/************************************************************** * $Id: snprintf.c,v 1.2 2003/04/19 18:58:12 al-guest Exp $ * Original: * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 * A bombproof version of doprnt (dopr) included. * Sigh.  This sort of thing is always nasty do deal with.  Note that * the version here does not include floating point... * * snprintf() is used instead of sprintf() as it does limit checks * for string length.  This covers a nasty loophole. * * The other functions are there to prevent NULL pointers from * causing nast effects. **************************************************************//* $XFree86: xc/lib/misc/snprintf.c,v 3.0 1996/08/26 06:19:23 dawes Exp $ */#ifdef HAVE_CONFIG_H# include <config.h>#endif#include "../src/rcsid.h"RCSID("$Id: snprintf.c,v 1.2 2003/04/19 18:58:12 al-guest Exp $")#include <ctype.h>#include <sys/types.h>#include <strings.h>static void dopr();static char *end;/* varargs declarations: */#if defined(HAVE_STDARG_H)# include <stdarg.h># define HAVE_STDARGS    /* let's hope that works everywhere (mj) */# define VA_LOCAL_DECL   va_list ap;# define VA_START(f)     va_start(ap, f)# define VA_SHIFT(v,t)  ;   /* no-op for ANSI */# define VA_END          va_end(ap)#else# if defined(HAVE_VARARGS_H)#  include <varargs.h>#  undef HAVE_STDARGS#  define VA_LOCAL_DECL   va_list ap;#  define VA_START(f)     va_start(ap)      /* f is ignored! */#  define VA_SHIFT(v,t) v = va_arg(ap,t)#  define VA_END        va_end(ap)# else/*XX ** NO VARARGS ** XX*/# endif#endif#ifdef HAVE_STDARGSint snprintf (char *str, size_t count, const char *fmt, ...);int vsnprintf (char *str, size_t count, const char *fmt, va_list arg);#elseint snprintf ();int vsnprintf ();#endifintvsnprintf(str, count, fmt, args)       char *str;       size_t count;       const char *fmt;       va_list args;{       str[0] = 0;       end = str+count-1;       dopr( str, fmt, args );       if( count>0 ){               end[0] = 0;       }       return(strlen(str));}/* VARARGS3 */#ifdef HAVE_STDARGSintsnprintf (char *str,size_t count,const char *fmt,...)#elseintsnprintf (va_alist) va_dcl#endif{#ifndef HAVE_STDARGS    char *str;       size_t count;    char *fmt;#endif    VA_LOCAL_DECL    VA_START (fmt);    VA_SHIFT (str, char *);    VA_SHIFT (count, size_t );    VA_SHIFT (fmt, char *);    (void) vsnprintf ( str, count, fmt, ap);    VA_END;       return( strlen( str ) );}/* * dopr(): poor man's version of doprintf */static void fmtstr(#if NeedFunctionPrototypes	char *value, int ljust, int len, int zpad#endif);static void fmtnum(#if NeedFunctionPrototypes	long value, int base, int dosign, int ljust, int len, int zpad#endif);static void dostr(#if NeedFunctionPrototypes	char *#endif);static char *output;static void dopr_outch(#if NeedFunctionPrototypes	int c#endif);static voiddopr( buffer, format, args )       char *buffer;       char *format;       va_list args;{       int ch;       long value;       int longflag = 0;       char *strvalue;       int ljust;       int len;       int zpad;       output = buffer;       while( (ch = *format++) ){               switch( ch ){               case '%':                       ljust = len = zpad = 0;               nextch:                       ch = *format++;                       switch( ch ){                       case 0:                               dostr( "**end of format**" );                               return;                       case '-': ljust = 1; goto nextch;                       case '0': /* set zero padding if len not set */                               if(len==0) zpad = '0';                       case '1': case '2': case '3':                       case '4': case '5': case '6':                       case '7': case '8': case '9':                               len = len*10 + ch - '0';                               goto nextch;                       case 'l': longflag = 1; goto nextch;                       case 'u': case 'U':                               /*fmtnum(value,base,dosign,ljust,len,zpad) */                               if( longflag ){                                       value = va_arg( args, long );                               } else {                                       value = va_arg( args, int );                               }                               fmtnum( value, 10,0, ljust, len, zpad ); break;                       case 'o': case 'O':                               /*fmtnum(value,base,dosign,ljust,len,zpad) */                               if( longflag ){                                       value = va_arg( args, long );                               } else {                                       value = va_arg( args, int );                               }                               fmtnum( value, 8,0, ljust, len, zpad ); break;                       case 'd': case 'D':                               if( longflag ){                                       value = va_arg( args, long );                               } else {                                       value = va_arg( args, int );                               }                               fmtnum( value, 10,1, ljust, len, zpad ); break;                       case 'x':                               if( longflag ){                                       value = va_arg( args, long );                               } else {                                       value = va_arg( args, int );                               }                               fmtnum( value, 16,0, ljust, len, zpad ); break;                       case 'X':                               if( longflag ){                                       value = va_arg( args, long );                               } else {                                       value = va_arg( args, int );                               }                               fmtnum( value,-16,0, ljust, len, zpad ); break;                       case 's':                               strvalue = va_arg( args, char *);                               fmtstr( strvalue,ljust,len,zpad ); break;                       case 'c':                               ch = va_arg( args, int );                               dopr_outch( ch ); break;                       case '%': dopr_outch( ch ); continue;                       default:                               dostr(  "???????" );                       }                       longflag = 0;                       break;               default:                       dopr_outch( ch );                       break;               }       }       *output = 0;}static voidfmtstr(  value, ljust, len, zpad )       char *value;       int ljust, len, zpad;{       int padlen, strlen;     /* amount to pad */       if( value == 0 ){               value = "<NULL>";       }       for( strlen = 0; value[strlen]; ++ strlen ); /* strlen */       padlen = len - strlen;       if( padlen < 0 ) padlen = 0;       if( ljust ) padlen = -padlen;       while( padlen > 0 ) {               dopr_outch( ' ' );               --padlen;       }       dostr( value );       while( padlen < 0 ) {               dopr_outch( ' ' );               ++padlen;       }}static voidfmtnum(  value, base, dosign, ljust, len, zpad )       long value;       int base, dosign, ljust, len, zpad;{       int signvalue = 0;       unsigned long uvalue;       char convert[20];       int place = 0;       int padlen = 0; /* amount to pad */       int caps = 0;       /* DEBUGP(("value 0x%x, base %d, dosign %d, ljust %d, len %d, zpad %d\n",               value, base, dosign, ljust, len, zpad )); */       uvalue = value;       if( dosign ){               if( value < 0 ) {                       signvalue = '-';                       uvalue = -value;               }       }       if( base < 0 ){               caps = 1;               base = -base;       }       do{               convert[place++] =                       (caps? "0123456789ABCDEF":"0123456789abcdef")                        [uvalue % (unsigned)base  ];               uvalue = (uvalue / (unsigned)base );       }while(uvalue);       convert[place] = 0;       padlen = len - place;       if( padlen < 0 ) padlen = 0;       if( ljust ) padlen = -padlen;       /* DEBUGP(( "str '%s', place %d, sign %c, padlen %d\n",               convert,place,signvalue,padlen)); */       if( zpad && padlen > 0 ){               if( signvalue ){                       dopr_outch( signvalue );                       --padlen;                       signvalue = 0;               }               while( padlen > 0 ){                       dopr_outch( zpad );                       --padlen;               }       }       while( padlen > 0 ) {               dopr_outch( ' ' );               --padlen;       }       if( signvalue ) dopr_outch( signvalue );       while( place > 0 ) dopr_outch( convert[--place] );       while( padlen < 0 ){               dopr_outch( ' ' );               ++padlen;       }}static voiddostr( str )       char *str;{       while(*str) dopr_outch(*str++);}static voiddopr_outch( c )       int c;{       if( iscntrl(c) && c != '\n' && c != '\t' ){               c = '@' + (c & 0x1F);               if( end == 0 || output < end ){                       *output++ = '^';               }       }       if( end == 0 || output < end ){               *output++ = c;       }}