bs_snprintf.c

wimax bs模拟器

/******************************************************************************* 
**	Copyright (c) 2002,Utstarcom Inc.
**	All rights reserved.
**
**	Group		   : WBG ROM
**	Creater 	   : RCT												  
**	Data		   : 2006-1-15											
**	Description    	   : wrapper function for snprintf and vsnprintf 													 
**	Version 	   : 1.1													  
**-----------------------------------------------------------------------------
** <complement:Update history>
********************************************************************************/
#include "global.h"
#include "xCommon.h"
#include "bs_snprintf.h"
#include "bs_log.h"

#if defined(VXWORKS)
#include <fioLib.h>

/*
 * A container of the following type is allocated from the stack
 * on entry to gw_vsnprintf(), initialized with details about the
 * caller's output buffer, and passed to fioFormatV() for use by
 * bs_sn_output_fn().
 */
typedef struct {
  char *s;        /* The user's output buffer */ 
  int nmax;       /* The length of the user's output buffer */
  int length;     /* The current length of the string in s[] */
} BsPrintData;

static STATUS bs_sn_output_fn(char *buffer, int nc, int arg);


int bs_vsnprintf(char *s, int n, const char *fmt, va_list ap)
{
  BsPrintData data;  /* A container for details about the output buffer */
/*
 * Record details about the output buffer in 'data'. This can
 * then be passed to the fioFormatV() output function.
 */
  data.s = s;
  data.nmax = n;
  data.length = 0;
/*
 * Format output into data.s[] and record the accumulated length
 * of the string in data.length.
 */
  if(fioFormatV(fmt, ap, bs_sn_output_fn, (int) &data) == ERROR)
    return ERROR;
/*
 * Terminate the accumulated string.
 * Note that gw_sn_output_fn() guarantees that data.length is < data.nmax.
 */
  data.s[data.length] = '\0';
/*
 * Return a count of the number of characters in s[], excluding the
 * terminating '\0'. Note that this will be less than the number
 * expected, if the output had to be truncated.
 */
  return data.length;
}

/*.......................................................................
 * This is the function that fioFormatV() calls to render output into
 * the gw_snprintf() caller's output buffer.
 */
static STATUS bs_sn_output_fn(char *buffer, int nc, int arg)
{
  BsPrintData *data = (BsPrintData *) arg;
/*
 * Work out how many of the nc characters in buffer[] can be appended
 * to data->s[]. Leave room for a '\0' terminator at the end of
 * data->s[].
 */
  int nnew = nc;
  if(data->length + nnew + 1 >= data->nmax)
    nnew = data->nmax - data->length - 1;
/*
 * Append nnew characters from buffer[] to data.s[].
 */
  if(nnew > 0) {
    memcpy(data->s + data->length, buffer, nnew);
    data->length += nnew;
  }; return OK;
}
#elif defined(WIN32)


int bs_vsnprintf(char *s, int n, const char *fmt, va_list ap)
{
	return _vsnprintf(s,n,fmt,ap);
}

#else

int bs_vsnprintf(char *s, int n, const char *fmt, va_list ap)
{
	return vsnprintf(s,n,fmt,ap);
}

#endif