1 /* $OpenBSD: safe_sprintf.c,v 1.5 2010/01/12 23:22:06 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright (c) 1998-2003,2007 Free Software Foundation, Inc. * 5 * * 6 * Permission is hereby granted, free of charge, to any person obtaining a * 7 * copy of this software and associated documentation files (the * 8 * "Software"), to deal in the Software without restriction, including * 9 * without limitation the rights to use, copy, modify, merge, publish, * 10 * distribute, distribute with modifications, sublicense, and/or sell * 11 * copies of the Software, and to permit persons to whom the Software is * 12 * furnished to do so, subject to the following conditions: * 13 * * 14 * The above copyright notice and this permission notice shall be included * 15 * in all copies or substantial portions of the Software. * 16 * * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 20 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 21 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 22 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 23 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 24 * * 25 * Except as contained in this notice, the name(s) of the above copyright * 26 * holders shall not be used in advertising or otherwise to promote the * 27 * sale, use or other dealings in this Software without prior written * 28 * authorization. * 29 ****************************************************************************/ 30 31 /**************************************************************************** 32 * Author: Thomas E. Dickey <dickey@clark.net> 1997 * 33 ****************************************************************************/ 34 35 #include <curses.priv.h> 36 #include <ctype.h> 37 38 MODULE_ID("$Id: safe_sprintf.c,v 1.5 2010/01/12 23:22:06 nicm Exp $") 39 40 #if USE_SAFE_SPRINTF 41 42 typedef enum { 43 Flags, Width, Prec, Type, Format 44 } PRINTF; 45 46 #define VA_INTGR(type) ival = va_arg(ap, type) 47 #define VA_FLOAT(type) fval = va_arg(ap, type) 48 #define VA_POINT(type) pval = (void *)va_arg(ap, type) 49 50 /* 51 * Scan a variable-argument list for printf to determine the number of 52 * characters that would be emitted. 53 */ 54 static int 55 _nc_printf_length(const char *fmt, va_list ap) 56 { 57 size_t length = BUFSIZ; 58 char *buffer; 59 char *format; 60 int len = 0; 61 size_t fmt_len; 62 char fmt_arg[BUFSIZ]; 63 64 if (fmt == 0 || *fmt == '\0') 65 return 0; 66 fmt_len = strlen(fmt) + 1; 67 if ((format = typeMalloc(char, fmt_len)) == 0) 68 return -1; 69 if ((buffer = typeMalloc(char, length)) == 0) { 70 free(format); 71 return -1; 72 } 73 74 while (*fmt != '\0') { 75 if (*fmt == '%') { 76 static char dummy[] = ""; 77 PRINTF state = Flags; 78 char *pval = dummy; /* avoid const-cast */ 79 double fval = 0.0; 80 int done = FALSE; 81 int ival = 0; 82 int prec = -1; 83 int type = 0; 84 int used = 0; 85 int width = -1; 86 size_t f = 0; 87 88 format[f++] = *fmt; 89 while (*++fmt != '\0' && len >= 0 && !done) { 90 format[f++] = *fmt; 91 92 if (isdigit(UChar(*fmt))) { 93 int num = *fmt - '0'; 94 if (state == Flags && num != 0) 95 state = Width; 96 if (state == Width) { 97 if (width < 0) 98 width = 0; 99 width = (width * 10) + num; 100 } else if (state == Prec) { 101 if (prec < 0) 102 prec = 0; 103 prec = (prec * 10) + num; 104 } 105 } else if (*fmt == '*') { 106 VA_INTGR(int); 107 if (state == Flags) 108 state = Width; 109 if (state == Width) { 110 width = ival; 111 } else if (state == Prec) { 112 prec = ival; 113 } 114 sprintf(fmt_arg, "%d", ival); 115 fmt_len += strlen(fmt_arg); 116 if ((format = realloc(format, fmt_len)) == 0) { 117 return -1; 118 } 119 strcpy(&format[--f], fmt_arg); 120 f = strlen(format); 121 } else if (isalpha(UChar(*fmt))) { 122 done = TRUE; 123 switch (*fmt) { 124 case 'Z': /* FALLTHRU */ 125 case 'h': /* FALLTHRU */ 126 case 'l': /* FALLTHRU */ 127 done = FALSE; 128 type = *fmt; 129 break; 130 case 'i': /* FALLTHRU */ 131 case 'd': /* FALLTHRU */ 132 case 'u': /* FALLTHRU */ 133 case 'x': /* FALLTHRU */ 134 case 'X': /* FALLTHRU */ 135 if (type == 'l') 136 VA_INTGR(long); 137 else if (type == 'Z') 138 VA_INTGR(size_t); 139 else 140 VA_INTGR(int); 141 used = 'i'; 142 break; 143 case 'f': /* FALLTHRU */ 144 case 'e': /* FALLTHRU */ 145 case 'E': /* FALLTHRU */ 146 case 'g': /* FALLTHRU */ 147 case 'G': /* FALLTHRU */ 148 VA_FLOAT(double); 149 used = 'f'; 150 break; 151 case 'c': 152 VA_INTGR(int); 153 used = 'i'; 154 break; 155 case 's': 156 VA_POINT(char *); 157 if (prec < 0) 158 prec = strlen(pval); 159 if (prec > (int) length) { 160 length = length + prec; 161 buffer = typeRealloc(char, length, buffer); 162 if (buffer == 0) { 163 free(format); 164 return -1; 165 } 166 } 167 used = 'p'; 168 break; 169 case 'p': 170 VA_POINT(void *); 171 used = 'p'; 172 break; 173 case 'n': 174 VA_POINT(int *); 175 used = 0; 176 break; 177 default: 178 break; 179 } 180 } else if (*fmt == '.') { 181 state = Prec; 182 } else if (*fmt == '%') { 183 done = TRUE; 184 used = 'p'; 185 } 186 } 187 format[f] = '\0'; 188 switch (used) { 189 case 'i': 190 sprintf(buffer, format, ival); 191 break; 192 case 'f': 193 sprintf(buffer, format, fval); 194 break; 195 default: 196 sprintf(buffer, format, pval); 197 break; 198 } 199 len += (int) strlen(buffer); 200 } else { 201 fmt++; 202 len++; 203 } 204 } 205 206 free(buffer); 207 free(format); 208 return len; 209 } 210 #endif 211 212 #define my_buffer _nc_globals.safeprint_buf 213 #define my_length _nc_globals.safeprint_used 214 215 /* 216 * Wrapper for vsprintf that allocates a buffer big enough to hold the result. 217 */ 218 NCURSES_EXPORT(char *) 219 _nc_printf_string(const char *fmt, va_list ap) 220 { 221 char *result = 0; 222 223 if (fmt != 0) { 224 #if USE_SAFE_SPRINTF 225 int len = _nc_printf_length(fmt, ap); 226 227 if ((int) my_length < len + 1) { 228 my_length = 2 * (len + 1); 229 my_buffer = typeRealloc(char, my_length, my_buffer); 230 } 231 if (my_buffer != 0) { 232 *my_buffer = '\0'; 233 if (len >= 0) { 234 vsprintf(my_buffer, fmt, ap); 235 } 236 result = my_buffer; 237 } 238 #else 239 #define MyCols _nc_globals.safeprint_cols 240 #define MyRows _nc_globals.safeprint_rows 241 242 if (screen_lines > MyRows || screen_columns > MyCols) { 243 if (screen_lines > MyRows) 244 MyRows = screen_lines; 245 if (screen_columns > MyCols) 246 MyCols = screen_columns; 247 my_length = (MyRows * (MyCols + 1)) + 1; 248 my_buffer = typeRealloc(char, my_length, my_buffer); 249 } 250 251 if (my_buffer != 0) { 252 # if HAVE_VSNPRINTF 253 vsnprintf(my_buffer, my_length, fmt, ap); /* GNU extension */ 254 # else 255 vsprintf(my_buffer, fmt, ap); /* ANSI */ 256 # endif 257 result = my_buffer; 258 } 259 #endif 260 } else if (my_buffer != 0) { /* see _nc_freeall() */ 261 free(my_buffer); 262 my_buffer = 0; 263 my_length = 0; 264 } 265 return result; 266 } 267