mirror of https://github.com/cc65/cc65.git
65 lines
3.1 KiB
C
65 lines
3.1 KiB
C
/*****************************************************************************/
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/* */
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/* hexval.c */
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/* */
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/* Convert hex digits to numeric values */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* common */
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#include "chartype.h"
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/* cc65 */
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#include "error.h"
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#include "hexval.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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unsigned HexVal (int C)
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/* Convert a hex digit into a value. The function will emit an error for
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** invalid hex digits.
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*/
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{
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if (!IsXDigit (C)) {
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Error ("Invalid hexadecimal digit: '%c'", C);
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}
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if (IsDigit (C)) {
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return C - '0';
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} else {
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return toupper (C) - 'A' + 10;
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}
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}
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