54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* Simple UTF-8 decoder. Also implements the much simpler ASCII and UTF16
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* input encodings.
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*/
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#ifndef _MF_ENCODING_H_
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#define _MF_ENCODING_H_
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#include "mf_config.h"
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#include <stdint.h>
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/* Type used to represent characters internally. */
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#if MF_ENCODING == MF_ENCODING_ASCII
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typedef char mf_char;
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#else
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typedef uint16_t mf_char;
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#endif
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/* Type used to represent input strings. */
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#if MF_ENCODING == MF_ENCODING_ASCII
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typedef const char * mf_str;
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#elif MF_ENCODING == MF_ENCODING_UTF8
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typedef const char * mf_str;
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#elif MF_ENCODING == MF_ENCODING_UTF16
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typedef const uint16_t * mf_str;
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#elif MF_ENCODING == MF_ENCODING_WCHAR
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#include <stddef.h>
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typedef const wchar_t * mf_str;
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#endif
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/* Returns the next character in the string and advances the pointer.
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* When the string ends, returns 0 and leaves the pointer at the 0 byte.
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*
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* str: Pointer to variable holding current location in string.
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* Initialize it to the start of the string.
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*
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* Returns: The next character, as unicode codepoint.
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*/
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#if MF_ENCODING == MF_ENCODING_UTF8
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MF_EXTERN mf_char mf_getchar(mf_str *str);
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#else
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static mf_char mf_getchar(mf_str *str) { return *(*str)++; }
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#endif
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/* Moves back the pointer to the beginning of the previous character.
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* Be careful not to go beyond the start of the string.
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*/
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#if MF_ENCODING == MF_ENCODING_UTF8
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MF_EXTERN void mf_rewind(mf_str *str);
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#else
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static void mf_rewind(mf_str *str) { (*str)--; }
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#endif
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#endif
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