/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.
 */

#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: 2025-10-10 07:09

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		#include <config.h>
20
21		#include <sudo_compat.h>
22		#include <sudo_debug.h>
23		#include <sudo_util.h>
24
25		/*
26		* Converts a two-byte hex string to decimal.
27		* Returns a value 0-255 on success or -1 for invalid input.
28		*/
29		int
30		sudo_hexchar_v1(const char s[restrict static 2])
31	975	{
32	975	unsigned char result[2];
33	975	unsigned int i;
34	975	debug_decl(sudo_hexchar, SUDO_DEBUG_UTIL);
35
36	1.57k	for (i = 0; i < 2; i++) {
37	1.37k	switch (s[i]) {
38	325	case '0':
39	325	result[i] = 0;
40	325	break;
41	41	case '1':
42	41	result[i] = 1;
43	41	break;
44	1	case '2':
45	1	result[i] = 2;
46	1	break;
47	2	case '3':
48	2	result[i] = 3;
49	2	break;
50	130	case '4':
51	130	result[i] = 4;
52	130	break;
53	14	case '5':
54	14	result[i] = 5;
55	14	break;
56	32	case '6':
57	32	result[i] = 6;
58	32	break;
59	0	case '7':
60	0	result[i] = 7;
61	0	break;
62	3	case '8':
63	3	result[i] = 8;
64	3	break;
65	1	case '9':
66	1	result[i] = 9;
67	1	break;
68	23	case 'A':
69	25	case 'a':
70	25	result[i] = 10;
71	25	break;
72	0	case 'B':
73	7	case 'b':
74	7	result[i] = 11;
75	7	break;
76	0	case 'C':
77	1	case 'c':
78	1	result[i] = 12;
79	1	break;
80	0	case 'D':
81	0	case 'd':
82	0	result[i] = 13;
83	0	break;
84	0	case 'E':
85	2	case 'e':
86	2	result[i] = 14;
87	2	break;
88	6	case 'F':
89	17	case 'f':
90	17	result[i] = 15;
91	17	break;
92	773	default:
93		/* Invalid input. */
94	773	debug_return_int(-1);
95	1.37k	}
96	1.37k	}
97	202	debug_return_int((result[0] << 4) \| result[1]);
98	202	}