mirror of
https://gitlab.nic.cz/labs/bird.git
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413 lines
8.6 KiB
C
413 lines
8.6 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
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* available space to avoid buffer overflows and it allows some more
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* format specifiers: |%I| for formatting of IP addresses (any non-zero
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* width is automatically replaced by standard IP address width which
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* depends on whether we use IPv4 or IPv6; |%#I| gives hexadecimal format),
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* |%R| for Router / Network ID (u32 value printed as IPv4 address)
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* and |%m| resp. |%M| for error messages (uses strerror() to translate @errno code to
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* message text). On the other hand, it doesn't support floating
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* 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[STD_ADDRESS_P_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++ = (unsigned char) 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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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 '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 (flags & SPECIAL)
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ip_ntox(va_arg(args, ip_addr), ipbuf);
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else {
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ip_ntop(va_arg(args, ip_addr), ipbuf);
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if (field_width > 0)
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field_width = STD_ADDRESS_P_LENGTH;
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}
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s = ipbuf;
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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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bsprintf(ipbuf, "%d.%d.%d.%d",
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((x >> 24) & 0xff),
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((x >> 16) & 0xff),
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((x >> 8) & 0xff),
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(x & 0xff));
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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, unsigned int);
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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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