H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 1 | /* -*- linux-c -*- ------------------------------------------------------- * |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
| 5 | * |
| 6 | * This file is part of the Linux kernel, and is made available under |
| 7 | * the terms of the GNU General Public License version 2. |
| 8 | * |
| 9 | * ----------------------------------------------------------------------- */ |
| 10 | |
| 11 | /* |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 12 | * Oh, it's a waste of space, but oh-so-yummy for debugging. This |
| 13 | * version of printf() does not include 64-bit support. "Live with |
| 14 | * it." |
| 15 | * |
| 16 | */ |
| 17 | |
| 18 | #include "boot.h" |
| 19 | |
| 20 | static int skip_atoi(const char **s) |
| 21 | { |
| 22 | int i = 0; |
| 23 | |
| 24 | while (isdigit(**s)) |
| 25 | i = i * 10 + *((*s)++) - '0'; |
| 26 | return i; |
| 27 | } |
| 28 | |
| 29 | #define ZEROPAD 1 /* pad with zero */ |
| 30 | #define SIGN 2 /* unsigned/signed long */ |
| 31 | #define PLUS 4 /* show plus */ |
| 32 | #define SPACE 8 /* space if plus */ |
| 33 | #define LEFT 16 /* left justified */ |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 34 | #define SMALL 32 /* Must be 32 == 0x20 */ |
| 35 | #define SPECIAL 64 /* 0x */ |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 36 | |
| 37 | #define do_div(n,base) ({ \ |
| 38 | int __res; \ |
| 39 | __res = ((unsigned long) n) % (unsigned) base; \ |
| 40 | n = ((unsigned long) n) / (unsigned) base; \ |
| 41 | __res; }) |
| 42 | |
| 43 | static char *number(char *str, long num, int base, int size, int precision, |
| 44 | int type) |
| 45 | { |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 46 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ |
| 47 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ |
| 48 | |
| 49 | char tmp[66]; |
| 50 | char c, sign, locase; |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 51 | int i; |
| 52 | |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 53 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' |
| 54 | * produces same digits or (maybe lowercased) letters */ |
| 55 | locase = (type & SMALL); |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 56 | if (type & LEFT) |
| 57 | type &= ~ZEROPAD; |
| 58 | if (base < 2 || base > 36) |
| 59 | return 0; |
| 60 | c = (type & ZEROPAD) ? '0' : ' '; |
| 61 | sign = 0; |
| 62 | if (type & SIGN) { |
| 63 | if (num < 0) { |
| 64 | sign = '-'; |
| 65 | num = -num; |
| 66 | size--; |
| 67 | } else if (type & PLUS) { |
| 68 | sign = '+'; |
| 69 | size--; |
| 70 | } else if (type & SPACE) { |
| 71 | sign = ' '; |
| 72 | size--; |
| 73 | } |
| 74 | } |
| 75 | if (type & SPECIAL) { |
| 76 | if (base == 16) |
| 77 | size -= 2; |
| 78 | else if (base == 8) |
| 79 | size--; |
| 80 | } |
| 81 | i = 0; |
| 82 | if (num == 0) |
| 83 | tmp[i++] = '0'; |
| 84 | else |
| 85 | while (num != 0) |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 86 | tmp[i++] = (digits[do_div(num, base)] | locase); |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 87 | if (i > precision) |
| 88 | precision = i; |
| 89 | size -= precision; |
| 90 | if (!(type & (ZEROPAD + LEFT))) |
| 91 | while (size-- > 0) |
| 92 | *str++ = ' '; |
| 93 | if (sign) |
| 94 | *str++ = sign; |
| 95 | if (type & SPECIAL) { |
| 96 | if (base == 8) |
| 97 | *str++ = '0'; |
| 98 | else if (base == 16) { |
| 99 | *str++ = '0'; |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 100 | *str++ = ('X' | locase); |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 101 | } |
| 102 | } |
| 103 | if (!(type & LEFT)) |
| 104 | while (size-- > 0) |
| 105 | *str++ = c; |
| 106 | while (i < precision--) |
| 107 | *str++ = '0'; |
| 108 | while (i-- > 0) |
| 109 | *str++ = tmp[i]; |
| 110 | while (size-- > 0) |
| 111 | *str++ = ' '; |
| 112 | return str; |
| 113 | } |
| 114 | |
| 115 | int vsprintf(char *buf, const char *fmt, va_list args) |
| 116 | { |
| 117 | int len; |
| 118 | unsigned long num; |
| 119 | int i, base; |
| 120 | char *str; |
| 121 | const char *s; |
| 122 | |
| 123 | int flags; /* flags to number() */ |
| 124 | |
| 125 | int field_width; /* width of output field */ |
| 126 | int precision; /* min. # of digits for integers; max |
| 127 | number of chars for from string */ |
| 128 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ |
| 129 | |
| 130 | for (str = buf; *fmt; ++fmt) { |
| 131 | if (*fmt != '%') { |
| 132 | *str++ = *fmt; |
| 133 | continue; |
| 134 | } |
| 135 | |
| 136 | /* process flags */ |
| 137 | flags = 0; |
| 138 | repeat: |
| 139 | ++fmt; /* this also skips first '%' */ |
| 140 | switch (*fmt) { |
| 141 | case '-': |
| 142 | flags |= LEFT; |
| 143 | goto repeat; |
| 144 | case '+': |
| 145 | flags |= PLUS; |
| 146 | goto repeat; |
| 147 | case ' ': |
| 148 | flags |= SPACE; |
| 149 | goto repeat; |
| 150 | case '#': |
| 151 | flags |= SPECIAL; |
| 152 | goto repeat; |
| 153 | case '0': |
| 154 | flags |= ZEROPAD; |
| 155 | goto repeat; |
| 156 | } |
| 157 | |
| 158 | /* get field width */ |
| 159 | field_width = -1; |
| 160 | if (isdigit(*fmt)) |
| 161 | field_width = skip_atoi(&fmt); |
| 162 | else if (*fmt == '*') { |
| 163 | ++fmt; |
| 164 | /* it's the next argument */ |
| 165 | field_width = va_arg(args, int); |
| 166 | if (field_width < 0) { |
| 167 | field_width = -field_width; |
| 168 | flags |= LEFT; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | /* get the precision */ |
| 173 | precision = -1; |
| 174 | if (*fmt == '.') { |
| 175 | ++fmt; |
| 176 | if (isdigit(*fmt)) |
| 177 | precision = skip_atoi(&fmt); |
| 178 | else if (*fmt == '*') { |
| 179 | ++fmt; |
| 180 | /* it's the next argument */ |
| 181 | precision = va_arg(args, int); |
| 182 | } |
| 183 | if (precision < 0) |
| 184 | precision = 0; |
| 185 | } |
| 186 | |
| 187 | /* get the conversion qualifier */ |
| 188 | qualifier = -1; |
| 189 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') { |
| 190 | qualifier = *fmt; |
| 191 | ++fmt; |
| 192 | } |
| 193 | |
| 194 | /* default base */ |
| 195 | base = 10; |
| 196 | |
| 197 | switch (*fmt) { |
| 198 | case 'c': |
| 199 | if (!(flags & LEFT)) |
| 200 | while (--field_width > 0) |
| 201 | *str++ = ' '; |
| 202 | *str++ = (unsigned char)va_arg(args, int); |
| 203 | while (--field_width > 0) |
| 204 | *str++ = ' '; |
| 205 | continue; |
| 206 | |
| 207 | case 's': |
| 208 | s = va_arg(args, char *); |
| 209 | len = strnlen(s, precision); |
| 210 | |
| 211 | if (!(flags & LEFT)) |
| 212 | while (len < field_width--) |
| 213 | *str++ = ' '; |
| 214 | for (i = 0; i < len; ++i) |
| 215 | *str++ = *s++; |
| 216 | while (len < field_width--) |
| 217 | *str++ = ' '; |
| 218 | continue; |
| 219 | |
| 220 | case 'p': |
| 221 | if (field_width == -1) { |
| 222 | field_width = 2 * sizeof(void *); |
| 223 | flags |= ZEROPAD; |
| 224 | } |
| 225 | str = number(str, |
| 226 | (unsigned long)va_arg(args, void *), 16, |
| 227 | field_width, precision, flags); |
| 228 | continue; |
| 229 | |
| 230 | case 'n': |
| 231 | if (qualifier == 'l') { |
| 232 | long *ip = va_arg(args, long *); |
| 233 | *ip = (str - buf); |
| 234 | } else { |
| 235 | int *ip = va_arg(args, int *); |
| 236 | *ip = (str - buf); |
| 237 | } |
| 238 | continue; |
| 239 | |
| 240 | case '%': |
| 241 | *str++ = '%'; |
| 242 | continue; |
| 243 | |
| 244 | /* integer number formats - set up the flags and "break" */ |
| 245 | case 'o': |
| 246 | base = 8; |
| 247 | break; |
| 248 | |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 249 | case 'x': |
Denys Vlasenko | 9b706ae | 2008-02-09 23:24:09 +0100 | [diff] [blame] | 250 | flags |= SMALL; |
| 251 | case 'X': |
H. Peter Anvin | 1543610 | 2007-07-11 12:18:45 -0700 | [diff] [blame] | 252 | base = 16; |
| 253 | break; |
| 254 | |
| 255 | case 'd': |
| 256 | case 'i': |
| 257 | flags |= SIGN; |
| 258 | case 'u': |
| 259 | break; |
| 260 | |
| 261 | default: |
| 262 | *str++ = '%'; |
| 263 | if (*fmt) |
| 264 | *str++ = *fmt; |
| 265 | else |
| 266 | --fmt; |
| 267 | continue; |
| 268 | } |
| 269 | if (qualifier == 'l') |
| 270 | num = va_arg(args, unsigned long); |
| 271 | else if (qualifier == 'h') { |
| 272 | num = (unsigned short)va_arg(args, int); |
| 273 | if (flags & SIGN) |
| 274 | num = (short)num; |
| 275 | } else if (flags & SIGN) |
| 276 | num = va_arg(args, int); |
| 277 | else |
| 278 | num = va_arg(args, unsigned int); |
| 279 | str = number(str, num, base, field_width, precision, flags); |
| 280 | } |
| 281 | *str = '\0'; |
| 282 | return str - buf; |
| 283 | } |
| 284 | |
| 285 | int sprintf(char *buf, const char *fmt, ...) |
| 286 | { |
| 287 | va_list args; |
| 288 | int i; |
| 289 | |
| 290 | va_start(args, fmt); |
| 291 | i = vsprintf(buf, fmt, args); |
| 292 | va_end(args); |
| 293 | return i; |
| 294 | } |
| 295 | |
| 296 | int printf(const char *fmt, ...) |
| 297 | { |
| 298 | char printf_buf[1024]; |
| 299 | va_list args; |
| 300 | int printed; |
| 301 | |
| 302 | va_start(args, fmt); |
| 303 | printed = vsprintf(printf_buf, fmt, args); |
| 304 | va_end(args); |
| 305 | |
| 306 | puts(printf_buf); |
| 307 | |
| 308 | return printed; |
| 309 | } |