- * error_get_my_stack
- *
- * This routine returns the calling thread's error stack, creating
- * it if necessary.  It may return NULL upon error, which implicitly
- * means that it ran out of memory.
- */
-
-static error_stack *
-error_get_my_stack ( void)
-{
-  PRStatus st;
-  error_stack *rv;
-  PRUintn new_size;
-  PRUint32 new_bytes;
-  error_stack *new_stack;
-
-  if( INVALID_TPD_INDEX == error_stack_index ) {
-    st = PR_CallOnce(&error_call_once, error_once_function);
-    if( PR_SUCCESS != st ) {
-      return (error_stack *)NULL;
-    }
-  }
-
-  rv = (error_stack *)PR_GetThreadPrivate(error_stack_index);
-  if( (error_stack *)NULL == rv ) {
-    /* Doesn't exist; create one */
-    new_size = 16;
-  } else if( rv->header.count == rv->header.space  &&
-             rv->header.count  < NSS_MAX_ERROR_STACK_COUNT ) {
-    /* Too small, expand it */
-    new_size = PR_MIN( rv->header.space * 2, NSS_MAX_ERROR_STACK_COUNT);
-  } else {
-    /* Okay, return it */
-    return rv;
-  }
-
-  new_bytes = (new_size * sizeof(PRInt32)) + sizeof(error_stack);
-  /* Use NSPR's calloc/realloc, not NSS's, to avoid loops! */
-  new_stack = PR_Calloc(1, new_bytes);
-  
-  if( (error_stack *)NULL != new_stack ) {
-    if( (error_stack *)NULL != rv ) {
-        (void)nsslibc_memcpy(new_stack,rv,rv->header.space);
-    }
-    new_stack->header.space = new_size;
-  }
-
-  /* Set the value, whether or not the allocation worked */
-  PR_SetThreadPrivate(error_stack_index, new_stack);
-  return new_stack;
-}
-
-/*
- * The error stack
- *
- * The public methods relating to the error stack are:
- *
- *  NSS_GetError
- *  NSS_GetErrorStack
- *
- * The nonpublic methods relating to the error stack are:
- *
- *  nss_SetError
- *  nss_ClearErrorStack
- *
- */
-
-/*
- * NSS_GetError
- *
- * This routine returns the highest-level (most general) error set
- * by the most recent NSS library routine called by the same thread
- * calling this routine.
- *
- * This routine cannot fail.  However, it may return zero, which
- * indicates that the previous NSS library call did not set an error.
- *
- * Return value:
- *  0 if no error has been set
- *  A nonzero error number
- */
-
-NSS_IMPLEMENT PRInt32
-NSS_GetError ( void)
-{
-  error_stack *es = error_get_my_stack();
-
-  if( (error_stack *)NULL == es ) {
-    return NSS_ERROR_NO_MEMORY; /* Good guess! */
-  }
-
-  if( 0 == es->header.count ) {
-    return 0;
-  }
-
-  return es->stack[ es->header.count-1 ];
-}
-
-/*
- * NSS_GetErrorStack
- *
- * This routine returns a pointer to an array of integers, containing
- * the entire sequence or "stack" of errors set by the most recent NSS
- * library routine called by the same thread calling this routine.
- * NOTE: the caller DOES NOT OWN the memory pointed to by the return
- * value.  The pointer will remain valid until the calling thread
- * calls another NSS routine.  The lowest-level (most specific) error 
- * is first in the array, and the highest-level is last.  The array is
- * zero-terminated.  This routine may return NULL upon error; this
- * indicates a low-memory situation.
- *
- * Return value:
- *  NULL upon error, which is an implied NSS_ERROR_NO_MEMORY
- *  A NON-caller-owned pointer to an array of integers
- */
-
-NSS_IMPLEMENT PRInt32 *
-NSS_GetErrorStack ( void)
-{
-  error_stack *es = error_get_my_stack();
-
-  if( (error_stack *)NULL == es ) {
-    return (PRInt32 *)NULL;
-  }
-
-  /* Make sure it's terminated */
-  es->stack[ es->header.count ] = 0;
-
-  return es->stack;
-}
-
-/*
- * nss_SetError
- *
- * This routine places a new error code on the top of the calling 
- * thread's error stack.  Calling this routine wiht an error code
- * of zero will clear the error stack.
- */
-
-NSS_IMPLEMENT void
-nss_SetError ( PRUint32 error)
-{
-  error_stack *es;
-
-  if( 0 == error ) {
-    nss_ClearErrorStack();
-    return;
-  }
-
-  es = error_get_my_stack();
-  if( (error_stack *)NULL == es ) {
-    /* Oh, well. */
-    return;
-  }
-
-  if (es->header.count < es->header.space) {
-    es->stack[ es->header.count++ ] = error;
-  } else {
-    memmove(es->stack, es->stack + 1, 
-                (es->header.space - 1) * (sizeof es->stack[0]));
-    es->stack[ es->header.space - 1 ] = error;
-  }
-  return;
-}
-
-/*
- * nss_ClearErrorStack
- *
- * This routine clears the calling thread's error stack.
- */
-
-NSS_IMPLEMENT void
-nss_ClearErrorStack ( void)
-{
-  error_stack *es = error_get_my_stack();
-  if( (error_stack *)NULL == es ) {
-    /* Oh, well. */
-    return;
-  }
-
-  es->header.count = 0;
-  es->stack[0] = 0;
-  return;
-}
-
-/*
- * nss_DestroyErrorStack
- *
- * This routine frees the calling thread's error stack.
- */
-
-NSS_IMPLEMENT void
-nss_DestroyErrorStack ( void)
-{
-  if( INVALID_TPD_INDEX != error_stack_index ) {
-    PR_SetThreadPrivate(error_stack_index, NULL);
-  }
-  return;
-}