Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2008 Travis Geiselbrecht |
| 3 | * |
| 4 | * Permission is hereby granted, free of charge, to any person obtaining |
| 5 | * a copy of this software and associated documentation files |
| 6 | * (the "Software"), to deal in the Software without restriction, |
| 7 | * including without limitation the rights to use, copy, modify, merge, |
| 8 | * publish, distribute, sublicense, and/or sell copies of the Software, |
| 9 | * and to permit persons to whom the Software is furnished to do so, |
| 10 | * subject to the following conditions: |
| 11 | * |
| 12 | * The above copyright notice and this permission notice shall be |
| 13 | * included in all copies or substantial portions of the Software. |
| 14 | * |
| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| 16 | * EXPRESS 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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| 19 | * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| 20 | * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| 21 | * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 22 | */ |
| 23 | #include <limits.h> |
| 24 | #include <stdarg.h> |
| 25 | #include <sys/types.h> |
| 26 | #include <printf.h> |
| 27 | #include <string.h> |
| 28 | |
| 29 | int printf(const char *fmt, ...) |
| 30 | { |
| 31 | int err; |
| 32 | |
| 33 | va_list ap; |
| 34 | va_start(ap, fmt); |
| 35 | err = dvprintf(fmt, ap); |
| 36 | va_end(ap); |
| 37 | |
| 38 | return err; |
| 39 | } |
| 40 | |
| 41 | int sprintf(char *str, const char *fmt, ...) |
| 42 | { |
| 43 | int err; |
| 44 | |
| 45 | va_list ap; |
| 46 | va_start(ap, fmt); |
| 47 | err = vsprintf(str, fmt, ap); |
| 48 | va_end(ap); |
| 49 | |
| 50 | return err; |
| 51 | } |
| 52 | |
| 53 | |
| 54 | #define LONGFLAG 0x00000001 |
| 55 | #define LONGLONGFLAG 0x00000002 |
| 56 | #define HALFFLAG 0x00000004 |
| 57 | #define HALFHALFFLAG 0x00000008 |
| 58 | #define SIZETFLAG 0x00000010 |
| 59 | #define ALTFLAG 0x00000020 |
| 60 | #define CAPSFLAG 0x00000040 |
| 61 | #define SHOWSIGNFLAG 0x00000080 |
| 62 | #define SIGNEDFLAG 0x00000100 |
| 63 | #define LEFTFORMATFLAG 0x00000200 |
| 64 | #define LEADZEROFLAG 0x00000400 |
| 65 | |
| 66 | static char *longlong_to_string(char *buf, unsigned long long n, int len, uint flag) |
| 67 | { |
| 68 | int pos = len; |
| 69 | int negative = 0; |
| 70 | |
| 71 | if((flag & SIGNEDFLAG) && (long long)n < 0) { |
| 72 | negative = 1; |
| 73 | n = -n; |
| 74 | } |
| 75 | |
| 76 | buf[--pos] = 0; |
| 77 | |
| 78 | /* only do the math if the number is >= 10 */ |
| 79 | while(n >= 10) { |
| 80 | int digit = n % 10; |
| 81 | |
| 82 | n /= 10; |
| 83 | |
| 84 | buf[--pos] = digit + '0'; |
| 85 | } |
| 86 | buf[--pos] = n + '0'; |
| 87 | |
| 88 | if(negative) |
| 89 | buf[--pos] = '-'; |
| 90 | else if((flag & SHOWSIGNFLAG)) |
| 91 | buf[--pos] = '+'; |
| 92 | |
| 93 | return &buf[pos]; |
| 94 | } |
| 95 | |
| 96 | static char *longlong_to_hexstring(char *buf, unsigned long long u, int len, uint flag) |
| 97 | { |
| 98 | int pos = len; |
| 99 | static const char hextable[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; |
| 100 | static const char hextable_caps[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; |
| 101 | const char *table; |
| 102 | |
| 103 | if((flag & CAPSFLAG)) |
| 104 | table = hextable_caps; |
| 105 | else |
| 106 | table = hextable; |
| 107 | |
| 108 | buf[--pos] = 0; |
| 109 | do { |
| 110 | unsigned int digit = u % 16; |
| 111 | u /= 16; |
| 112 | |
| 113 | buf[--pos] = table[digit]; |
| 114 | } while(u != 0); |
| 115 | |
| 116 | return &buf[pos]; |
| 117 | } |
| 118 | |
| 119 | int vsprintf(char *str, const char *fmt, va_list ap) |
| 120 | { |
| 121 | char c; |
| 122 | unsigned char uc; |
| 123 | const char *s; |
| 124 | unsigned long long n; |
| 125 | void *ptr; |
| 126 | int flags; |
| 127 | unsigned int format_num; |
| 128 | int chars_written = 0; |
| 129 | char num_buffer[32]; |
| 130 | |
| 131 | #define OUTPUT_CHAR(c) do { (*str++ = c); chars_written++; } while(0) |
| 132 | |
| 133 | for(;;) { |
| 134 | /* handle regular chars that aren't format related */ |
| 135 | while((c = *fmt++) != 0) { |
| 136 | if(c == '%') |
| 137 | break; /* we saw a '%', break and start parsing format */ |
| 138 | OUTPUT_CHAR(c); |
| 139 | } |
| 140 | |
| 141 | /* make sure we haven't just hit the end of the string */ |
| 142 | if(c == 0) |
| 143 | break; |
| 144 | |
| 145 | /* reset the format state */ |
| 146 | flags = 0; |
| 147 | format_num = 0; |
| 148 | |
| 149 | next_format: |
| 150 | /* grab the next format character */ |
| 151 | c = *fmt++; |
| 152 | if(c == 0) |
| 153 | break; |
| 154 | |
| 155 | switch(c) { |
| 156 | case '0'...'9': |
| 157 | if (c == '0' && format_num == 0) |
| 158 | flags |= LEADZEROFLAG; |
| 159 | format_num *= 10; |
| 160 | format_num += c - '0'; |
| 161 | goto next_format; |
| 162 | case '.': |
| 163 | /* XXX for now eat numeric formatting */ |
| 164 | goto next_format; |
| 165 | case '%': |
| 166 | OUTPUT_CHAR('%'); |
| 167 | break; |
| 168 | case 'c': |
| 169 | uc = va_arg(ap, unsigned int); |
| 170 | OUTPUT_CHAR(uc); |
| 171 | break; |
| 172 | case 's': |
| 173 | s = va_arg(ap, const char *); |
| 174 | if(s == 0) |
| 175 | s = "<null>"; |
| 176 | goto _output_string; |
| 177 | case '-': |
| 178 | flags |= LEFTFORMATFLAG; |
| 179 | goto next_format; |
| 180 | case '+': |
| 181 | flags |= SHOWSIGNFLAG; |
| 182 | goto next_format; |
| 183 | case '#': |
| 184 | flags |= ALTFLAG; |
| 185 | goto next_format; |
| 186 | case 'l': |
| 187 | if(flags & LONGFLAG) |
| 188 | flags |= LONGLONGFLAG; |
| 189 | flags |= LONGFLAG; |
| 190 | goto next_format; |
| 191 | case 'h': |
| 192 | if(flags & HALFFLAG) |
| 193 | flags |= HALFHALFFLAG; |
| 194 | flags |= HALFFLAG; |
| 195 | goto next_format; |
| 196 | case 'z': |
| 197 | flags |= SIZETFLAG; |
| 198 | goto next_format; |
| 199 | case 'D': |
| 200 | flags |= LONGFLAG; |
| 201 | /* fallthrough */ |
| 202 | case 'i': |
| 203 | case 'd': |
| 204 | n = (flags & LONGLONGFLAG) ? va_arg(ap, long long) : |
| 205 | (flags & LONGFLAG) ? va_arg(ap, long) : |
| 206 | (flags & HALFHALFFLAG) ? (signed char)va_arg(ap, int) : |
| 207 | (flags & HALFFLAG) ? (short)va_arg(ap, int) : |
| 208 | (flags & SIZETFLAG) ? va_arg(ap, ssize_t) : |
| 209 | va_arg(ap, int); |
| 210 | flags |= SIGNEDFLAG; |
| 211 | s = longlong_to_string(num_buffer, n, sizeof(num_buffer), flags); |
| 212 | goto _output_string; |
| 213 | case 'U': |
| 214 | flags |= LONGFLAG; |
| 215 | /* fallthrough */ |
| 216 | case 'u': |
| 217 | n = (flags & LONGLONGFLAG) ? va_arg(ap, unsigned long long) : |
| 218 | (flags & LONGFLAG) ? va_arg(ap, unsigned long) : |
| 219 | (flags & HALFHALFFLAG) ? (unsigned char)va_arg(ap, unsigned int) : |
| 220 | (flags & HALFFLAG) ? (unsigned short)va_arg(ap, unsigned int) : |
| 221 | (flags & SIZETFLAG) ? va_arg(ap, size_t) : |
| 222 | va_arg(ap, unsigned int); |
| 223 | s = longlong_to_string(num_buffer, n, sizeof(num_buffer), flags); |
| 224 | goto _output_string; |
| 225 | case 'p': |
| 226 | flags |= LONGFLAG | ALTFLAG; |
| 227 | goto hex; |
| 228 | case 'X': |
| 229 | flags |= CAPSFLAG; |
| 230 | /* fallthrough */ |
| 231 | hex: |
| 232 | case 'x': |
| 233 | n = (flags & LONGLONGFLAG) ? va_arg(ap, unsigned long long) : |
| 234 | (flags & LONGFLAG) ? va_arg(ap, unsigned long) : |
| 235 | (flags & HALFHALFFLAG) ? (unsigned char)va_arg(ap, unsigned int) : |
| 236 | (flags & HALFFLAG) ? (unsigned short)va_arg(ap, unsigned int) : |
| 237 | (flags & SIZETFLAG) ? va_arg(ap, size_t) : |
| 238 | va_arg(ap, unsigned int); |
| 239 | s = longlong_to_hexstring(num_buffer, n, sizeof(num_buffer), flags); |
| 240 | if(flags & ALTFLAG) { |
| 241 | OUTPUT_CHAR('0'); |
| 242 | OUTPUT_CHAR((flags & CAPSFLAG) ? 'X': 'x'); |
| 243 | } |
| 244 | goto _output_string; |
| 245 | case 'n': |
| 246 | ptr = va_arg(ap, void *); |
| 247 | if(flags & LONGLONGFLAG) |
| 248 | *(long long *)ptr = chars_written; |
| 249 | else if(flags & LONGFLAG) |
| 250 | *(long *)ptr = chars_written; |
| 251 | else if(flags & HALFHALFFLAG) |
| 252 | *(signed char *)ptr = chars_written; |
| 253 | else if(flags & HALFFLAG) |
| 254 | *(short *)ptr = chars_written; |
| 255 | else if(flags & SIZETFLAG) |
| 256 | *(size_t *)ptr = chars_written; |
| 257 | else |
| 258 | *(int *)ptr = chars_written; |
| 259 | break; |
| 260 | default: |
| 261 | OUTPUT_CHAR('%'); |
| 262 | OUTPUT_CHAR(c); |
| 263 | break; |
| 264 | } |
| 265 | |
| 266 | /* move on to the next field */ |
| 267 | continue; |
| 268 | |
| 269 | /* shared output code */ |
| 270 | _output_string: |
| 271 | if (flags & LEFTFORMATFLAG) { |
| 272 | /* left justify the text */ |
| 273 | uint count = 0; |
| 274 | while(*s != 0) { |
| 275 | OUTPUT_CHAR(*s++); |
| 276 | count++; |
| 277 | } |
| 278 | |
| 279 | /* pad to the right (if necessary) */ |
| 280 | for (; format_num > count; format_num--) |
| 281 | OUTPUT_CHAR(' '); |
| 282 | } else { |
| 283 | /* right justify the text (digits) */ |
| 284 | size_t string_len = strlen(s); |
| 285 | char outchar = (flags & LEADZEROFLAG) ? '0' : ' '; |
| 286 | for (; format_num > string_len; format_num--) |
| 287 | OUTPUT_CHAR(outchar); |
| 288 | |
| 289 | /* output the string */ |
| 290 | while(*s != 0) |
| 291 | OUTPUT_CHAR(*s++); |
| 292 | } |
| 293 | continue; |
| 294 | } |
| 295 | |
| 296 | /* null terminate */ |
| 297 | OUTPUT_CHAR('\0'); |
| 298 | chars_written--; /* don't count the null */ |
| 299 | |
| 300 | #undef OUTPUT_CHAR |
| 301 | |
| 302 | return chars_written; |
| 303 | } |
| 304 | |
| 305 | |