/src/sudo/lib/util/hexchar.c

Source
/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2013-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
 */

#include <config.h>

#include <sudo_compat.h>
#include <sudo_debug.h>
#include <sudo_util.h>

/*
 * Converts a two-byte hex string to decimal.
 * Returns a value 0-255 on success or -1 for invalid input.
 */
int
sudo_hexchar_v1(const char s[restrict static 2])
{
    unsigned char result[2];
    unsigned int i;
    debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL);

    for (i = 0; i < 2; i++) {
  switch (s[i]) {
  case '0':
      result[i] = 0;
      break;
  case '1':
      result[i] = 1;
      break;
  case '2':
      result[i] = 2;
      break;
  case '3':
      result[i] = 3;
      break;
  case '4':
      result[i] = 4;
      break;
  case '5':
      result[i] = 5;
      break;
  case '6':
      result[i] = 6;
      break;
  case '7':
      result[i] = 7;
      break;
  case '8':
      result[i] = 8;
      break;
  case '9':
      result[i] = 9;
      break;
  case 'A':
  case 'a':
      result[i] = 10;
      break;
  case 'B':
  case 'b':
      result[i] = 11;
      break;
  case 'C':
  case 'c':
      result[i] = 12;
      break;
  case 'D':
  case 'd':
      result[i] = 13;
      break;
  case 'E':
  case 'e':
      result[i] = 14;
      break;
  case 'F':
  case 'f':
      result[i] = 15;
      break;
  default:
      /* Invalid input. */
      debug_return_int(-1);
  }
    }
    debug_return_int((result[0] << 4) | result[1]);
}

Coverage Report

Created: 2025-09-17 06:38

Line	Count	Source
1		/*
2		* SPDX-License-Identifier: ISC
3		*
4		* Copyright (c) 2013-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
5		*
6		* Permission to use, copy, modify, and distribute this software for any
7		* purpose with or without fee is hereby granted, provided that the above
8		* copyright notice and this permission notice appear in all copies.
9		*
10		* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11		* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12		* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13		* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14		* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15		* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16		* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17		*/
18
19		/*
20		* This is an open source non-commercial project. Dear PVS-Studio, please check it.
21		* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
22		*/
23
24		#include <config.h>
25
26		#include <sudo_compat.h>
27		#include <sudo_debug.h>
28		#include <sudo_util.h>
29
30		/*
31		* Converts a two-byte hex string to decimal.
32		* Returns a value 0-255 on success or -1 for invalid input.
33		*/
34		int
35		sudo_hexchar_v1(const char s[restrict static 2])
36	858	{
37	858	unsigned char result[2];
38	858	unsigned int i;
39	858	debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL);
40
41	1.45k	for (i = 0; i < 2; i++) {
42	1.25k	switch (s[i]) {
43	291	case '0':
44	291	result[i] = 0;
45	291	break;
46	38	case '1':
47	38	result[i] = 1;
48	38	break;
49	3	case '2':
50	3	result[i] = 2;
51	3	break;
52	5	case '3':
53	5	result[i] = 3;
54	5	break;
55	125	case '4':
56	125	result[i] = 4;
57	125	break;
58	1	case '5':
59	1	result[i] = 5;
60	1	break;
61	15	case '6':
62	15	result[i] = 6;
63	15	break;
64	2	case '7':
65	2	result[i] = 7;
66	2	break;
67	6	case '8':
68	6	result[i] = 8;
69	6	break;
70	0	case '9':
71	0	result[i] = 9;
72	0	break;
73	25	case 'A':
74	28	case 'a':
75	28	result[i] = 10;
76	28	break;
77	1	case 'B':
78	5	case 'b':
79	5	result[i] = 11;
80	5	break;
81	0	case 'C':
82	2	case 'c':
83	2	result[i] = 12;
84	2	break;
85	0	case 'D':
86	0	case 'd':
87	0	result[i] = 13;
88	0	break;
89	0	case 'E':
90	10	case 'e':
91	10	result[i] = 14;
92	10	break;
93	5	case 'F':
94	68	case 'f':
95	68	result[i] = 15;
96	68	break;
97	656	default:
98		/* Invalid input. */
99	656	debug_return_int(-1);
100	1.25k	}
101	1.25k	}
102	202	debug_return_int((result[0] << 4) \| result[1]);
103	202	}