Move to nostd printf and musl crates (#3188)

* Adopt nostd-printf

* Adopt nostd-musl

libafl_qemu/librasan/Justfile

@@ -82,11 +82,11 @@ build_everything_dev: \
   build_ppc_dev \
 
 build_everything_release: \
-  build_arm_dev \
+  build_arm_release \
-  build_aarch64_dev \
+  build_aarch64_release \
-  build_x86_64_dev \
+  build_x86_64_release \
-  build_i386_dev \
+  build_i386_release \
-  build_ppc_dev \
+  build_ppc_release \
 
 build_everything: build_everything_dev build_everything_release
 

libafl_qemu/librasan/asan/Cargo.toml

@@ -59,6 +59,11 @@ log = { version = "0.4.22", default-features = false, features = [
   "release_max_level_info",
 ] }
 libc = { version = "0.2.169", default-features = false, optional = true }
+nostd-musl = { version = "0.1.5", default-features = false, features = [
+  "optimized-assembly",
+] }
+nostd-printf = { version = "0.1.4", default-features = false }
+
 readonly = { version = "0.2.12", default-features = false }
 rustix = { version = "1.0.0", default-features = false, features = [
   "fs",

libafl_qemu/librasan/asan/build.rs

@@ -1,10 +1,8 @@
 fn main() {
     println!("cargo:rerun-if-changed=cc/include/hooks.h");
     println!("cargo:rerun-if-changed=cc/include/trace.h");
-    println!("cargo:rerun-if-changed=cc/include/printf.h");
     println!("cargo:rerun-if-changed=cc/src/asprintf.c");
     println!("cargo:rerun-if-changed=cc/src/log.c");
-    println!("cargo:rerun-if-changed=cc/src/printf.c");
     println!("cargo:rerun-if-changed=cc/src/vasprintf.c");
 
     cc::Build::new()
@@ -12,6 +10,8 @@ fn main() {
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
+        .flag("-U_FORTIFY_SOURCE")
+        .flag("-D_FORTIFY_SOURCE=0")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/asprintf.c")
@@ -22,6 +22,8 @@ fn main() {
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
+        .flag("-U_FORTIFY_SOURCE")
+        .flag("-D_FORTIFY_SOURCE=0")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/log.c")
@@ -32,16 +34,8 @@ fn main() {
         .opt_level(3)
         .flag("-Werror")
         .flag("-fno-stack-protector")
-        .flag("-ffunction-sections")
+        .flag("-U_FORTIFY_SOURCE")
-        .include("cc/include/")
+        .flag("-D_FORTIFY_SOURCE=0")
-        .file("cc/src/printf.c")
-        .compile("printf");
-
-    cc::Build::new()
-        .define("_GNU_SOURCE", None)
-        .opt_level(3)
-        .flag("-Werror")
-        .flag("-fno-stack-protector")
         .flag("-ffunction-sections")
         .include("cc/include/")
         .file("cc/src/vasprintf.c")

libafl_qemu/librasan/asan/cc/include/printf.h

@@ -1,116 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-// \author (c) Marco Paland (info@paland.com)
-//             2014-2019, PALANDesign Hannover, Germany
-//
-// \license The MIT License (MIT)
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-// \brief Tiny printf, sprintf and snprintf implementation, optimized for speed
-// on
-//        embedded systems with a very limited resources.
-//        Use this instead of bloated standard/newlib printf.
-//        These routines are thread safe and reentrant.
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#ifndef _PRINTF_H_
-#define _PRINTF_H_
-
-#include <stdarg.h>
-#include <stddef.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * Output a character to a custom device like UART, used by the printf()
- * function This function is declared here only. You have to write your custom
- * implementation somewhere \param character Character to output
- */
-void _putchar(char character);
-
-/**
- * Tiny printf implementation
- * You have to implement _putchar if you use printf()
- * To avoid conflicts with the regular printf() API it is overridden by macro
- * defines and internal underscore-appended functions like printf_() are used
- * \param format A string that specifies the format of the output
- * \return The number of characters that are written into the array, not
- * counting the terminating null character
- */
-#define printf printf_
-int printf_(const char *format, ...);
-
-/**
- * Tiny sprintf implementation
- * Due to security reasons (buffer overflow) YOU SHOULD CONSIDER USING
- * (V)SNPRINTF INSTEAD! \param buffer A pointer to the buffer where to store the
- * formatted string. MUST be big enough to store the output! \param format A
- * string that specifies the format of the output \return The number of
- * characters that are WRITTEN into the buffer, not counting the terminating
- * null character
- */
-#define sprintf sprintf_
-int sprintf_(char *buffer, const char *format, ...);
-
-/**
- * Tiny snprintf/vsnprintf implementation
- * \param buffer A pointer to the buffer where to store the formatted string
- * \param count The maximum number of characters to store in the buffer,
- * including a terminating null character \param format A string that specifies
- * the format of the output \param va A value identifying a variable arguments
- * list \return The number of characters that COULD have been written into the
- * buffer, not counting the terminating null character. A value equal or larger
- * than count indicates truncation. Only when the returned value is non-negative
- * and less than count, the string has been completely written.
- */
-#define snprintf snprintf_
-#define vsnprintf vsnprintf_
-int snprintf_(char *buffer, size_t count, const char *format, ...);
-int vsnprintf_(char *buffer, size_t count, const char *format, va_list va);
-
-/**
- * Tiny vprintf implementation
- * \param format A string that specifies the format of the output
- * \param va A value identifying a variable arguments list
- * \return The number of characters that are WRITTEN into the buffer, not
- * counting the terminating null character
- */
-#define vprintf vprintf_
-int vprintf_(const char *format, va_list va);
-
-/**
- * printf with output function
- * You may use this as dynamic alternative to printf() with its fixed _putchar()
- * output \param out An output function which takes one character and an
- * argument pointer \param arg An argument pointer for user data passed to
- * output function \param format A string that specifies the format of the
- * output \return The number of characters that are sent to the output function,
- * not counting the terminating null character
- */
-int fctprintf(void (*out)(char character, void *arg), void *arg,
-              const char *format, ...);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // _PRINTF_H_

libafl_qemu/librasan/asan/cc/src/asprintf.c

@@ -1,8 +1,8 @@
 #include <limits.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdio.h>
 #include "hooks.h"
-#include "printf.h"
 #include "trace.h"
 
 int asprintf(char **restrict strp, const char *restrict fmt, ...) {
@@ -13,7 +13,7 @@ int asprintf(char **restrict strp, const char *restrict fmt, ...) {
 
   va_list va;
   va_start(va, fmt);
-  int len = vsnprintf_(NULL, 0, fmt, va);
+  int len = vsnprintf(NULL, 0, fmt, va);
   va_end(va);
 
   if (len < 0) { return -1; }
@@ -22,5 +22,5 @@ int asprintf(char **restrict strp, const char *restrict fmt, ...) {
   if (buffer == NULL) { return -1; }
 
   *strp = buffer;
-  return vsnprintf_(buffer, len, fmt, va);
+  return vsnprintf(buffer, len, fmt, va);
 }

libafl_qemu/librasan/asan/cc/src/log.c

@@ -1,6 +1,6 @@
 #include <limits.h>
 #include <stdarg.h>
-#include "printf.h"
+#include <stdio.h>
 
 static char log_buffer[PATH_MAX] = {0};
 
@@ -9,13 +9,7 @@ extern void log_trace(char *msg);
 void trace(const char *fmt, ...) {
   va_list va;
   va_start(va, fmt);
-  int len = vsnprintf_(log_buffer, sizeof(log_buffer), fmt, va);
+  int len = vsnprintf(log_buffer, sizeof(log_buffer), fmt, va);
   if (len > 0) { log_trace(log_buffer); }
   va_end(va);
 }
-
-#ifdef __powerpc__
-void _putchar(char c) {
-  (void)c;
-}
-#endif

libafl_qemu/librasan/asan/cc/src/printf.c

@@ -1,924 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-// \author (c) Marco Paland (info@paland.com)
-//             2014-2019, PALANDesign Hannover, Germany
-//
-// \license The MIT License (MIT)
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-// THE SOFTWARE.
-//
-// \brief Tiny printf, sprintf and (v)snprintf implementation, optimized for
-// speed on
-//        embedded systems with a very limited resources. These routines are
-//        thread safe and reentrant! Use this instead of the bloated
-//        standard/newlib printf cause these use malloc for printf (and may not
-//        be thread safe).
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "printf.h"
-
-// define this globally (e.g. gcc -DPRINTF_INCLUDE_CONFIG_H ...) to include the
-// printf_config.h header file
-// default: undefined
-#ifdef PRINTF_INCLUDE_CONFIG_H
-  #include "printf_config.h"
-#endif
-
-// 'ntoa' conversion buffer size, this must be big enough to hold one converted
-// numeric number including padded zeros (dynamically created on stack)
-// default: 32 byte
-#ifndef PRINTF_NTOA_BUFFER_SIZE
-  #define PRINTF_NTOA_BUFFER_SIZE 32U
-#endif
-
-// 'ftoa' conversion buffer size, this must be big enough to hold one converted
-// float number including padded zeros (dynamically created on stack)
-// default: 32 byte
-#ifndef PRINTF_FTOA_BUFFER_SIZE
-  #define PRINTF_FTOA_BUFFER_SIZE 32U
-#endif
-
-// support for the floating point type (%f)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_FLOAT
-  #define PRINTF_SUPPORT_FLOAT
-#endif
-
-// support for exponential floating point notation (%e/%g)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_EXPONENTIAL
-  #define PRINTF_SUPPORT_EXPONENTIAL
-#endif
-
-// define the default floating point precision
-// default: 6 digits
-#ifndef PRINTF_DEFAULT_FLOAT_PRECISION
-  #define PRINTF_DEFAULT_FLOAT_PRECISION 6U
-#endif
-
-// define the largest float suitable to print with %f
-// default: 1e9
-#ifndef PRINTF_MAX_FLOAT
-  #define PRINTF_MAX_FLOAT 1e9
-#endif
-
-// support for the long long types (%llu or %p)
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_LONG_LONG
-  #define PRINTF_SUPPORT_LONG_LONG
-#endif
-
-// support for the ptrdiff_t type (%t)
-// ptrdiff_t is normally defined in <stddef.h> as long or long long type
-// default: activated
-#ifndef PRINTF_DISABLE_SUPPORT_PTRDIFF_T
-  #define PRINTF_SUPPORT_PTRDIFF_T
-#endif
-
-///////////////////////////////////////////////////////////////////////////////
-
-// internal flag definitions
-#define FLAGS_ZEROPAD (1U << 0U)
-#define FLAGS_LEFT (1U << 1U)
-#define FLAGS_PLUS (1U << 2U)
-#define FLAGS_SPACE (1U << 3U)
-#define FLAGS_HASH (1U << 4U)
-#define FLAGS_UPPERCASE (1U << 5U)
-#define FLAGS_CHAR (1U << 6U)
-#define FLAGS_SHORT (1U << 7U)
-#define FLAGS_LONG (1U << 8U)
-#define FLAGS_LONG_LONG (1U << 9U)
-#define FLAGS_PRECISION (1U << 10U)
-#define FLAGS_ADAPT_EXP (1U << 11U)
-
-// import float.h for DBL_MAX
-#if defined(PRINTF_SUPPORT_FLOAT)
-  #include <float.h>
-#endif
-
-// output function type
-typedef void (*out_fct_type)(char character, void *buffer, size_t idx,
-                             size_t maxlen);
-
-// wrapper (used as buffer) for output function type
-typedef struct {
-  void (*fct)(char character, void *arg);
-  void *arg;
-} out_fct_wrap_type;
-
-// internal buffer output
-static inline void _out_buffer(char character, void *buffer, size_t idx,
-                               size_t maxlen) {
-  if (idx < maxlen) { ((char *)buffer)[idx] = character; }
-}
-
-// internal null output
-static inline void _out_null(char character, void *buffer, size_t idx,
-                             size_t maxlen) {
-  (void)character;
-  (void)buffer;
-  (void)idx;
-  (void)maxlen;
-}
-
-// internal _putchar wrapper
-static inline void _out_char(char character, void *buffer, size_t idx,
-                             size_t maxlen) {
-  (void)buffer;
-  (void)idx;
-  (void)maxlen;
-  if (character) { _putchar(character); }
-}
-
-// internal output function wrapper
-static inline void _out_fct(char character, void *buffer, size_t idx,
-                            size_t maxlen) {
-  (void)idx;
-  (void)maxlen;
-  if (character) {
-    // buffer is the output fct pointer
-    ((out_fct_wrap_type *)buffer)
-        ->fct(character, ((out_fct_wrap_type *)buffer)->arg);
-  }
-}
-
-// internal secure strlen
-// \return The length of the string (excluding the terminating 0) limited by
-// 'maxsize'
-static inline unsigned int _strnlen_s(const char *str, size_t maxsize) {
-  const char *s;
-  for (s = str; *s && maxsize--; ++s)
-    ;
-  return (unsigned int)(s - str);
-}
-
-// internal test if char is a digit (0-9)
-// \return true if char is a digit
-static inline bool _is_digit(char ch) {
-  return (ch >= '0') && (ch <= '9');
-}
-
-// internal ASCII string to unsigned int conversion
-static unsigned int _atoi(const char **str) {
-  unsigned int i = 0U;
-  while (_is_digit(**str)) {
-    i = i * 10U + (unsigned int)(*((*str)++) - '0');
-  }
-  return i;
-}
-
-// output the specified string in reverse, taking care of any zero-padding
-static size_t _out_rev(out_fct_type out, char *buffer, size_t idx,
-                       size_t maxlen, const char *buf, size_t len,
-                       unsigned int width, unsigned int flags) {
-  const size_t start_idx = idx;
-
-  // pad spaces up to given width
-  if (!(flags & FLAGS_LEFT) && !(flags & FLAGS_ZEROPAD)) {
-    for (size_t i = len; i < width; i++) {
-      out(' ', buffer, idx++, maxlen);
-    }
-  }
-
-  // reverse string
-  while (len) {
-    out(buf[--len], buffer, idx++, maxlen);
-  }
-
-  // append pad spaces up to given width
-  if (flags & FLAGS_LEFT) {
-    while (idx - start_idx < width) {
-      out(' ', buffer, idx++, maxlen);
-    }
-  }
-
-  return idx;
-}
-
-// internal itoa format
-static size_t _ntoa_format(out_fct_type out, char *buffer, size_t idx,
-                           size_t maxlen, char *buf, size_t len, bool negative,
-                           unsigned int base, unsigned int prec,
-                           unsigned int width, unsigned int flags) {
-  // pad leading zeros
-  if (!(flags & FLAGS_LEFT)) {
-    if (width && (flags & FLAGS_ZEROPAD) &&
-        (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
-      width--;
-    }
-    while ((len < prec) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-    while ((flags & FLAGS_ZEROPAD) && (len < width) &&
-           (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-  }
-
-  // handle hash
-  if (flags & FLAGS_HASH) {
-    if (!(flags & FLAGS_PRECISION) && len &&
-        ((len == prec) || (len == width))) {
-      len--;
-      if (len && (base == 16U)) { len--; }
-    }
-    if ((base == 16U) && !(flags & FLAGS_UPPERCASE) &&
-        (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'x';
-    } else if ((base == 16U) && (flags & FLAGS_UPPERCASE) &&
-               (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'X';
-    } else if ((base == 2U) && (len < PRINTF_NTOA_BUFFER_SIZE)) {
-      buf[len++] = 'b';
-    }
-    if (len < PRINTF_NTOA_BUFFER_SIZE) { buf[len++] = '0'; }
-  }
-
-  if (len < PRINTF_NTOA_BUFFER_SIZE) {
-    if (negative) {
-      buf[len++] = '-';
-    } else if (flags & FLAGS_PLUS) {
-      buf[len++] = '+';  // ignore the space if the '+' exists
-    } else if (flags & FLAGS_SPACE) {
-      buf[len++] = ' ';
-    }
-  }
-
-  return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
-}
-
-// internal itoa for 'long' type
-static size_t _ntoa_long(out_fct_type out, char *buffer, size_t idx,
-                         size_t maxlen, unsigned long value, bool negative,
-                         unsigned long base, unsigned int prec,
-                         unsigned int width, unsigned int flags) {
-  char   buf[PRINTF_NTOA_BUFFER_SIZE];
-  size_t len = 0U;
-
-  // no hash for 0 values
-  if (!value) { flags &= ~FLAGS_HASH; }
-
-  // write if precision != 0 and value is != 0
-  if (!(flags & FLAGS_PRECISION) || value) {
-    do {
-      const char digit = (char)(value % base);
-      buf[len++] = digit < 10
-                       ? '0' + digit
-                       : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
-      value /= base;
-    } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
-  }
-
-  return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative,
-                      (unsigned int)base, prec, width, flags);
-}
-
-// internal itoa for 'long long' type
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-static size_t _ntoa_long_long(out_fct_type out, char *buffer, size_t idx,
-                              size_t maxlen, unsigned long long value,
-                              bool negative, unsigned long long base,
-                              unsigned int prec, unsigned int width,
-                              unsigned int flags) {
-  char   buf[PRINTF_NTOA_BUFFER_SIZE];
-  size_t len = 0U;
-
-  // no hash for 0 values
-  if (!value) { flags &= ~FLAGS_HASH; }
-
-  // write if precision != 0 and value is != 0
-  if (!(flags & FLAGS_PRECISION) || value) {
-    do {
-      const char digit = (char)(value % base);
-      buf[len++] = digit < 10
-                       ? '0' + digit
-                       : (flags & FLAGS_UPPERCASE ? 'A' : 'a') + digit - 10;
-      value /= base;
-    } while (value && (len < PRINTF_NTOA_BUFFER_SIZE));
-  }
-
-  return _ntoa_format(out, buffer, idx, maxlen, buf, len, negative,
-                      (unsigned int)base, prec, width, flags);
-}
-#endif  // PRINTF_SUPPORT_LONG_LONG
-
-#if defined(PRINTF_SUPPORT_FLOAT)
-
-  #if defined(PRINTF_SUPPORT_EXPONENTIAL)
-// forward declaration so that _ftoa can switch to exp notation for values >
-// PRINTF_MAX_FLOAT
-static size_t _etoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen,
-                    double value, unsigned int prec, unsigned int width,
-                    unsigned int flags);
-  #endif
-
-// internal ftoa for fixed decimal floating point
-static size_t _ftoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen,
-                    double value, unsigned int prec, unsigned int width,
-                    unsigned int flags) {
-  char   buf[PRINTF_FTOA_BUFFER_SIZE];
-  size_t len = 0U;
-  double diff = 0.0;
-
-  // powers of 10
-  static const double pow10[] = {1,         10,        100,     1000,
-                                 10000,     100000,    1000000, 10000000,
-                                 100000000, 1000000000};
-
-  // test for special values
-  if (value != value)
-    return _out_rev(out, buffer, idx, maxlen, "nan", 3, width, flags);
-  if (value < -DBL_MAX)
-    return _out_rev(out, buffer, idx, maxlen, "fni-", 4, width, flags);
-  if (value > DBL_MAX)
-    return _out_rev(out, buffer, idx, maxlen,
-                    (flags & FLAGS_PLUS) ? "fni+" : "fni",
-                    (flags & FLAGS_PLUS) ? 4U : 3U, width, flags);
-
-  // test for very large values
-  // standard printf behavior is to print EVERY whole number digit -- which
-  // could be 100s of characters overflowing your buffers == bad
-  if ((value > PRINTF_MAX_FLOAT) || (value < -PRINTF_MAX_FLOAT)) {
-  #if defined(PRINTF_SUPPORT_EXPONENTIAL)
-    return _etoa(out, buffer, idx, maxlen, value, prec, width, flags);
-  #else
-    return 0U;
-  #endif
-  }
-
-  // test for negative
-  bool negative = false;
-  if (value < 0) {
-    negative = true;
-    value = 0 - value;
-  }
-
-  // set default precision, if not set explicitly
-  if (!(flags & FLAGS_PRECISION)) { prec = PRINTF_DEFAULT_FLOAT_PRECISION; }
-  // limit precision to 9, cause a prec >= 10 can lead to overflow errors
-  while ((len < PRINTF_FTOA_BUFFER_SIZE) && (prec > 9U)) {
-    buf[len++] = '0';
-    prec--;
-  }
-
-  int           whole = (int)value;
-  double        tmp = (value - whole) * pow10[prec];
-  unsigned long frac = (unsigned long)tmp;
-  diff = tmp - frac;
-
-  if (diff > 0.5) {
-    ++frac;
-    // handle rollover, e.g. case 0.99 with prec 1 is 1.0
-    if (frac >= pow10[prec]) {
-      frac = 0;
-      ++whole;
-    }
-  } else if (diff < 0.5) {
-  } else if ((frac == 0U) || (frac & 1U)) {
-    // if halfway, round up if odd OR if last digit is 0
-    ++frac;
-  }
-
-  if (prec == 0U) {
-    diff = value - (double)whole;
-    if ((!(diff < 0.5) || (diff > 0.5)) && (whole & 1)) {
-      // exactly 0.5 and ODD, then round up
-      // 1.5 -> 2, but 2.5 -> 2
-      ++whole;
-    }
-  } else {
-    unsigned int count = prec;
-    // now do fractional part, as an unsigned number
-    while (len < PRINTF_FTOA_BUFFER_SIZE) {
-      --count;
-      buf[len++] = (char)(48U + (frac % 10U));
-      if (!(frac /= 10U)) { break; }
-    }
-    // add extra 0s
-    while ((len < PRINTF_FTOA_BUFFER_SIZE) && (count-- > 0U)) {
-      buf[len++] = '0';
-    }
-    if (len < PRINTF_FTOA_BUFFER_SIZE) {
-      // add decimal
-      buf[len++] = '.';
-    }
-  }
-
-  // do whole part, number is reversed
-  while (len < PRINTF_FTOA_BUFFER_SIZE) {
-    buf[len++] = (char)(48 + (whole % 10));
-    if (!(whole /= 10)) { break; }
-  }
-
-  // pad leading zeros
-  if (!(flags & FLAGS_LEFT) && (flags & FLAGS_ZEROPAD)) {
-    if (width && (negative || (flags & (FLAGS_PLUS | FLAGS_SPACE)))) {
-      width--;
-    }
-    while ((len < width) && (len < PRINTF_FTOA_BUFFER_SIZE)) {
-      buf[len++] = '0';
-    }
-  }
-
-  if (len < PRINTF_FTOA_BUFFER_SIZE) {
-    if (negative) {
-      buf[len++] = '-';
-    } else if (flags & FLAGS_PLUS) {
-      buf[len++] = '+';  // ignore the space if the '+' exists
-    } else if (flags & FLAGS_SPACE) {
-      buf[len++] = ' ';
-    }
-  }
-
-  return _out_rev(out, buffer, idx, maxlen, buf, len, width, flags);
-}
-
-  #if defined(PRINTF_SUPPORT_EXPONENTIAL)
-// internal ftoa variant for exponential floating-point type, contributed by
-// Martijn Jasperse <m.jasperse@gmail.com>
-static size_t _etoa(out_fct_type out, char *buffer, size_t idx, size_t maxlen,
-                    double value, unsigned int prec, unsigned int width,
-                    unsigned int flags) {
-  // check for NaN and special values
-  if ((value != value) || (value > DBL_MAX) || (value < -DBL_MAX)) {
-    return _ftoa(out, buffer, idx, maxlen, value, prec, width, flags);
-  }
-
-  // determine the sign
-  const bool negative = value < 0;
-  if (negative) { value = -value; }
-
-  // default precision
-  if (!(flags & FLAGS_PRECISION)) { prec = PRINTF_DEFAULT_FLOAT_PRECISION; }
-
-  // determine the decimal exponent
-  // based on the algorithm by David Gay (https://www.ampl.com/netlib/fp/dtoa.c)
-  union {
-    uint64_t U;
-    double   F;
-  } conv;
-
-  conv.F = value;
-  int exp2 = (int)((conv.U >> 52U) & 0x07FFU) - 1023;  // effectively log2
-  conv.U = (conv.U & ((1ULL << 52U) - 1U)) |
-           (1023ULL << 52U);  // drop the exponent so conv.F is now in [1,2)
-  // now approximate log10 from the log2 integer part and an expansion of ln
-  // around 1.5
-  int expval = (int)(0.1760912590558 + exp2 * 0.301029995663981 +
-                     (conv.F - 1.5) * 0.289529654602168);
-  // now we want to compute 10^expval but we want to be sure it won't overflow
-  exp2 = (int)(expval * 3.321928094887362 + 0.5);
-  const double z = expval * 2.302585092994046 - exp2 * 0.6931471805599453;
-  const double z2 = z * z;
-  conv.U = (uint64_t)(exp2 + 1023) << 52U;
-  // compute exp(z) using continued fractions, see
-  // https://en.wikipedia.org/wiki/Exponential_function#Continued_fractions_for_ex
-  conv.F *= 1 + 2 * z / (2 - z + (z2 / (6 + (z2 / (10 + z2 / 14)))));
-  // correct for rounding errors
-  if (value < conv.F) {
-    expval--;
-    conv.F /= 10;
-  }
-
-  // the exponent format is "%+03d" and largest value is "307", so set aside 4-5
-  // characters
-  unsigned int minwidth = ((expval < 100) && (expval > -100)) ? 4U : 5U;
-
-  // in "%g" mode, "prec" is the number of *significant figures* not decimals
-  if (flags & FLAGS_ADAPT_EXP) {
-    // do we want to fall-back to "%f" mode?
-    if ((value >= 1e-4) && (value < 1e6)) {
-      if ((int)prec > expval) {
-        prec = (unsigned)((int)prec - expval - 1);
-      } else {
-        prec = 0;
-      }
-      flags |= FLAGS_PRECISION;  // make sure _ftoa respects precision
-      // no characters in exponent
-      minwidth = 0U;
-      expval = 0;
-    } else {
-      // we use one sigfig for the whole part
-      if ((prec > 0) && (flags & FLAGS_PRECISION)) { --prec; }
-    }
-  }
-
-  // will everything fit?
-  unsigned int fwidth = width;
-  if (width > minwidth) {
-    // we didn't fall-back so subtract the characters required for the exponent
-    fwidth -= minwidth;
-  } else {
-    // not enough characters, so go back to default sizing
-    fwidth = 0U;
-  }
-  if ((flags & FLAGS_LEFT) && minwidth) {
-    // if we're padding on the right, DON'T pad the floating part
-    fwidth = 0U;
-  }
-
-  // rescale the float value
-  if (expval) { value /= conv.F; }
-
-  // output the floating part
-  const size_t start_idx = idx;
-  idx = _ftoa(out, buffer, idx, maxlen, negative ? -value : value, prec, fwidth,
-              flags & ~FLAGS_ADAPT_EXP);
-
-  // output the exponent part
-  if (minwidth) {
-    // output the exponential symbol
-    out((flags & FLAGS_UPPERCASE) ? 'E' : 'e', buffer, idx++, maxlen);
-    // output the exponent value
-    idx =
-        _ntoa_long(out, buffer, idx, maxlen, (expval < 0) ? -expval : expval,
-                   expval < 0, 10, 0, minwidth - 1, FLAGS_ZEROPAD | FLAGS_PLUS);
-    // might need to right-pad spaces
-    if (flags & FLAGS_LEFT) {
-      while (idx - start_idx < width)
-        out(' ', buffer, idx++, maxlen);
-    }
-  }
-  return idx;
-}
-  #endif  // PRINTF_SUPPORT_EXPONENTIAL
-#endif    // PRINTF_SUPPORT_FLOAT
-
-// internal vsnprintf
-static int _vsnprintf(out_fct_type out, char *buffer, const size_t maxlen,
-                      const char *format, va_list va) {
-  unsigned int flags, width, precision, n;
-  size_t       idx = 0U;
-
-  if (!buffer) {
-    // use null output function
-    out = _out_null;
-  }
-
-  while (*format) {
-    // format specifier?  %[flags][width][.precision][length]
-    if (*format != '%') {
-      // no
-      out(*format, buffer, idx++, maxlen);
-      format++;
-      continue;
-    } else {
-      // yes, evaluate it
-      format++;
-    }
-
-    // evaluate flags
-    flags = 0U;
-    do {
-      switch (*format) {
-        case '0':
-          flags |= FLAGS_ZEROPAD;
-          format++;
-          n = 1U;
-          break;
-        case '-':
-          flags |= FLAGS_LEFT;
-          format++;
-          n = 1U;
-          break;
-        case '+':
-          flags |= FLAGS_PLUS;
-          format++;
-          n = 1U;
-          break;
-        case ' ':
-          flags |= FLAGS_SPACE;
-          format++;
-          n = 1U;
-          break;
-        case '#':
-          flags |= FLAGS_HASH;
-          format++;
-          n = 1U;
-          break;
-        default:
-          n = 0U;
-          break;
-      }
-    } while (n);
-
-    // evaluate width field
-    width = 0U;
-    if (_is_digit(*format)) {
-      width = _atoi(&format);
-    } else if (*format == '*') {
-      const int w = va_arg(va, int);
-      if (w < 0) {
-        flags |= FLAGS_LEFT;  // reverse padding
-        width = (unsigned int)-w;
-      } else {
-        width = (unsigned int)w;
-      }
-      format++;
-    }
-
-    // evaluate precision field
-    precision = 0U;
-    if (*format == '.') {
-      flags |= FLAGS_PRECISION;
-      format++;
-      if (_is_digit(*format)) {
-        precision = _atoi(&format);
-      } else if (*format == '*') {
-        const int prec = (int)va_arg(va, int);
-        precision = prec > 0 ? (unsigned int)prec : 0U;
-        format++;
-      }
-    }
-
-    // evaluate length field
-    switch (*format) {
-      case 'l':
-        flags |= FLAGS_LONG;
-        format++;
-        if (*format == 'l') {
-          flags |= FLAGS_LONG_LONG;
-          format++;
-        }
-        break;
-      case 'h':
-        flags |= FLAGS_SHORT;
-        format++;
-        if (*format == 'h') {
-          flags |= FLAGS_CHAR;
-          format++;
-        }
-        break;
-#if defined(PRINTF_SUPPORT_PTRDIFF_T)
-      case 't':
-        flags |=
-            (sizeof(ptrdiff_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-#endif
-      case 'j':
-        flags |=
-            (sizeof(intmax_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-      case 'z':
-        flags |=
-            (sizeof(size_t) == sizeof(long) ? FLAGS_LONG : FLAGS_LONG_LONG);
-        format++;
-        break;
-      default:
-        break;
-    }
-
-    // evaluate specifier
-    switch (*format) {
-      case 'd':
-      case 'i':
-      case 'u':
-      case 'x':
-      case 'X':
-      case 'o':
-      case 'b': {
-        // set the base
-        unsigned int base;
-        if (*format == 'x' || *format == 'X') {
-          base = 16U;
-        } else if (*format == 'o') {
-          base = 8U;
-        } else if (*format == 'b') {
-          base = 2U;
-        } else {
-          base = 10U;
-          flags &= ~FLAGS_HASH;  // no hash for dec format
-        }
-        // uppercase
-        if (*format == 'X') { flags |= FLAGS_UPPERCASE; }
-
-        // no plus or space flag for u, x, X, o, b
-        if ((*format != 'i') && (*format != 'd')) {
-          flags &= ~(FLAGS_PLUS | FLAGS_SPACE);
-        }
-
-        // ignore '0' flag when precision is given
-        if (flags & FLAGS_PRECISION) { flags &= ~FLAGS_ZEROPAD; }
-
-        // convert the integer
-        if ((*format == 'i') || (*format == 'd')) {
-          // signed
-          if (flags & FLAGS_LONG_LONG) {
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-            const long long value = va_arg(va, long long);
-            idx = _ntoa_long_long(
-                out, buffer, idx, maxlen,
-                (unsigned long long)(value > 0 ? value : 0 - value), value < 0,
-                base, precision, width, flags);
-#endif
-          } else if (flags & FLAGS_LONG) {
-            const long value = va_arg(va, long);
-            idx = _ntoa_long(out, buffer, idx, maxlen,
-                             (unsigned long)(value > 0 ? value : 0 - value),
-                             value < 0, base, precision, width, flags);
-          } else {
-            const int value = (flags & FLAGS_CHAR) ? (char)va_arg(va, int)
-                              : (flags & FLAGS_SHORT)
-                                  ? (short int)va_arg(va, int)
-                                  : va_arg(va, int);
-            idx = _ntoa_long(out, buffer, idx, maxlen,
-                             (unsigned int)(value > 0 ? value : 0 - value),
-                             value < 0, base, precision, width, flags);
-          }
-        } else {
-          // unsigned
-          if (flags & FLAGS_LONG_LONG) {
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-            idx = _ntoa_long_long(out, buffer, idx, maxlen,
-                                  va_arg(va, unsigned long long), false, base,
-                                  precision, width, flags);
-#endif
-          } else if (flags & FLAGS_LONG) {
-            idx =
-                _ntoa_long(out, buffer, idx, maxlen, va_arg(va, unsigned long),
-                           false, base, precision, width, flags);
-          } else {
-            const unsigned int value =
-                (flags & FLAGS_CHAR) ? (unsigned char)va_arg(va, unsigned int)
-                : (flags & FLAGS_SHORT)
-                    ? (unsigned short int)va_arg(va, unsigned int)
-                    : va_arg(va, unsigned int);
-            idx = _ntoa_long(out, buffer, idx, maxlen, value, false, base,
-                             precision, width, flags);
-          }
-        }
-        format++;
-        break;
-      }
-#if defined(PRINTF_SUPPORT_FLOAT)
-      case 'f':
-      case 'F':
-        if (*format == 'F') flags |= FLAGS_UPPERCASE;
-        idx = _ftoa(out, buffer, idx, maxlen, va_arg(va, double), precision,
-                    width, flags);
-        format++;
-        break;
-  #if defined(PRINTF_SUPPORT_EXPONENTIAL)
-      case 'e':
-      case 'E':
-      case 'g':
-      case 'G':
-        if ((*format == 'g') || (*format == 'G')) flags |= FLAGS_ADAPT_EXP;
-        if ((*format == 'E') || (*format == 'G')) flags |= FLAGS_UPPERCASE;
-        idx = _etoa(out, buffer, idx, maxlen, va_arg(va, double), precision,
-                    width, flags);
-        format++;
-        break;
-  #endif  // PRINTF_SUPPORT_EXPONENTIAL
-#endif    // PRINTF_SUPPORT_FLOAT
-      case 'c': {
-        unsigned int l = 1U;
-        // pre padding
-        if (!(flags & FLAGS_LEFT)) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        // char output
-        out((char)va_arg(va, int), buffer, idx++, maxlen);
-        // post padding
-        if (flags & FLAGS_LEFT) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        format++;
-        break;
-      }
-
-      case 's': {
-        const char  *p = va_arg(va, char *);
-        unsigned int l = _strnlen_s(p, precision ? precision : (size_t)-1);
-        // pre padding
-        if (flags & FLAGS_PRECISION) { l = (l < precision ? l : precision); }
-        if (!(flags & FLAGS_LEFT)) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        // string output
-        while ((*p != 0) && (!(flags & FLAGS_PRECISION) || precision--)) {
-          out(*(p++), buffer, idx++, maxlen);
-        }
-        // post padding
-        if (flags & FLAGS_LEFT) {
-          while (l++ < width) {
-            out(' ', buffer, idx++, maxlen);
-          }
-        }
-        format++;
-        break;
-      }
-
-      case 'p': {
-        width = sizeof(void *) * 2U;
-        flags |= FLAGS_ZEROPAD | FLAGS_UPPERCASE;
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-        const bool is_ll = sizeof(uintptr_t) == sizeof(long long);
-        if (is_ll) {
-          idx = _ntoa_long_long(out, buffer, idx, maxlen,
-                                (uintptr_t)va_arg(va, void *), false, 16U,
-                                precision, width, flags);
-        } else {
-#endif
-          idx = _ntoa_long(out, buffer, idx, maxlen,
-                           (unsigned long)((uintptr_t)va_arg(va, void *)),
-                           false, 16U, precision, width, flags);
-#if defined(PRINTF_SUPPORT_LONG_LONG)
-        }
-#endif
-        format++;
-        break;
-      }
-
-      case '%':
-        out('%', buffer, idx++, maxlen);
-        format++;
-        break;
-
-      default:
-        out(*format, buffer, idx++, maxlen);
-        format++;
-        break;
-    }
-  }
-
-  // termination
-  out((char)0, buffer, idx < maxlen ? idx : maxlen - 1U, maxlen);
-
-  // return written chars without terminating \0
-  return (int)idx;
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-int printf_(const char *format, ...) {
-  va_list va;
-  va_start(va, format);
-  char      buffer[1];
-  const int ret = _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}
-
-int sprintf_(char *buffer, const char *format, ...) {
-  va_list va;
-  va_start(va, format);
-  const int ret = _vsnprintf(_out_buffer, buffer, (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}
-
-int snprintf_(char *buffer, size_t count, const char *format, ...) {
-  va_list va;
-  va_start(va, format);
-  const int ret = _vsnprintf(_out_buffer, buffer, count, format, va);
-  va_end(va);
-  return ret;
-}
-
-int vprintf_(const char *format, va_list va) {
-  char buffer[1];
-  return _vsnprintf(_out_char, buffer, (size_t)-1, format, va);
-}
-
-int vsnprintf_(char *buffer, size_t count, const char *format, va_list va) {
-  return _vsnprintf(_out_buffer, buffer, count, format, va);
-}
-
-int fctprintf(void (*out)(char character, void *arg), void *arg,
-              const char *format, ...) {
-  va_list va;
-  va_start(va, format);
-  const out_fct_wrap_type out_fct_wrap = {out, arg};
-  const int ret = _vsnprintf(_out_fct, (char *)(uintptr_t)&out_fct_wrap,
-                             (size_t)-1, format, va);
-  va_end(va);
-  return ret;
-}

libafl_qemu/librasan/asan/cc/src/vasprintf.c

@@ -1,8 +1,8 @@
 #include <limits.h>
 #include <stdarg.h>
 #include <stddef.h>
+#include <stdio.h>
 #include "hooks.h"
-#include "printf.h"
 #include "trace.h"
 
 int vasprintf(char **restrict strp, const char *restrict fmt, va_list va) {
@@ -11,7 +11,7 @@ int vasprintf(char **restrict strp, const char *restrict fmt, va_list va) {
 
   if (fmt == NULL) { return -1; }
 
-  int len = vsnprintf_(NULL, 0, fmt, va);
+  int len = vsnprintf(NULL, 0, fmt, va);
 
   if (len < 0) { return -1; }
 
@@ -19,5 +19,5 @@ int vasprintf(char **restrict strp, const char *restrict fmt, va_list va) {
   if (buffer == NULL) { return -1; }
 
   *strp = buffer;
-  return vsnprintf_(buffer, len, fmt, va);
+  return vsnprintf(buffer, len, fmt, va);
 }

libafl_qemu/librasan/asan/src/lib.rs

@@ -108,8 +108,11 @@ pub type off_t = isize;
 #[allow(non_camel_case_types)]
 pub type off_t = libc::off_t;
 
+use core::mem::transmute;
+
 #[cfg(not(feature = "test"))]
 use ::core::ffi::{c_char, c_void};
+use nostd_printf::vsnprintf;
 
 #[cfg(not(feature = "test"))]
 unsafe extern "C" {
@@ -126,3 +129,10 @@ unsafe extern "C" {
     pub fn asan_panic(msg: *const c_char) -> !;
     pub fn asan_swap(enabled: bool);
 }
+
+/*
+ * vsnprintf is only called from our C code, but we need to tell Rust that we
+ * still need it even though it isn't referenced from rust.
+ */
+#[used]
+static LINK_VSNPRINTF: unsafe extern "C" fn() = unsafe { transmute(vsnprintf as *const ()) };

libafl_qemu/librasan/asan/src/mem.rs

@@ -1,7 +1,6 @@
-use core::{
+use core::mem::transmute;
-    cmp::Ordering,
+
-    slice::{from_raw_parts, from_raw_parts_mut},
+use nostd_musl::{bcmp, memcmp, memcpy, memmove, memset, strlen};
-};
 
 #[cfg(all(feature = "global_allocator", feature = "dlmalloc"))]
 use crate::allocator::backend::dlmalloc::DlmallocBackend;
@@ -34,107 +33,24 @@ static GLOBAL_ALLOCATOR: DlmallocBackend<Mmap> = DlmallocBackend::new(PAGE_SIZE)
 static GLOBAL_ALLOCATOR: baby_mimalloc::MimallocMutexWrapper<DlmallocBackend<Mmap>> =
     baby_mimalloc::MimallocMutexWrapper::with_os_allocator(DlmallocBackend::new(PAGE_SIZE));
 
-#[unsafe(no_mangle)]
+/*
-pub unsafe extern "C" fn memmove(dest: *mut u8, src: *const u8, count: usize) {
+ * The functions are only called from our C code, but we need to tell Rust that
-    let src_slice = unsafe { from_raw_parts(src, count) };
+ * we still need it even though it isn't referenced from rust.
-    let dest_slice = unsafe { from_raw_parts_mut(dest, count) };
+ */
+#[used]
+static LINK_BCMP: unsafe extern "C" fn() = unsafe { transmute(bcmp as *const ()) };
 
-    if src < dest {
+#[used]
-        #[allow(clippy::manual_memcpy)]
+static LINK_MEMCMP: unsafe extern "C" fn() = unsafe { transmute(memcmp as *const ()) };
-        for i in 0..count {
-            let idx = count - 1 - i;
-            dest_slice[idx] = src_slice[idx];
-        }
-    } else {
-        #[allow(clippy::manual_memcpy)]
-        for i in 0..count {
-            dest_slice[i] = src_slice[i];
-        }
-    }
-}
 
-#[unsafe(no_mangle)]
+#[used]
-pub unsafe extern "C" fn memcpy(dest: *mut u8, src: *const u8, count: usize) {
+static LINK_MEMCPY: unsafe extern "C" fn() = unsafe { transmute(memcpy as *const ()) };
-    let src_slice = unsafe { from_raw_parts(src, count) };
-    let dest_slice = unsafe { from_raw_parts_mut(dest, count) };
-    #[allow(clippy::manual_memcpy)]
-    for i in 0..count {
-        dest_slice[i] = src_slice[i];
-    }
-}
 
-#[unsafe(no_mangle)]
+#[used]
-pub unsafe extern "C" fn memset(dest: *mut u8, value: u8, count: usize) {
+static LINK_MEMMOVE: unsafe extern "C" fn() = unsafe { transmute(memmove as *const ()) };
-    unsafe {
-        let mut cursor = dest;
-        let word_value = match value {
-            u8::MIN => Some(usize::MIN),
-            u8::MAX => Some(usize::MAX),
-            _ => None,
-        };
 
-        if let Some(word_value) = word_value {
+#[used]
-            let num_words = count / size_of::<usize>();
+static LINK_MEMSET: unsafe extern "C" fn() = unsafe { transmute(memset as *const ()) };
-            for _ in 0..num_words {
-                *(cursor as *mut usize) = word_value;
-                cursor = cursor.wrapping_add(size_of::<usize>());
-            }
 
-            let num_bytes = count % size_of::<usize>();
+#[used]
-            for _ in 0..num_bytes {
+static LINK_STRLEN: unsafe extern "C" fn() = unsafe { transmute(strlen as *const ()) };
-                *cursor = value;
-                cursor = cursor.wrapping_add(1);
-            }
-        } else {
-            for _ in 0..count {
-                *cursor = value;
-                cursor = cursor.wrapping_add(1);
-            }
-        }
-    }
-}
-
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn memcmp(ptr1: *const u8, ptr2: *const u8, count: usize) -> i32 {
-    let slice1 = unsafe { from_raw_parts(ptr1, count) };
-    let slice2 = unsafe { from_raw_parts(ptr2, count) };
-
-    for i in 0..count {
-        match slice1[i].cmp(&slice2[i]) {
-            Ordering::Equal => (),
-            Ordering::Less => return -1,
-            Ordering::Greater => return 1,
-        }
-    }
-
-    0
-}
-
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn bcmp(ptr1: *const u8, ptr2: *const u8, count: usize) -> i32 {
-    let slice1 = unsafe { from_raw_parts(ptr1, count) };
-    let slice2 = unsafe { from_raw_parts(ptr2, count) };
-
-    for i in 0..count {
-        if slice1[i] != slice2[i] {
-            return 1;
-        }
-    }
-
-    0
-}
-
-#[unsafe(no_mangle)]
-pub unsafe extern "C" fn strlen(s: *const u8) -> usize {
-    let mut i = 0;
-    let mut cursor = s;
-
-    unsafe {
-        while *cursor != 0 {
-            cursor = cursor.offset(1);
-            i += 1;
-        }
-    }
-
-    i
-}