Annotation of embedaddon/bird/lib/printf.c, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD Library -- Formatted Output
! 3: *
! 4: * (c) 1991, 1992 Lars Wirzenius & Linus Torvalds
! 5: *
! 6: * Hacked up for BIRD by Martin Mares <mj@ucw.cz>
! 7: * Buffer size limitation implemented by Martin Mares.
! 8: */
! 9:
! 10: #include "nest/bird.h"
! 11: #include "string.h"
! 12:
! 13: #include <errno.h>
! 14:
! 15: #include "nest/iface.h"
! 16:
! 17: /* we use this so that we can do without the ctype library */
! 18: #define is_digit(c) ((c) >= '0' && (c) <= '9')
! 19:
! 20: static int skip_atoi(const char **s)
! 21: {
! 22: int i=0;
! 23:
! 24: while (is_digit(**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 */
! 34: #define SPECIAL 32 /* 0x */
! 35: #define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
! 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, int remains)
! 45: {
! 46: char c,sign,tmp[66];
! 47: const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
! 48: int i;
! 49:
! 50: if (size >= 0 && (remains -= size) < 0)
! 51: return NULL;
! 52: if (type & LARGE)
! 53: digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
! 54: if (type & LEFT)
! 55: type &= ~ZEROPAD;
! 56: if (base < 2 || base > 36)
! 57: return 0;
! 58: c = (type & ZEROPAD) ? '0' : ' ';
! 59: sign = 0;
! 60: if (type & SIGN) {
! 61: if (num < 0) {
! 62: sign = '-';
! 63: num = -num;
! 64: size--;
! 65: } else if (type & PLUS) {
! 66: sign = '+';
! 67: size--;
! 68: } else if (type & SPACE) {
! 69: sign = ' ';
! 70: size--;
! 71: }
! 72: }
! 73: if (type & SPECIAL) {
! 74: if (base == 16)
! 75: size -= 2;
! 76: else if (base == 8)
! 77: size--;
! 78: }
! 79: i = 0;
! 80: if (num == 0)
! 81: tmp[i++]='0';
! 82: else while (num != 0)
! 83: tmp[i++] = digits[do_div(num,base)];
! 84: if (i > precision)
! 85: precision = i;
! 86: size -= precision;
! 87: if (size < 0 && -size > remains)
! 88: return NULL;
! 89: if (!(type&(ZEROPAD+LEFT)))
! 90: while(size-->0)
! 91: *str++ = ' ';
! 92: if (sign)
! 93: *str++ = sign;
! 94: if (type & SPECIAL) {
! 95: if (base==8)
! 96: *str++ = '0';
! 97: else if (base==16) {
! 98: *str++ = '0';
! 99: *str++ = digits[33];
! 100: }
! 101: }
! 102: if (!(type & LEFT))
! 103: while (size-- > 0)
! 104: *str++ = c;
! 105: while (i < precision--)
! 106: *str++ = '0';
! 107: while (i-- > 0)
! 108: *str++ = tmp[i];
! 109: while (size-- > 0)
! 110: *str++ = ' ';
! 111: return str;
! 112: }
! 113:
! 114: /**
! 115: * bvsnprintf - BIRD's vsnprintf()
! 116: * @buf: destination buffer
! 117: * @size: size of the buffer
! 118: * @fmt: format string
! 119: * @args: a list of arguments to be formatted
! 120: *
! 121: * This functions acts like ordinary sprintf() except that it checks
! 122: * available space to avoid buffer overflows and it allows some more
! 123: * format specifiers: |%I| for formatting of IP addresses (any non-zero
! 124: * width is automatically replaced by standard IP address width which
! 125: * depends on whether we use IPv4 or IPv6; |%#I| gives hexadecimal format),
! 126: * |%R| for Router / Network ID (u32 value printed as IPv4 address)
! 127: * |%lR| for 64bit Router / Network ID (u64 value printed as eight :-separated octets)
! 128: * and |%m| resp. |%M| for error messages (uses strerror() to translate @errno code to
! 129: * message text). On the other hand, it doesn't support floating
! 130: * point numbers.
! 131: *
! 132: * Result: number of characters of the output string or -1 if
! 133: * the buffer space was insufficient.
! 134: */
! 135: int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
! 136: {
! 137: int len;
! 138: unsigned long num;
! 139: int i, base;
! 140: u32 x;
! 141: u64 X;
! 142: char *str, *start;
! 143: const char *s;
! 144: char ipbuf[MAX(STD_ADDRESS_P_LENGTH,ROUTER_ID_64_LENGTH)+1];
! 145: struct iface *iface;
! 146:
! 147: int flags; /* flags to number() */
! 148:
! 149: int field_width; /* width of output field */
! 150: int precision; /* min. # of digits for integers; max
! 151: number of chars for from string */
! 152: int qualifier; /* 'h', 'l', or 'L' for integer fields */
! 153:
! 154: for (start=str=buf ; *fmt ; ++fmt, size-=(str-start), start=str) {
! 155: if (*fmt != '%') {
! 156: if (!size)
! 157: return -1;
! 158: *str++ = *fmt;
! 159: continue;
! 160: }
! 161:
! 162: /* process flags */
! 163: flags = 0;
! 164: repeat:
! 165: ++fmt; /* this also skips first '%' */
! 166: switch (*fmt) {
! 167: case '-': flags |= LEFT; goto repeat;
! 168: case '+': flags |= PLUS; goto repeat;
! 169: case ' ': flags |= SPACE; goto repeat;
! 170: case '#': flags |= SPECIAL; goto repeat;
! 171: case '0': flags |= ZEROPAD; goto repeat;
! 172: }
! 173:
! 174: /* get field width */
! 175: field_width = -1;
! 176: if (is_digit(*fmt))
! 177: field_width = skip_atoi(&fmt);
! 178: else if (*fmt == '*') {
! 179: ++fmt;
! 180: /* it's the next argument */
! 181: field_width = va_arg(args, int);
! 182: if (field_width < 0) {
! 183: field_width = -field_width;
! 184: flags |= LEFT;
! 185: }
! 186: }
! 187:
! 188: /* get the precision */
! 189: precision = -1;
! 190: if (*fmt == '.') {
! 191: ++fmt;
! 192: if (is_digit(*fmt))
! 193: precision = skip_atoi(&fmt);
! 194: else if (*fmt == '*') {
! 195: ++fmt;
! 196: /* it's the next argument */
! 197: precision = va_arg(args, int);
! 198: }
! 199: if (precision < 0)
! 200: precision = 0;
! 201: }
! 202:
! 203: /* get the conversion qualifier */
! 204: qualifier = -1;
! 205: if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
! 206: qualifier = *fmt;
! 207: ++fmt;
! 208: }
! 209:
! 210: /* default base */
! 211: base = 10;
! 212:
! 213: if (field_width > size)
! 214: return -1;
! 215: switch (*fmt) {
! 216: case 'c':
! 217: if (!(flags & LEFT))
! 218: while (--field_width > 0)
! 219: *str++ = ' ';
! 220: *str++ = (byte) va_arg(args, int);
! 221: while (--field_width > 0)
! 222: *str++ = ' ';
! 223: continue;
! 224:
! 225: case 'm':
! 226: if (flags & SPECIAL) {
! 227: if (!errno)
! 228: continue;
! 229: if (size < 2)
! 230: return -1;
! 231: *str++ = ':';
! 232: *str++ = ' ';
! 233: start += 2;
! 234: size -= 2;
! 235: }
! 236: s = strerror(errno);
! 237: goto str;
! 238: case 'M':
! 239: s = strerror(va_arg(args, int));
! 240: goto str;
! 241: case 's':
! 242: s = va_arg(args, char *);
! 243: if (!s)
! 244: s = "<NULL>";
! 245:
! 246: str:
! 247: len = strlen(s);
! 248: if (precision >= 0 && len > precision)
! 249: len = precision;
! 250: if (len > size)
! 251: return -1;
! 252:
! 253: if (!(flags & LEFT))
! 254: while (len < field_width--)
! 255: *str++ = ' ';
! 256: for (i = 0; i < len; ++i)
! 257: *str++ = *s++;
! 258: while (len < field_width--)
! 259: *str++ = ' ';
! 260: continue;
! 261:
! 262: case 'p':
! 263: if (field_width == -1) {
! 264: field_width = 2*sizeof(void *);
! 265: flags |= ZEROPAD;
! 266: }
! 267: str = number(str,
! 268: (unsigned long) va_arg(args, void *), 16,
! 269: field_width, precision, flags, size);
! 270: if (!str)
! 271: return -1;
! 272: continue;
! 273:
! 274:
! 275: case 'n':
! 276: if (qualifier == 'l') {
! 277: long * ip = va_arg(args, long *);
! 278: *ip = (str - buf);
! 279: } else {
! 280: int * ip = va_arg(args, int *);
! 281: *ip = (str - buf);
! 282: }
! 283: continue;
! 284:
! 285: /* IP address */
! 286: case 'I':
! 287: if (flags & SPECIAL)
! 288: ipa_ntox(va_arg(args, ip_addr), ipbuf);
! 289: else {
! 290: ipa_ntop(va_arg(args, ip_addr), ipbuf);
! 291: if (field_width == 1)
! 292: field_width = STD_ADDRESS_P_LENGTH;
! 293: }
! 294: s = ipbuf;
! 295: goto str;
! 296:
! 297: /* Interface scope after link-local IP address */
! 298: case 'J':
! 299: iface = va_arg(args, struct iface *);
! 300: if (!iface)
! 301: continue;
! 302: if (!size)
! 303: return -1;
! 304:
! 305: *str++ = '%';
! 306: start++;
! 307: size--;
! 308:
! 309: s = iface->name;
! 310: goto str;
! 311:
! 312: /* Router/Network ID - essentially IPv4 address in u32 value */
! 313: case 'R':
! 314: if(qualifier == 'l') {
! 315: X = va_arg(args, u64);
! 316: bsprintf(ipbuf, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
! 317: ((X >> 56) & 0xff),
! 318: ((X >> 48) & 0xff),
! 319: ((X >> 40) & 0xff),
! 320: ((X >> 32) & 0xff),
! 321: ((X >> 24) & 0xff),
! 322: ((X >> 16) & 0xff),
! 323: ((X >> 8) & 0xff),
! 324: (X & 0xff));
! 325: }
! 326: else
! 327: {
! 328: x = va_arg(args, u32);
! 329: bsprintf(ipbuf, "%d.%d.%d.%d",
! 330: ((x >> 24) & 0xff),
! 331: ((x >> 16) & 0xff),
! 332: ((x >> 8) & 0xff),
! 333: (x & 0xff));
! 334: }
! 335: s = ipbuf;
! 336: goto str;
! 337:
! 338: /* integer number formats - set up the flags and "break" */
! 339: case 'o':
! 340: base = 8;
! 341: break;
! 342:
! 343: case 'X':
! 344: flags |= LARGE;
! 345: case 'x':
! 346: base = 16;
! 347: break;
! 348:
! 349: case 'd':
! 350: case 'i':
! 351: flags |= SIGN;
! 352: case 'u':
! 353: break;
! 354:
! 355: default:
! 356: if (size < 2)
! 357: return -1;
! 358: if (*fmt != '%')
! 359: *str++ = '%';
! 360: if (*fmt)
! 361: *str++ = *fmt;
! 362: else
! 363: --fmt;
! 364: continue;
! 365: }
! 366: if (qualifier == 'l')
! 367: num = va_arg(args, unsigned long);
! 368: else if (qualifier == 'h') {
! 369: num = (unsigned short) va_arg(args, int);
! 370: if (flags & SIGN)
! 371: num = (short) num;
! 372: } else if (flags & SIGN)
! 373: num = va_arg(args, int);
! 374: else
! 375: num = va_arg(args, uint);
! 376: str = number(str, num, base, field_width, precision, flags, size);
! 377: if (!str)
! 378: return -1;
! 379: }
! 380: if (!size)
! 381: return -1;
! 382: *str = '\0';
! 383: return str-buf;
! 384: }
! 385:
! 386: /**
! 387: * bvsprintf - BIRD's vsprintf()
! 388: * @buf: buffer
! 389: * @fmt: format string
! 390: * @args: a list of arguments to be formatted
! 391: *
! 392: * This function is equivalent to bvsnprintf() with an infinite
! 393: * buffer size. Please use carefully only when you are absolutely
! 394: * sure the buffer won't overflow.
! 395: */
! 396: int bvsprintf(char *buf, const char *fmt, va_list args)
! 397: {
! 398: return bvsnprintf(buf, 1000000000, fmt, args);
! 399: }
! 400:
! 401: /**
! 402: * bsprintf - BIRD's sprintf()
! 403: * @buf: buffer
! 404: * @fmt: format string
! 405: *
! 406: * This function is equivalent to bvsnprintf() with an infinite
! 407: * buffer size and variable arguments instead of a &va_list.
! 408: * Please use carefully only when you are absolutely
! 409: * sure the buffer won't overflow.
! 410: */
! 411: int bsprintf(char * buf, const char *fmt, ...)
! 412: {
! 413: va_list args;
! 414: int i;
! 415:
! 416: va_start(args, fmt);
! 417: i=bvsnprintf(buf, 1000000000, fmt, args);
! 418: va_end(args);
! 419: return i;
! 420: }
! 421:
! 422: /**
! 423: * bsnprintf - BIRD's snprintf()
! 424: * @buf: buffer
! 425: * @size: buffer size
! 426: * @fmt: format string
! 427: *
! 428: * This function is equivalent to bsnprintf() with variable arguments instead of a &va_list.
! 429: */
! 430: int bsnprintf(char * buf, int size, const char *fmt, ...)
! 431: {
! 432: va_list args;
! 433: int i;
! 434:
! 435: va_start(args, fmt);
! 436: i=bvsnprintf(buf, size, fmt, args);
! 437: va_end(args);
! 438: return i;
! 439: }
! 440:
! 441: int
! 442: buffer_vprint(buffer *buf, const char *fmt, va_list args)
! 443: {
! 444: int i = bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
! 445: buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
! 446: return i;
! 447: }
! 448:
! 449: int
! 450: buffer_print(buffer *buf, const char *fmt, ...)
! 451: {
! 452: va_list args;
! 453: int i;
! 454:
! 455: va_start(args, fmt);
! 456: i=bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
! 457: va_end(args);
! 458:
! 459: buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
! 460: return i;
! 461: }
! 462:
! 463: void
! 464: buffer_puts(buffer *buf, const char *str)
! 465: {
! 466: byte *bp = buf->pos;
! 467: byte *be = buf->end;
! 468:
! 469: while (bp < be && *str)
! 470: *bp++ = *str++;
! 471:
! 472: if (bp < be)
! 473: *bp = 0;
! 474:
! 475: buf->pos = bp;
! 476: }
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