/src/wireshark/wsutil/strtoi.c

Source (jump to first uncovered line)
/* strtoi.c
 * Utilities to convert strings to integers
 *
 * Copyright 2016, Dario Lombardo
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <errno.h>

#include <glib.h>

#include "strtoi.h"
#include <wsutil/ws_assert.h>

bool ws_strtoi64(const char* str, const char** endptr, int64_t* cint)
{
  char* end;
  int64_t val;

  ws_assert(cint);

  if (!str) {
    errno = EINVAL;
    return false;
  }

  errno = 0;
  val = g_ascii_strtoll(str, &end, 10);
  if ((val == 0 && end == str) || (endptr == NULL && *end != '\0')) {
    *cint = 0;
    if (endptr != NULL)
      *endptr = end;
    errno = EINVAL;
    return false;
  }
  if ((val == INT64_MAX || val == INT64_MIN) && errno == ERANGE) {
    /*
     * Return the value, so our caller knows whether to
     * report the value as "too small" or "too large".
     */
    *cint = val;
    if (endptr != NULL)
      *endptr = end;
    /* errno is already set */
    return false;
  }
  if (endptr != NULL)
    *endptr = end;
  *cint = val;
  return true;
}

#define DEFINE_WS_STRTOI_BITS(bits) \
bool ws_strtoi##bits(const char* str, const char** endptr, int##bits##_t* cint) \
{ \
  int64_t val = 0; \
  if (!ws_strtoi64(str, endptr, &val)) { \
    /* \
     * For ERANGE, return either INT##bits##_MIN or \
     * INT##bits##_MAX so our caller knows whether \
     * to report the value as "too small" or "too \
     * large". \
     * \
     * For other errors, return 0, for parallelism \
     * with ws_strtoi64(). \
     */ \
    if (errno == ERANGE) { \
      if (val < 0) \
        *cint = INT##bits##_MIN; \
      else \
        *cint = INT##bits##_MAX; \
    } else \
      *cint = 0; \
    return false; \
  } \
  if (val < INT##bits##_MIN) { \
    /* \
     * Return INT##bits##_MIN so our caller knows whether to \
     * report the value as "too small" or "too large". \
     */ \
    *cint = INT##bits##_MIN; \
    errno = ERANGE; \
    return false; \
  } \
  if (val > INT##bits##_MAX) { \
    /* \
     * Return INT##bits##_MAX so our caller knows whether to \
     * report the value as "too small" or "too large". \
     */ \
    *cint = INT##bits##_MAX; \
    errno = ERANGE; \
    return false; \
  } \
  *cint = (int##bits##_t)val; \
  return true; \
}

DEFINE_WS_STRTOI_BITS(32)
DEFINE_WS_STRTOI_BITS(16)
DEFINE_WS_STRTOI_BITS(8)

bool ws_strtoi(const char* str, const char** endptr, int* cint)
{
  int64_t val = 0;
  if (!ws_strtoi64(str, endptr, &val)) {
    /*
     * For ERANGE, return either INT_MIN or
     * INT_MAX so our caller knows whether
     * to report the value as "too small" or "too
     * large".
     *
     * For other errors, return 0, for parallelism
     * with ws_strtoi64().
     */
    if (errno == ERANGE) {
      if (val < 0)
        *cint = INT_MIN;
      else
        *cint = INT_MAX;
    } else
      *cint = 0;
    return false;
  }
  if (val < INT_MIN) {
    /*
     * Return INT_MIN so our caller knows whether to
     * report the value as "too small" or "too large".
     */
    *cint = INT_MIN;
    errno = ERANGE;
    return false;
  }
  if (val > INT_MAX) {
    /*
     * Return INT_MAX so our caller knows whether to
     * report the value as "too small" or "too large".
     */
    *cint = INT_MAX;
    errno = ERANGE;
    return false;
  }
  *cint = (int)val;
  return true;
}

bool ws_basestrtou64(const char* str, const char** endptr, uint64_t* cint, int base)
{
  char* end;
  uint64_t val;

  ws_assert(cint);

  if (!str) {
    errno = EINVAL;
    return false;
  }

  if (str[0] == '-' || str[0] == '+') {
    /*
     * Unsigned numbers don't have a sign.
     */
    *cint = 0;
    if (endptr != NULL)
      *endptr = str;
    errno = EINVAL;
    return false;
  }
  errno = 0;
  val = g_ascii_strtoull(str, &end, base);
  if ((val == 0 && end == str) || (endptr == NULL && *end != '\0')) {
    *cint = 0;
    if (endptr != NULL)
      *endptr = end;
    errno = EINVAL;
    return false;
  }
  if (val == UINT64_MAX && errno == ERANGE) {
    /*
     * Return the value, because ws_strtoi64() does.
     */
    *cint = val;
    if (endptr != NULL)
      *endptr = end;
    /* errno is already set */
    return false;
  }
  if (endptr != NULL)
    *endptr = end;
  *cint = val;
  return true;
}

bool ws_strtou64(const char* str, const char** endptr, uint64_t* cint)
{
  return ws_basestrtou64(str, endptr, cint, 10);
}

bool ws_hexstrtou64(const char* str, const char** endptr, uint64_t* cint)
{
  return ws_basestrtou64(str, endptr, cint, 16);
}

#define DEFINE_WS_STRTOU_BITS(bits) \
bool ws_basestrtou##bits(const char* str, const char** endptr, uint##bits##_t* cint, int base) \
{ \
  uint64_t val; \
  if (!ws_basestrtou64(str, endptr, &val, base)) { \
    /* \
     * For ERANGE, return UINT##bits##_MAX for parallelism \
     * with ws_strtoi##bits(). \
     * \
     * For other errors, return 0, for parallelism \
     * with ws_basestrtou64(). \
     */ \
    if (errno == ERANGE) \
      *cint = UINT##bits##_MAX; \
    else \
      *cint = 0; \
    return false; \
  } \
  if (val > UINT##bits##_MAX) { \
    /* \
     * Return UINT##bits##_MAX for parallelism with \
     * ws_strtoi##bits(). \
     */ \
    *cint = UINT##bits##_MAX; \
    errno = ERANGE; \
    return false; \
  } \
  *cint = (uint##bits##_t)val; \
  return true; \
} \
\
bool ws_strtou##bits(const char* str, const char** endptr, uint##bits##_t* cint) \
{ \
  return ws_basestrtou##bits(str, endptr, cint, 10); \
} \
\
bool ws_hexstrtou##bits(const char* str, const char** endptr, uint##bits##_t* cint) \
{ \
  return ws_basestrtou##bits(str, endptr, cint, 16); \
}

DEFINE_WS_STRTOU_BITS(32)
DEFINE_WS_STRTOU_BITS(16)
DEFINE_WS_STRTOU_BITS(8)

bool ws_basestrtou(const char* str, const char** endptr, unsigned* cint, int base)
{
  uint64_t val;
  if (!ws_basestrtou64(str, endptr, &val, base)) {
    /*
     * For ERANGE, return UINT_MAX for parallelism
     * with ws_strtoi().
     *
     * For other errors, return 0, for parallelism
     * with ws_basestrtou64().
     */
    if (errno == ERANGE)
      *cint = UINT_MAX;
    else
      *cint = 0;
    return false;
  }
  if (val > UINT_MAX) {
    /*
     * Return UINT_MAX for parallelism with
     * ws_strtoi().
     */
    *cint = UINT_MAX;
    errno = ERANGE;
    return false;
  }
  *cint = (unsigned)val;
  return true;
}

bool ws_strtou(const char* str, const char** endptr, unsigned* cint)
{
  return ws_basestrtou(str, endptr, cint, 10);
}
\
bool ws_hexstrtou(const char* str, const char** endptr, unsigned* cint)
{
  return ws_basestrtou(str, endptr, cint, 16);
}

/*
 * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 *
 * Local variables:
 * c-basic-offset: 4
 * tab-width: 8
 * indent-tabs-mode: t
 * End:
 *
 * vi: set shiftwidth=4 tabstop=8 noexpandtab:
 * :indentSize=4:tabSize=8:noTabs=false:
 */

Coverage Report

Created: 2025-02-15 06:25