ncurses/safe_sprintf.c

   1 /****************************************************************************
   2  * Copyright (c) 1998 Free Software Foundation, Inc.                        *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
   5  * copy of this software and associated documentation files (the            *
   6  * "Software"), to deal in the Software without restriction, including      *
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   8  * distribute, distribute with modifications, sublicense, and/or sell       *
   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Thomas E. Dickey <dickey@clark.net> 1997                        *
  31  ****************************************************************************/
  32
  33 #include <curses.priv.h>
  34 #include <ctype.h>
  35
  36 MODULE_ID("$Id: safe_sprintf.c,v 1.5 1998/02/11 12:13:57 tom Exp $")
  37
  38 #if USE_SAFE_SPRINTF
  39
  40 typedef enum { Flags, Width, Prec, Type, Format } PRINTF;
  41
  42 #define VA_INTGR(type) ival = va_arg(ap, type)
  43 #define VA_FLOAT(type) fval = va_arg(ap, type)
  44 #define VA_POINT(type) pval = (void *)va_arg(ap, type)
  45
  46 /*
  47  * Scan a variable-argument list for printf to determine the number of
  48  * characters that would be emitted.
  49  */
  50 static int
  51 _nc_printf_length(const char *fmt, va_list ap)
  52 {
  53         size_t length = BUFSIZ;
  54         char *buffer;
  55         char *format;
  56         int len = 0;
  57
  58         if (fmt == 0 || *fmt == '\0')
  59                 return -1;
  60         if ((format = malloc(strlen(fmt)+1)) == 0)
  61                 return -1;
  62         if ((buffer = malloc(length)) == 0) {
  63                 free(format);
  64                 return -1;
  65         }
  66
  67         while (*fmt != '\0') {
  68                 if (*fmt == '%') {
  69                         PRINTF state = Flags;
  70                         char *pval   = "";
  71                         double fval  = 0.0;
  72                         int done     = FALSE;
  73                         int ival     = 0;
  74                         int prec     = -1;
  75                         int type     = 0;
  76                         int used     = 0;
  77                         int width    = -1;
  78                         size_t f     = 0;
  79
  80                         format[f++] = *fmt;
  81                         while (*++fmt != '\0' && len >= 0 && !done) {
  82                                 format[f++] = *fmt;
  83
  84                                 if (isdigit(*fmt)) {
  85                                         int num = *fmt - '0';
  86                                         if (state == Flags && num != 0)
  87                                                 state = Width;
  88                                         if (state == Width) {
  89                                                 if (width < 0)
  90                                                         width = 0;
  91                                                 width = (width * 10) + num;
  92                                         } else if (state == Prec) {
  93                                                 if (prec < 0)
  94                                                         prec = 0;
  95                                                 prec = (prec * 10) + num;
  96                                         }
  97                                 } else if (*fmt == '*') {
  98                                         VA_INTGR(int);
  99                                         if (state == Flags)
 100                                                 state = Width;
 101                                         if (state == Width) {
 102                                                 width = ival;
 103                                         } else if (state == Prec) {
 104                                                 prec = ival;
 105                                         }
 106                                         sprintf(&format[--f], "%d", ival);
 107                                         f = strlen(format);
 108                                 } else if (isalpha(*fmt)) {
 109                                         done = TRUE;
 110                                         switch (*fmt) {
 111                                         case 'Z': /* FALLTHRU */
 112                                         case 'h': /* FALLTHRU */
 113                                         case 'l': /* FALLTHRU */
 114                                         case 'L': /* FALLTHRU */
 115                                                 done = FALSE;
 116                                                 type = *fmt;
 117                                                 break;
 118                                         case 'i': /* FALLTHRU */
 119                                         case 'd': /* FALLTHRU */
 120                                         case 'u': /* FALLTHRU */
 121                                         case 'x': /* FALLTHRU */
 122                                         case 'X': /* FALLTHRU */
 123                                                 if (type == 'l')
 124                                                         VA_INTGR(long);
 125                                                 else if (type == 'Z')
 126                                                         VA_INTGR(size_t);
 127                                                 else
 128                                                         VA_INTGR(int);
 129                                                 used = 'i';
 130                                                 break;
 131                                         case 'f': /* FALLTHRU */
 132                                         case 'e': /* FALLTHRU */
 133                                         case 'E': /* FALLTHRU */
 134                                         case 'g': /* FALLTHRU */
 135                                         case 'G': /* FALLTHRU */
 136                                                 if (type == 'L')
 137                                                         VA_FLOAT(long double);
 138                                                 else
 139                                                         VA_FLOAT(double);
 140                                                 used = 'f';
 141                                                 break;
 142                                         case 'c':
 143                                                 VA_INTGR(int);
 144                                                 used = 'i';
 145                                                 break;
 146                                         case 's':
 147                                                 VA_POINT(char *);
 148                                                 if (prec < 0)
 149                                                         prec = strlen(pval);
 150                                                 if (prec > (int)length) {
 151                                                         length = length + prec;
 152                                                         buffer = realloc(buffer, length);
 153                                                         if (buffer == 0) {
 154                                                                 free(format);
 155                                                                 return -1;
 156                                                         }
 157                                                 }
 158                                                 used = 'p';
 159                                                 break;
 160                                         case 'p':
 161                                                 VA_POINT(void *);
 162                                                 used = 'p';
 163                                                 break;
 164                                         case 'n':
 165                                                 VA_POINT(int *);
 166                                                 used = 0;
 167                                                 break;
 168                                         default:
 169                                                 break;
 170                                         }
 171                                 } else if (*fmt == '.') {
 172                                         state = Prec;
 173                                 } else if (*fmt == '%') {
 174                                         done = TRUE;
 175                                         used = 'p';
 176                                 }
 177                         }
 178                         format[f] = '\0';
 179                         switch (used) {
 180                         case 'i':
 181                                 sprintf(buffer, format, ival);
 182                                 break;
 183                         case 'f':
 184                                 sprintf(buffer, format, fval);
 185                                 break;
 186                         default:
 187                                 sprintf(buffer, format, pval);
 188                                 break;
 189                         }
 190                         len += (int)strlen(buffer);
 191                 } else {
 192                         fmt++;
 193                         len++;
 194                 }
 195         }
 196
 197         free(buffer);
 198         free(format);
 199         return len;
 200 }
 201 #endif
 202
 203 /*
 204  * Wrapper for vsprintf that allocates a buffer big enough to hold the result.
 205  */
 206 char *
 207 _nc_printf_string(const char *fmt, va_list ap)
 208 {
 209 #if USE_SAFE_SPRINTF
 210         char *buf = 0;
 211         int len = _nc_printf_length(fmt, ap);
 212
 213         if (len > 0) {
 214                 buf = malloc(len+1);
 215                 vsprintf(buf, fmt, ap);
 216         }
 217 #else
 218         static int rows, cols;
 219         static char *buf;
 220         static size_t len;
 221
 222         if (screen_lines > rows || screen_columns > cols) {
 223                 if (screen_lines   > rows) rows = screen_lines;
 224                 if (screen_columns > cols) cols = screen_columns;
 225                 len = (rows * (cols + 1)) + 1;
 226                 if (buf == 0)
 227                         buf = malloc(len);
 228                 else
 229                         buf = realloc(buf, len);
 230         }
 231
 232         if (buf != 0) {
 233 # if HAVE_VSNPRINTF
 234                 vsnprintf(buf, len, fmt, ap);   /* GNU extension */
 235 # else
 236                 vsprintf(buf, fmt, ap);         /* ANSI */
 237 # endif
 238 #endif
 239         }
 240         return buf;
 241 }