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485 lines
10 KiB
C
485 lines
10 KiB
C
/*
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* BIRD Library -- Formatted Output
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*
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* (c) 1991, 1992 Lars Wirzenius & Linus Torvalds
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*
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* Hacked up for BIRD by Martin Mares <mj@ucw.cz>
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* Buffer size limitation implemented by Martin Mares.
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*/
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#include "nest/bird.h"
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#include "string.h"
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#include <errno.h>
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#include "nest/iface.h"
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/* we use this so that we can do without the ctype library */
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#define is_digit(c) ((c) >= '0' && (c) <= '9')
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static int skip_atoi(const char **s)
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{
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int i=0;
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while (is_digit(**s))
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i = i*10 + *((*s)++) - '0';
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return i;
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}
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SPECIAL 32 /* 0x */
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#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
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#define do_div(n,base) ({ \
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int __res; \
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__res = ((unsigned long) n) % (unsigned) base; \
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n = ((unsigned long) n) / (unsigned) base; \
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__res; })
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static char * number(char * str, long num, int base, int size, int precision,
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int type, int remains)
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{
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char c,sign,tmp[66];
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const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
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int i;
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if (size >= 0 && (remains -= size) < 0)
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return NULL;
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if (type & LARGE)
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digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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if (type & LEFT)
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type &= ~ZEROPAD;
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if (base < 2 || base > 36)
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return 0;
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN) {
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if (num < 0) {
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sign = '-';
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num = -num;
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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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i = 0;
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if (num == 0)
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tmp[i++]='0';
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else while (num != 0)
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tmp[i++] = digits[do_div(num,base)];
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if (i > precision)
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precision = i;
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size -= precision;
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if (size < 0 && -size > remains)
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return NULL;
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if (!(type&(ZEROPAD+LEFT)))
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while(size-->0)
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*str++ = ' ';
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if (sign)
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*str++ = sign;
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if (type & SPECIAL) {
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if (base==8)
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*str++ = '0';
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else if (base==16) {
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*str++ = '0';
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*str++ = digits[33];
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}
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}
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if (!(type & LEFT))
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while (size-- > 0)
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*str++ = c;
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while (i < precision--)
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*str++ = '0';
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while (i-- > 0)
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*str++ = tmp[i];
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while (size-- > 0)
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*str++ = ' ';
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return str;
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}
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/**
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* bvsnprintf - BIRD's vsnprintf()
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* @buf: destination buffer
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* @size: size of the buffer
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* @fmt: format string
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* @args: a list of arguments to be formatted
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*
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* This functions acts like ordinary sprintf() except that it checks available
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* space to avoid buffer overflows and it allows some more format specifiers:
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* |%I| for formatting of IP addresses (width of 1 is automatically replaced by
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* standard IP address width which depends on whether we use IPv4 or IPv6; |%I4|
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* or |%I6| can be used for explicit ip4_addr / ip6_addr arguments, |%N| for
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* generic network addresses (net_addr *), |%R| for Router / Network ID (u32
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* value printed as IPv4 address) and |%m| resp. |%M| for error messages (uses
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* strerror() to translate @errno code to message text). On the other hand, it
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* doesn't support floating point numbers.
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*
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* Result: number of characters of the output string or -1 if
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* the buffer space was insufficient.
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*/
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int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
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{
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int len;
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unsigned long num;
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int i, base;
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u32 x;
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char *str, *start;
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const char *s;
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char ipbuf[NET_MAX_TEXT_LENGTH+1];
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struct iface *iface;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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for (start=str=buf ; *fmt ; ++fmt, size-=(str-start), start=str) {
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if (*fmt != '%') {
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if (!size)
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return -1;
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*str++ = *fmt;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-': flags |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= SPECIAL; goto repeat;
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case '0': flags |= ZEROPAD; goto repeat;
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}
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/* get field width */
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field_width = -1;
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if (is_digit(*fmt))
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (is_digit(*fmt))
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
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qualifier = *fmt;
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++fmt;
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}
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/* default base */
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base = 10;
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if (field_width > size)
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return -1;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT))
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while (--field_width > 0)
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*str++ = ' ';
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*str++ = (byte) va_arg(args, int);
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while (--field_width > 0)
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*str++ = ' ';
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continue;
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case 'm':
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if (flags & SPECIAL) {
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if (!errno)
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continue;
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if (size < 2)
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return -1;
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*str++ = ':';
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*str++ = ' ';
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start += 2;
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size -= 2;
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}
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s = strerror(errno);
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goto str;
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case 'M':
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s = strerror(va_arg(args, int));
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goto str;
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case 'N': {
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net_addr *n = va_arg(args, net_addr *);
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if (field_width == 1)
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field_width = net_max_text_length[n->type];
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net_format(n, ipbuf, sizeof(ipbuf));
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s = ipbuf;
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goto str;
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}
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case 's':
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s = va_arg(args, char *);
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if (!s)
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s = "<NULL>";
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str:
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len = strlen(s);
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if (precision >= 0 && len > precision)
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len = precision;
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if (len > size)
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return -1;
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if (!(flags & LEFT))
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while (len < field_width--)
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*str++ = ' ';
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for (i = 0; i < len; ++i)
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*str++ = *s++;
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while (len < field_width--)
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*str++ = ' ';
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continue;
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case 'p':
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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flags |= ZEROPAD;
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}
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str = number(str,
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(unsigned long) va_arg(args, void *), 16,
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field_width, precision, flags, size);
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if (!str)
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return -1;
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continue;
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case 'n':
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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*ip = (str - buf);
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} else {
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int * ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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/* IP address */
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case 'I':
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if (fmt[1] == '4') {
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/* Explicit IPv4 address */
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ip4_addr a = va_arg(args, ip4_addr);
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ip4_ntop(a, ipbuf);
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i = IP4_MAX_TEXT_LENGTH;
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fmt++;
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} else if (fmt[1] == '6') {
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/* Explicit IPv6 address */
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ip6_addr a = va_arg(args, ip6_addr);
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ip6_ntop(a, ipbuf);
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i = IP6_MAX_TEXT_LENGTH;
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fmt++;
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} else {
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/* Just IP address */
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ip_addr a = va_arg(args, ip_addr);
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if (ipa_is_ip4(a)) {
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ip4_ntop(ipa_to_ip4(a), ipbuf);
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i = IP4_MAX_TEXT_LENGTH;
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} else {
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ip6_ntop(ipa_to_ip6(a), ipbuf);
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i = IP6_MAX_TEXT_LENGTH;
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}
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}
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s = ipbuf;
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if (field_width == 1)
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field_width = i;
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goto str;
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/* Interface scope after link-local IP address */
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case 'J':
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iface = va_arg(args, struct iface *);
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if (!iface)
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continue;
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if (!size)
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return -1;
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*str++ = '%';
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start++;
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size--;
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s = iface->name;
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goto str;
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/* Router/Network ID - essentially IPv4 address in u32 value */
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case 'R':
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x = va_arg(args, u32);
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ip4_ntop(ip4_from_u32(x), ipbuf);
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s = ipbuf;
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goto str;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'X':
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flags |= LARGE;
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case 'x':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= SIGN;
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case 'u':
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break;
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default:
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if (size < 2)
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return -1;
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if (*fmt != '%')
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*str++ = '%';
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if (*fmt)
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*str++ = *fmt;
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else
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--fmt;
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continue;
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}
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if (qualifier == 'l')
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num = va_arg(args, unsigned long);
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else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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if (flags & SIGN)
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num = (short) num;
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} else if (flags & SIGN)
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num = va_arg(args, int);
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else
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num = va_arg(args, uint);
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str = number(str, num, base, field_width, precision, flags, size);
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if (!str)
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return -1;
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}
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if (!size)
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return -1;
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*str = '\0';
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return str-buf;
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}
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/**
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* bvsprintf - BIRD's vsprintf()
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* @buf: buffer
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* @fmt: format string
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* @args: a list of arguments to be formatted
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*
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* This function is equivalent to bvsnprintf() with an infinite
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* buffer size. Please use carefully only when you are absolutely
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* sure the buffer won't overflow.
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*/
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int bvsprintf(char *buf, const char *fmt, va_list args)
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{
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return bvsnprintf(buf, 1000000000, fmt, args);
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}
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/**
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* bsprintf - BIRD's sprintf()
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* @buf: buffer
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* @fmt: format string
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*
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* This function is equivalent to bvsnprintf() with an infinite
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* buffer size and variable arguments instead of a &va_list.
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* Please use carefully only when you are absolutely
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* sure the buffer won't overflow.
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*/
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int bsprintf(char * buf, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=bvsnprintf(buf, 1000000000, fmt, args);
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va_end(args);
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return i;
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}
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/**
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* bsnprintf - BIRD's snprintf()
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* @buf: buffer
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* @size: buffer size
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* @fmt: format string
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*
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* This function is equivalent to bsnprintf() with variable arguments instead of a &va_list.
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*/
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int bsnprintf(char * buf, int size, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=bvsnprintf(buf, size, fmt, args);
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va_end(args);
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return i;
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}
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int
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buffer_vprint(buffer *buf, const char *fmt, va_list args)
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{
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int i = bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
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buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
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return i;
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}
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int
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buffer_print(buffer *buf, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
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va_end(args);
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buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
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return i;
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}
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void
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buffer_puts(buffer *buf, const char *str)
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{
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byte *bp = buf->pos;
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byte *be = buf->end;
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while (bp < be && *str)
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*bp++ = *str++;
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if (bp < be)
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*bp = 0;
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buf->pos = bp;
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}
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