1  /*
       2   * Make a hexdump copy of C string
       3   *
       4   * Copyright (c) 2016-2021 Dmitry V. Levin <ldv@strace.io>
       5   * All rights reserved.
       6   *
       7   * SPDX-License-Identifier: GPL-2.0-or-later
       8   */
       9  
      10  #include "tests.h"
      11  
      12  #include <assert.h>
      13  #include <stdlib.h>
      14  #include <string.h>
      15  
      16  const char *
      17  hexdump_memdup(const char *src, size_t len)
      18  {
      19  	size_t dst_size = 3 * len + 2;
      20  	assert(dst_size > len);
      21  
      22  	char *dst = malloc(dst_size);
      23  	if (!dst)
      24  		perror_msg_and_fail("malloc(%zu)", dst_size);
      25  
      26  	char *p = dst;
      27  	const unsigned char *usrc = (const unsigned char *) src;
      28  	for (size_t i = 0; i < len; ++i) {
      29  		unsigned int c = usrc[i];
      30  		*(p++) = ' ';
      31  		if (i == 8)
      32  			*(p++) = ' ';
      33  		*(p++) = "0123456789abcdef"[c >> 4];
      34  		*(p++) = "0123456789abcdef"[c & 0xf];
      35  	}
      36  	*p = '\0';
      37  
      38  	return dst;
      39  }
      40  
      41  const char *
      42  hexdump_strdup(const char *src)
      43  {
      44  	return hexdump_memdup(src, strlen(src));
      45  }