1 /**************************************************************************** 2 * Copyright (c) 1998,1999,2000 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 1.14 2001/07/08 00:58:34 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 60 if (fmt == 0 || *fmt == '\0') 61 return -1; 62 if ((format = typeMalloc(char, strlen(fmt) + 1)) == 0) 63 return -1; 64 if ((buffer = typeMalloc(char, length)) == 0) { 65 free(format); 66 return -1; 67 } 68 69 while (*fmt != '\0') { 70 if (*fmt == '%') { 71 static char dummy[] = ""; 72 PRINTF state = Flags; 73 char *pval = dummy; /* avoid const-cast */ 74 double fval = 0.0; 75 int done = FALSE; 76 int ival = 0; 77 int prec = -1; 78 int type = 0; 79 int used = 0; 80 int width = -1; 81 size_t f = 0; 82 83 format[f++] = *fmt; 84 while (*++fmt != '\0' && len >= 0 && !done) { 85 format[f++] = *fmt; 86 87 if (isdigit(UChar(*fmt))) { 88 int num = *fmt - '0'; 89 if (state == Flags && num != 0) 90 state = Width; 91 if (state == Width) { 92 if (width < 0) 93 width = 0; 94 width = (width * 10) + num; 95 } else if (state == Prec) { 96 if (prec < 0) 97 prec = 0; 98 prec = (prec * 10) + num; 99 } 100 } else if (*fmt == '*') { 101 VA_INTGR(int); 102 if (state == Flags) 103 state = Width; 104 if (state == Width) { 105 width = ival; 106 } else if (state == Prec) { 107 prec = ival; 108 } 109 sprintf(&format[--f], "%d", ival); 110 f = strlen(format); 111 } else if (isalpha(UChar(*fmt))) { 112 done = TRUE; 113 switch (*fmt) { 114 case 'Z': /* FALLTHRU */ 115 case 'h': /* FALLTHRU */ 116 case 'l': /* FALLTHRU */ 117 done = FALSE; 118 type = *fmt; 119 break; 120 case 'i': /* FALLTHRU */ 121 case 'd': /* FALLTHRU */ 122 case 'u': /* FALLTHRU */ 123 case 'x': /* FALLTHRU */ 124 case 'X': /* FALLTHRU */ 125 if (type == 'l') 126 VA_INTGR(long); 127 else if (type == 'Z') 128 VA_INTGR(size_t); 129 else 130 VA_INTGR(int); 131 used = 'i'; 132 break; 133 case 'f': /* FALLTHRU */ 134 case 'e': /* FALLTHRU */ 135 case 'E': /* FALLTHRU */ 136 case 'g': /* FALLTHRU */ 137 case 'G': /* FALLTHRU */ 138 VA_FLOAT(double); 139 used = 'f'; 140 break; 141 case 'c': 142 VA_INTGR(int); 143 used = 'i'; 144 break; 145 case 's': 146 VA_POINT(char *); 147 if (prec < 0) 148 prec = strlen(pval); 149 if (prec > (int) length) { 150 length = length + prec; 151 buffer = typeRealloc(char, length, buffer); 152 if (buffer == 0) { 153 free(format); 154 return -1; 155 } 156 } 157 used = 'p'; 158 break; 159 case 'p': 160 VA_POINT(void *); 161 used = 'p'; 162 break; 163 case 'n': 164 VA_POINT(int *); 165 used = 0; 166 break; 167 default: 168 break; 169 } 170 } else if (*fmt == '.') { 171 state = Prec; 172 } else if (*fmt == '%') { 173 done = TRUE; 174 used = 'p'; 175 } 176 } 177 format[f] = '\0'; 178 switch (used) { 179 case 'i': 180 sprintf(buffer, format, ival); 181 break; 182 case 'f': 183 sprintf(buffer, format, fval); 184 break; 185 default: 186 sprintf(buffer, format, pval); 187 break; 188 } 189 len += (int) strlen(buffer); 190 } else { 191 fmt++; 192 len++; 193 } 194 } 195 196 free(buffer); 197 free(format); 198 return len; 199 } 200 #endif 201 202 /* 203 * Wrapper for vsprintf that allocates a buffer big enough to hold the result. 204 */ 205 NCURSES_EXPORT(char *) 206 _nc_printf_string 207 (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 if ((buf = typeMalloc(char, len + 1)) == 0) 215 return (0); 216 vsprintf(buf, fmt, ap); 217 } 218 #else 219 static int rows, cols; 220 static char *buf; 221 static size_t len; 222 223 if (screen_lines > rows || screen_columns > cols) { 224 if (screen_lines > rows) 225 rows = screen_lines; 226 if (screen_columns > cols) 227 cols = screen_columns; 228 len = (rows * (cols + 1)) + 1; 229 buf = typeRealloc(char, len, buf); 230 if (buf == 0) { 231 return (0); 232 } 233 } 234 235 if (buf != 0) { 236 # if HAVE_VSNPRINTF 237 vsnprintf(buf, len, fmt, ap); /* GNU extension */ 238 # else 239 vsprintf(buf, fmt, ap); /* ANSI */ 240 # endif 241 } 242 #endif 243 return buf; 244 } 245