1 /**************************************************************************** 2 * Copyright (c) 1998-2009,2010 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 * 7 * without limitation the rights to use, copy, modify, merge, publish, * 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 * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 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 1.24 2010/06/05 22:22:27 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 = _nc_doalloc(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 #define my_buffer _nc_globals.safeprint_buf 211 #define my_length _nc_globals.safeprint_used 212 213 /* 214 * Wrapper for vsprintf that allocates a buffer big enough to hold the result. 215 */ 216 NCURSES_EXPORT(char *) 217 NCURSES_SP_NAME(_nc_printf_string) (NCURSES_SP_DCLx 218 const char *fmt, 219 va_list ap) 220 { 221 char *result = 0; 222 223 if (fmt != 0) { 224 #if USE_SAFE_SPRINTF 225 va_list ap2; 226 int len; 227 228 begin_va_copy(ap2, ap); 229 len = _nc_printf_length(fmt, ap2); 230 end_va_copy(ap2); 231 232 if ((int) my_length < len + 1) { 233 my_length = 2 * (len + 1); 234 my_buffer = typeRealloc(char, my_length, my_buffer); 235 } 236 if (my_buffer != 0) { 237 *my_buffer = '\0'; 238 if (len >= 0) { 239 vsprintf(my_buffer, fmt, ap); 240 } 241 result = my_buffer; 242 } 243 #else 244 #define MyCols _nc_globals.safeprint_cols 245 #define MyRows _nc_globals.safeprint_rows 246 247 if (screen_lines(SP_PARM) > MyRows || screen_columns(SP_PARM) > MyCols) { 248 if (screen_lines(SP_PARM) > MyRows) 249 MyRows = screen_lines(SP_PARM); 250 if (screen_columns(SP_PARM) > MyCols) 251 MyCols = screen_columns(SP_PARM); 252 my_length = (size_t) (MyRows * (MyCols + 1)) + 1; 253 my_buffer = typeRealloc(char, my_length, my_buffer); 254 } 255 256 if (my_buffer != 0) { 257 # if HAVE_VSNPRINTF 258 vsnprintf(my_buffer, my_length, fmt, ap); /* GNU extension */ 259 # else 260 vsprintf(my_buffer, fmt, ap); /* ANSI */ 261 # endif 262 result = my_buffer; 263 } 264 #endif 265 } else if (my_buffer != 0) { /* see _nc_freeall() */ 266 free(my_buffer); 267 my_buffer = 0; 268 my_length = 0; 269 } 270 return result; 271 } 272 273 #if NCURSES_SP_FUNCS 274 NCURSES_EXPORT(char *) 275 _nc_printf_string(const char *fmt, va_list ap) 276 { 277 return NCURSES_SP_NAME(_nc_printf_string) (CURRENT_SCREEN, fmt, ap); 278 } 279 #endif 280