/*
* BIRD Library -- Formatted Output
*
* (c) 1991, 1992 Lars Wirzenius & Linus Torvalds
*
* Hacked up for BIRD by Martin Mares <mj@ucw.cz>
* Buffer size limitation implemented by Martin Mares.
*/
#include "nest/bird.h"
#include "string.h"
#include <errno.h>
#include "nest/iface.h"
/* we use this so that we can do without the ctype library */
#define is_digit(c) ((c) >= '0' && (c) <= '9')
static int skip_atoi(const char **s)
{
int i=0;
while (is_digit(**s))
i = i*10 + *((*s)++) - '0';
return i;
}
#define ZEROPAD 1 /* pad with zero */
#define SIGN 2 /* unsigned/signed long */
#define PLUS 4 /* show plus */
#define SPACE 8 /* space if plus */
#define LEFT 16 /* left justified */
#define SPECIAL 32 /* 0x */
#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
static char * number(char * str, u64 num, uint base, int size, int precision,
int type, int remains)
{
char c,sign,tmp[66];
const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
int i;
if (size >= 0 && (remains -= size) < 0)
return NULL;
if (type & LARGE)
digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
if (type & LEFT)
type &= ~ZEROPAD;
if (base < 2 || base > 36)
return 0;
c = (type & ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & SIGN) {
if (num > (u64) INT64_MAX) {
sign = '-';
num = -num;
size--;
} else if (type & PLUS) {
sign = '+';
size--;
} else if (type & SPACE) {
sign = ' ';
size--;
}
}
if (type & SPECIAL) {
if (base == 16)
size -= 2;
else if (base == 8)
size--;
}
i = 0;
if (num == 0)
tmp[i++]='0';
else while (num != 0) {
uint res = num % base;
num = num / base;
tmp[i++] = digits[res];
}
if (i > precision)
precision = i;
size -= precision;
if (size < 0 && -size > remains)
return NULL;
if (!(type&(ZEROPAD+LEFT)))
while(size-->0)
*str++ = ' ';
if (sign)
*str++ = sign;
if (type & SPECIAL) {
if (base==8)
*str++ = '0';
else if (base==16) {
*str++ = '0';
*str++ = digits[33];
}
}
if (!(type & LEFT))
while (size-- > 0)
*str++ = c;
while (i < precision--)
*str++ = '0';
while (i-- > 0)
*str++ = tmp[i];
while (size-- > 0)
*str++ = ' ';
return str;
}
/**
* bvsnprintf - BIRD's vsnprintf()
* @buf: destination buffer
* @size: size of the buffer
* @fmt: format string
* @args: a list of arguments to be formatted
*
* This functions acts like ordinary sprintf() except that it checks available
* space to avoid buffer overflows and it allows some more format specifiers:
* |%I| for formatting of IP addresses (width of 1 is automatically replaced by
* standard IP address width which depends on whether we use IPv4 or IPv6; |%I4|
* or |%I6| can be used for explicit ip4_addr / ip6_addr arguments, |%N| for
* generic network addresses (net_addr *), |%R| for Router / Network ID (u32
* value printed as IPv4 address), |%lR| for 64bit Router / Network ID (u64
* value printed as eight :-separated octets), |%t| for time values (btime) with
* specified subsecond precision, and |%m| resp. |%M| for error messages (uses
* strerror() to translate @errno code to message text). On the other hand, it
* doesn't support floating point numbers. The bvsnprintf() supports |%h| and
* |%l| qualifiers, but |%l| is used for s64/u64 instead of long/ulong.
*
* Result: number of characters of the output string or -1 if
* the buffer space was insufficient.
*/
int bvsnprintf(char *buf, int size, const char *fmt, va_list args)
{
int len, i;
u64 num;
uint base;
u32 x;
u64 X;
btime t;
s64 t1, t2;
char *str, *start;
const char *s;
char ipbuf[NET_MAX_TEXT_LENGTH+1];
struct iface *iface;
int flags; /* flags to number() */
int field_width; /* width of output field */
int precision; /* min. # of digits for integers; max
number of chars for from string */
int qualifier; /* 'h' or 'l' for integer fields */
for (start=str=buf ; *fmt ; ++fmt, size-=(str-start), start=str) {
if (*fmt != '%') {
if (!size)
return -1;
*str++ = *fmt;
continue;
}
/* process flags */
flags = 0;
repeat:
++fmt; /* this also skips first '%' */
switch (*fmt) {
case '-': flags |= LEFT; goto repeat;
case '+': flags |= PLUS; goto repeat;
case ' ': flags |= SPACE; goto repeat;
case '#': flags |= SPECIAL; goto repeat;
case '0': flags |= ZEROPAD; goto repeat;
}
/* get field width */
field_width = -1;
if (is_digit(*fmt))
field_width = skip_atoi(&fmt);
else if (*fmt == '*') {
++fmt;
/* it's the next argument */
field_width = va_arg(args, int);
if (field_width < 0) {
field_width = -field_width;
flags |= LEFT;
}
}
/* get the precision */
precision = -1;
if (*fmt == '.') {
++fmt;
if (is_digit(*fmt))
precision = skip_atoi(&fmt);
else if (*fmt == '*') {
++fmt;
/* it's the next argument */
precision = va_arg(args, int);
}
if (precision < 0)
precision = 0;
}
/* get the conversion qualifier */
qualifier = -1;
if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
qualifier = *fmt;
++fmt;
}
/* default base */
base = 10;
if (field_width > size)
return -1;
switch (*fmt) {
case 'c':
if (!(flags & LEFT))
while (--field_width > 0)
*str++ = ' ';
*str++ = (byte) va_arg(args, int);
while (--field_width > 0)
*str++ = ' ';
continue;
case 'm':
if (flags & SPECIAL) {
if (!errno)
continue;
if (size < 2)
return -1;
*str++ = ':';
*str++ = ' ';
start += 2;
size -= 2;
}
s = strerror(errno);
goto str;
case 'M':
s = strerror(va_arg(args, int));
goto str;
case 'N': {
net_addr *n = va_arg(args, net_addr *);
if (field_width == 1)
field_width = net_max_text_length[n->type];
net_format(n, ipbuf, sizeof(ipbuf));
s = ipbuf;
goto str;
}
case 's':
s = va_arg(args, char *);
if (!s)
s = "<NULL>";
str:
len = strlen(s);
if (precision >= 0 && len > precision)
len = precision;
if (len > size)
return -1;
if (!(flags & LEFT))
while (len < field_width--)
*str++ = ' ';
for (i = 0; i < len; ++i)
*str++ = *s++;
while (len < field_width--)
*str++ = ' ';
continue;
case 'V': {
const char *vfmt = va_arg(args, const char *);
va_list *vargs = va_arg(args, va_list *);
int res = bvsnprintf(str, size, vfmt, *vargs);
if (res < 0)
return -1;
str += res;
size -= res;
continue;
}
case 'p':
if (field_width == -1) {
field_width = 2*sizeof(void *);
flags |= ZEROPAD;
}
str = number(str, (uintptr_t) va_arg(args, void *), 16,
field_width, precision, flags, size);
if (!str)
return -1;
continue;
case 'n':
if (qualifier == 'l') {
s64 * ip = va_arg(args, s64 *);
*ip = (str - buf);
} else {
int * ip = va_arg(args, int *);
*ip = (str - buf);
}
continue;
/* IP address */
case 'I':
if (fmt[1] == '4') {
/* Explicit IPv4 address */
ip4_addr a = va_arg(args, ip4_addr);
ip4_ntop(a, ipbuf);
i = IP4_MAX_TEXT_LENGTH;
fmt++;
} else if (fmt[1] == '6') {
/* Explicit IPv6 address */
ip6_addr a = va_arg(args, ip6_addr);
ip6_ntop(a, ipbuf);
i = IP6_MAX_TEXT_LENGTH;
fmt++;
} else {
/* Just IP address */
ip_addr a = va_arg(args, ip_addr);
if (ipa_is_ip4(a)) {
ip4_ntop(ipa_to_ip4(a), ipbuf);
i = IP4_MAX_TEXT_LENGTH;
} else {
ip6_ntop(ipa_to_ip6(a), ipbuf);
i = IP6_MAX_TEXT_LENGTH;
}
}
s = ipbuf;
if (field_width == 1)
field_width = i;
goto str;
/* Interface scope after link-local IP address */
case 'J':
iface = va_arg(args, struct iface *);
if (!iface)
continue;
if (!size)
return -1;
*str++ = '%';
start++;
size--;
s = iface->name;
goto str;
/* Router/Network ID - essentially IPv4 address in u32 value */
case 'R':
if (qualifier == 'l') {
X = va_arg(args, u64);
bsprintf(ipbuf, "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
(uint) ((X >> 56) & 0xff),
(uint) ((X >> 48) & 0xff),
(uint) ((X >> 40) & 0xff),
(uint) ((X >> 32) & 0xff),
(uint) ((X >> 24) & 0xff),
(uint) ((X >> 16) & 0xff),
(uint) ((X >> 8) & 0xff),
(uint) (X & 0xff));
}
else
{
x = va_arg(args, u32);
ip4_ntop(ip4_from_u32(x), ipbuf);
}
s = ipbuf;
goto str;
case 't':
t = va_arg(args, btime);
t1 = t TO_S;
t2 = t - t1 S;
if (precision < 0)
precision = 3;
if (precision > 6)
precision = 6;
/* Compute field_width for second part */
if ((precision > 0) && (field_width > 0))
field_width -= (1 + precision);
if (field_width < 0)
field_width = 0;
/* Print seconds */
flags |= SIGN;
str = number(str, (u64) t1, 10, field_width, 0, flags, size);
if (!str)
return -1;
if (precision > 0)
{
size -= (str-start);
start = str;
if ((1 + precision) > size)
return -1;
/* Convert microseconds to requested precision */
for (i = precision; i < 6; i++)
t2 /= 10;
/* Print sub-seconds */
*str++ = '.';
str = number(str, (u64) t2, 10, precision, 0, ZEROPAD, size - 1);
if (!str)
return -1;
}
goto done;
/* integer number formats - set up the flags and "break" */
case 'o':
base = 8;
break;
case 'X':
flags |= LARGE;
/* fallthrough */
case 'x':
base = 16;
break;
case 'd':
case 'i':
flags |= SIGN;
case 'u':
break;
default:
if (size < 2)
return -1;
if (*fmt != '%')
*str++ = '%';
if (*fmt)
*str++ = *fmt;
else
--fmt;
continue;
}
if (flags & SIGN) {
/* Conversions valid per ISO C99 6.3.1.3 (2) */
if (qualifier == 'l')
num = (u64) va_arg(args, s64);
else if (qualifier == 'h')
num = (u64) (short) va_arg(args, int);
else
num = (u64) va_arg(args, int);
} else {
if (qualifier == 'l')
num = va_arg(args, u64);
else if (qualifier == 'h')
num = (unsigned short) va_arg(args, int);
else
num = va_arg(args, uint);
}
str = number(str, num, base, field_width, precision, flags, size);
if (!str)
return -1;
done: ;
}
if (!size)
return -1;
*str = '\0';
return str-buf;
}
/**
* bvsprintf - BIRD's vsprintf()
* @buf: buffer
* @fmt: format string
* @args: a list of arguments to be formatted
*
* This function is equivalent to bvsnprintf() with an infinite
* buffer size. Please use carefully only when you are absolutely
* sure the buffer won't overflow.
*/
int bvsprintf(char *buf, const char *fmt, va_list args)
{
return bvsnprintf(buf, 1000000000, fmt, args);
}
/**
* bsprintf - BIRD's sprintf()
* @buf: buffer
* @fmt: format string
*
* This function is equivalent to bvsnprintf() with an infinite
* buffer size and variable arguments instead of a &va_list.
* Please use carefully only when you are absolutely
* sure the buffer won't overflow.
*/
int bsprintf(char * buf, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=bvsnprintf(buf, 1000000000, fmt, args);
va_end(args);
return i;
}
/**
* bsnprintf - BIRD's snprintf()
* @buf: buffer
* @size: buffer size
* @fmt: format string
*
* This function is equivalent to bsnprintf() with variable arguments instead of a &va_list.
*/
int bsnprintf(char * buf, int size, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=bvsnprintf(buf, size, fmt, args);
va_end(args);
return i;
}
int
buffer_vprint(buffer *buf, const char *fmt, va_list args)
{
int i = bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
if ((i < 0) && (buf->pos < buf->end))
*buf->pos = 0;
buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
return i;
}
int
buffer_print(buffer *buf, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i = bvsnprintf((char *) buf->pos, buf->end - buf->pos, fmt, args);
va_end(args);
if ((i < 0) && (buf->pos < buf->end))
*buf->pos = 0;
buf->pos = (i >= 0) ? (buf->pos + i) : buf->end;
return i;
}
void
buffer_puts(buffer *buf, const char *str)
{
byte *bp = buf->pos;
byte *be = buf->end - 1;
while (bp < be && *str)
*bp++ = *str++;
if (bp <= be)
*bp = 0;
buf->pos = (bp < be) ? bp : buf->end;
}
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