contrib/ncurses-5.4/ncurses/base/safe_sprintf.c

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  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 1.18 2003/08/09 21:52:04 tom Exp $")
  37
  38 #if USE_SAFE_SPRINTF
  39
  40 typedef enum {
  41     Flags, Width, Prec, Type, Format
  42 } PRINTF;
  43
  44 #define VA_INTGR(type) ival = va_arg(ap, type)
  45 #define VA_FLOAT(type) fval = va_arg(ap, type)
  46 #define VA_POINT(type) pval = (void *)va_arg(ap, type)
  47
  48 /*
  49  * Scan a variable-argument list for printf to determine the number of
  50  * characters that would be emitted.
  51  */
  52 static int
  53 _nc_printf_length(const char *fmt, va_list ap)
  54 {
  55     size_t length = BUFSIZ;
  56     char *buffer;
  57     char *format;
  58     int len = 0;
  59     size_t fmt_len;
  60     char fmt_arg[BUFSIZ];
  61
  62     if (fmt == 0 || *fmt == '\0')
  63         return 0;
  64     fmt_len = strlen(fmt) + 1;
  65     if ((format = typeMalloc(char, fmt_len)) == 0)
  66           return -1;
  67     if ((buffer = typeMalloc(char, length)) == 0) {
  68         free(format);
  69         return -1;
  70     }
  71
  72     while (*fmt != '\0') {
  73         if (*fmt == '%') {
  74             static char dummy[] = "";
  75             PRINTF state = Flags;
  76             char *pval = dummy; /* avoid const-cast */
  77             double fval = 0.0;
  78             int done = FALSE;
  79             int ival = 0;
  80             int prec = -1;
  81             int type = 0;
  82             int used = 0;
  83             int width = -1;
  84             size_t f = 0;
  85
  86             format[f++] = *fmt;
  87             while (*++fmt != '\0' && len >= 0 && !done) {
  88                 format[f++] = *fmt;
  89
  90                 if (isdigit(UChar(*fmt))) {
  91                     int num = *fmt - '0';
  92                     if (state == Flags && num != 0)
  93                         state = Width;
  94                     if (state == Width) {
  95                         if (width < 0)
  96                             width = 0;
  97                         width = (width * 10) + num;
  98                     } else if (state == Prec) {
  99                         if (prec < 0)
 100                             prec = 0;
 101                         prec = (prec * 10) + num;
 102                     }
 103                 } else if (*fmt == '*') {
 104                     VA_INTGR(int);
 105                     if (state == Flags)
 106                         state = Width;
 107                     if (state == Width) {
 108                         width = ival;
 109                     } else if (state == Prec) {
 110                         prec = ival;
 111                     }
 112                     sprintf(fmt_arg, "%d", ival);
 113                     fmt_len += strlen(fmt_arg);
 114                     if ((format = realloc(format, fmt_len)) == 0) {
 115                         return -1;
 116                     }
 117                     strcpy(&format[--f], fmt_arg);
 118                     f = strlen(format);
 119                 } else if (isalpha(UChar(*fmt))) {
 120                     done = TRUE;
 121                     switch (*fmt) {
 122                     case 'Z':   /* FALLTHRU */
 123                     case 'h':   /* FALLTHRU */
 124                     case 'l':   /* FALLTHRU */
 125                         done = FALSE;
 126                         type = *fmt;
 127                         break;
 128                     case 'i':   /* FALLTHRU */
 129                     case 'd':   /* FALLTHRU */
 130                     case 'u':   /* FALLTHRU */
 131                     case 'x':   /* FALLTHRU */
 132                     case 'X':   /* FALLTHRU */
 133                         if (type == 'l')
 134                             VA_INTGR(long);
 135                         else if (type == 'Z')
 136                             VA_INTGR(size_t);
 137                         else
 138                             VA_INTGR(int);
 139                         used = 'i';
 140                         break;
 141                     case 'f':   /* FALLTHRU */
 142                     case 'e':   /* FALLTHRU */
 143                     case 'E':   /* FALLTHRU */
 144                     case 'g':   /* FALLTHRU */
 145                     case 'G':   /* FALLTHRU */
 146                         VA_FLOAT(double);
 147                         used = 'f';
 148                         break;
 149                     case 'c':
 150                         VA_INTGR(int);
 151                         used = 'i';
 152                         break;
 153                     case 's':
 154                         VA_POINT(char *);
 155                         if (prec < 0)
 156                             prec = strlen(pval);
 157                         if (prec > (int) length) {
 158                             length = length + prec;
 159                             buffer = typeRealloc(char, length, buffer);
 160                             if (buffer == 0) {
 161                                 free(format);
 162                                 return -1;
 163                             }
 164                         }
 165                         used = 'p';
 166                         break;
 167                     case 'p':
 168                         VA_POINT(void *);
 169                         used = 'p';
 170                         break;
 171                     case 'n':
 172                         VA_POINT(int *);
 173                         used = 0;
 174                         break;
 175                     default:
 176                         break;
 177                     }
 178                 } else if (*fmt == '.') {
 179                     state = Prec;
 180                 } else if (*fmt == '%') {
 181                     done = TRUE;
 182                     used = 'p';
 183                 }
 184             }
 185             format[f] = '\0';
 186             switch (used) {
 187             case 'i':
 188                 sprintf(buffer, format, ival);
 189                 break;
 190             case 'f':
 191                 sprintf(buffer, format, fval);
 192                 break;
 193             default:
 194                 sprintf(buffer, format, pval);
 195                 break;
 196             }
 197             len += (int) strlen(buffer);
 198         } else {
 199             fmt++;
 200             len++;
 201         }
 202     }
 203
 204     free(buffer);
 205     free(format);
 206     return len;
 207 }
 208 #endif
 209
 210 /*
 211  * Wrapper for vsprintf that allocates a buffer big enough to hold the result.
 212  */
 213 NCURSES_EXPORT(char *)
 214 _nc_printf_string(const char *fmt, va_list ap)
 215 {
 216     static char *buf;
 217     static size_t used;
 218     char *result = 0;
 219
 220     if (fmt != 0) {
 221 #if USE_SAFE_SPRINTF
 222         int len = _nc_printf_length(fmt, ap);
 223
 224         if ((int) used < len + 1) {
 225             used = 2 * (len + 1);
 226             buf = typeRealloc(char, used, buf);
 227         }
 228         if (buf != 0) {
 229             *buf = '\0';
 230             if (len >= 0) {
 231                 vsprintf(buf, fmt, ap);
 232             }
 233             result = buf;
 234         }
 235 #else
 236         static int rows, cols;
 237
 238         if (screen_lines > rows || screen_columns > cols) {
 239             if (screen_lines > rows)
 240                 rows = screen_lines;
 241             if (screen_columns > cols)
 242                 cols = screen_columns;
 243             used = (rows * (cols + 1)) + 1;
 244             buf = typeRealloc(char, used, buf);
 245         }
 246
 247         if (buf != 0) {
 248 # if HAVE_VSNPRINTF
 249             vsnprintf(buf, used, fmt, ap);      /* GNU extension */
 250 # else
 251             vsprintf(buf, fmt, ap);     /* ANSI */
 252 # endif
 253             result = buf;
 254         }
 255 #endif
 256     } else if (buf != 0) {      /* see _nc_freeall() */
 257         free(buf);
 258         buf = 0;
 259         used = 0;
 260     }
 261     return result;
 262 }