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/* -*- linux-c -*-
* vsprintf.c
* Copyright (C) 2006, 2008-2019 Red Hat Inc.
* Based on code from the Linux kernel
* Copyright (C) 1991, 1992 Linus Torvalds
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
#ifndef _VSPRINTF_C_
#define _VSPRINTF_C_
#include "print.h"
static int skip_atoi(const char **s)
{
int i=0;
while (isdigit(**s))
i = i*10 + *((*s)++) - '0';
return i;
}
/*
* Changes to number() will require a corresponding change to number_size below,
* to ensure proper buffer allocation for _stp_printf.
*/
noinline static char *
number(char * buf, char * end, uint64_t num, int base, int size, int precision, enum print_flag type)
{
char c,sign,tmp[66];
const char *digits;
static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i;
digits = (type & STP_LARGE) ? large_digits : small_digits;
if (type & STP_LEFT)
type &= ~STP_ZEROPAD;
if (base < 2 || base > 36)
return NULL;
c = (type & STP_ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & STP_SIGN) {
if ((int64_t) num < 0) {
sign = '-';
num = - (int64_t) num;
size--;
} else if (type & STP_PLUS) {
sign = '+';
size--;
} else if (type & STP_SPACE) {
sign = ' ';
size--;
}
}
if (type & STP_SPECIAL) {
if (base == 16)
size -= 2;
else if (base == 8)
size--;
}
i = 0;
if (num == 0)
tmp[i++]='0';
else while (num != 0)
tmp[i++] = digits[do_div(num,base)];
if (i > precision)
precision = i;
size -= precision;
if (!(type&(STP_ZEROPAD+STP_LEFT))) {
while(size-->0) {
if (buf <= end)
*buf = ' ';
++buf;
}
}
if (sign) {
if (buf <= end)
*buf = sign;
++buf;
}
if (type & STP_SPECIAL) {
if (base==8) {
if (buf <= end)
*buf = '0';
++buf;
} else if (base==16) {
if (buf <= end)
*buf = '0';
++buf;
if (buf <= end)
*buf = digits[33];
++buf;
}
}
if (!(type & STP_LEFT)) {
while (size-- > 0) {
if (buf <= end)
*buf = c;
++buf;
}
}
while (i < precision--) {
if (buf <= end)
*buf = '0';
++buf;
}
while (i-- > 0) {
if (buf <= end)
*buf = tmp[i];
++buf;
}
while (size-- > 0) {
if (buf <= end)
*buf = ' ';
++buf;
}
return buf;
}
/*
* Calculates the number of bytes required to print the paramater num. A change to
* number() requires a corresponding change here, and vice versa, to ensure the
* calculated size and printed size match.
*/
noinline static int
number_size(uint64_t num, int base, int size, int precision, enum print_flag type) {
char c,sign,tmp[66];
const char *digits;
static const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
static const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i, num_bytes = 0;
digits = (type & STP_LARGE) ? large_digits : small_digits;
if (type & STP_LEFT)
type &= ~STP_ZEROPAD;
if (base < 2 || base > 36)
return 0;
c = (type & STP_ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & STP_SIGN) {
if ((int64_t) num < 0) {
sign = '-';
num = - (int64_t) num;
size--;
} else if (type & STP_PLUS) {
sign = '+';
size--;
} else if (type & STP_SPACE) {
sign = ' ';
size--;
}
}
if (type & STP_SPECIAL) {
if (base == 16)
size -= 2;
else if (base == 8)
size--;
}
i = 0;
if (num == 0)
tmp[i++]='0';
else while (num != 0)
tmp[i++] = digits[do_div(num,base)];
if (i > precision)
precision = i;
size -= precision;
if (!(type&(STP_ZEROPAD+STP_LEFT))) {
while(size-->0) {
num_bytes++;
}
}
if (sign) {
num_bytes++;
}
if (type & STP_SPECIAL) {
if (base==8) {
num_bytes++;
} else if (base==16) {
num_bytes+=2;
}
}
if (!(type & STP_LEFT)) {
while (size-- > 0) {
num_bytes++;
}
}
while (i < precision--) {
num_bytes++;
}
while (i-- > 0) {
num_bytes++;
}
while (size-- > 0) {
num_bytes++;
}
return num_bytes;
}
/*
* Output one character into the buffer. Usually this is just a
* straight copy, padded left or right up to 'width', but if the user
* gave the '#' flag then we need to escape special characters.
*/
noinline static char *
_stp_vsprint_char(char * str, char * end, char c,
int width, enum print_flag flags)
{
int size = _stp_vsprint_char_size(c, 0, flags);
if (!(flags & STP_LEFT)) {
while (width-- > size) {
if (str <= end)
*str = ' ';
++str;
}
}
if (size == 1) {
if (str <= end)
*str = c;
++str;
}
else {
/* Other sizes mean this is not a printable character.
* First try to match up C escape characters: */
char escape = 0;
switch (c) {
case '\a':
escape = 'a';
break;
case '\b':
escape = 'b';
break;
case '\f':
escape = 'f';
break;
case '\n':
escape = 'n';
break;
case '\r':
escape = 'r';
break;
case '\t':
escape = 't';
break;
case '\v':
escape = 'v';
break;
case '\'':
escape = '\'';
break;
case '\\':
escape = '\\';
break;
}
if (str <= end)
*str = '\\';
++str;
if (escape) {
if (str <= end)
*str = escape;
++str;
}
else {
/* Fall back to octal for everything else */
if (str <= end)
*str = to_oct_digit((c >> 6) & 03);
++str;
if (str <= end)
*str = to_oct_digit((c >> 3) & 07);
++str;
if (str <= end)
*str = to_oct_digit(c & 07);
++str;
}
}
while (width-- > size) {
if (str <= end)
*str = ' ';
++str;
}
return str;
}
/*
* Compute the size of a given character in the buffer. Usually this is
* just 1 (padded up to 'width'), but if the user gave the '#' flag then
* we need to escape special characters.
*/
noinline static int
_stp_vsprint_char_size(char c, int width, enum print_flag flags)
{
int size = 1;
/* look for quoteworthy characters */
if ((flags & STP_SPECIAL) &&
(!(isprint(c) && isascii(c)) || c == '\'' || c == '\\'))
switch (c) {
case '\a':
case '\b':
case '\f':
case '\n':
case '\r':
case '\t':
case '\v':
case '\'':
case '\\':
/* backslash and one escape character */
size = 2;
break;
default:
/* backslash and three octal digits */
size = 4;
break;
}
return max(size, width);
}
noinline static char *
_stp_vsprint_memory(char * str, char * end, const char * ptr,
int width, int precision,
char format, enum print_flag flags)
{
int i, len = 0;
struct context * __restrict__ c;
if (format == 's') {
if ((unsigned long)ptr < PAGE_SIZE)
ptr = "<NULL>";
len = strnlen(ptr, precision);
}
else if (precision > 0)
len = precision;
else
len = 1;
if (!(flags & STP_LEFT)) {
int actlen = len;
if (format == 'M')
actlen = len * 2;
while (actlen < width-- && str <= end)
*str++ = ' ';
}
if (format == 'M') { /* stolen from kernel: trace_seq_putmem_hex() */
static const char _stp_hex_asc[] = "0123456789abcdef";
/* PR13386: Skip if called with null context */
c = _stp_runtime_get_context();
if (c) for (i = 0; i < len && str < end; i++) {
unsigned char c_tmp;
if (flags & STP_SPECIAL)
c_tmp = uread((unsigned char *)(ptr));
else
c_tmp = kread((unsigned char *)(ptr));
ptr++;
*str++ = _stp_hex_asc[(c_tmp & 0xf0) >> 4];
*str++ = _stp_hex_asc[(c_tmp & 0x0f)];
}
len = len * 2; /* the actual length */
}
else if (format == 'm') {
/* PR13386: Skip if called with null context */
c = _stp_runtime_get_context();
if (c) for (i = 0; i < len && str <= end; ++i) {
if (flags & STP_SPECIAL)
*str++ = uread((unsigned char *)(ptr));
else
*str++ = kread((unsigned char *)(ptr));
ptr++;
}
}
else /* %s format */
for (i = 0; i < len && str <= end; ++i)
*str++ = *ptr++;
while (len < width-- && str <= end)
*str++ = ' ';
if (flags & STP_ZEROPAD && str <= end)
*str++ = '\0';
return str;
/* We've caught a deref fault. Make sure the string is null
* terminated. and return. */
deref_fault:
if (str <= end)
*str = '\0';
return NULL;
}
noinline static int
_stp_vsprint_memory_size(const char * ptr, int width, int precision,
char format, enum print_flag flags)
{
int len = 0;
if (format == 's') {
if ((unsigned long)ptr < PAGE_SIZE)
ptr = "<NULL>";
len = strnlen(ptr, precision);
}
else if (precision > 0)
len = precision;
else
len = 1;
if (format == 'M')
len = len * 2; /* hex dump print size */
len = max(len, width);
if (flags & STP_ZEROPAD)
len++;
return len;
}
static int check_binary_precision (int precision) {
/* precision can be unspecified (-1) or one of 1, 2, 4 or 8. */
switch (precision) {
case -1:
case 1:
case 2:
case 4:
case 8:
break;
default:
precision = -1;
break;
}
return precision;
}
noinline static char *
_stp_vsprint_binary(char * str, char * end, int64_t num,
int width, int precision, enum print_flag flags)
{
/* Only certain values are valid for the precision. */
precision = check_binary_precision (precision);
/* Unspecified field width defaults to the specified
precision and vice versa. If neither is specified,
then both default to 8. */
if (width == -1) {
if (precision == -1) {
width = 8;
precision = 8;
}
else
width = precision;
}
else if (precision == -1) {
precision = check_binary_precision (width);
if (precision == -1)
precision = 8;
}
if (!(flags & STP_LEFT))
while (precision < width-- && str <= end)
*str++ = '\0';
if ((str + precision - 1) <= end) {
#ifdef __ia64__
memcpy(str, &num, precision); //to prevent unaligned access
#else
switch(precision) {
case 1:
*(int8_t *)str = (int8_t)num;
break;
case 2:
*(int16_t *)str = (int16_t)num;
break;
case 4:
*(int32_t *)str = (int32_t)num;
break;
default: // "%.8b" by default
case 8:
*(int64_t *)str = num;
break;
}
#endif
str += precision;
}
/* >= 0 tests to avoid compiler worrying about signed-overflows */
while (precision >= 0 && width >= 0 && precision < width-- && str <= end)
*str++ = '\0';
return str;
}
noinline static int
_stp_vsprint_binary_size(int64_t num, int width, int precision)
{
/* Only certain values are valid for the precision. */
precision = check_binary_precision (precision);
/* Unspecified field width defaults to the specified
precision and vice versa. If neither is specified,
then both default to 8. */
if (width == -1) {
if (precision == -1) {
width = 8;
precision = 8;
}
else
width = precision;
}
else if (precision == -1) {
precision = check_binary_precision (width);
if (precision == -1)
precision = 8;
}
return max(precision, width);
}
noinline static int
_stp_vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
int len;
uint64_t num;
int i, base;
char *str = NULL, *end = NULL, c;
const char *s;
enum print_flag 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', 'l', or 'L' for integer fields */
int num_bytes = 0;
unsigned long irqflags = 0;
bool got_print_lock = false;
/* Reject out-of-range values early */
if (unlikely((int) size < 0))
return 0;
/*
* buf will be NULL when this function is called from _stp_printf.
* This branch calculates the exact size print buffer required for
* the string and allocates it with _stp_reserve_bytes. A change
* to this branch requires a corresponding change to the same
* section of code below.
*/
if (buf == NULL) {
const char* fmt_copy = fmt;
va_list args_copy;
va_copy(args_copy, args);
for (; *fmt_copy ; ++fmt_copy) {
if (*fmt_copy != '%') {
num_bytes++;
continue;
}
/* process flags */
flags = 0;
repeat_copy:
++fmt_copy; /* this also skips first '%' */
switch (*fmt_copy) {
case '-': flags |= STP_LEFT; goto repeat_copy;
case '+': flags |= STP_PLUS; goto repeat_copy;
case ' ': flags |= STP_SPACE; goto repeat_copy;
case '#': flags |= STP_SPECIAL; goto repeat_copy;
case '0': flags |= STP_ZEROPAD; goto repeat_copy;
}
/* get field width */
field_width = -1;
if (isdigit(*fmt_copy))
field_width = clamp(skip_atoi(&fmt_copy), 0, STP_BUFFER_SIZE);
else if (*fmt_copy == '*') {
++fmt_copy;
/* it's the next argument */
field_width = va_arg(args_copy, int);
if (field_width < 0) {
field_width = -field_width;
flags |= STP_LEFT;
}
field_width = clamp(field_width, 0, STP_BUFFER_SIZE);
}
/* get the precision */
precision = -1;
if (*fmt_copy == '.') {
++fmt_copy;
if (isdigit(*fmt_copy))
precision = skip_atoi(&fmt_copy);
else if (*fmt_copy == '*') {
++fmt_copy;
/* it's the next argument */
precision = va_arg(args_copy, int);
}
precision = clamp(precision, 0, STP_BUFFER_SIZE);
}
/* get the conversion qualifier */
qualifier = -1;
if (*fmt_copy == 'h' || *fmt_copy == 'l' || *fmt_copy == 'L') {
qualifier = *fmt_copy;
++fmt_copy;
if (qualifier == 'l' && *fmt_copy == 'l') {
qualifier = 'L';
++fmt_copy;
}
}
/* default base */
base = 10;
switch (*fmt_copy) {
case 'b':
num = va_arg(args_copy, int64_t);
num_bytes += _stp_vsprint_binary_size(num,
field_width, precision);
continue;
case 's':
case 'M':
case 'm':
s = va_arg(args_copy, char *);
num_bytes += _stp_vsprint_memory_size(s,
field_width, precision,
*fmt_copy, flags);
continue;
case 'X':
flags |= STP_LARGE;
/* fallthru */
case 'x':
base = 16;
break;
case 'd':
case 'i':
flags |= STP_SIGN;
/* fallthru */
case 'u':
break;
case 'p':
/* Note that %p takes an int64_t argument. */
qualifier = 'L';
/* Since stap 1.3, %p == %#x. */
flags |= STP_SPECIAL;
base = 16;
#if STAP_COMPAT_VERSION < STAP_VERSION(1,3)
/* Before 1.3, %p was an odd child; see below. */
qualifier = 'P';
if (field_width == -1)
field_width = 2 + 2*sizeof(void*);
precision = field_width - 2;
if (!(flags & STP_LEFT))
precision = min_t(int, precision, 2*sizeof(void*));
#endif
break;
case '%':
num_bytes++;
continue;
/* integer number formats - set up the flags and "break" */
case 'o':
base = 8;
break;
case 'c':
c = (unsigned char) va_arg(args_copy, int);
num_bytes += _stp_vsprint_char_size(c, field_width, flags);
continue;
default:
num_bytes++;
if (*fmt_copy) {
num_bytes++;
} else {
--fmt_copy;
}
continue;
}
if (qualifier == 'L')
num = va_arg(args_copy, int64_t);
else if (qualifier == 'P') // fake, just for compat %p
num = (unsigned long) va_arg(args_copy, int64_t);
else if (qualifier == 'l') {
num = va_arg(args_copy, unsigned long);
if (flags & STP_SIGN)
num = (signed long) num;
} else if (qualifier == 'h') {
num = (unsigned short) va_arg(args_copy, int);
if (flags & STP_SIGN)
num = (signed short) num;
} else {
num = va_arg(args_copy, unsigned int);
if (flags & STP_SIGN)
num = (signed int) num;
}
num_bytes += number_size(num, base, field_width, precision, flags);
}
va_end(args_copy);
if (num_bytes == 0)
return 0;
//max print buffer size
if (num_bytes > STP_BUFFER_SIZE) {
num_bytes = STP_BUFFER_SIZE;
}
if (!_stp_print_trylock_irqsave(&irqflags))
return 0;
str = (char*)_stp_reserve_bytes(num_bytes);
if (str == NULL) {
_stp_error("Couldn't reserve any print buffer space\n");
goto err_unlock;
}
got_print_lock = true;
size = num_bytes;
end = str + size - 1;
} else {
str = buf;
end = buf + size - 1;
}
/*
* Note that a change to code below requires a corresponding
* change in the code above to properly calculate the bytes
* required in the output buffer.
*/
for (; *fmt ; ++fmt) {
if (*fmt != '%') {
if (str <= end)
*str = *fmt;
++str;
continue;
}
/* process flags */
flags = 0;
repeat:
++fmt; /* this also skips first '%' */
switch (*fmt) {
case '-': flags |= STP_LEFT; goto repeat;
case '+': flags |= STP_PLUS; goto repeat;
case ' ': flags |= STP_SPACE; goto repeat;
case '#': flags |= STP_SPECIAL; goto repeat;
case '0': flags |= STP_ZEROPAD; goto repeat;
}
/* get field width */
field_width = -1;
if (isdigit(*fmt))
field_width = clamp(skip_atoi(&fmt), 0, (int)size);
else if (*fmt == '*') {
++fmt;
/* it's the next argument */
field_width = va_arg(args, int);
if (field_width < 0) {
field_width = -field_width;
flags |= STP_LEFT;
}
field_width = clamp(field_width, 0, (int)size);
}
/* get the precision */
precision = -1;
if (*fmt == '.') {
++fmt;
if (isdigit(*fmt))
precision = skip_atoi(&fmt);
else if (*fmt == '*') {
++fmt;
/* it's the next argument */
precision = va_arg(args, int);
}
precision = clamp(precision, 0, (int)size);
}
/* get the conversion qualifier */
qualifier = -1;
if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
qualifier = *fmt;
++fmt;
if (qualifier == 'l' && *fmt == 'l') {
qualifier = 'L';
++fmt;
}
}
/* default base */
base = 10;
switch (*fmt) {
case 'b':
num = va_arg(args, int64_t);
str = _stp_vsprint_binary(str, end, num,
field_width, precision, flags);
continue;
case 's':
case 'M':
case 'm':
s = va_arg(args, char *);
str = _stp_vsprint_memory(str, end, s,
field_width, precision,
*fmt, flags);
if (unlikely(str == NULL)) {
if (num_bytes > 0) {
_stp_unreserve_bytes(num_bytes);
goto err_unlock;
}
return 0;
}
continue;
case 'X':
flags |= STP_LARGE;
/* fallthru */
case 'x':
base = 16;
break;
case 'd':
case 'i':
flags |= STP_SIGN;
/* fallthru */
case 'u':
break;
case 'p':
/* Note that %p takes an int64_t argument. */
qualifier = 'L';
/* Since stap 1.3, %p == %#x. */
flags |= STP_SPECIAL;
base = 16;
#if STAP_COMPAT_VERSION < STAP_VERSION(1,3)
/* Before 1.3, %p was an odd child:
* - the value is truncated to unsigned long
* - the specified precision is ignored
* - the default field_width is 2+2*sizeof(void*)
* - the effective precision is field_width - 2, except
* if !STP_LEFT, where it is at most 2*sizeof(void*)
*/
qualifier = 'P';
if (field_width == -1)
field_width = 2 + 2*sizeof(void*);
precision = field_width - 2;
if (!(flags & STP_LEFT))
precision = min_t(int, precision, 2*sizeof(void*));
#endif
break;
case '%':
if (str <= end)
*str = '%';
++str;
continue;
/* integer number formats - set up the flags and "break" */
case 'o':
base = 8;
break;
case 'c':
c = (unsigned char) va_arg(args, int);
str = _stp_vsprint_char(str, end, c, field_width, flags);
continue;
default:
if (str <= end)
*str = '%';
++str;
if (*fmt) {
if (str <= end)
*str = *fmt;
++str;
} else {
--fmt;
}
continue;
}
if (qualifier == 'L')
num = va_arg(args, int64_t);
else if (qualifier == 'P') // fake, just for compat %p
num = (unsigned long) va_arg(args, int64_t);
else if (qualifier == 'l') {
num = va_arg(args, unsigned long);
if (flags & STP_SIGN)
num = (signed long) num;
} else if (qualifier == 'h') {
num = (unsigned short) va_arg(args, int);
if (flags & STP_SIGN)
num = (signed short) num;
} else {
num = va_arg(args, unsigned int);
if (flags & STP_SIGN)
num = (signed int) num;
}
str = number(str, end, num, base,
field_width, precision, flags);
}
if (buf != NULL) {
if (likely(str <= end))
*str = '\0';
else if (size > 0)
/* don't write out a null byte if the buf size is zero */
*end = '\0';
}
if (got_print_lock)
_stp_print_unlock_irqrestore(&irqflags);
return str-buf;
err_unlock:
_stp_print_unlock_irqrestore(&irqflags);
return 0;
}
#endif /* _VSPRINTF_C_ */