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Current File : /var/www/html/siac/croce/admin/components/htmldoc-master/htmldoc/snprintf.c

/*
 * (v)snprintf functions for HTMLDOC.
 *
 * Copyright 2011 by Michael R Sweet.
 * Copyright 1997-2010 by Easy Software Products.  All rights reserved.
 *
 * This program is free software.  Distribution and use rights are outlined in
 * the file "COPYING".
 */

/*
 * Include necessary headers...
 */

#include "hdstring.h"


#ifndef HAVE_VSNPRINTF
/*
 * 'hd_vsnprintf()' - Format a string into a fixed size buffer.
 */

int					/* O - Number of bytes formatted */
hd_vsnprintf(char       *buffer,	/* O - Output buffer */
             size_t     bufsize,	/* O - Size of output buffer */
 	     const char *format,	/* I - printf-style format string */
 	     va_list    ap)		/* I - Pointer to additional arguments */
{
  char		*bufptr,		/* Pointer to position in buffer */
		*bufend,		/* Pointer to end of buffer */
		sign,			/* Sign of format width */
		size,			/* Size character (h, l, L) */
		type;			/* Format type character */
  const char	*bufformat;		/* Start of format */
  int		width,			/* Width of field */
		prec;			/* Number of characters of precision */
  char		tformat[100],		/* Temporary format string for sprintf() */
		temp[1024];		/* Buffer for formatted numbers */
  char		*s;			/* Pointer to string */
  int		slen;			/* Length of string */
  int		bytes;			/* Total number of bytes needed */


 /*
  * Loop through the format string, formatting as needed...
  */

  bufptr = buffer;
  bufend = buffer + bufsize - 1;
  bytes  = 0;

  while (*format)
  {
    if (*format == '%')
    {
      bufformat = format;
      format ++;

      if (*format == '%')
      {
        *bufptr++ = *format++;
	continue;
      }
      else if (strchr(" -+#\'", *format))
        sign = *format++;
      else
        sign = 0;

      width = 0;
      while (isdigit(*format))
        width = width * 10 + *format++ - '0';

      if (*format == '.')
      {
        format ++;
	prec = 0;

	while (isdigit(*format))
          prec = prec * 10 + *format++ - '0';
      }
      else
        prec = -1;

      if (*format == 'l' && format[1] == 'l')
      {
        size = 'L';
	format += 2;
      }
      else if (*format == 'h' || *format == 'l' || *format == 'L')
        size = *format++;

      if (!*format)
        break;

      type = *format++;

      switch (type)
      {
	case 'E' : /* Floating point formats */
	case 'G' :
	case 'e' :
	case 'f' :
	case 'g' :
	    if ((format - bufformat + 1) > sizeof(tformat) ||
	        (width + 2) > sizeof(temp))
	      break;

	    strncpy(tformat, bufformat, format - bufformat);
	    tformat[format - bufformat] = '\0';

	    sprintf(temp, tformat, va_arg(ap, double));

            bytes += strlen(temp);

            if (bufptr)
	    {
	      if ((bufptr + strlen(temp)) > bufend)
	      {
		strncpy(bufptr, temp, bufend - bufptr);
		bufptr = bufend;
		break;
	      }
	      else
	      {
		strcpy(bufptr, temp);
		bufptr += strlen(temp);
	      }
	    }
	    break;

        case 'B' : /* Integer formats */
	case 'X' :
	case 'b' :
        case 'd' :
	case 'i' :
	case 'o' :
	case 'u' :
	case 'x' :
	    if ((format - bufformat + 1) > sizeof(tformat) ||
	        (width + 2) > sizeof(temp))
	      break;

	    strncpy(tformat, bufformat, format - bufformat);
	    tformat[format - bufformat] = '\0';

	    sprintf(temp, tformat, va_arg(ap, int));

            bytes += strlen(temp);

	    if (bufptr)
	    {
	      if ((bufptr + strlen(temp)) > bufend)
	      {
		strncpy(bufptr, temp, bufend - bufptr);
		bufptr = bufend;
		break;
	      }
	      else
	      {
		strcpy(bufptr, temp);
		bufptr += strlen(temp);
	      }
	    }
	    break;

	case 'p' : /* Pointer value */
	    if ((format - bufformat + 1) > sizeof(tformat) ||
	        (width + 2) > sizeof(temp))
	      break;

	    strncpy(tformat, bufformat, format - bufformat);
	    tformat[format - bufformat] = '\0';

	    sprintf(temp, tformat, va_arg(ap, void *));

            bytes += strlen(temp);

	    if (bufptr)
	    {
	      if ((bufptr + strlen(temp)) > bufend)
	      {
		strncpy(bufptr, temp, bufend - bufptr);
		bufptr = bufend;
		break;
	      }
	      else
	      {
		strcpy(bufptr, temp);
		bufptr += strlen(temp);
	      }
	    }
	    break;

        case 'c' : /* Character or character array */
	    bytes += width;

	    if (bufptr)
	    {
	      if (width <= 1)
		*bufptr++ = va_arg(ap, int);
	      else
	      {
		if ((bufptr + width) > bufend)
	          width = bufend - bufptr;

		memcpy(bufptr, va_arg(ap, char *), width);
		bufptr += width;
	      }
	    }
	    break;

	case 's' : /* String */
	    if ((s = va_arg(ap, char *)) == NULL)
	      s = "(null)";

	    slen = strlen(s);
	    if (slen > width && prec != width)
	      width = slen;

            bytes += width;

	    if (bufptr)
	    {
	      if ((bufptr + width) > bufend)
		width = bufend - bufptr;

              if (slen > width)
		slen = width;

	      if (sign == '-')
	      {
		strncpy(bufptr, s, slen);
		memset(bufptr + slen, ' ', width - slen);
	      }
	      else
	      {
		memset(bufptr, ' ', width - slen);
		strncpy(bufptr + width - slen, s, slen);
	      }

	      bufptr += width;
	    }
	    break;

	case 'n' : /* Output number of chars so far */
	    if ((format - bufformat + 1) > sizeof(tformat) ||
	        (width + 2) > sizeof(temp))
	      break;

	    strncpy(tformat, bufformat, format - bufformat);
	    tformat[format - bufformat] = '\0';

	    sprintf(temp, tformat, va_arg(ap, int));

            bytes += strlen(temp);

	    if (bufptr)
	    {
	      if ((bufptr + strlen(temp)) > bufend)
	      {
		strncpy(bufptr, temp, bufend - bufptr);
		bufptr = bufend;
		break;
	      }
	      else
	      {
		strcpy(bufptr, temp);
		bufptr += strlen(temp);
	      }
	    }
	    break;
      }
    }
    else
    {
      bytes ++;

      if (bufptr && bufptr < bufend)
	*bufptr++ = *format++;
    }
  }

 /*
  * Nul-terminate the string and return the number of characters needed.
  */

  *bufptr = '\0';

  return (bytes);
}
#endif /* !HAVE_VSNPRINT */


#ifndef HAVE_SNPRINTF
/*
 * 'hd_snprintf()' - Format a string into a fixed size buffer.
 */

int					/* O - Number of bytes formatted */
hd_snprintf(char       *buffer,		/* O - Output buffer */
            size_t     bufsize,		/* O - Size of output buffer */
            const char *format,		/* I - printf-style format string */
	    ...)			/* I - Additional arguments as needed */
{
  int		bytes;			/* Number of bytes formatted */
  va_list 	ap;			/* Pointer to additional arguments */


  va_start(ap, format);
  bytes = vsnprintf(buffer, bufsize, format, ap);
  va_end(ap);

  return (bytes);
}
#endif /* !HAVE_SNPRINTF */

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