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      1 GRAPHEME\_NEXT\_LINE\_BREAK\_UTF8(3) - Library Functions Manual
      2 
      3 # NAME
      4 
      5 **grapheme\_next\_line\_break\_utf8** - determine byte-offset to next possible line break
      6 
      7 # SYNOPSIS
      8 
      9 **#include <grapheme.h>**
     10 
     11 *size\_t*  
     12 **grapheme\_next\_line\_break\_utf8**(*const char \*str*, *size\_t len*);
     13 
     14 # DESCRIPTION
     15 
     16 The
     17 **grapheme\_next\_line\_break\_utf8**()
     18 function computes the offset (in bytes) to the next possible line
     19 break (see
     20 libgrapheme(7))
     21 in the UTF-8-encoded string
     22 *str*
     23 of length
     24 *len*.
     25 
     26 If
     27 *len*
     28 is set to
     29 `SIZE_MAX`
     30 (stdint.h is already included by grapheme.h) the string
     31 *str*
     32 is interpreted to be NUL-terminated and processing stops when
     33 a NUL-byte is encountered.
     34 
     35 For non-UTF-8 input
     36 data
     37 grapheme\_next\_line\_break(3)
     38 can be used instead.
     39 
     40 # RETURN VALUES
     41 
     42 The
     43 **grapheme\_next\_line\_break\_utf8**()
     44 function returns the offset (in bytes) to the next possible line
     45 break in
     46 *str*
     47 or 0 if
     48 *str*
     49 is
     50 `NULL`.
     51 
     52 # EXAMPLES
     53 
     54 	/* cc (-static) -o example example.c -lgrapheme */
     55 	#include <grapheme.h>
     56 	#include <stdint.h>
     57 	#include <stdio.h>
     58 	
     59 	int
     60 	main(void)
     61 	{
     62 		/* UTF-8 encoded input */
     63 		char *s = "T\xC3\xABst \xF0\x9F\x91\xA8\xE2\x80\x8D\xF0"
     64 		          "\x9F\x91\xA9\xE2\x80\x8D\xF0\x9F\x91\xA6 \xF0"
     65 		          "\x9F\x87\xBA\xF0\x9F\x87\xB8 \xE0\xA4\xA8\xE0"
     66 		          "\xA5\x80 \xE0\xAE\xA8\xE0\xAE\xBF!";
     67 		size_t ret, len, off;
     68 	
     69 		printf("Input: \"%s\"\n", s);
     70 	
     71 		/* print each possible line with byte-length */
     72 		printf("possible lines in NUL-delimited input:\n");
     73 		for (off = 0; s[off] != '\0'; off += ret) {
     74 			ret = grapheme_next_line_break_utf8(s + off, SIZE_MAX);
     75 			printf("%2zu bytes | %.*s\n", ret, (int)ret, s + off);
     76 		}
     77 		printf("\n");
     78 	
     79 		/* do the same, but this time string is length-delimited */
     80 		len = 17;
     81 		printf("possible lines in input delimited to %zu bytes:\n", len);
     82 		for (off = 0; off < len; off += ret) {
     83 			ret = grapheme_next_line_break_utf8(s + off, len - off);
     84 			printf("%2zu bytes | %.*s\n", ret, (int)ret, s + off);
     85 		}
     86 	
     87 		return 0;
     88 	}
     89 
     90 # SEE ALSO
     91 
     92 grapheme\_next\_line\_break(3),
     93 libgrapheme(7)
     94 
     95 # STANDARDS
     96 
     97 **grapheme\_next\_line\_break\_utf8**()
     98 is compliant with the Unicode 15.0.0 specification.
     99 
    100 # AUTHORS
    101 
    102 Laslo Hunhold ([dev@frign.de](mailto:dev@frign.de))
    103 
    104 suckless.org - 2022-10-06