target/linux/generic/image/lzma-loader/src/print.c

   1 /*
   2  * Copyright (C) 2001 MontaVista Software Inc.
   3  * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
   4  *
   5  * This program is free software; you can redistribute  it and/or modify it
   6  * under  the terms of  the GNU General  Public License as published by the
   7  * Free Software Foundation;  either version 2 of the  License, or (at your
   8  * option) any later version.
   9  *
  10  */
  11
  12 #include        "print.h"
  13
  14 /* macros */
  15 #define         IsDigit(x)      ( ((x) >= '0') && ((x) <= '9') )
  16 #define         Ctod(x)         ( (x) - '0')
  17
  18 /* forward declaration */
  19 extern int PrintChar(char *, char, int, int);
  20 extern int PrintString(char *, char *, int, int);
  21 extern int PrintNum(char *, unsigned long, int, int, int, int, char, int);
  22
  23 /* private variable */
  24 static const char theFatalMsg[] = "fatal error in lp_Print!";
  25
  26 /* -*-
  27  * A low level printf() function.
  28  */
  29 void
  30 lp_Print(void (*output)(void *, char *, int),
  31          void * arg,
  32          char *fmt,
  33          va_list ap)
  34 {
  35
  36 #define         OUTPUT(arg, s, l)  \
  37   { if (((l) < 0) || ((l) > LP_MAX_BUF)) { \
  38        (*output)(arg, (char*)theFatalMsg, sizeof(theFatalMsg)-1); for(;;); \
  39     } else { \
  40       (*output)(arg, s, l); \
  41     } \
  42   }
  43
  44     char buf[LP_MAX_BUF];
  45
  46     char c;
  47     char *s;
  48     long int num;
  49
  50     int longFlag;
  51     int negFlag;
  52     int width;
  53     int prec;
  54     int ladjust;
  55     char padc;
  56
  57     int length;
  58
  59     for(;;) {
  60         {
  61             /* scan for the next '%' */
  62             char *fmtStart = fmt;
  63             while ( (*fmt != '\0') && (*fmt != '%')) {
  64                 fmt ++;
  65             }
  66
  67             /* flush the string found so far */
  68             OUTPUT(arg, fmtStart, fmt-fmtStart);
  69
  70             /* are we hitting the end? */
  71             if (*fmt == '\0') break;
  72         }
  73
  74         /* we found a '%' */
  75         fmt ++;
  76
  77         /* check for long */
  78         if (*fmt == 'l') {
  79             longFlag = 1;
  80             fmt ++;
  81         } else {
  82             longFlag = 0;
  83         }
  84
  85         /* check for other prefixes */
  86         width = 0;
  87         prec = -1;
  88         ladjust = 0;
  89         padc = ' ';
  90
  91         if (*fmt == '-') {
  92             ladjust = 1;
  93             fmt ++;
  94         }
  95
  96         if (*fmt == '0') {
  97             padc = '0';
  98             fmt++;
  99         }
 100
 101         if (IsDigit(*fmt)) {
 102             while (IsDigit(*fmt)) {
 103                 width = 10 * width + Ctod(*fmt++);
 104             }
 105         }
 106
 107         if (*fmt == '.') {
 108             fmt ++;
 109             if (IsDigit(*fmt)) {
 110                 prec = 0;
 111                 while (IsDigit(*fmt)) {
 112                     prec = prec*10 + Ctod(*fmt++);
 113                 }
 114             }
 115         }
 116
 117
 118         /* check format flag */
 119         negFlag = 0;
 120         switch (*fmt) {
 121          case 'b':
 122             if (longFlag) {
 123                 num = va_arg(ap, long int);
 124             } else {
 125                 num = va_arg(ap, int);
 126             }
 127             length = PrintNum(buf, num, 2, 0, width, ladjust, padc, 0);
 128             OUTPUT(arg, buf, length);
 129             break;
 130
 131          case 'd':
 132          case 'D':
 133             if (longFlag) {
 134                 num = va_arg(ap, long int);
 135             } else {
 136                 num = va_arg(ap, int);
 137             }
 138             if (num < 0) {
 139                 num = - num;
 140                 negFlag = 1;
 141             }
 142             length = PrintNum(buf, num, 10, negFlag, width, ladjust, padc, 0);
 143             OUTPUT(arg, buf, length);
 144             break;
 145
 146          case 'o':
 147          case 'O':
 148             if (longFlag) {
 149                 num = va_arg(ap, long int);
 150             } else {
 151                 num = va_arg(ap, int);
 152             }
 153             length = PrintNum(buf, num, 8, 0, width, ladjust, padc, 0);
 154             OUTPUT(arg, buf, length);
 155             break;
 156
 157          case 'u':
 158          case 'U':
 159             if (longFlag) {
 160                 num = va_arg(ap, long int);
 161             } else {
 162                 num = va_arg(ap, int);
 163             }
 164             length = PrintNum(buf, num, 10, 0, width, ladjust, padc, 0);
 165             OUTPUT(arg, buf, length);
 166             break;
 167
 168          case 'x':
 169             if (longFlag) {
 170                 num = va_arg(ap, long int);
 171             } else {
 172                 num = va_arg(ap, int);
 173             }
 174             length = PrintNum(buf, num, 16, 0, width, ladjust, padc, 0);
 175             OUTPUT(arg, buf, length);
 176             break;
 177
 178          case 'X':
 179             if (longFlag) {
 180                 num = va_arg(ap, long int);
 181             } else {
 182                 num = va_arg(ap, int);
 183             }
 184             length = PrintNum(buf, num, 16, 0, width, ladjust, padc, 1);
 185             OUTPUT(arg, buf, length);
 186             break;
 187
 188          case 'c':
 189             c = (char)va_arg(ap, int);
 190             length = PrintChar(buf, c, width, ladjust);
 191             OUTPUT(arg, buf, length);
 192             break;
 193
 194          case 's':
 195             s = (char*)va_arg(ap, char *);
 196             length = PrintString(buf, s, width, ladjust);
 197             OUTPUT(arg, buf, length);
 198             break;
 199
 200          case '\0':
 201             fmt --;
 202             break;
 203
 204          default:
 205             /* output this char as it is */
 206             OUTPUT(arg, fmt, 1);
 207         }       /* switch (*fmt) */
 208
 209         fmt ++;
 210     }           /* for(;;) */
 211
 212     /* special termination call */
 213     OUTPUT(arg, "\0", 1);
 214 }
 215
 216
 217 /* --------------- local help functions --------------------- */
 218 int
 219 PrintChar(char * buf, char c, int length, int ladjust)
 220 {
 221     int i;
 222
 223     if (length < 1) length = 1;
 224     if (ladjust) {
 225         *buf = c;
 226         for (i=1; i< length; i++) buf[i] = ' ';
 227     } else {
 228         for (i=0; i< length-1; i++) buf[i] = ' ';
 229         buf[length - 1] = c;
 230     }
 231     return length;
 232 }
 233
 234 int
 235 PrintString(char * buf, char* s, int length, int ladjust)
 236 {
 237     int i;
 238     int len=0;
 239     char* s1 = s;
 240     while (*s1++) len++;
 241     if (length < len) length = len;
 242
 243     if (ladjust) {
 244         for (i=0; i< len; i++) buf[i] = s[i];
 245         for (i=len; i< length; i++) buf[i] = ' ';
 246     } else {
 247         for (i=0; i< length-len; i++) buf[i] = ' ';
 248         for (i=length-len; i < length; i++) buf[i] = s[i-length+len];
 249     }
 250     return length;
 251 }
 252
 253 int
 254 PrintNum(char * buf, unsigned long u, int base, int negFlag,
 255          int length, int ladjust, char padc, int upcase)
 256 {
 257     /* algorithm :
 258      *  1. prints the number from left to right in reverse form.
 259      *  2. fill the remaining spaces with padc if length is longer than
 260      *     the actual length
 261      *     TRICKY : if left adjusted, no "0" padding.
 262      *              if negtive, insert  "0" padding between "0" and number.
 263      *  3. if (!ladjust) we reverse the whole string including paddings
 264      *  4. otherwise we only reverse the actual string representing the num.
 265      */
 266
 267     int actualLength =0;
 268     char *p = buf;
 269     int i;
 270
 271     do {
 272         int tmp = u %base;
 273         if (tmp <= 9) {
 274             *p++ = '0' + tmp;
 275         } else if (upcase) {
 276             *p++ = 'A' + tmp - 10;
 277         } else {
 278             *p++ = 'a' + tmp - 10;
 279         }
 280         u /= base;
 281     } while (u != 0);
 282
 283     if (negFlag) {
 284         *p++ = '-';
 285     }
 286
 287     /* figure out actual length and adjust the maximum length */
 288     actualLength = p - buf;
 289     if (length < actualLength) length = actualLength;
 290
 291     /* add padding */
 292     if (ladjust) {
 293         padc = ' ';
 294     }
 295     if (negFlag && !ladjust && (padc == '0')) {
 296         for (i = actualLength-1; i< length-1; i++) buf[i] = padc;
 297         buf[length -1] = '-';
 298     } else {
 299         for (i = actualLength; i< length; i++) buf[i] = padc;
 300     }
 301
 302
 303     /* prepare to reverse the string */
 304     {
 305         int begin = 0;
 306         int end;
 307         if (ladjust) {
 308             end = actualLength - 1;
 309         } else {
 310             end = length -1;
 311         }
 312
 313         while (end > begin) {
 314             char tmp = buf[begin];
 315             buf[begin] = buf[end];
 316             buf[end] = tmp;
 317             begin ++;
 318             end --;
 319         }
 320     }
 321
 322     /* adjust the string pointer */
 323     return length;
 324 }